Tactical Electronics IC-F1020WN-2 VHF TRANSMITTER User Manual

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Date Submitted	2002-06-05 00:00:00
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7D-STR1600-000 5111-1600 om Manual
RECORD 0!‘ CHANGES
Dates of issue for original and each revision of this document are:
Revision —- June 2000 Initial Production Release
LIST OF EFFECTIVE PAGES
Total number of pages in this publication is 63 (excluding schematics,
assembly and mechanical diagrams in appendices) consisting of the following:
i - vi Table of Contents/List of Figures/List of Tables
1 — 47 Document Main Text
A—l - H-l Document Appendices
NOTE: On partial document updates, insert latest changed pages and destroy
superseded pages. ‘
70—STR1600~000 STIR-1600 0&M Manual
TABLE OF CONTENTS
SECTION 1 INTRODUCTION ......1
1.2 Product Deuctiétion . . . .
1.3 Technical Specifications............‘ ....... ' ........................... 2
1.4 Reference Documentation ......... . .......................... . .......... 4
SECTION 2 RECEIVING, INSPECTION AND INSTALLATION . . . . . . . . . . . . . .5
2. 1 Unloading and Unpacking ........ . ........... . ............ . ........... . . 5
2 .2 Receiving Documentation ............................................. . .5
2 .3 Installation and Connection Requirements ......................... . . . . .5
2.4 Connector Description: and signal Definitions .........................
2. 4 . 1 Primary Power.
2 . 4.2 Antenna ......
2 . 4 . 3 Audio/Control .
SECTIONB OPERATION. ...... ..... 10
3.1 Minimum Syeten anuirenents..... .......................... ..10
3.2 Software Installation . .......... . ......................... . .......... 10
3.3 Conventions and File structures ........... . .......................... 10
3.4 Getting Started . . . . .................. .11
3. 4. 1 Radio Interconnect . 1 11
3 . 4 . 2 Power—on Sequence ......... . 11
3. 4.3 Reading the Radio Configuration. . . . . . 12
3.5 Altering the Radio Configuration .......... .13
3 . 5 . 1 Changing Individual Channel Settings . 13
3.5 2 Setting/Changing Model Defaults ........ .13
3.6 Radio Operation ...................................................... 14
SECTION4 MAINTENANCE“ ..... ..... ........ ...15
4.1 MaintenanceConcept........................... ................. . ..... 15
4 .2 Prwentive minivan-nee Requirements . . . . . . .
4 .2 1 Inspection ......
4 . 2 . 2 Cleaning ........
70-STRlBOO—ODO ‘STRPQfiOQ Om Manual
, -, misfit: 033." EIGURES
FIGURE l—,l Product Comparison” . . . , . . . . . , . .
FIGURE 1-2‘ System Overview . < . . ‘ . . ...... . . f, .».' .
FIGURE: 3-1 Radio ‘to‘ PC ,Interconnect Configuramon .
FIGURE _3-2 , Control Spftwars Initial screen . , . . . . ., .
70~STRI600~000 STR-lGOO OGM Manual
’ Lis’T‘fo'fif TABLES
TABLE 2—1~ Primary Power Connector Characteristics... . . . . . . . . . . . . . . . . . . . .6
TABLE 2-2 Antenna Port Connector Characteristics. . . . . ; . . . . . . . . . . . . . . . . ‘ . . . .6
TABLE 2-3 Audio/Control Connector Characteristics. ‘ . . . . . . . . . . . . . . . . . . . . . . . .7
TABLE 2-4 Audio/Control Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . 3
TABLE 2—5 Channel Seliection Control Settings..............................‘..9
SECTION 1 INTRODUCTION
The.TACTICAL ELECTRONICSiUHF/VHF radio product represents a state-of-the-art
comunications 1.1118 providing half—duplex audio to radio frequency (RF)
transmit and receive functions. Consisting of six (5) available models, the
series provides FM transceiver functions in the 140 to 162 MHz and 400 to 512
MHz frequency bands. The design has been tailored towards narrowband data
telemetry applications requiring fast transmit/receive response times with
compact size and high reliability‘
1 . 1 Scope
This manual describes the TACTICAL ELECTRONICS COREORATION
Land Mobile Radios. The manual includes specifications, design description,
installation, and operation instructions along with routine maintenance
requirements ,
1 . 2 Product Description
The radio a modified version of a standard UHF/VHF radio product
produced by ICOM. The VHF versions of the radio incorporate the ICOM IC—F1020
transceiver while the UHF version incorporate the lC—FZOZO. In order to make
the product more applicable for data communications functions, the
product line incorporates a custom front panel as depicted in the following
picture.
IC—F1020/F2020 TACTICAL RADIO
FIGURE 1—1 PRODUCT COMPARISON
The custom front panel replaces the normal operator oriented local
status/control interface and audio interface connector with a single DB-25
connector targeted for computer control. The DB—25 provides both the audio
interface and a strapping capability for frequency select. This feature is
incorporated via a custom printed circuit board (PCB) located within the STR—
1600 front panel known as an External Interface Card lEIC). The following
figure depicts this implementation.
RF Amnnn
Conlml .
Um > External mm ‘
Audio 4+ “grad“ mm
vac
ngflm 0 (EIC)
uo buffer ICOM radio, controller.
circuitry. mm and powsr conditioning
Mel WC
adjunmanls.
and
status/control
at frequency
991an
FIGURE 1—2 SYSTEM OVERVIEW
1 . 3 Technical Specifications
The éechnical capabilities of the TACTICAL radios are summarized in the
following table.
' (FREQUENCY RANGES STIR-1611: 136—155
STE-1612: 146~174
STIR-1621: IND-430
Sim—1622: 450—470
STIR—1623: 470—490
STR—1624: 490-512
Number of Channels 8 preset channels
Prequemy Stability 10.000“ of assigned center frequency from -3D"C to ->60°c («25°C
reference)
FCC Compliance Fcc type certified (FCC 47 CFR 90).
13.6 VDC 1 15% (current 8 13.6 V: transmit 12.5 A, receive 0.7 A)
—_
Reliability 25,000 hr MBTF
70—STR1600-000
sTR-leflu 0&M Manual
“0m
_|_
Spsdflcaflon
Antenna connector
unr female located on rear panel
Audio Interface and
control Connector
05-25 socket on front panel including a channel select lines, audio
in/out, push-to-talk, and programming interface.
Power connector
AMP High Power DC
Channel Spacing
Selectable to either 25 KHZ or 12.5 KHz channel spacing.
RF Output Power
Selectable between 5 and 30 watts (12%) into a VSWR of 2:1 or better.
50 ohms , nominal
output Impedance
Output Protection
Operating into a 10:1 vswx of any phase angle will not damage the
transceiver.
Modulation rm with a rated deviation of +/~ 5 KB: for 25 KHz cnannel spacing and
+/» 2.5 Rx: for 12.5 KHz channel spacing.
Modulation Sensitivity
An 50 mvolt ans audio input signal produces 60% of rated deviation.
Turn—On Time
Within 20 msec (UHF models) or 40 msec (VHF model) of application of
the keying signal, the transceiver reaches 90a of programmed output
power and is capable of transmitting an on frequency signal with a
sthu of 30 an or greater.
_|
Spurious and harmonic
Output
—70 dB below rated power
Audio Input Impedance
10 K Ohm £2051
Transmit Audio Frequency
Response
1_|_
Flat response over the 300—3000 Hz ranger No pre-emphasis.
Minimum Duty cycle
Capable of 30 seconds transmit keying or 25% continuous duty cycle.
utput s/N Ratio
30 dB minimum tully modulated
Spurious Leakage
-57 dBm maximum
1_t_L|_
Selectivity
1_|
70 or minimum for 25 KHz channel spacing and so an min. tor 12.5 kHz
spacing
Intermodulation
65 dB mininimum
Dynamic Range
[_|
LL
with input signals ranging from -100 dBm to 0 dBm, the SINAD at the
receiver is 23 dB mini-mum when receiving a signal modulated with a 1
KHz tone at 60% rated deviation
Sensitivity
J_
0.5 uv 112 dB sINADi minimum
Spuxious and Image
Rejection
70 dB minimum
Transmit to Receive
Recovery Time
30 msec maximum measured from removal to the
transmitter
of keying signal
70-STR1600—000 STE-1600 om Manual
“ Specification
Audio output A 1 m signal at 600 rated deviation produces a 1 v p-p audio output
into a 600 ohm resistive load.
Receive Frequency Flat response over the 300-3000 Hz range. No deemphasis.
Response '
permanent damage.
Approximately 2" high x a" wide x 7~ deep
2 9 m3 5 Hz>300 Hz sinusoidal, 3 axes, continuous
10 9 half sine, 15 msec; 3 exes
-3o°c to +60°c (opening and eeeieee)
Humidity obtainable humidity value versus temperature 1001; 'non»
condensing
Altitude Sea level to 10,000 feet operating and 40,00 feet non—operating
1 . 4 Reference Documentation
The following documents, or the latest revision of these documents, serve as
an addendwn to this document. Users are referred to these documents for
maintenance and design information pertaining to the standard ICOM radio
circuitry.
Service Manual — UHF Land Mobile Radio — IC-FZOZO
(Copyright 1995 by Icom IncJ
Service Manual — VHF Land Mobile Radio ~ IC—FIOZO
(Copyright 1995 by Icom Inc.)
SECTION 2 RECEIVING, INSPECTION AND INSTALLATION
2 . 1 Unloading and Unpacking
NOTE
If shipping carton is damaged upon receipt,
request carrier’s agent be present during unpacking
and inspection of the system.
Upon receipt of the equipment, inspect the shipping container for damage. If
the container or the cushioning material is found damaged, they should be kept
until the contents of the shipment have been verified for completeness and the
equipment has been inspected for mechanical and electrical defects‘ If the
contents are incomplete or if there is a mechanical or electrical defect,
please notify:
TACTICAL ' ELECTRONICS CORPORATION
5589 CAJEPUT COURT
MELBOURNE VILLAGE, FL 32901
(321)253—0845 (phone)
(321)951—4630 (fax)
2.2 Receiving Documentation
Each radio system is shipped with a packing slip. The packing slip should
be carefully checked against the contents of the shipping container.
2.3 Installation and Connection Requirements
The radio's three (3) connectors. These are:
1) Primary Power
2) Antenna
3) Audio/control
After carefully reviewing the connector and signal descriptions below, the
user should establish all connections, making sure that the primary power
input is turned off at the source. Once all interconnections arerin place,
primary power may be applied‘
2.4 Connector Descriptions and Signal Definitions
This section describes the types of connectors used on the sTR—1600 and
provides the definition of the signals associated with each.
2 u 4 . 1 Primary Power
The Primary Power connector is located on the rear of the radio and is
attached to the unit itself via approximately 6 inches of 12 gage wire.
Characteristics of this connector are as indicated in the following table.
TABLE 2-1 PRIMARY POWER CONNECTOR CHARACTERISTICS
9mm
bggiingfiéfu User Supplied) Connector
$2323 (i.e., User Supplied) Pin Part
Connector to Radio Color Coding
2.4.2 Antenna
The Antenna connector is located on the rear of the radio and is mounted
directly to the main housing of the radio. Characteristics of this connector
are as indicated in the following table.
TABLE 2-2 ANTENNA PORT CONNECTOR CHARACTERISTICS
—i
Mating
T -e
(i.e., User Supplied) Connector
Antenna Impedance
Maximum Output Power
SIR—1611: 136—155 MHz
STR—1612: 146—174 MHz
STR—1621: 400—430 MHz
1 Output Frequency Range
‘ SIR-1622: 450—470 MHZ.
STR—1623: 470—490 MHz
STR-1624: 490—512 MHz
2 . 4 . 3 Audio/Control
The Audio/Control connector is located on the front of the\radio r and is
mounted directly to the front panel mold of the radio. Characteristics of
this connector are as indicated in the following table.
TABLE 2-3 AUDIO/CONTROL CONNECTOR CHARACTERISTICS
PARAMETER
Connector Part Number [35-25 Female
Mating (i,e., User Supplied) Connector
Part Number
DB-25 Male
The following table defines the signal contents of all assigned pins on this
connector‘
TABLE 2—4 AUDIO/CONTROL CONNECTOR PIN ASSIGNMENTS
“ DESCRIPTION AND CHARACTERISTICS
Grourd Ground for the external interface side of the EIC card as
well as all externally driven signals or power inputs via
e._// the Audio/Control Connector.
Receive Audio Recovered audio signal output from the radio.
Approximately 1 v p—p into a 600 ohm resistive load for 300
to 3000 Hz outputs. ‘
Transmit Enable Places the radio into transmit mode when low (i.e.,
, ' . grounded) or receive mode when high or floating. Input
will support 20 mA current or 28 volt stand-oft
VCC from the main radio unitl THIS OUTPUT IS PROVIDED AS A
MONITOR POINT ONLY' ! May be utilized to validate that the
STR 00 is in a -ower on state.
Serial Programing Eu l—duplex serial line utilized to program frequencies,
bandwidths and output power selections into the STR—l600.
This interface should only be utilized with the SRI
provided program-ain- interface cablin/software.
Interface
see “Ground” description above.
Toggle control for radio on/off control. Reference the
notes that follow this table for further description.
Ground for the internal interface side of the EIC card as
well as all internal radio logic of the STR~1600. Not. —
do not connect this sign-1 to an nxtnr-nnl ground. Signal
is provided only to be used in conjunction with Power
On/Off Control as described below.
Control signal which when combined with “Channel Select 0"
and “Channel Select 1" forms a 3—bit binary channel
selection control. Input will support 20 mA current or 28
volt stand—off. See table that follows for channel
selection definitions.
Audio signal input to the radio when transmit operation is
active. Signal exhibits a 10 K Ohm input impedance. An 90
mvolt RMS input produces approximately BOY; rated deviation
for in-ut fre-uencies from 300 to 3000 Hz.
See “Ground” description above.
See “Channel select 2" description above.
+13l6 VDC power input to the EIC. This power is utilized
for external interface logic only and is wholly isolated
from the primary input power to the STR—lSOO.
See “Ground” description above.
See “+13.6 VDC" description above.
see “Channel Select 2" description above.
Pins not listed within this table are all defined as no connects.
when the “Power On/Off Control" signal is momentarily connected to “Radio Ground" and
then released, it causes the power on/off state of the radio to toggle. This can be
utilized in conjunction with the “Radio +5 vac" signal to insure the radio is
powered on for operation. Note that radio units will maintain the power on/off
state across removal of the primary power to the radio. As such, users need not
utilize this control signal but may simply always leave the radio in a powered on
state. when delivered from the factory, radio units are left in a power on state.
7D-STR1600>000 STE—1600 0&M Manual
For the channel select lines described above, the following table defines the
control functions of these yinputs‘
TABLE 2—5 CHANNEL SELECTION CONTROL SETTINGS
FRONT PANEL 25 PIN D SIGNAL STATES
DEFINITION
‘ Channel Select 2 Channel Select 1 Channel Select 0
t ' ‘ ‘ Select Chan 1
Select Chan 2
Select Chan 5 ‘
Select Chan 7
Select Chan 8
SECTION 3 OPERATION
Operation of the radio is accomplished by utilizing a special software
program to configure has radio for the proper configuration and than
connecting the system into the target platform for audio data transmission and
reception.
The following sections describe the radio operations from the perspective
of configuring the unit for the proper radio channel characteristics prior to
final system installation.
3.1 Minimum System Requirements
This package requires a PC executing under the windows operating system. The
version of Windows may be Windows 95, windows 98, or Windows 2000. At a
minimum, the system should include:
o 16 Mb RAM (32 Mb recommended)
0 Color monitor (minimum of 600x800 pixel resolution)
0 2 Mb available hard—drive disk space
0 Serial port (COMl: through COM4:)
0 . 3 1/2 “ floppy disk drive
3.2 Software Installation
The control software for the radio is provided on a set of 3 1/2” floppy
disks. The first disk of the set will contain the program “setup.exe".
Executing this program activates a standard windows software installation
process with full instructions as to required user actions. The installation
will create the program “str1600.exe" in the specified install directory.
3.3 Conventions and File Structures
The radio control software supports standard Windows type operation,
including menu based selection processes. Throughout the remaining portions
of this document, a reference such as “select aaaa : bbbb” indicates a Windows
type menu selection process where aaaa is the text name which appears at the
top of the active program screen and bbbb is the submenu item displayed once
the ease menu is selected. Further submenu items are preceded by the same .-
and then the text name of the lower submenu item.
In addition to the STR1600.exe program, the install directory will also
contain the file “prefs.cfg” after the first execution of the program. This
file is utilized to record user settings (e.g., communications port selection)
such that these configurable items can be carried forward across executions of
the program.
The radio control program utilizes Labview, a; software package from
National Instruments. The install directory also contains other support files
associated with the run—time version capability required of Labview for the
control program.
10
3 . 4 Getting started
3 . 4 . 1 Radio Int-rconnect
Before taking any actions from the control program with TACTICAL radio, the
radio must be connected to a primary power source and to the PC via a special
programing interface cable and adapter. The following figure depicts the
required interconnects.
Programmlng DBQ
Interface Comm Pan
Adaptor Conniaor
13.6 VDC
Power STR-1600
Supply Radlo
Prlmary 0925
power AudlolConlro! Programming
Connector Connecmr Interface
Cable
FIGURE 3-1 RADIO To PC INTERCONNECT CONFIGURATION
The 13.6 VDC power supply need only support the radio operation in a quiescent
mode (i.e., < 0.7 A). The power up sequence of the radio versus the PC is not
critical.
The interconnect from the radio to the PC is via an interface cable and
adapter provided with the software (SRI P/N 50—STR1600—200). The cable
consists of a DB9 female connection on one end and an RG45 male connector on
the other end. The D59 end should be plugged into any standard serial
communications port on the PC. DB9 to D525 adapters may be utilized as
required.
The interface adapter accepts the RG45 connection on one side and interfaces
with the STR-1600 female DB-25 front panel connector on the other. The
adapter also includes an LED and a momentary push button switch on the sides
of the plastic housing.
3.4.2 Power-on Sequence
Once the above configuration has been established, the primary power supply
and PC should be powered on and initialized. when the primary power is
activated to the radio . the LED on the side of the programming interface
adapter should illuminate. This indicates that the radio has successfully
powered up in an “ON” condition.
11
If the LED fails to illuminate within two (2) seconds, the user should attempt
to establish an “ON” condition by momentarily activating the push button on
the side of the programing interface adapter and then releasing it. If a
radio has been inadvertently left in an “OFF” condition, this will toggle the
state, which should then illuminate the LED‘ If this action fails to correct
the problem, the user should validate the primary power connection to the
radio and then attempt the “0N”/”0FF” toggle switch again.
3 .4 t 3 Reading the Radio Configuration
Assuming the above process is successful, the user can proceed to activate the
STRlGOO.exe program. This will result in the following sample screen on the
PC's monitor.
r/quR
FIGURE 3—2 CONTROL SOFTWARE INITIAL SCREEN
If this is the first time the program is being utilized or if the operator has
changed the PC’s serial communications port being utilized, the first action
taken by the user should be to establish the correct port selection. This can
be accomplished by selecting Com Port : OOM1:, Com Port : COMZ:, Comm Port :
comm, or Port : COM4:. The port selection will immediately be changed
and the new configuration will be recorded to disk for future executions of
the program
After this action, the user may select Radio : Read Radio. This will cause
the software to interrogate the interconnected radio and then update the
displayed fields. The Serial Number field should reflect the five (5) digit
serial number from the product label on the radio r. gThe model number will
indicate the specific model of the radio and the low and high frequency values
will indicate the valid operational frequency range of this particular model.
The right hand side of the screen indicates the current settings for the eight
(8) preset channel selections of the radio. This includes the channel
12
frequency, bandwidth (i,e., wideband at 25 KHz or narrowband at 12.5 KHz) and
output power level (i.e., 5 Watts or 30 Watts).
3.5 Altering the Radio Configuration
3.5.1 Changing Individual Channel fittings
Once a radio has been read as described above, the channel configuration
fields on the right hand side of the screen may be edited. The frequency
field may be changed via standard text edit methods, or it may be incremented
or decremented via the arrows located at the side of each setting. The
bandwidth and power selections are toggle controls which flip states each time
the user selects the button.
After establishing the changes to all channel settings, the user should select
Radio : Write Radio. The system will again interrogate the radio as to it’s
current settings, modify the channel configurations according to the edited
fields, and then write the new configuration back to the radio.
By interrogating the radio again prior to modifying it’s settings, the
software insures the correct configuration update even if a new radio has been
connected to the PC since the last read radio action. As such, a user may
establish a channel configuration and then write the data to multiple radios
simply by connecting a new radio to the PC and invoking Radio : Write Radio,
The fields on the left hand side of the screen will be updated each time this
action is taken‘
The software does not preclude the operator from establishing invalid
configuration settings, but it does prevent these settings from being written
to the radio. As such, an operator may edit a channel frequency field to
values outside of the indicated range for the current model, but it will
notify the user of the error and abort writing the configuration after the
Radio : Write Radio action is taken. Similarly, channel frequencies not
centered on 25 KHz steps for wideband or 12.5 KHz steps for narrowband will be
cause an abort of the configuration update.
3. 5.2 Setting/ Changing Modal Defaults
The radio control software supports user default settings for each of the
six(6) model types. An operator may establish settings for the eight (8)
channels pertaining to frequency, bandwidth, and output power levels and then
store these as the default settings for that model type. This information is
stored on disk and, as such, the settings will carry across executions of the
control program,
To establish a particular model default, the user must connect a radio of that
model type to the PC. Selecting Radio : Read Radio will update the display to
the information appropriate for that model of radio. The user then may change
the frequency, bandwidth, and power level settings that should be utilized for
the defaults. After carefully checking the configuration, the operator should
select File : Save Current Settings as Default for this Model. After
interrogating the user as to the validity of this action, the system will
replace the previous default settings with the new configuration Each model
type only supports a single default configuration.
13
After having established the desired defaults, any radio can be updated to the
defaults simply by connecting it to the PO and then taking the single action
of selecting Radio : Writ. from Default Settings for this Model. This action
will cause the software to interrogate the radio, determine the model type,
and then write the sppropriat‘éy default settings: for the channel
configurations. At the same time, the display will be updated to reflect the
new information for the radio‘
3 . 6 Radio Ops-ration
Having established the proper channel configuration for the radio, the radio
is now ready for target platform installation. The following operational
considerations should be noted:
1) Radios which are powered up with an active push- to-talk condition will
not operate until the push— —to-talk is removed and stay’ 5 in a non—active
condition for a period of 2 seconds.
2) On initial power up or on any change of the frequency select lines into
the radio, the target frequency setting may take up to 1 second to
obtain.
3) If push—to~talk is active at any time during the 1 second tuning period
outlined in note 2 above, the tuning action will not complete until
push-to—talk is removed and stay’s in a non-active condition for a
period of 2 seconds.
14
SECTION 4 MAINTENANCE
In order to ensure that the radio system is always ready for operation, it
should be checked periodically so that potential defects my be discovered and
corrected before they develop into any serious damage or system failure. A
minimal preventive maintenance program will significantly increase the systems
life span‘
This section describes the necessary preventive maintenance checks and tests
the user can perform to easily identify most defects and problems. Any other
defects or problems discovered during the normal operation of the system
should be noted for future corrective measures.
CAUTION
Stop the operation of the system immediately
if a problem is noted during normal operation,
that can otherwise damage the system.
This section also describes the corrective maintenance checks that can be
performed on the radio system.
4 . 1 Maintenance Concept
The maintenance concept for the radio system is limited to the removal and
replacement of the entire unit.
4.2 Preventive Maintenance Requirements
The following is a recommended timetable for performing preventive maintenance
checks on the radio.
CAUTION
Primary power to the radio must be turned OFF when
performing preventive maintenance on the equipment.
4 . 2 . 1 Inspection
The radio system should be inspected periodically for defects or physical
damage developed during operation. Inspect all the interface cables to and
from the system for cracks, breaks and proper seating with their mating
connectors on the card. Inspect all cables for frayed, broken or damaged
wires. In addition, inspect all-radio connections for accumulation of
dirt, grease, or any foreign material that can cause a non—connection. If a
cable is found damaged or non-repairable, it should be replaced before
operating the system again.
15
70—STR1600—000 5111—1600 cm Manual
Inspection should benperformednat least once'every month. The frequency of
inspection should be increased for units exposed to dusty or heavy particulate
environments.
' 4 . 2 . 2 cleaning
Clean the outside surfaces and areas around the ‘connectors‘vpe dibally.
Clean the surfaces with a clean, soft, lint-free cloth. Clean 'he areas
around the connectors with a soft bristle brush. To remove grease, fungus, or
corrosion, use a cloth dampened with an appropriate electronics cleaning
fluid. Cleaning should be done at least once every ‘month. The frequency of
cleaning should be increased for units exposed to dusty or heavyrparticulate
environments .

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