J Communications Co GMRS-1525 Hand Held User Manual
J Communications Co Ltd Hand Held Users Manual
Users Manual
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| Document ID | 97448 |
| Application ID | iG3JBv8Kjyc1I7xAyS+NoQ== |
| Document Description | Users Manual |
| Short Term Confidential | No |
| Permanent Confidential | No |
| Supercede | No |
| Document Type | User Manual |
| Display Format | Adobe Acrobat PDF - pdf |
| Filesize | 94.4kB (1179957 bits) |
| Date Submitted | 2000-04-21 00:00:00 |
| Date Available | 2000-06-08 00:00:00 |
| Creation Date | 2000-04-20 18:57:18 |
| Producing Software | Acrobat 3.0 Scan Plug-in |
| Document Lastmod | 2000-04-20 18:57:37 |
| Document Title | Users Manual |
| Document Creator | Acrobat 3.0 Scan Plug-in |
GMRS—1525 SERVICE MANUAL 2-WAY PORTABLE HANDHELD RADIOS 2000 Januay 27 J—communications co., ltd CONTENT 1. GENERAL 1.1 General 12 Characteristic 1.3 Composition 2. SPECIFICATION 2.1 General Specification 2.2 Electrical Specification 3. OPERATION 3.1 KeyName 3.2 ICONonLCD 3.3 KeyFunctions 3.4 SettingandOperation 4. ADJUSTMENT 4.3 Transmitter Test 44 Receiver 4.5 Rweiver Test 46 Symptoms, check point & Correction 5. DESCRIPTION OF RADIO CIRCUIT 5.1 Frequency Synthesizer 5.2 Receiver 5.3 Transmitter 6. BLOCK DIAGRAM 7. SCHEMATIC 8. COMPONENT PARTLIST 9. ASSEMBLY DRAWING AND PHOTOGRAPH 10. SPEC SHEET 1 1. CHANNEL DATA ,. m.” __.__—_—_...—___ 1A GENERAL 1.1 GENERAL This equipment, GMRS-1525 is called 2 way portable handheld radio. The Mummy range is 4625625 ~ 462.7250MHz, UHF operating Channels for international 2 way radio. 1.2 CHARACTERISTIC a) All active device in this radio is composed of semiconductor and high density 1C, b) To design this radio in compact and weight approximately 1405 with out battery. 0) CPU of this equipment is M38223M4-HP fi'om MITSUBISHI. d) It’s power can operate by use ofalkaline4 cell(l.5V AAA) battery. 1.3 COMPOSITION This radio is composed of following, a) Transceiver (W/Antenna) b) Belt clip 34 OPERATION Name (3 MON/LAMP KEY (5) MODE KEY ®SPEAIG~3R (D ON/OFF & ® EMERGENCY CALL KEY © SCAN/LOCK KEY 3.2 ICONS on LCD 1) Key lock indicator : Indicates that the key lock function is in use. 2) Receive signal indicator : Appears when receiving signal or squelch noise is existing, 3) Monitor indicator : Appears when the CTCSS isn’t in use and squelch is open, 4) Emergency channel indicator : Indicates while receiving an emergency channel. 5) Scan indicator 1 Indicates that scan is enabled. 6) CT CSS indicator : Appears when the CTCSS function is in use. 7) Priority scan indicator : Indicates that the priority scan function is in use. 8) Beep ON/OFF indicator : Appears while key tone is in use. 9) Battery indicator : Indicates the battery status 10) CTCSS readout : Shows the operating CTCSS frequency or code, 11) BCLO (Busy Channel Lock Out) Indicator : Appears to inhibit transmitting whenever there is another conversation is on the channel. 12) vox (Voice Activated Transmit) Indicator : Turning on the power while pressing PTl‘ button activates VOX function. 13) Channel readout : Shows the current channel number, 14) Skip channel indicator : Appears when a non-select scan channel is selected. 3.3 Key Function 1) Volume controls : Turn the power on and adjusts the audio level. 2) m switch : Push and hold to transmit ; release to receive. 3) Monitor / Lamp Key : Press and hold this key for over 2 seconds to enable the receive CTCSS feature. And Push this button momentarily to switch on for ofl‘ the LCD back-lighting. 4) Channel Up/Down key : Push to select the operating channel Push and hold to change the current channel rapidly. 5) Mode (Function) key : Push to select the following fiinction setting mode. Brief press mode 2 1’st press —— CT CSS 2' nd press —- VOX level , 3’ rd press -- Scan skip list 4'th press - Beep ON/OFF, 5' th press -- BCLO ON/OFF 6'th press n 6) Scan/Lockkey : Pushthiskeytomomentarilytoenableordisablethe scan. Press and hold this key for over 2mm to look or unlock keypad. 7)EmergencyChnnneIkey:Pushthiskeytomomentai-ilychangeto emergency charmel (462.6750Mhz)‘ 8) Speaker / Microphone 9)ExternaIDC power-jack : Conneeta4‘8to 6.5VDCpowersoureewiththe cable to the GCH-lZONC wall charger for charging 10) LCD (Liquid Crystal Diw'flY) 11)Transmitindieumr:1jghtredwhiletrmsmitting. 12)Extemal speaker/mic jacks : Connect an optional speaker/mic or headset, ifdesired. Theinternalmicandspeukerwillnotfimctionwhen either is connected. 2) Function display YII'“ l- EMG 1) Key lock indicator : Indicates that the key lock function is in 2) Receive signal indicator 2 Appears when receiving signal 3) Monitor indicator I Appears when any CTCSS isn’ t in use and squelch 4) Emergency Channel indicator 1 Appears when emergency 5) Scan indicator 2 Indicates that scan is enabled. 6) CTCSS indicator: Appears when the CTCSS function is in 7) Priority scan indicator 1 indicates that the priority scan function is 8) Beep ON/OFF indicator 1 Appears while key tone is 9) Battery indicator 1 Indicates the battery 10) CTCSS Frequency readout : Shows the operating CTCSS fi-equency. 11) BCLO (Busy Channel Lock Out) Indicator: Appears to i inhibit transmitting whenever there is another 12) VOX (Voice Activated Transmit) Indicator: Turning on the power while nressiniz P’I‘T button activates VOX function. 13) Skip channel indicator : Appears when a non-select scan channel is selected. BE 14) Channel readout : Shows the current channel number , 3—4. SE'ITHNG AND OPERATION 1) Basic Channel Selection In order to communicate with other GMRS units, both you and the receiving party must be on the same channel GMRSISZS has ISchannels indicated by the large digits on the LCD display panel. Before trying to transmit on the selected channel, you should press the Monitor Button to elwck the activity on that channel Ifsomeone is already on the selected channel, you should try another channel that is clear To change the basic channel, -. In the standby mode, press the Up Button briefly to move to the next higher main channel number. -. Press the Down Button briefly to move to the next lower main channel number 2) Sub Channel Selection CTCSS (Continuous Tone Coded Squelch System) with 38 Sub-Frequency. This feature allows you to utilize a less used channel range (00~ 38) within a main channel. This enables you to connnunicate with another party on the same main Channel using the same sub-code. This helps to avoid congestion on the main channel and filters out unwanted Noise and static. ThereaneSSCTCSS Sub-channelsforeechmainchannel. To change the C‘l’CSS Sub-durum, -. Press the Mode Button until the [con (CTC) appears in the LCD panel. -. Preas the Up Button or Down Button to choose the deaired rub-channel to “set -. The corresponding sub-code fi'equency will be displayed in the lower right cornea ' ' -. Press the FIT Button to confirm your selection, NOTE : To communicate with other PMR units, they must be switched to the same channel mid C TCSS sub—code. To communicate with other GMRS units that do not have sub—codes, switch your unit to the same channel with the sub-code set to OFF 3) Auto Channel Sean List Selection Mode This feature allows you to scan for an active channel and communicate with the party transmitting To access the Auto Channel Scan Skip List menu, -. Press the Mode Button until the Icon (SIG?) blinks on the LCD panel. -. Press the Up Button to choose the desired Scan access channel, or Down Button to choose the desired Sean skip channel. -. Press the FIT Button to confirm your selection. -. "l'heunitwillbeginscamu'ngforanecfivemainchamel. -. To turn ofi'the auto channel scan feature while scanning mode, simply press the SCAN button once. -. When Press the SCAN button ,(SC— ) appears in the LCD panel. - Even when scan appears on LCD, operation such as transmission for this communication is same as one for the normal. -Whenitdoesn’temitanysignelmdyouwanttoTX, presstheP'I'l'switch to return to home channel operation. -. Itwillremmetoscanamomaticallyahouw second afiertheReceiverand transmit is finished. -. At last press the Scan button for simply to leave the scan mode. 4) Priority Scan Channel Sdeetion Mode Thisfeamreallowsyoumonitorone specinlchannel and all scanchannelsat thesametime Ifycu pro-set any priority channel othfl'thanthe cru'rent chamelinuse,thepre-setchannelwillbescanncdevery0.5 secondanrl signals you when a call is received. To access the Priority Scan menu, -. Press the Mode hutton until the (BRIO) icon blinks on the LCD panel. -. Press the Up button or Down button to select the desired channel number You wish to closely monitor. -. Press the FIT button to oonfinuyour selection. -. To turn ofl‘ the Priority Scan feature while scanning mode, simply press the Scan button once. 5) VOX Selection Mode The Voice Activated Transmission (VOX) function allows your voice to activate transmission automatically when the Communicator is used with the optionol hands-flee mic/hend—set (refer to enclosed Accessory Order Form). It also allows hands-flee use when a midhead-set is not being used without having to the FIT button, To access the VOX Selection menu, -. Press the Mode button until the VOX icon blinks and (Vo 01) appears on the LCD Panel. -. Press the Up button or Down button to select fi'om 01 ~ 10 Voice level. -. 01 ~ 10 Level setting determines VOX response sensitivity. -. Press the FIT button to confirm your selection. -. To turn on the VOX feature, press P’I'l‘ button + Power ON. -. To turn off the VOX feature, Power ON again 6) Auto Key lock Selection Mode Thisfeaturepreventsaccidemalchmnelchangeanddisturbancetothe preferred settings of the communicator. Auto Key Lock temporarily disables to Up,Down and PTT button. To access the Auto Key Lock selection menu, -. Press and hold the Scan button for over 2 seconds to Lock or Unlock the Key except HT and On/Ofi' switch. 7) BCDO (Bury Channel Look Out) Selection Mode Thisfenuueinlfibitnmmfitfingwhenevermereisanotberconvemuiouis ontbesamechamel. ToaccesstheBusyChannelLockOutselectionmemx, -.PresstheMode button unfiltheBCLOiconblanksontheDCDpanel -. Presstlle Up button or Down button to select theBCLO ON/OFF option. -. Pressthel’l'l‘button to confirmyour select. 8) Call Ringer Selection Mode This feature provides 5 user selectable call ringer signal to alert you of a callong party. To select your favorite call ringer signal. -, Press Emergency button + Power ON, Appears the (C 01 ) icon blanks on the LCD panel. -‘ Press the Up button or Down button to preview the 5 available signal, -. Press the FIT button to confirm your selection. -, To quickly activate the Call , Simply press PT!” button 2 time click. 9) IOTmme Out Timer) Selection Mode This feature is sometimes necessary or desirable to restrict a single transmission to a specific maximum times. This feature can be usefixl when partiwlarly trying to conserve battery Power. To ms the Time Out Timer selection menu, -, Press Mode button + Power ON . Appears the (T OFF) on the LCD panel -. Press the Up button or Down button to select the 30sec,60sec,180sec or of . -. Press the P11” button to confirm your selection. 10) Emergency Channel Mode The Emergency Channel can be used to special fi'equency (lOChannel : 462.6750sz) within your transceiver. No matter what mode the transceiver is in, the, Emergency Channel always can be Selected quickly. To mess the Emergency Channel mode, -. Press Emergency button . Appears the (EMG) and 10 channel readout on the LCD pand. -. To turn ofi‘ the Emergency Channel feature while Emergency Channel mode, simply pm: the Emergency button once. 4. ADJUSTMENT 4-1. Frequency synthesizer a) Afier connecting the power meter and dummy load(50 ohm), join the antenna connector of TMR—300 with above equipment. b) Check the voltage between T? & GND in digital volt meter. 0) Then set the low channel of TMR-300 the lowest frequency. d) Afier pressed PTT key ofTMR-300, check if the lowest fi'equency of Tx channel to DC 15V in the voltage oftest polnt(D401)4 e) Afier releasing the PTT key of ‘l'MR-300, clwck ifthe highest frequency ofo channel is within DC 1.0V in the voltage oftest point(D401). 4-2. mmmitter a) Connect EUT & measure equipment wording to block diagram below b) Connect DC 640V voltage praet to BUT. c) Connect ‘Powet Meter’ and ‘Dummy Load ( 509 ) d) Adjust Tx frequency according to trimming trimmer VC201. e) Connect AF Oscillator to mic terminal for conform modulation degree, 0 Adjust the frequency of AF Oscillator to 1 kHz and adjust AF level Should be lOOmV 3) Checking Oscilloscope and Modulation Meter. Max deviation should be in 12.5 kHz. 4-3. Msmitter no a) Output Power Test Power(DC 6.0V) should be Max. 2 W(ERP) and in —50% range. b) Audio Response ComectAF oscillatortoltficterminal andthenfirmtheaudio level that doesn’t distortion the wave of Oscilloscope in the frequency range, 300Hzr~ 3kHz. Check the audio level for 300Hz~ 3kl-lz based on fi'equency standard,1kHz. c) Modulation Degree 1m 1) Connect AF oscillatorto the MIC terminal and then adjust the level to 100 Id! 2) Measure the Oscilloscope wave and the point needle“ of Modulation Meter afier pressing P'I‘T key. 3) Sweep gradually the fi'equency of AF Oscilloscope from 300Hz to BkHz. 4) At this time, the point needle ofModulation Meter should beinflj kHz d) Spectrum Test 1) Antenna is 509 and attenuation degree should be 20 dB more. 2) Observe the Spectrum with pressing PTT key. The hannonics should be less -36 ~ -30dBm than carrier. 4-4. Receiver 2) Preparation 1) Adjust the power supply to DC 6.0V 2) Adjust Voltage level to 0.7Vrms(4Q load) afier power on. b) Connection method c) The Conform of Rx sensitivity 1) Adjust 886 to channel fi-equencyl 2) Adjust modulation fi'equency , 11012 to nmdulation degee,1.5kHz. 3) Afier adjusting the fiequency of $86 to channel frequency, RF level sets w —47dBm. d) The Conform of Squelch sentifivity 1) Set the standard channel. 2) In squelch mode, SQ volume VR301 nuns! be armed ooumemlockwise. 3) Afier adjusting $50 to channel frequency, the RF level ofSSG is set On SINAD M dB. « 4-5. Receiver Test a) Rx sensitivity test SSG should be adjusted to 12 dB of Sl'NAD point needle seeing wave of Oscilloscope as SSG sets in lkflz fiequency deviation. At this time , normal RF level is —l 10 ~ -107dBm. b) Audio Distortion 1m 1) SSG should be adjusted like way of point “a)” and RF level sets to -47 dBm. 2) Adjust to 0.7Vrms(4€l load) seeing Audio wave. 3) Read the needle of Distortion Meter (Nomml condition would be less Then 5% distortion) c) Sqneleh Test AfierRFlevelofSSGshouldbesettotheleostlevel,RFlevelshouldbe Gradually increased until speaker makes audio sound. At this point, check RF level (Check if the SlNAD is 8~6 dB). 4—6. Symptoms, Check point & Correction 1) Diagnosis method 1) Cheek each switch to work well. 2) Check voltage of battery. 3) Problem develops fi'om transmitter or receiver? h) Ito-bleshooting 1) Transmitter -. Power key is on condition but does not work, Battery could completely discharge ® Battery cell twist i. © Touch problem come between Battery and Radio. -. Fail to trenmnit. @ Run out ofbattery or charge problem. ® Fault of m key. © Fault “020192029203. -. Transmitter works but frequency is unmatched @ Out oforder in fi'equency synthesizer. (D on oforder in X—tal WWOI) -. Audio does not sound (Tx power and Tx fi'equency are normal) @ Problem of microphone or mic comlector. ® ASP(Audio Signal Processor) 10 U102 problem. -. Txissetwhenswitchison @ Tx switcbm'l') problem. 2) Receiver -. Rx does not work ® Speaker line open problem or connector problem ® Receiver power circuit problem. © Audio amplifier Base band IC mos problem. -. Only noise sound IF IC 0301 problem. ® VCO circuit problem. -. Rx sensitivity is weak @ Antenna mounting problem ® Receiver flout-end circuit problem. © Local oscillation frequency deviation. © FL301.FL302 SAW filter fail. © VCD circuit problem. r. Squelcll does not work @ IF IC USO] problem. (9 Control logic circuit problem. 5. DESCRIPTION OF RADIO CIRCUIT 5-1. Frequency synthesizer Frequency synthesizer consists of VCO,PLL IC(built in PRESCALER) and loop filter. :) VCO VCO is composed of One VCO. Oscillation circuit takes eolpitts circuit using variable Diode. And VCO is composed of D401, L402, C401, 0102, C403 b) I’LL 1C PH, 10 is adjustable IC to produce the wished frequency which VCO provides through loop filter. It in internal counter using 21.25Mhz reference fi'equency to make 6.25kl-Iz as reference Sign]. VCO fi-equency fiomprescaledinputisdividedsigmliscomparedwithkefirmsimal phase in phase comparator Built-in chrger pump changes voltage (until two signals are in phase) and charged voltage supplies VCO through loop filter . to produce the desired fi-equency. . FrequemydatussociatedwithchannelgoestoPLLleyCPUthrough CLOCK,DATA PLLIC enableebystrobelineofCPU. e) Loop Filter Loop firm is composed ofR217, R218, R219,C3, 0240, 0241 and changes pulsefi'ompirflnoDC . Andeliminsteslnrmonicoomponentinpulse. It helps VCO oscillme clearly as DC volmgo is supplied into Varicap. S-LReceiver Thisiscomposed ofDual Conversion SuperHeterodyne. FirstIFis 21.7Mliz. localoseillatorfi-equencyislowerin l’stlFthmefiequency. It is called low side injection Second IF is450kl-lz‘ Z’nd local oscillator Frequency comes to 21.25Ml-Iz. a) Rx I T: Conversion Circuit Rx signal goes to Rx / Tx conversion circuit through FIXED antenna connector, low pass filter (L201,L202,L203,C210,C202,C203,C204) and receiver resonance circuit composed ofL204,C2064 When transmitting, Voltage through R209,L211,D201 supplies,D202 of receive input is short and Tx is on condition, When PIN diode is 05 in condition of Rx, C301,C302 L301 resonate serially and make impedance matehing at receiver bandpass filter.(FL301,FL302) b) Front End Front—end has QZOI to provide a high sensitivity and low noise feature. It employs SAW filter as band pass filter to eliminate image frequency and to produce enough pass band by Q30| input and outputs c) Mixer Mixer has mo gate 3SK228(Q302) to feature high ,low noise quality. It has RF signal through Q301 and FL302,C306 and RF signal from Local Oscillator mixed . It develops I’st IF 2L7MHz. I’st IF goes to 1’st IF amplifier Q303 base through X-tal filter FL303. If of mixing signals is selected and taken into X-tal filter. Output impedance of mixer is direct matclwd with input impedance of X-tal filter. Matching of filter satisfies pass bandwidth of filter, ripple elimination with in pass band, and attenuation characteristic of stop band. X—tal filter is composed of two pole monolithic X-tal filter, 8kI-Iz of IF Bandwidth. R307 isused as impedance matching with l’st IF Amp 0303. d) [F AMP and Detection 1’st IF AMP Q303 supplies IF IC (IJ301) mixer input pinl6 through output resistor R308 and C311 to nwd gain in insertion loss ofX-tal filter and last stage circuit. Multi-use IF IC makes up ofmixer IF AMP. 2’nd local frequency enter to IF IC pinl. It suppliesmixerofinternnlIFIC. Mixeroutputole ICthroughpinS passes 450kHz ceramic filter, supplies 2’nd IF amplifier and limits. Alter 2’nd IF AMP has a process of enough gain and AM rejection, it comes to quadrature detection. Demodulated audio signal by X30] is amplified and comes out to pin9. Detected audio signal through R313, VRl and input in audio amp. Audio 1C UlOS through R149. e) Squelcb Circuit Noise component of detected outputs has amplification squelch threshold ls controlled by Resistor R310,R312,VR301. t) Audio Amplifier Demodulated audio signal enters to pin3 of AF IC (0105) Alter above signal amplifies in 0105 pin1 and pins through 01403150. It comes out to pin5 then, it reaches at speaker. 54. mnsmitt When Tx develops with pressing PTT switch, VCO output amplifies through Q204,Q203,Q202,Q201 transmits by antenna through low pass filter. Tx RF signal produced fi'om Tx VCO is amplified by Bufi’er Q204, Prodriver Q203, Driver Q202 through C212 and entered Q201 Power Transistor input terminal with final amplification. Alter this stage, the signal is emitted at antenna though 509 matching circuit to low pass filter (maximums 0201,C202,C203,C204) to eliminate harmonic. a) Audio Modulation and Audio Amplification Audio signal prodmed by external or internal microphone, limits amplifieetion, low pass filter by IC mm. Max. Frequency modulation deviation is adjusted by 1027,sz keeps noise ‘ and audio fi'om entering to VCO n time of Tm Audio modulation and Audio Amplification has diameteristic of 6 dB/OCT pro—emphas's by U102.
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