Park Air Systems B6525MDR Multimode VHF Ground to Air Transceiver User Manual MDR
Park Air Systems Limited Multimode VHF Ground to Air Transceiver MDR
User Manual
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| Document ID | 824675 |
| Application ID | 65EKGfYADXOwekFm2BW2cg== |
| Document Description | User Manual |
| Short Term Confidential | No |
| Permanent Confidential | No |
| Supercede | No |
| Document Type | User Manual |
| Display Format | Adobe Acrobat PDF - pdf |
| Filesize | 152.76kB (1909456 bits) |
| Date Submitted | 2007-08-02 00:00:00 |
| Date Available | 2007-08-02 00:00:00 |
| Creation Date | 2007-06-13 14:59:54 |
| Producing Software | Acrobat Distiller 7.0 (Windows) |
| Document Lastmod | 2007-06-29 09:38:40 |
| Document Title | MDR.book |
| Document Creator | FrameMaker 7.2 |
| Document Author: | DAVES |
Draft 6525 Multimode Digital Radio User Documentation Draft Errata Any errors found in this handbook are promulgated through the Park Air FTP network. Any user can access this information by logging on to: ftp.parkairsystems.com When logged on, select the public (Pub) folder, then the Handbook Errata Sheets folder, and then select the required equipment model. [Adobe Acrobat™ must be loaded on your PC to use this facility] Handbook Title: 6525 Multimode Digital Radio User Documentation Handbook Part Number: 31-3MDR00HB Handbook Version: Draft Date of Issue: June 2007 Published By: Park Air Systems Northfields Market Deeping Peterborough PE6 8UE England Telephone: From UK, 01778 345434 From outside UK, 44 1778 345434 Fax: From UK, 01778 342877 From outside UK, 44 1778 342877 www.parkairsystems.com 31-3MDR00HB Page 2 Draft Health and Safety Warnings A warning is used to indicate possible danger to personnel. Throughout Park Air handbooks, warnings are indicated by the following symbols: WARNING Indicates electrical danger to personnel. WARNING Indicates a hazardous material. WARNING Indicates a non-ionizing radiation hazard. WARNING Indicates a specified danger to personnel. Cautions A caution is used to indicate possible danger to the equipment. Caution Indicates the presence of electrostatic sensitive devices (ESSD). Caution Indicates a specified danger to the equipment. 31-3MDR00HB Page 3 Draft Health and Safety (Continued) Specific Warnings Applicable to the MDR WARNING Dangerous Voltage The instructions given in this documentation involve connecting dangerous voltage to the MDR. Installation must be carried out only by suitably qualified personnel. WARNING Earth Connection This equipment must be earthed. The earth terminal of the ac connector must be used as the safety earth. WARNING Antenna Radiation The antenna used with the MDR must be installed such that the resultant radiated field strength is below 10 W/m² in areas normally accessible to personnel. The RF field strength from the antenna can be predicted from the equation S=1.4PG/4πR2 [Where S = power density; P = power input to antenna; G = antenna gain; R = distance to centre of radiation and 1.4 = multiplication factor for average power based on a modulation index of 90%.] Based on this formula a 2 dBi antenna, the predicted safe distance from the centre of radiation would be approximately 0.75 m for a field strength of 10 W/m2 (1 mW/cm2). This meets the requirements of Health Canada Safety Code 6 for RF and microwave exposed workers. For persons not classed as RF and microwave workers and including the general public the limit is 2 W/m2 (0.2 mW/cm2) which increases the minimum safe distance to 1.7 m. Further information on calculating the field strengths and power levels can be found in Health Canada Safety Code 6 'Limits of Human Exposure to Radiofrequency Electromagnetic Fields in the Frequency Range 3 kHz to 300 GHz', and also in FCC document OET Bulletin 65. WARNING Antenna Radiation Ensure an antenna, or dummy load, is connected before switching on the MDR. There is high RF voltage present at the antenna connector when the radio is keyed. WARNING Beryllium Hazard Although no instructions in this documentation involve removing any equipment covers, users should be aware that the RFPA output transistors contain Beryllium. WARNING Heavy Item During installation an MDR may have to be lifted, possibly to head height, to fit onto telescopic slides. At least two people should be used to lift the equipment. Failure to use sufficient people when lifting equipment can result in personal injury. 31-3MDR00HB Page 4 Draft Disposal This product is covered by the European Directive 2002/96/EC. It must not be disposed of in domestic waste. Disposal should be made using designated collection facilities appointed by the government or local authority in your area. 31-3MDR00HB Page 5 Draft List of Abbreviations amp ac alternating current ACARS aircraft communications, addressing and reporting system AM amplitude modulation BIT built-in test celsius dB decibel dBm power ratio in decibel (dB) referenced to one milliwatt (mW) dc direct current ESD electrostatic sensitive devices Fig figure Hz hertz kg kilogramme kHz kilohertz LCD liquid crystal display metre mA milliamp MDR multimode digital radio MHz megahertz mm millimetre ms milli-second mW milliwatt PA power amplifier ppm parts per million PTT press to transmit RFPA radio frequency power amplifier second volt VDL VHF data link VHF very high frequency VSWR voltage standing wave ratio watt 31-3MDR00HB Page 6 Draft Approvals and Standards 6525 Multimode Digital Radio The equipment is designed to meet the following requirements: RoHS Directive 2002/95/EC WEEE Directive 2002/96/EC ICAO Annex 10 Vol lll Part 1 Chapter 6 EN 301 841-1 Electromagnetic compatibility and Radio spectrum Matters (ERM); VHF air-ground Digital Link (VDL) Mode 2; Technical characteristics and methods of measurement for ground-based equipment; Part 1: Physical layer and MAC sub-layer EN 300 676 Electromagnetic compatibility and Radio spectrum Matters (ERM); Ground-based VHF hand-held, mobile and fixed radio transmitters, receivers and transceivers for the VHF aeronautical mobile service using amplitude modulation; Technical characteristics and methods of measurement. Approvals have been granted against the following: Safety approval to EN60950-1, CAN/CSA-C22.2 No. 60950 and UL 60950 FCC Rules 47CFR Parts 15 and 87 Technical Acceptance under Industry Canada, reference Radio Standard Specification RSS141 CE approval under the R&TTE Directive 1999/5/EC. FCC ID; C8L 6525MDR 0336 ! RoHS 2002/95/EC FCC / Industry Canada Statement This device has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the equipment and the receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the supplier or an experienced radio/TV technician for help. Operation on 8.33 kHz channel spacing is prohibited under the current regulations of Industry Canada and the FCC. 31-3MDR00HB Page 7 Draft Intentionally Blank 31-3MDR00HB Page 8 Draft Contents Page Overview Introduction Operating Modes MDR Applications Hardware Configuration Software Configuration 11 12 12 13 13 13 Specification MDR Operating Characteristics Dimensions and Weight Input Supply Requirement Environmental 15 16 16 16 16 Operation Controls and Indicators Introduction Controls and Indicators Ready Indicator Alarm Indicator Receive Indicator Transmit Indicator Scroll/Select Switch and LCD Connectors Reference Connector Headset/Microphone/Diagnostics Connector Switching On and Setting the Operating Parameters Using the Scroll/Select Switch Screen Protocol Switching On Selecting an Operating Mode Selecting the Operating Frequency Storing and Recalling Frequency Channels Setting Band Edges Setting Parameters Downloading Software Fills 17 18 18 18 18 18 18 18 19 19 19 19 21 21 21 22 23 24 25 27 29 35 Installation Introduction Fuses and Connectors Initial Inspection of the MDR Fitting an MDR into an Equipment Cabinet Rear Panel Interfaces Ethernet Connector Facilities Connector Auxiliary Connector Connecting the Chassis Stud Connecting an Antenna Checking the ac Input Fuse AC Supply Connection 37 38 39 39 40 41 42 43 45 46 46 47 47 31-3MDR00HB Page 9 Draft Contents (continued) Page Maintenance Maintenance Policy Unscheduled Maintenance Scheduled Maintenance Cleaning the Equipment Security of External Connections Checking the MDR’s Internal Reference Frequency Initiating an Interruptive BIT Test Removing and Refitting the Cooling Fan 31-3MDR00HB Page 10 49 50 50 50 50 50 51 52 54 Draft Overview Draft Introduction This documentation describes the Park Air 6525 Multimode Digital Radio (MDR). The MDR is a VHF transceiver operating in the aeronautical frequency band between 118 and 136.975 MHz. The maximum transmit output power is 25 watts. The MDR can be used as a conventional AM-Voice transceiver, or can operate as a subsystem of the Aircraft Communications, Addressing and Reporting System (ACARS) and the VHF Data Link (VDL) air-ground communication systems. Fig 1 6525 Multimode Digital Radio (MDR) Operating Modes Operating modes are software controlled. A 6525 MDR can be loaded with any two of the four available software fills shown in Fig 2. All four software fills are available to download through the user’s network. 6525 MDR VDL Mode 2 AM Analogue ACARS (requires an external modem) AM Digital ACARS (uses modem within the MDR) AM-Voice Fig 2 Operating Modes 31-3MDR00HB Page 12 Overview Draft MDR Applications In addition to operating in a conventional AM-Voice mode, the MDR can operate in two VHF air-ground data link services: ACARS and VDL mode 2. ACARS is a low-speed data link in wide use throughout the world, operating at 2.4 kbits per second using MSK modulation. VDL mode 2 is a higher bandwidth, connection orientated service, operating at 31.5 kbits per second using D8PSK modulation. Hardware Configuration The product model is: 6525 MDR. The part number is: B6525. A hardware configuration label is fixed to the MDR’s rear panel. The label shows the model, part number, serial number and modification status. An example label is shown in Fig 3. PAE 6525 MDR Model: B6525 Part No: 1M2345 S / No: Mod Record: 1 2 3 4 5 6 7 8 9 Park Air Systems Ltd England Fig 3 Hardware Configuration Label Software Configuration The part order number is TBD (customer specific). This number encompasses the hardware part number detailed above, fitted with the software detailed below. Any two of the four available software fills can be stored in the MDR at any one time. A software configuration label, as shown in Fig 4, is fixed to the MDR’s top cover. This label details the part numbers for the four mode software fills, and the permanently installed Ethernet software. Software Configuration Part Order No. TBD (customer specific) Software Mode Part No. Fill * AM Voice TBD (customer specific) Fill * AM Analogue ACARS TBD (customer specific) Fill * AM Digital ACARS TBD (customer specific) Fill * VDL Mode 2 TBD (customer specific) Interface Ethernet TBD (customer specific) *Only 2 are stored in the radio at any one time Fig 4 Software Label 31-3MDR00HB Page 13 Overview Intentionally Blank Draft Specification Draft MDR Operating Characteristics Frequency range Between 118 and 136.975 MHz Number of channels 100 Channel spacing 25 kHz (all modes) 8.33 kHz (Am-Voice mode only) Modulation modes ACARS 13K0A2D VDL Mode 2 14K0G1D AM-Voice (25 kHz) 6K00A3E AM-Voice (8.33 kHz) 5K00A3E Frequency stability Better than 1 ppm within permissible environmental conditions Dimensions and Weight The dimensions and weight of the MDR are: Width 483 mm (19 inches) Depth 450 mm (17.8 inches) Height 88.9 mm (3.5 inches). Weight 12.5 kg (27.5 pounds) Input Supply Requirement ac input supply Between 90 and 264 Vac, 47 to 63 Hz ac power consumption Tx, less than 400 VA (250 VA typical) Rx, less than 70 VA Environmental Temperature range 0 to +40°C operating -20 to +60°C non-operating Ventilation The MDR is cooled by a temperature controlled fan. When the MDR is switched on, the fan runs at full speed for a short period before coming under temperature control Warm up time Less than 30 seconds 31-3MDR00HB Page 16 Specification Draft Operation Draft Controls and Indicators Introduction This topic describes the MDR’s front panel (see Fig 5) controls, indicators and connectors. Fig 5 MDR Front Panel Controls and Indicators Ready Indicator A green indicator that lights when the MDR is ready for use and no BIT faults have been detected. Alarm Indicator A red indicator that either flashes, or lights, when a BIT fault has been detected. BIT indications are classified as either Alerts or Alarms. If an ‘alert’ condition is detected, the Alarm indicator flashes, the Ready indicator remains lit, and the MDR remains operational. A BIT ‘alert’ is indicated if: The MDR’s RF output power has reduced from its setting by more than 1 dB but not more than 3 dB The supply volts falls below 21.6 V The RF PA temperature has exceeded 80oC. Any other BIT condition results in an alarm. When detected, the Alarm indicator lights and the Ready indicator becomes unlit; the MDR cannot be used. When the Alarm indicator flashes, or is lit, the front panel display indicates the nature of the Alert or Alarm Receive Indicator An amber indicator that lights as follows: In AM-Voice mode When a signal above the squelch threshold is received, or when the squelch is defeated. In VDL 2 mode Lights on Sync and remains lit until the end of message. In AM Analogue ACARS mode Lit when a signal is received. In AM Digital ACARS mode Lights on Sync and remains lit until the end of message. Transmit Indicator An amber indicator that lights when the transmit circuit is keyed and producing output power. 31-3MDR00HB Page 18 Operation Draft Scroll/Select Switch and LCD The Scroll/Select switch is used in conjunction with the LCD to select most of the MDR's operational settings. During normal operation, the LCD displays the Main screen. Detailed information regarding the Scroll/Select switch and LCD is given on page 21. Connectors Reference Connector An SMB jack socket that allows a frequency counter to monitor the MDR's reference frequency. This connector is used only for maintenance purposes. The instructions for checking and adjusting the reference frequency are given in the Maintenance topic. Headset/Microphone/Diagnostics Connector A dual purpose connector that allows either a headset/microphone, or a PC, to be connected to the MDR. The connector is a 7-pin self-locking DIN socket; the pin-out is shown in Fig 6 and detailed in Table 1 for the audio connections, and Table 2 for the PC connections. A microphone/headset is used to enable the MDR to be operated from the front panel in AM-Voice mode. Fig 6 Headset/Microphone/Diagnostics Connector Pin-Out Table 1 Headset/Microphone/Diagnostics Connector - Audio Connections Pin Number Input or Output Signal Description Microphone ground 0 V. Microphone PTT Input 0 V to PTT. Sidetone/headset drive Output 0 to 3 V pk-pk. Microphone input Input 2 to 35 mV rms on Passive setting and 8 to 140 mV rms on Active setting to remain in VOGAD range. Ground 0 V. 31-3MDR00HB Page 19 Operation Draft Table 2 Headset/Microphone/Diagnostics Connector - PC Connections Pin Number Input or Output Signal Description Transmit data Output RS232, 115200 baud, 8 data bits, 1 stop bit, no parity, no handshaking. Receive data Input RS232, 115200 baud, 8 data bits, 1 stop bit, no parity, no handshaking. Ground 0 V. Note: PC connections are used for maintenance at Park Air. No instructions in this documentation require the use of this port. 31-3MDR00HB Page 20 Operation Draft Switching On and Setting the Operating Parameters Using the Scroll/Select Switch The Scroll/Select switch (referred to throughout this topic as the ‘Switch’) is used to leave the Main screen and display the Control screen. Further use of the Switch displays various selection menus and allows the required parameters to be set. The switch has three actions: it can be turned clockwise, anticlockwise, or momentarily pushed in. Screen Protocol The following protocol is applicable to all screens described in this document. Main Screen During normal MDR operation, the Main screen, an example of which is shown below, is displayed. M o V D L 0 M H z M O D E Switch Refers to the front panel Scroll/Select switch. The switch is turned clockwise to scroll through fields from left to right, and from top to bottom. The switch is turned anticlockwise to scroll through fields from right to left, and from bottom to top. The switch is pressed to make a selection. Time out If during any setting up procedure the Scroll/Select switch is not operated for 30 seconds, the display returns to the Main screen. If editing any parameter has not been completed, the MDR stays on the original setting. >> Indicates more fields are available other than those currently displayed. To access those fields, turn the switch clockwise through the last displayed field. << Indicates more fields are available other than those currently displayed. To access those fields, turn the switch anti-clockwise through the first displayed field. Back When Back is selected, you are returned to the previous menu. Exit When Exit is selected, you are returned to the Main screen. 31-3MDR00HB Page 21 Operation Draft Switching On The MDR is switched on by setting the rear panel AC Supply switch to On. The LCD should light and show the following displays. When switched on, the MDR initialises which takes approximately five seconds. When the MDR is initialised a Main screen is displayed. Four Main screens are available that reflect the MDR’s four possible operating modes. The screen displayed after switch on reflects the last selected operating mode. Channel (Ch) information is shown only when the MDR operates from a stored channel frequency. A power (Pwr) level indication is shown only when the MDR is keyed. M o A M V o 0 M H z V O C E Main Screen for AM-Voice Mode M o V D L 0 M H z M O D E Main Screen for VDL Mode 2 A volume (Vol) level indication is shown only when the MDR is not keyed. C h M o V o 0 M H z A C A R S A M Main Screen for AM Analogue ACARS M o A M P w 0 M H z A C A R S Main Screen for AM Digital ACARS 31-3MDR00HB Page 22 Operation Draft Selecting an Operating Mode To select the MDR’s operating mode, use the following procedure: With the Main screen displayed, press the Switch to display the Control screen. M o V D L 0 M H z M O D E Main Screen (example shown for VDL Mode 2) Turn the Switch until Settings is highlighted. Then press the Switch to display the Settings screen. C h S e E x > > Control Screen Turn the Switch until the current Mode is highlighted; then press the Switch. Turn the switch to alter the operating mode. When the required mode is displayed, press the Switch. M o M o P o After a delay of approximately 15 seconds the Main screen, applicable to the selected mode, is displayed. E x A M S e V O C E > > Settings Screen The MDR can contain the software fills for two operating modes. If the required operating mode cannot be selected during this procedure, the required fill must be downloaded. See page 35. 31-3MDR00HB Page 23 Operation Draft Selecting the Operating Frequency The MDR’s frequency can be changed in two ways: either from the frequency screen, or by recalling a preset channel. This procedure details using the Frequency screen. Storing and recalling channel frequencies is detailed on page 25. With the Main screen displayed, press the Switch to display the Control screen. M o V D L 0 M H z M O D E Main Screen (example shown for VDL Mode 2) Turn the Switch until Frequency is highlighted. Then press the Switch to display the Frequency screen. C h S e E x > > Control Screen Turn the Switch to highlight the digits to be changed, then press the Switch. Turn the Switch until the required digits are shown, then press the Switch. Repeat until the required frequency is shown, then highlight OK and press the switch. C a 0 M H z O K Frequency Screen Only frequencies that fall between the band edge settings can be selected. Setting Band Edges is described on page 27. 31-3MDR00HB Page 24 Operation Draft Storing and Recalling Frequency Channels As an alternative to setting an individual operating frequency, up to 100 preset frequency channels can be stored in the MDR; any stored channel can be recalled for immediate use. To store a frequency channel: With the Main screen displayed, press the Switch to display the Control screen. C h M o V o 0 M H z A C A R S A M Main Screen (example shown for AM Analogue ACARS) Turn the Switch until Channel is highlighted. Then press the Switch to display the Channel screen. C h S e E x > > Control Screen Turn the Switch to highlight the channel number and press the Switch. Turn the switch to select the required channel number and then press the switch again. C h Turn the Switch to highlight the Frequency digits to be changed, then press the Switch. Turn the Switch until the required digits are shown, then press the Switch. Repeat until the required frequency is shown, then highlight Store and press the switch. B a 0 M H z E x Channel Screen Repeat for other channels as required. Select Back to return to the Control screen, or Exit to return to the Main screen. Only channel frequencies that fall between the band edge settings can be selected. If an attempt is made to store a frequency outside the band edges, an error message is displayed. Setting Band Edges is described on page 27. 31-3MDR00HB Page 25 Operation Draft To recall a previously stored channel: With the Main screen displayed, press the Switch to display the Control screen. C h M o V o 0 M H z A C A R S A M Main Screen (example shown for AM Analogue ACARS) Turn the Switch until Channel is highlighted. Then press the Switch to display the Channel screen. C h S e E x > > Control Screen Turn the Switch to highlight the channel number and press the Switch. Turn the switch to select the required channel number/ frequency and then press the switch. C h Highlight Recall and press the Switch. The MDR now operates on the selected frequency channel. R e B a 0 M H z E x Channel Screen Select Back to return to the Control screen, or Exit to return to the Main screen. 31-3MDR00HB Page 26 Operation Draft Setting Band Edges The frequency range of the MDR is 118 to 136.975 MHz. If required, operation can be limited to either one or two smaller parts of the frequency band by setting the band edges BE1 to BE4. Operation is possible between BE1 and BE2 frequencies, and frequencies between BE3 and BE4. Examples are shown in Table 3. Table 3 Band Edge Values BE1 BE2 BE3 BE4 MDR set so that the full frequency range can be received. 118.000 136.975 118.000 136.975 Example: MDR set to transmit and receive only those frequencies in the range 120 to 130 MHz. 120.000 130.000 120.000 130.000 Example: MDR set to transmit and receive only those frequencies in the ranges 120 to 125 MHz and 130 to 135 MHz. 120.000 125.000 130.000 135.000 To set the band edges: With the Main screen displayed, press the Switch to display the Control screen. M o V D L 0 M H z M O D E Main Screen (example shown for VDL Mode 2) Turn the Switch until Settings is highlighted. Then press the Switch to display the Settings screen. C h S e E x > > Control Screen Turn the Switch clockwise until the Settings screen (second page) is displayed. Highlight Band Edges and press the Switch to display the Band Edge screen. (continued ...) M o M o P o E X V D L M O D E S e > > Settings Screen (First Page) B a R e E x E d S e < < 0 % > > Settings Screen (Second Page) 31-3MDR00HB Page 27 Operation Draft Using the Switch, highlight the band edge values to be altered, pressing the switch after each alteration. When all values are correct, select Exit to return to the Main page. B E 1 0 M H z B E 2 0 M H z B E 3 0 M H z E x > > Band Edge Screen (First Page) Note that band edge frequencies can be set only in increments of 25 kHz. B E 4 B a E x 0 M H z < < Band Edge Screen (First Page) 31-3MDR00HB Page 28 Operation Draft Setting Parameters The MDR’s parameters listed in the following tables can be set by the user. Not all parameters can be set from the MDR’s front panel. The applicable tables are: Analogue ACARS mode, Table 4 Digital ACARS mode, Table 5 VDL mode 2, Table 6 AM-Voice mode, Table 7. Mode specific parameters are set by selecting Mode Settings as follows: With the Main screen displayed, press the Switch to display the Control screen. M o V D L 0 M H z M O D E Main Screen (example shown for VDL Mode 2) Turn the Switch until Settings is highlighted. Then press the Switch to display the Settings screen. C h S e E x > > Control Screen Turn the Switch until Mode Settings is highlighted; then press the Switch. Turn the switch to scroll through and set the applicable parameters. M o M o P o E x A M S e V O C E > > Settings Screen 31-3MDR00HB Page 29 Operation Draft Table 4 Analogue ACARS Functions and Parameters Function Adjustment Range Factory Default Step Size Frequency 118 to 136.975 MHz 118.000 MHz 25 kHz Band edges BE1 and BE3 118 to 136.975 MHz 118.000 MHz 25 kHz Band edges BE2 and BE4 118 to 136.975 MHz 136.975 MHz 25 kHz Channel 1 to 100 – RF power 3 to 25 W 25 W 1W Reference frequency 0 to 100% – 0.4% LCD display backlight time-out 15 to 120 s, On or Off 30 s 15 s Modulation depth 5 to 95% 90% 1% PTT On (key) or Off (dekey) Off – PTT Polarity STD (active low) or INV (active high) STD – Phantom PTT Polarity STD (active low) or INV (active high) STD – PTT reference voltage +14, 0, or -14 V +14 V – Audio line input -20 to +10 dBm -13 dBm 1 dB TX inhibit On or Off Off – Transmit time-out 2 to 510 s, or Off 180 s 2s RF pre-attenuator On or Off Off – Audio line output -20 to +10 dBm -13 dBm 1 dB Loudspeaker/ Headset volume 0 to 100% 30% 5% Initiate BIT interruptive test On or Off – – DHCP On or Off Off – IP address 000.000.000.000 to 255.255.255.255 192.168.0.2 – IP subnet mask 000.000.000.000 to 255.255.255.255 255.255.255.000 – Default gateway address 000.000.000.000 to 255.255.255.255 192.168.0.1 – Control application TCP port number 5001 to 65535 30000 – 31-3MDR00HB Page 30 Operation Draft Table 5 Digital ACARS Functions and Parameters Function Adjustment Range Factory Default Step Size Frequency 118 to 136.975 MHz 118.000 MHz 25 kHz Band edges BE1 and BE3 118 to 136.975 MHz 118.000 MHz 25 kHz Band edges BE2 and BE4 118 to 136.975 MHz 136.975 MHz 25 kHz Channel 1 to 100 – RF power 3 to 25 W 25 W 1W Reference frequency 0 to 100% – 0.4% LCD display backlight time-out 15 to 120 s, On or Off 30 s 15 s Modulation depth 5 to 95% 90% 1% RF pre-attenuator On or Off Off – Loudspeaker/ Headset volume 0 to 100% 30% 5% MAC TM1 (Inter-access delay) 0.5 to 125 ms 75.5 ms 0.5 ms MAC TM2 (Channel busy) 1 to 120 s 60 s 1s MAC TM3 1 to 120 s 20 s 1s MAC p (Persistance) 1/256 to 256/256 50/256 1/256 MAC M1 (maximum number of access attempts) 2 to 9999 10 10 TX enable On or Off Off – Loop back On or Off Off – DHCP On or Off Off – IP address 000.000.000.000 to 255.255.255.255 192.168.0.2 – IP subnet mask 000.000.000.000 to 255.255.255.255 255.255.255.000 – Default gateway address 000.000.000.000 to 255.255.255.255 192.168.0.1 – Control application TCP port number 5001 to 65535 30000 – 31-3MDR00HB Page 31 Operation Draft Table 6 VDL Mode 2 Functions and Parameters Function Adjustment Range Factory Default Step Size Frequency 118 to 136.975 MHz 118.000 MHz 25 kHz Band edges BE1 and BE3 118 to 136.975 MHz 118.000 MHz 25 kHz Band edges BE2 and BE4 118 to 136.975 MHz 136.975 MHz 25 kHz Channel 1 to 100 – RF power 3 to 25 W 25 W 1W Reference frequency 0 to 100% – 0.4% LCD display backlight time-out 15 to 120 s, On or Off 30 s 15 s RF pre-attenuator On or Off Off – MAC TM1 (Inter-access delay) 0.5 to 125 ms 4.5 ms 0.5 ms MAC TM2 (Channel busy) 6 to 120 s 60 s 1s MAC p (Persistance) 1/256 to 256/256 13/256 1/256 MAC M1 (maximum number of access attempts) 1 to 65535 135 Scramble vector 0000 to 7FFF (hex) 0 to 32767 (decimal) 4D4B (hex) 19787 (decimal) TX enable On or Off Off – Loop back On or Off Off – Reed Solomon Decoding On or Off On – DHCP On or Off Off – IP address 000.000.000.000 to 255.255.255.255 192.168.0.2 – IP subnet mask 000.000.000.000 to 255.255.255.255 255.255.255.000 – Default gateway address 000.000.000.000 to 255.255.255.255 192.168.0.1 – Control application TCP port number 5001 to 65535 30000 – 31-3MDR00HB Page 32 Operation Draft Table 7 AM-Voice Functions and Parameters Function Adjustment Range Factory Default Step Size Frequency 118 to 136.975 MHz 118.000 MHz 25 or 8.33 kHz Band edges BE1 and BE3 118 to 136.975 MHz 118.000 MHz 25 kHz Band edges BE2 and BE4 118 to 136.975 MHz 136.975 MHz 25 kHz Front panel step size 25, 8.33 kHz, or both 25 kHz 25 or 8.33 kHz Channel 1 to 100 – Channel spacing 25 or 8.33 kHz 25 kHz Offset carrier 2 offset, ±5 kHz 3 offset, 0 and ±7.5 kHz 4 offset, ±2.5 kHz and ±7.5 kHz RF power 3 to 25 W 25 W 1W Reference frequency 0 to 100% – 0.4% LCD display backlight time-out 15 to 120 s, On or Off 30 s 15 s Modulation depth 5 to 95% 90% 1% VOGAD On or Off On Mute On or Off On PTT On (key) or Off (dekey) Off – Tone keying 2175, 2300 Hz, or Off Off Microphone type Active or passive Passive Keying priority Local-remote, or remote-local Local-remote Local PTT enable Enabled or disabled Enabled Remote PTT enable Enabled or disabled Enabled Remote phantom PTT enable Enabled or disabled Disabled PTT Polarity STD (active low) or INV (active high) STD – Phantom PTT Polarity STD (active low) or INV (active high) STD – PTT reference voltage +14, 0, or -14 V +14 V – Audio line input -20 to +10 dBm -13 dBm 1 dB TX inhibit On or Off Off – Transmit time-out 2 to 510 s, or Off 180 s 2s Audio AGC On or Off On Squelch -110 to -60 dBm (-104 to -54 dBm with RF pre-attenuator selected) -110 dBm 1 dB 31-3MDR00HB Page 33 Operation Draft Table 7 AM-Voice Functions and Parameters (Continued) Function Adjustment Range Factory Default Step Size STD Squelch polarity STD (n/o) or INV (n/c) Squelch noise compensation On or Off On Squelch carrier override On or Off Off Squelch defeat On or Off Off RF pre-attenuator On or Off Off – Audio line output -20 to +10 dBm -13dBm 1 dB Loudspeaker/Headset volume 0 to 100% 30% 5% Self-receive transmit audio on line output On or Off Off Initiate BIT interruptive test On or Off – – DHCP On or Off Off – IP address 000.000.000.000 to 255.255.255.255 192.168.0.2 – IP subnet mask 000.000.000.000 to 255.255.255.255 255.255.255.000 – Default gateway address 000.000.000.000 to 255.255.255.255 192.168.0.1 – Control application TCP port number 5001 to 65535 30000 – 31-3MDR00HB Page 34 Operation Draft Downloading Software Fills Four software fills are available as detailed in Fig 4 on page 13. Any two fills can be stored in the MDR at any one time. All software fills are available on the user’s network and can be downloaded via the MDR’s Ethernet port. 31-3MDR00HB Page 35 Operation Intentionally Blank Installation Draft Introduction WARNING Dangerous Voltage The instructions given in this topic involve connecting dangerous voltage to the MDR. Installation must be carried out only by suitably qualified personnel. WARNING Antenna Radiation The antenna used with the MDR must be installed such that the resultant radiated field strength is below 10 W/m² in areas normally accessible to personnel. The RF field strength from the antenna can be predicted from the equation S=1.4PG/4πR2 [Where S = power density; P = power input to antenna; G = antenna gain; R = distance to centre of radiation and 1.4 = multiplication factor for average power based on a modulation index of 90%.] Based on this formula a 2 dBi antenna, the predicted safe distance from the centre of radiation would be approximately 0.75 m for a field strength of 10 W/m2 (1 mW/cm2). This meets the requirements of Health Canada Safety Code 6 for RF and microwave exposed workers. For persons not classed as RF and microwave workers and including the general public the limit is 2 W/m2 (0.2 mW/cm2) which increases the minimum safe distance to 1.7 m. Further information on calculating the field strengths and power levels can be found in Health Canada Safety Code 6 'Limits of Human Exposure to Radiofrequency Electromagnetic Fields in the Frequency Range 3 kHz to 300 GHz', and also in FCC document OET Bulletin 65. WARNING Antenna Radiation Ensure an antenna, or dummy load, is connected before switching on the MDR. There is high RF voltage present at the antenna connector when the radio is keyed. WARNING Heavy Item During installation an MDR may have to be lifted, possibly to head height, to fit onto telescopic slides. At least two people should be used to lift the equipment. Failure to use sufficient people when lifting equipment can result in personal injury. Caution ESDs The MDR's circuitry contains Electrostatic Sensitive Devices (ESDs). Personnel must be aware of the precautions necessary to prevent damage to such devices. During installation all precautions necessary to prevent ESSD damage must be taken. Caution Unauthorized Modifications Changes or modifications made to this equipment that are not expressly approved by Park Air, or parties authorized by Park Air, could void the user’s authority to operate the equipment. 31-3MDR00HB Page 38 Installation Draft The procedures in this document describe how to install an MDR. The procedures necessary during installation are listed in Table 8. Table 8 Installation Procedures Procedure Reference Perform an initial inspection of the MDR. page 39 Fit the MDR into an equipment cabinet. page 40 Connect the remote signals (as required). page 41 Connect the chassis stud to the cabinet or system earth. page 46 Connect an antenna page 46 Checking the ac input fuse page 47 Connect the ac supply. page 47 Fuses and Connectors Table 9 lists the radio’s supply fuse and the connectors. Some of the connectors (depending on your particular configuration) are required during installation. Table 9 Fuses and Connectors Component Type Park Air Part Number Fuse: AC input fuse T4AH 250V IEC 29E01120108S AC supply connector IEC 20-02030102 Antenna connector N-type plug (straight) or, N-type plug (right-angle) 19-01030301 Ethernet connector RJ45 plug 20K01080100 Facilities connector 25-way D-type plug Plug: 20-01250100 Cover: 20-09250101 Auxiliary connector 9-way D-type plug Plug: 20-01090100 Cover: 20-09090101 Reference connector BNC to SMB 2 metre long lead 17K11000004 Diagnostics connector 7-pin DIN plug to 9-way D-type, radio to PC interconnection lead 17E12600001 Connectors: 19-01030401 Initial Inspection of the MDR On receipt of the MDR from Park Air, remove all transit packaging and check that there is no damage. If damage is evident, contact Park Air immediately and retain the original transit packaging. It is helpful if photographs of any damage can be taken and then forwarded to Park Air in support of any claim. 31-3MDR00HB Page 39 Installation Draft Fitting an MDR into an Equipment Cabinet WARNING Heavy Item During installation an MDR may have to be lifted, possibly to head height, to fit onto telescopic slides. At least two people should be used to lift the equipment. Failure to use sufficient people when lifting equipment can result in personal injury. Caution Mechanical Support It is essential that the chosen mechanical installation provides adequate support along the depth (front to rear) of the unit. The MDR must not be supported by the front panel; doing so can cause damage. The MDR can be installed on telescopic slides, or on fixed runners, within a standard 483 mm (19 inch) equipment rack. M4 tapped holes, each 10 mm deep (see Fig 7) are provided on each side of the equipment to accept the slides. Details of suitable telescopic slides are available from Park Air. When fitted in the rack, the MDR's front panel must be secured to the cabinet’s chassis using four M6 x 16 mm screws and plastic washers. Fig 1 Slide Fittings Front Panel 88.9 29.0 41.7 47.0 152.8 207.5 232.2 378.2 390.9 399 430 450 All measurements in mm Fig 7 Slide Fittings 31-3MDR00HB Page 40 Installation Draft Rear Panel Interfaces The rear panel Ethernet, Facilities and Auxiliary interfaces (Fig 8) are used to connect remote signals as follows: For AM-Voice The line, PTT and squelch inputs and outputs connect via the Facilities interface. For AM Analogue ACARS The analogue ACARS waveform connects between an external modem and the line inputs and outputs via the Facilities interface. For AM Digital ACARS The digital ACARS data connects via the Ethernet interface. For VDL Mode 2 All control information and data to be transmitted and received is transferred via the Facilities (HDLC connections) and Ethernet interfaces. Fig 8 Rear Panel Connectors 31-3MDR00HB Page 41 Installation Draft Ethernet Connector The Ethernet RJ socket connects to a 10/100Base-T Ethernet network. The connector is shown in Fig 9 and the pin-out listed in Table 10. RJ45 Plug Numbering is shown looking from the top of the connector. The top is being viewed with the lever at the bottom. Pin 1 Fig 9 Ethernet Connector Pin-out Table 10 Ethernet Connector Pin-out Pin Signal Name Characteristic TD + Input or Output Output Balanced 100 ohm ±10%, 10/100 Mbps TD – RD + Not connected Not connected RD – Not connected Not connected 31-3MDR00HB Output Balanced 100 ohm differs from the reference by more than 10%, 10/100 Mbps Input Pair with pin 3 Input Page 42 Installation Draft Facilities Connector A 25-way D-type filtered socket providing analogue and HDLC interfaces. The connector is shown in Fig 10 and the pin-out listed in Table 11. A suitable 25-way D-type plug to connect to this interface is listed in Table 9 on page 39. 13 25 14 Fig 10 Facilities Connector Pin-out Table 11 Facilities Connector Pin Signal Name Characteristic Ground 0 V. Line in – Balanced 600 ohm, -20 to +10 dBm. Input or Output Input Phantom Keying: Phantom PTT active when the input differs from the reference by more than 10 V. Reference voltage (common to PTT input on pin 25) is programmable to +14, 0 or -14 V (all ±1 V). Phantom PTT inactive when the input differs from the reference by less than 1 V Maximum input level ±60 V with respect to reference. Input requires at least 1 mA to operate and draws no more that 6 mA. Configurable active high or low. Signal strength Between 0 and 5 V. Output Line out + Balanced 600 ohm, -20 to +10 dBm. Output Ground 0 V. HDLC 0 TX B RS422 differential synchronous data at 128 kbits per second. Output HDLC 0 RX B RS422 differential synchronous data at 128 kbits per second. Input HDLC 0 CL B RS422 differential synchronous data at 128 kbits per second. Output HDLC 1 TX B RS422 differential synchronous data at 128 kbits per second. Output 10 HDLC 1 RX B RS422 differential synchronous data at 128 kbits per second. Input continued ... 31-3MDR00HB Page 43 Installation Draft Table 11 Facilities Connector (Continued) Pin Signal Name Characteristic Input or Output 11 HDLC 1 CL B RS422 differential synchronous data at 128 kbits per second. Output 12 Squelch Solid state relay configurable to be normally open or normally closed. Between +60 and -60 V ac or dc may be applied drawing 100 mA maximum. Output 13 Ground 0 V. 14 Line in + Pair to pin 2. 15 Ground 0 V. 16 Ground 0 V. – 17 Line out – Pair to pin 4. Output 18 HDLC 0 TX A Pair to pin 6. Output 19 HDLC 0 RX A Pair to pin 7. Input 20 HDLC 0 CL A Pair to pin 8. Output 21 HDLC 1 TX A Pair to pin 9. Output 22 HDLC 1 RX A Pair to pin 10. Input 23 HDLC 1 CL A Pair to pin 11. Output 24 Time 0 5 V CMOS Input 25 PTT Active when the input differs from the reference by more than 10 V. Reference voltage (common to phantom PTT input on pin 2) is programmable to be +14, 0 or -14 V (all ±1 V). Input Input Inactive when the input differs from the reference by less than 1 V Maximum input level ±60 V with respect to reference. Input requires at least 1 mA to operate and draws no more that 6 mA. Configurable active high or low. Note: HDLC 0 is used for VDL Mode 2 operation. HDLC 1 is reserved. 31-3MDR00HB Page 44 Installation Draft Auxiliary Connector A 9-way D-type filtered socket for future interface expansion. The connector is shown in Fig 11 and the pin-out listed in Table 12. A suitable 25-way D-type plug to connect to this interface is listed in Table 9 on page 39. Pin-out of Auxiliary connector looking into the mating face of the chassis mounted socket. 5 4 3 2 1 A suitable free socket is detailed in Table 9 on page 39. 9 8 7 6 Fig 11 Auxiliary Connector Pin-out Table 12 Auxiliary Connector Pin-out Pin Signal Name Characteristic Input or Output Ground 0V – Antenna change-over Open collector NPN transistor grounding output, normally open, 200 mA maximum. Output Reserved Open collector NPN transistor grounding output, configurable to be normally open or normally closed, 200 mA maximum. Output Reserved TTL with 4.7 kohm pull-up to 5 V. Configurable to be active high or low. Input Reserved TTL with 4.7 kohm pull-up to 5 V. Configurable to be active high or low. Input Not connected Not connected Not connected dc supply Between 21.6 and 32 Vdc. Fused at 500 mA. Output 31-3MDR00HB Page 45 Installation Draft Connecting the Chassis Stud WARNING Chassis Earth A chassis stud is fitted to the MDR's rear panel. This stud is used to connect the equipment to the equipment rack, or to the user's system earth point. The stud must not be used as the safety earth. In order not to compromise the MDR’s Electromagnetic Compatibility (EMC) the chassis stud, marked and fitted to the rear panel must be connected to the equipment cabinet (if a cabinet is being used) or to the user's system earth point. The connection should be made using a single tri-rated, green-andyellow cable having a cross-sectional area of 2.5 mm2. The cable should have CSA and UL1015 approval, and be connected to the chassis stud through an M6 eyelet (for example, Park Air part number 20-08010103). Failure to comply with this instruction could result in non-compliance with the European Commission EMC Directive 89/336/EEC. Connecting an Antenna WARNING Antenna Radiation The antenna used with the MDR must be installed such that the resultant radiated field strength is below 10 W/m² in areas normally accessible to personnel. The RF field strength from the antenna can be predicted from the equation S=1.4PG/4πR2 [Where S = power density; P = power input to antenna; G = antenna gain; R = distance to centre of radiation and 1.4 = multiplication factor for average power based on a modulation index of 90%.] Based on this formula a 2 dBi antenna, the predicted safe distance from the centre of radiation would be approximately 0.75 m for a field strength of 10 W/m2 (1 mW/cm2). This meets the requirements of Health Canada Safety Code 6 for RF and microwave exposed workers. For persons not classed as RF and microwave workers and including the general public the limit is 2 W/m2 (0.2 mW/cm2) which increases the minimum safe distance to 1.7 m. Further information on calculating the field strengths and power levels can be found in Health Canada Safety Code 6 'Limits of Human Exposure to Radiofrequency Electromagnetic Fields in the Frequency Range 3 kHz to 300 GHz', and also in FCC document OET Bulletin 65. WARNING Antenna Radiation Ensure an antenna, or dummy load, is connected before switching on the MDR. There is high RF voltage present at the antenna connector when the radio is keyed. The MDR uses a common antenna for transmission and reception. The rear panel N-type (female) antenna connector accepts a straight or right-angle N-type plug as listed in Table 9 on page 39. Park Air recommends that RG214 1/2” flexible feeder cable, part number 10-05120610, be used for that part of the feeder circuit that is within a building. 31-3MDR00HB Page 46 Installation Draft Checking the ac Input Fuse Caution Fuse Rating For continued protection against risk of fire, replace only with the same type and rating of fuse. The ac input fuse is located in a pull-out holder that is an integral part of the ac connector. Check that the fuse type is of the correct rating: 100 - 240V T4AH 250V IEC (Park Air part number, 29E01120108S) AC Supply Connection WARNING Dangerous Voltage The equipment is permanently connected to the mains supply when the mains connector is attached. Switching the rear panel Power switch to Off does not isolate all internal circuits from the mains supply. For this reason, a mains isolating switch should be fitted close to, and easily accessible from, the MDR's position. The isolation switch should isolate both live and neutral supplies, be clearly labelled, and adequately rated to protect the equipment. WARNING Earth Connection This equipment must be earthed. The earth terminal of the ac connector should be used as the safety earth. An ac input connector (see Fig 8 and Fig 12) is fitted to the equipment’s rear panel. The cable used to connect between the equipment and the user’s ac power source should be 3-core (to IEC 227) rated 250 Vac at 8 amps, and have a minimum cross-sectional area of 1.0 mm2 per core. Park Air recommends the use of polyvinyl chloride (PVC) insulated cable. The cable must be fitted with the IEC approved equipment connector (Park Air part number 20-02030102) and conform to the following specification: If PVC insulated, be not lighter than ordinary polyvinyl chloride sheathed flexible cord according to IEC publication 227 (designation H05 VV-F, or H05 VVH2-F). If rubber insulated, be of synthetic rubber and not lighter than ordinary tough rubber-sheathed flexible cord according to IEC publication 245 titled ‘Rubber Insulated Cables of Rated Voltage up to and Including 450/750 V (designation H05 RR-F)’. 31-3MDR00HB Page 47 Installation Draft The MDR is a Class 1 equipment. The ac supply cable should have a green-and-yellow protective earthing conductor electrically connected to the protective earthing terminal of the equipment connector and the mains plug. Park Air recommends the ac supply cable is colour coded in accordance with the electrical appliance (colour code) regulations for the UK. That is: The core coloured green-and-yellow must be connected to the terminal in the plug that is marked with the letter E or by the earth symbol or coloured green-and-yellow. The core coloured blue must be connected to the terminal that is marked with the letter N or coloured black. The core coloured brown must be connected to the terminal that is marked with the letter L or coloured red. Fig 12 ac Connector Pin-out 31-3MDR00HB Page 48 Installation Draft Maintenance Draft Maintenance Policy Apart from the scheduled maintenance detailed in this topic, and replacing a faulty cooling fan, the maintenance policy for the MDR is to return faulty units to Park Air. There are no user serviceable parts within the MDR. Breaking the seals on the top and bottom covers voids the MDR’s warranty. Unscheduled Maintenance Unscheduled maintenance is limited to replacing a faulty cooling fan (see page 54). Scheduled Maintenance Park Air recommends that scheduled maintenance be carried out at twelve-monthly intervals. Schedule maintenance comprises: (1) Ensuring the equipment is clean. (2) Ensuring that the external connectors are securely fitted to the MDR. (3) Checking and resetting (if required) the MDR's frequency standard (see page 51). (4) Performing an interruptive BIT test (see page 52). Cleaning the Equipment Remove all dust and dirt from the equipment's exterior using cleaning cloths and a camel hair brush. Clean the front panel indicators and LCD face. Security of External Connections Check all external connections are secure and free from damage. 31-3MDR00HB Page 50 Maintenance Draft Checking the MDR’s Internal Reference Frequency To set the MDR’s internal reference frequency, use the following procedure. Note that references to the switch in the procedure mean the Scroll/Select switch. (1) If the MDR is used in AM-Voice mode with a frequency offset, reset the offset to 0 kHz. (2) Connect a high impedance frequency counter to the front panel Reference connector. (3) From the Main screen, press the switch F r e q u e n c y to display the Control screen. Turn the switch until Settings is highlighted. C h a n n e l Press the switch. S e t t i n g s E x Control Screen (4) Ensure the Settings screen is displayed. Turn the switch until Ref Freq is M o d e highlighted, then press the switch. M o d e P o E X V D L M O D E S e Settings Screen (First Page) (5) (6) (7) With Ref Freq selected turn the switch B a n d E d g e s clockwise or anti-clockwise until the S e t t i n g s frequency counter reads 20.950000 MHz I P ±10 Hz, then press the switch. R e f F r e q 6 7 Turn the switch clockwise until Exit is highlighted, then press the switch. You are returned to the Main screen. E x 0 % Settings Screen (Second Page) Disconnect the frequency counter. 31-3MDR00HB Page 51 Maintenance Draft Initiating an Interruptive BIT Test An interruptive BIT test is available only in AM-Voice and AM analogue ACARS modes. Use the following procedure to initiate an interruptive BIT test from the MDR's front panel. A BIT test cannot be initiated while the MDR is keyed. During an interruptive BIT test, the MDR radiates modulated carrier waves at the set power. Users should therefore obtain the necessary authority before initiating a test. If the test is to be carried out with the antenna disconnected, ensure a load is fitted to the MDR's Antenna connector. In order to test the line input stages, an internally generated 1 kHz tone is injected into the line input circuit. Any other audio present on the line input will cause the test to be inaccurate. Therefore the MDR must not be keyed during the test. (1) From the Main screen, press the switch F r e q u e n c y to display the Control screen. Turn the switch until BIT is highlighted. Press the C h a n n e l switch. S e t t i n g s E x Control Screen (Page 1) (2) Ensure the BIT screen is displayed. Turn the switch until BIT Initiate is highlighted. Press the switch. / W E x C o < < Control Screen (Page 2) E T S u E x > > BIT Screen (continued) 31-3MDR00HB Page 52 Maintenance Draft (3) During the test, which takes approximately two seconds, the Testing screen is displayed. T e T e (4) When the test is complete, either Pass or Fail is displayed. W a P A S S O K T e F A O K 31-3MDR00HB Page 53 Maintenance Draft Removing and Refitting the Cooling Fan The cooling fan is at the rear of the MDR as shown in Fig 13. The part number of the fan is: 69J1208314H Power Connector Finger Guard Fig 13 Cooling Fan Removal Removal Before attempting to remove the fan, ensure that the MDR is isolated from the ac input supply. Then proceed as follows: (1) Disconnect the two-pin power connector. (2) Remove the fan's finger guard. (3) Using an Allen key, inserted through the holes in the fan exposed with the finger guard removed, remove the four M4 x 12 mm caphead Allen screws that secure the fan to the PA module heatsink. (4) Remove the fan from the PA module. Refitting To refit the cooling fan, proceed as follows: (1) Locate the fan in position and using a suitable Allen key inserted through the holes for the fan's finger guard, secure using the four M4 x 12 mm caphead Allen screws. (2) Secure the finger guard to the fan. (3) Connect the 2-pin fan connector to the fan. Ensure the + marked socket mates with the + marked plug on the fan. (4) Re-establish the ac supply. (5) Switch power on at the MDR using the rear mounted Power switch. (6) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit. 31-3MDR00HB Page 54 Maintenance
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