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RELM RMU800A Service Manual

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CONTENTS
General........................................................................................................1
Radio Overview..............................................................................................2
Software Specification....................................................................................5
Circuit Description........................................................................................79
Semiconductor Data.....................................................................................84
Component Description................................................................................91
Part List 1....................................................................................................92
Exploded View............................................................................................117
Part List 2...................................................................................................118
Disassembly and Reassembly for Repair........................................................120
Remote Kit Installation (Optional)..................................................................123
Packing......................................................................................................125
Adjustment.................................................................................................126
Adjustment Description...............................................................................133
Terminal Function.......................................................................................139
Display Unit................................................................................................145
Tx-Rx Unit..................................................................................................149
VCO..........................................................................................................153
Schematic Diagram.....................................................................................157
Block Diagram...........................................................................................162
Specifications...........................................................................................163

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  • Page 1: Table Of Contents

    CONTENTS General…………………………………………………………………………………………..1 Radio Overview………………………………………………………………………….………2 Software Specification…………………………………………………………………………5 Circuit Description………………………………………………..…………………………..79 Semiconductor Data………………………………………………………………………….84 Component Description…………………………………………..…………………………91 Part List 1…………………………………………………………………………….…………92 Exploded View…………………………………………………………………..……………117 Part List 2…………………………………………………………………………..………….118 Disassembly and Reassembly for Repair………………………………………………..120 Remote Kit Installation (Optional)…………………………………………………….…..123 Packing……………………………………………………………...…………………………125 Adjustment……………………………………………………………………...…………….126 Adjustment Description……………………………………………………………….……133 Terminal Function……………………………………………………………………………139 Display Unit…………………………………………………………………………………...145 Tx-Rx Unit……………………………………………………………………………………..149 VCO…………………………………………………………………………………………….153 Schematic Diagram………………………………………………………………………….157 Block Diagram…………………………………………………………………………….…162 Specifications…………………………………………………………….…………………163...

  • Page 2: General

    RMU800A SERVICE MANUAL General Manual Scope This manual is intended for use by experienced technicians familiar with similar types of communication equipment. It contains all service information required for the equipment and is current as of the publication date. Precautions Safety Standards ●...

  • Page 3: Radio Overview

    RMU800A SERVICE MANUAL Radio Overview Front Panel View ① Power Press the power button to switch the radio on/off. ② Selector Knob Volume Up/Down, Channel Up/Down, Zone Up/Down features can be programmed to this knob (Set by your dealer). Turn the knob clockwise to adjust upwards and counter-clockwise to adjust downwards.

  • Page 4: Lcd Display

    RMU800A SERVICE MANUAL Microphone LCD Display Indicator Description 1. Display zone / channel number. 2. Display zone / channel label (set by your dealer, up to 12 alphanumeric characters). 3. Display channel Frequency 4. Display the preprogrammed function 1. Display zone / channel number.
  • Page 5 ① Antenna Connector Used to connect external antenna. ② Power input Connector Adopt Relm-authorized DC power cable and 13.6 V input AC power. ③ Speaker Jack Used to connect external speaker and only available for the plug of 3.5 mm.

  • Page 6: Software Specification

    RMU800A SERVICE MANUAL Software Specification Radio Modes 1. Frame of Radio Modes Conventional Mode User Mode User Set Mode Firmware Download PC Mode Clone Mode Wired Clone Mode Wireless Clone Mode Dealer Mode Channel Set Mode Zone Information Mode Function Set Mode...
  • Page 7 RMU800A SERVICE MANUAL 2. Keypad Entry for Mode Startup Display/Sub MODE Main Menu Operation Remarks Menu Conventional Turn on the power to enter ------------------------- Mode Conventional Mode Function Set Refer to Appendix 1 “Character PowerOn Text USER Input” MODE While holding down [PF1]...
  • Page 8 RMU800A SERVICE MANUAL --------------------------- Test Mode TEST & --------------------------- While holding down [PF2] ADJUST ADJUST MODE key, turn on the power MODE --------------------------- Model Set Mode --------------------------- While holding down [PF3] Firmware Version Display Mode key, turn on the power...
  • Page 9 RMU800A SERVICE MANUAL Function Set Select submenu “Function Set”, then press [PF6] to enter Function Set Mode. Function Name Settings Display Remarks Home Off Home Off Home 1 On Home 1 On Home 2 On Home 2 On Home Channel...
  • Page 10 RMU800A SERVICE MANUAL UST Code Select submenu “UST Code”, press [PF6] to enter UST Code Mode. Function Name Settings Display Remarks 1-32 UST Code No. UST 32 ASCII CODE Name UST Code Name -------- No input CTCSS CTCSS 67.0 (EIA standard) 67.0-254.1Hz...
  • Page 11 RMU800A SERVICE MANUAL CTCSS CTCSS 67.0 (EIA standard) 67.0-254.1Hz CTCSS 254.1 CTCSS CTCSS 67.0* (0.1Hz step) 67.0-254.1Hz CTCSS 254.1* CDCSS (standard) CDCSS 023N [PF5]: Off/CTCSS/CDCSS 023-754 TX Signalling CDCSS 754N [PF4]: standard/step mode [PF3]: CDCSS/ reverse CDCSS CDCSS (1step) CDCSS 000N*...
  • Page 12 RMU800A SERVICE MANUAL Key Assignment Select submenu “Key Assign”, press [PF6] to program the programmable function key PF1-PF6. Settings Display Remarks None PF1 Off VOL Up Volume up PF1 VOL Up VOL Down Volume down PF1 VOL Down CH Up...
  • Page 13 RMU800A SERVICE MANUAL Scan Scan PF1 Scan Add/Del in non-scan mode Add/Del Nuisance channel temp.Del PF1 Add/Del Priority ch temp. del Reverse Reverse frequency PF1 Reverse Talk Around Talkaround PF1 TA SEL SQL Select SQL PF1 SelSQL Home CH Home channel...
  • Page 14 RMU800A SERVICE MANUAL None PF2 Off VOL Up Volume up PF2 VOL Up VOL Down Volume down PF2 VOL Down CH Up Channel up PF2 CH Up CH Down Channel down PF2 CH Down Zone Up Zone up PF2 Zone Up...
  • Page 15 RMU800A SERVICE MANUAL Reverse Reverse frequency PF2 Reverse Talk Around Talkaround PF2 TA Sel SQL Select SQL PF2 SelSQL Home CH Home channel PF2 HomeCH Public Address Public address PF2 PA Horn Alert Horn alert PF2Horn Alert LCD BackLight LCD backlight...
  • Page 16 RMU800A SERVICE MANUAL MONI A: Moni A PF3 MoniA Monitor Unmute-Momentary MONI B: Moni B PF3 MoniB Monitor Unmute-Toggle MONI C: Moni C PF3 MoniC Carrier Squelch-Momentary MONI D: Moni D PF3 MoniD Carrier Squelch-Toggle Display Label Display channel label...
  • Page 17 RMU800A SERVICE MANUAL Scramble Scrambler PF3 Scramble Compander Compander PF3 Compande AUX A AUXA port output control PF3 AUX A [PF3] AUX B AUXB port output control PF3 AUX B Send GPS Send GPS PF3 Send GPS Emergency Call Emergency call...
  • Page 18 RMU800A SERVICE MANUAL Ch No./ch label/zone No./zone Display Mode PF4 DMode label/RX Freq. User Selectable Tone Tone 01-32(CTCSS/CDCSS) PF4 UserTone Sel 2Tone Select 2-Tone encode PF4 Sel2Tone Sel 5Tone Select 5-Tone encode PF4 Sel5Tone Sel HDC PF4 SelHDC Tx Power...
  • Page 19 RMU800A SERVICE MANUAL Message Message PF4 Message None PF5 Off VOL Up Volume up PF5 VOL Up VOL Down Volume down PF5 VOL Down CH Up Channel up PF5 CH Up CH Down Channel down PF5 CH Down Zone Up...
  • Page 20 RMU800A SERVICE MANUAL Add/Del as not in scan status Nuisance channel temp.Del Add/Del PF5 Add/Del Priority ch temp. del Reverse Reverse frequency PF5 Reverse Talk Around Talkaround PF5 TA Sel SQL Select SQL PF5 SelSQL Home CH Home channel PF5 HomeCH...
  • Page 21 RMU800A SERVICE MANUAL Zone Up [Default] PF6 Zone Up Zone up Zone Down PF6 Zone Down Zone down MONI A: Moni A PF6 MoniA Monitor Unmute-Momentary MONI B: Moni B PF6 MoniB Monitor Unmute-Toggle MONI C: Moni C PF6 MoniC...
  • Page 22 RMU800A SERVICE MANUAL Horn Alert PF6Horn Alert Horn alert LCD BackLight PF6 LCD Light LCD backlight Scramble PF6 Scramble Scrambler Compander Compander PF6 Compande [PF6] AUX A AUXA port output control PF6 AUX A AUX B AUXB port output control...
  • Page 23 RMU800A SERVICE MANUAL 5. Firmware Version Display Mode Turn the power on while holding down [PF3] to enter Firmware Version Display Mode. Firmware version and Firmware checksum will be displayed on the LCD. Release [PF3] to enter User Mode. 6. PC Mode Connect the radio with a PC by programming cable.
  • Page 24 RMU800A SERVICE MANUAL Note: Only the same models can be cloned together. Wireless Clone Mode (1) Turn on the source radio while holding down [PF5] simultaneously, the radio enters Clone Mode with “CLONE” on the LCD, or enters User Mode if Clone Mode is set OFF by your dealer.
  • Page 25 RMU800A SERVICE MANUAL 8. Dealer Mode (1) Turn the power on while holding down [PF6], the radio enters Dealer Mode after inputting correct data password (if Data Password is set). The first activated mode option is displayed. When all mode options are prohibited, the radio enters Mode Information Mode after a correct mode-info password (if mode-info Password is set) is entered.
  • Page 26 R 100.00000 Selector Knob: change at step 500 0 frequency R 400.00000 2.5K/5.0K/6.25K/1M [PF4]: 2.5K/5.0K/6.25K/1M step 100.0000-550.0000MHz RX Frequency 625 0 Step 2.5K: only for RMU800A R 400.00000 VHF(<200MHz) R 550.00000 [PF5]: On/Blank Blank --------------- CTCSS (EIA standard) CTCSS 67.0 67.0-254.1Hz CTCSS 254.1...
  • Page 27 T 100.00000 Selector Knob: change at step 500 0 frequency 2.5K/5.0K/6.25K/1M T 400.00000 [PF4]: 2.5K/5.0K/6.25K/1M step TX Frequency 100.0000-550.0000MHz 625 0 Step 2.5K: only for RMU800A T 400.00000 VHF(<200MHz) T 550.00000 Blank [PF5]: On/Blank --------------- CTCSS (EIA standard) CTCSS 67.0 67.0-254.1Hz CTCSS 254.1...
  • Page 28 RMU800A SERVICE MANUAL Option Off Default DTMF DTMF 2-Tone 2 Tone Optional Signalling 5-Tone 5 Tone HDC2400 HDC2400 HDC1200 HDC1200 Default BCL (Busy CTCSS/CDCSS CTCSS/CDCSS Channel Lockout) Opt Signalling Opt Signal Carrier Only Carrier Only Default Shift Off Clock Shift...
  • Page 29 RMU800A SERVICE MANUAL Name 12 characters maximum PHILLPOTTS PHILLPOTTS Current input position is 15 Channel Name indicated by cursor Name Refer to Appendix 1 “Character ----------------- ----------------- Input” None Decode None Appears when 2-Tone is 2-Tone Decode selected Decode 1...
  • Page 30 RMU800A SERVICE MANUAL Dealer Mode 2: Zone Information Select menu “Zone Inform”, then press [PF6] to enter Zone Set Mode. Function Display Remarks Setting Selector Knob: select a zone Zone Select Zone 100 Only existing zone can be set. Name...
  • Page 31 RMU800A SERVICE MANUAL Default Reset Off TOT Reset Time 1-15s Reset 1s/1Step Reset 15 Signal OR Default Signalling Control Signal AND Transpond On Default ClearToTranspond TranspondOff Home Default Zone Home Channel 1 1-512 Channel Home Channel Display “END” indicating the end...
  • Page 32 RMU800A SERVICE MANUAL 1. Select submenu “Function 1”, then press [PF6] to enter. Function Setting Display Remarks SQL 0 Step: 1 Squelch Level SQL 5 Default SQL 9 Not decode ctcss/cdtcc during off Not decode hook status, it works as carrier...
  • Page 33 RMU800A SERVICE MANUAL RollOver Off Roll Over Display rolls over as over 12 characters RollOver On Display “END” indicating the end of menu options 2. Select submenu “Function 2”, then press [PF6] to enter. Function Setting Display Remarks LCD ZoneNum...
  • Page 34 RMU800A SERVICE MANUAL Ignition Off Ignition Sense Ignition On 00-59Min 00Hour 00Min Step 1Min Adjust timer: Ignition Sense 00Hour 59Min 0Hour, 0Min-24Hour, 00Min Power off Timer PF5: 1MIN/1HOUR step change 00-24Hour 00Hour 00Min Step 1Hour 24Hour 00Min Display “END” indicating the end of menu option 3.
  • Page 35 RMU800A SERVICE MANUAL VolumeMinOff Volume Min VolumeMin 1 1-64 Step 1 VolumeMin 64 VolumeMin 64 64-127 Volume Max VolumeMin 127 Step 1 Display “END” indicating the end of menu option 4. Select submenu “Alert Tone”, then press [PF6] to enter.
  • Page 36 RMU800A SERVICE MANUAL Dura No.1 0-2550ms Step 10ms Dura Tone Duration No.1 2550ms No. 1-14 Step 1 Dura No.14 0-2550ms Step 10ms Dura No.14 2550ms Display “END” indicating the end of menu option 5. Select submenu “AUX Inform”, then press [PF6] to enter.
  • Page 37 RMU800A SERVICE MANUAL Function Setting Display Remarks AUX 1 None None AUX 1 External PTT Input External PTT AUX 1 Data PTT Input Data PTT AUX 1 Speaker Mute Input Speaker Mute AUX 1 External Monitor Input ExternalMoni AUX 1...
  • Page 38 RMU800A SERVICE MANUAL Function Setting Display Remarks AUX 2 None None AUX 2 External PTT Input External PTT AUX 1 Data PTT Input Data PTT AUX 2 Speaker Mute Input Speaker Mute AUX 2 External Monitor Input ExternalMoni AUX 2...
  • Page 39 RMU800A SERVICE MANUAL Function Setting Display Remarks AUX 3 None None AUX 3 Input External PTT External PTT AUX 1 Input Data PTT Data PTT AUX 3 Input Speaker Mute Speaker Mute AUX 3 Input External Monitor ExternalMoni AUX 3...
  • Page 40 RMU800A SERVICE MANUAL Function Setting Display Remarks AUX 4 None None AUX 4 Input External PTT External PTT AUX 1 Input Data PTT Data PTT AUX 4 Input Speaker Mute Speaker Mute AUX 4 Input External Monitor ExternalMoni AUX 4...
  • Page 41 RMU800A SERVICE MANUAL Function Setting Display Remarks AUX 5 None None AUX 5 Input External PTT External PTT AUX 5 Input Data PTT Data PTT AUX 5 Input Speaker Mute Speaker Mute AUX 5 Input External Monitor ExternalMoni AUX 5...
  • Page 42 RMU800A SERVICE MANUAL Function Setting Display Remarks AUX 6 None None AUX 6 Input External PTT External PTT AUX 1 Input Data PTT Data PTT AUX 6 Input Speaker Mute Speaker Mute AUX 6 Input External Monitor ExternalMoni AUX 6...
  • Page 43 RMU800A SERVICE MANUAL Function Setting Display Remarks AUX 7 None None AUX 7 Input External PTT External PTT AUX 1 Input Data PTT Data PTT AUX 7 Speaker Mute Input Speaker Mute AUX 7 Input External Monitor ExternalMoni AUX 7...
  • Page 44 RMU800A SERVICE MANUAL Dealer Mode 4: Scan Information Select menu “Scan Inform”, then press [PF6] to enter Scan Information Mode. The menu options are shown as follows: Sub Menu Menu Item Scan Set ZoneScanList 1. Select submenu “Scan Set”, then press [PF6] to enter.
  • Page 45 RMU800A SERVICE MANUAL Ch: Off, 1-512 PRICH1 Off Selector Knob: change a channel Priority Channel1 Zone or zone (default CH) [PF5]: channel/zone Channel PRICH1 [PF4]: Priority CH On/Off PRICH2 Off Ch: Off,1-512 Selector Knob: change a channel Priority Channel 2...
  • Page 46 RMU800A SERVICE MANUAL Scan Default Last used (RX) Revert Call Scan Last used (TX) Revert Used Scan Selected Revert SEL Selected + Scan TalkBack SEL TalkBack Revert Channel Scan Priority 1 Revert PRIO1 Priority 1 Scan +TalkBack P1 TalkBack Scan...
  • Page 47 RMU800A SERVICE MANUAL 2. Select submenu “ZoneScan List”, then press [PF6] to enter. Function Setting Display Remarks Selector Knob：select zone 1-256 Select a Zone Zone 100 Only existing zone can be set. [PF6]: enter the second item List Enable Zone Scan List...
  • Page 48 RMU800A SERVICE MANUAL First digit = first digit time + digit time 100ms Default 100ms 2 First Digit Time 500ms 500ms 1000ms 10ms/1Step 1000ms First: Max (first digit time,*and# time) + digit time Not first: * and # time + digit time...
  • Page 49 RMU800A SERVICE MANUAL DTMF D Code DKey D-Code DTMF D Key Assignment Pause1-16s DKeyPause 1 DTMF DkeyPause 16 DTM F Side Tone Off SideTone Off DTMF Side Tone DTM F Side Tone On SideTone On Auto Dial Off AutoDial Off...
  • Page 50 RMU800A SERVICE MANUAL 2. Select submenu "DTMF Decode", then press [PF6] to enter. Function Setting Remarks Display 12345678 12345678 1 Primary Code ABCDEF12 ABCDEF12 12345678 12345678 2 Secondary Code ABCDEF12 ABCDEF12 Auto RstTime Off Auto 3 Auto Reset Time RstTime 1S...
  • Page 51 RMU800A SERVICE MANUAL 3. Select submenu “AutoDialList”, then press [PF6] to enter. Function Setting Display Remarks 1-32 AutoDial Auto Dial No. Step 1 AutoDial 32 Name ASCII CODE AutoDial Auto Dial Name Name No input ----------- Code It will be scrolled as >=12...
  • Page 52 RMU800A SERVICE MANUAL Dealer Mode 6: 2-Tone Set Select menu “2-Tone Set”, then press [PF6] to enter 2-Tone Set Mode. The menu options are shown as follows: Sub Menu Menu Item 2-Tone Encode 2-Tone Decode 2-Tone Option Select submenu “2-Tone Encode”, then press [PF6] to enter.
  • Page 53 RMU800A SERVICE MANUAL Dur. Long: Off Dur. Long A Duration Long: 0.5S 0.5-10.0s Dur. Long: 10.0S Display “END” indicating the end of menu options Select submenu “2-Tone Decode”, then press [PF6] to enter. Function Setting Display Remarks 2-Tone 1 2-Tone Code No.
  • Page 54 RMU800A SERVICE MANUAL None Decode2: None Decode2: A-B Decode2: A-C Decode2: A-D Decode2: B-A Decode2: B-C Decode2: B-D Decode2: C-A Decode 2 Format Decode2: C-B Decode2: C-D Decode2: D-A Decode2: D-B Decode2: D-C Long A Decode2: A Long B Decode2: B...
  • Page 55 RMU800A SERVICE MANUAL None Decode4: None Decode4: A-B Decode4: A-C Decode4: A-D Decode4: B-A Decode4: B-C Decode4: B-D Decode4: C-A Decode 4 Format Decode4: C-B Decode4: C-D Decode4: D-A Decode4: D-B Decode4: D-C Long A Decode4: A Long B Decode4: B...
  • Page 56 RMU800A SERVICE MANUAL None None Alert Alert Call Response 1 Transpond Transpond Alert & Tran Alert & Tran None None Alert Alert Call Response 2 Transpond Transpond Alert & Tran Alert & Tran None None Alert Alert Call Response 3...
  • Page 57 RMU800A SERVICE MANUAL Tone A Tone A Decode Code Decode 2 Decode Code Alert Tone Alert Tone 1 Ref. “Alert Tone” in Function Alert 1-8 Set Mode Alert Tone 8 Tone A Tone A Decode Code Decode 3 Decode Code...
  • Page 58 RMU800A SERVICE MANUAL Display “END” indicating the end of ++END menu options 3. Select submenu “2-Tone Option”, then press [PF6] to enter. Function Setting Display Remarks Rise 200ms Default Time 200ms Rise 2-Tone Tx Rise Time Time 100ms 100-1000ms Rise...
  • Page 59 RMU800A SERVICE MANUAL 1. Select submenu “Parameter”, then press [PF6] to enter. Select Parameter 1-16 to set 5-Tone parameters. Function Setting Display Remarks Parameter 1 Parameter1-16 5-Tone Parameter Default: Parameter 1 Step 1 Parameter 16 SingleTone 0 SingleTone SigleTone 0-F...
  • Page 60 RMU800A SERVICE MANUAL TxRx TxRx Eurosignal Eurosignal TxRx Natel NATEL TX/RX Address TxRx Standard TxRx MODAT MODAT TxRx CCITT CCITT TxRx USER DEFINED USER DEFINED None None Decode Code 1 Telegram 1 Decode Telegram 1-10 Telegram 10 None None Decode Code 2...
  • Page 61 RMU800A SERVICE MANUAL Select submenu “Encode Teleg”, then press [PF6] to enter. Function Setting Display Remarks 5-Tone Encode Telegram EncodeTel 1 Default: EncodeTelegram 1 EncodeTelegram 1-32 Step 1 EncodeTel 32 1stF Disable Disable 1stF RxAdress RxAdress 1stF First Frame Default: Disable...
  • Page 62 RMU800A SERVICE MANUAL Disable Disable Transpond Decode Default: Disable Decode Tel 1 DecodeTel 1-10 Decode Tel 10 Name Refer to Appendix 1 “Character 12345 TelegramName Input” Name ------------ Display “END” indicating the end of menu options 3. Select submenu “EncodeFrame”, then press [PF6] to enter.
  • Page 63 RMU800A SERVICE MANUAL 4. Select submenu “EncodeOption”, then press [PF6] to enter. Display Function Setting Remarks Delay 0ms 0-7000ms 5-Tone Delay 1 Default: 100ms Step 10ms Delay 7000ms Delay 0ms 0-7000ms 5-Tone Delay 2 Default: 300ms Step 10ms Delay 7000ms...
  • Page 64 RMU800A SERVICE MANUAL Display “END” indicating the end of menu options 5. Select submenu “Decode Telegr”, then press [PF6] to enter. Display Function Setting Remarks 5Tone Decode Telegram DecodeTel 1 Decode Telegram 1-10 Decode Tel 10 ZVEL1 ZVEL1 ZVEL2 ZVEL2...
  • Page 65 RMU800A SERVICE MANUAL None None Normal FFFFFFFF Frame 3 Default: None Rx Address Rx Address Single Single Tone Disable Moni Disable Monitor Default: Open Close Moni Close Open Moni Open Disable Stun Disable Stun Stun Enable Revive Stun Revive Stun...
  • Page 66 RMU800A SERVICE MANUAL 6. Select submenu “Decode Option”, then press [PF6] to enter. Function Setting Remarks Display Auto Reset Time Off 5 Tone Auto Auto Reset Time 1-180s ResetTime1 Default: Off Step 1s Auto ResetTime180 Next Decode Delay 0-2550ms NDDT 0ms...
  • Page 67 RMU800A SERVICE MANUAL Dealer Mode 9: Emergency Set Select menu “Emergency Set”, then press [PF6] to enter. Function Setting Remarks Display Selector Knob: change a Emergency Zone Zone: 1-256 channel or zone (default ch) Emergency CH CH: 1-512 CH 100...
  • Page 68 RMU800A SERVICE MANUAL Tex t ---------------------- No Text to be Displayed ---------------------- Emergency Tex t Display Text Emergency Max 12 Emergency Mod e Silent Silent Emergency Mode Mod e Audible Audible Ton e 1 Dur. Tone 1 Duration 0-255s Ton e Step 1s 1 Dur.
  • Page 69 RMU800A SERVICE MANUAL 1. Select submenu ‘Stun Set”, then press [PF6] to enter. Function Setting Display Remarks Stun ------------ No encode, disable Stun Disable Stun Stun Encode 0000000 0000000 Stun ~FFFFFFF FFFFFFF Stun TX Inhibit Default TX Inhibit Stun Stun Response...
  • Page 70 RMU800A SERVICE MANUAL Mode ZoneSet Off Zone Information Mode Mode Default ZoneSet On Mode FuncSet Off Function Set Mode Mode Default FuncSet On Mode ScanSet Off Scan Information Mode Mode Default ScanSet On Mode DTMFSet Off DTMF Set Mode Mode...

  • Page 71: Test Mode

    RMU800A SERVICE MANUAL Mode WireCloneOff Clone Mode Mode Default WireClone On Mode ModelSel Off Model Set Mode Mode Default ModelSel On Prog Firmware Download FirmWare Off Mode Prog Default FirmWare On Firmware Version Version Off Display Default Version On Display “END” indicating the end of menu options 2.
  • Page 72 RMU800A SERVICE MANUAL In this mode, the channel frequency (center, low, high) can be modified through the programming software. CH1 ( C) CH 2 ( L ) CH 3 ( H ) Model RX/TX CH 4 CH 5 CH 6...
  • Page 73 RMU800A SERVICE MANUAL 2. In Test Mode, the following functions can be accomplished by key pressing. Function Description Volume Up Down Volume down Wide band/Narrow band Squelch Open/Close “ ” icon appears when squelch is opened. Test Mode/ Adjustment Mode...
  • Page 74 RMU800A SERVICE MANUAL In Test Mode, user can press the following key to switch models. Press [PF3] to toggle between Test Mode and Adjustment Mode. ① Press [PF4] to toggle between Adjustment Mode and Model Set Mode ([PF4] is invalid if Model Set Mode is inhibited by your dealer.
  • Page 75 RMU800A SERVICE MANUAL 5. Setting Items （＊＊＊：1-256） Wideband/ Main LCD Setting Item Frequency Sub LCD Description Narrowband Center CDCSS BAL *** 100Hz square wave Wide CDCSS BAL *** 100Hz square wave CDCSS Balance High CDCSS BAL *** 100Hz square wave...
  • Page 76 RMU800A SERVICE MANUAL Center No signalling OpenSQL9 *** SQL 9 No signalling OpenSQL9 *** Wideband High No signalling OpenSQL9 *** SQL 9 Center OpenSQL9 *** No signalling Narrowband SQL Open Center No signalling OpenSQL3 SQL3 No signalling OpenSQL3 Wideband High...
  • Page 77 RMU800A SERVICE MANUAL Model Set Mode Turn power on while holding down [PF2], the radio enters Test Mode. The frequency test channel and signalling test channel are displayed. In Test Mode, press [PF3] to enter Adjustment Mode. In Adjustment Mode, press [PF4] to enter Model Set Mode. “DESTINATION” and the model No.

  • Page 78: Circuit Description

    RMU800A SERVICE MANUAL Circuit Description 1. Frequency Configuration The receiver utilizes double conversion superheterodyne. The first IF is 73.05MHz and the second is 450KHz. The first local oscillator signal is supplied by PLL circuit. The second local oscillator signal (73.5MHz) is generated from TCXO (73.5MHz); The PLL circuit also generates the frequencies needed in the transmitter (See Fig.1).
  • Page 79 RMU800A SERVICE MANUAL IF Amplifier The first IF signal is amplified by Q125, Q118 and then enters IC119（TA31136FN）. The signal is mixed with the second local oscillator signal (73.05MHz) to create a 450KHz second IF signal. The second IF signal is then fed to a ceramic filter (N: CF101, CF103; W: CF102, CF104) to eliminate unwanted signals.

  • Page 80: Pll Circuit

    RMU800A SERVICE MANUAL 3.2 Driver and Final Power Amplifier Circuit TX-RF signal is outputted from Q703 in VCO circuit and amplified by Q126, Q127 and Q128. The amplified signal is then fed to IC102 (Power Module) and passes through LPF before reaching the antenna terminal.
  • Page 81 RMU800A SERVICE MANUAL 5. Control Circuit Circuit in this section is comprised of CPU, reset IC, power supply controller and flash ROM. 5.1 CPU IC120 (CPU) operates at 9.8304MHz. It controls the data transmission between receive circuit, transmit circuit, control circuit, display circuit and peripheral circuit.
  • Page 82 RMU800A SERVICE MANUAL Vout provides power supply to IC115, IC114, IC113, and IC111, which produces 8V, 9V, 5V, and 3.3V voltage to the circuit. 6. Display Circuit Display circuit is comprised of CPU (IC503), LCD module, LED and other components. Radio features are programmable by PF1-PF6.

  • Page 83: Semiconductor Data

    RMU800A SERVICE MANUAL Semiconductor Data 1. Voltage Supply: TA7805F (Display Unit IC501): Providing supply voltage. 2. Voltage Detector: R3111H421C(Display Unit IC502) 2-1.Pin Function Pin No. Name Function Vout Reset. GND. Supply voltage. 3. Display CPU: UPD780112(Display Unit IC503) 3-1.Pin Function Pin No.
  • Page 84 RMU800A SERVICE MANUAL HMBL MIC backlight control signal output. HOOK/RXD0 Hook signal input/ Serial data input. TXD0 PC commands (TXD)/connects to PTT. RLED Red LED output. GLED Green LED output. PTT/connect to TXD0. DNKEY Up key. UPKEY Down key. KEYBL Key backlight.
  • Page 85 RMU800A SERVICE MANUAL 6. Audio processor: AK2346 (TX-RX Unit IC106) 6-1 Pin Function Pin No. Name Function AGNDIN Analog ground input pin. AGND Analog ground output pin. TXIN Transmit audio signal input pin. TXINO TXA1 feedback output pin. LIMLV Limit level adjuster pin.
  • Page 86 RMU800A SERVICE MANUAL 7. DTMF Receiver: LC73872M (TX-RX Unit IC122) 7-1 Pin Function Pin No. Name Description INPUT Signal input. No connection. The IC goes to lower power mode when this pin is pulled high. OSCO Oscillator output. OSCI Oscillator input.
  • Page 87 RMU800A SERVICE MANUAL 9. Power amplifier: TDA8561Q (TX-RX Unit IC126) 9-1 Pin Function Pin No. Name Description -INV1 Non-inverting input 1. GND(S) Signal ground. INV2 Inverting input 2. Supply voltage ripple rejection. Supply voltage. OUT1 Output 1. GND1 Power ground 1.
  • Page 88 RMU800A SERVICE MANUAL 15. CPU: M16C (Tx-Rx Unit IC120) 15-1 Pin Funcion PIN No. PORT PIN NAME DESCRIPTION P94/DA1 2TN/5TN 2-tone/5-tone decode pulse input P93/DA0 DTMF DTMF/2Tone/5Tone/BEEP output SB power switch control. H: off L: on AFDIO AK2346 DATA I/O (SDAT)
  • Page 89 RMU800A SERVICE MANUAL NC (left floating) HOLD NC (left floating) NC (left floating) NC (left floating) Read (for expansion) NC (left floating) Write (for expansion) Horn alert control On: H SHIFT Clock frequency shift On: H W/N switch W: L...

  • Page 90: Component Description

    RMU800A SERVICE MANUAL Component Description 1. TX-RX Unit Ref. No. Part Name Type Description IC102 Power module Power module IC103 AT29C02-90T1 Flash ROM IC104 NJM2904V Single-supply dual operational amplifier IC105 AT2408N12.5S EEPROM IC106 AK2346 Audio processor IC107 TA75W558FU Dual operational amplifier...
  • Page 91 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark C278 3001064730000 Resistor 0603 47K Ω J 1/10W(RoHS) R101 3001066830000 Resistor 0603 68K Ω J 1/10W(RoHS) R102 3001068230010 Resistor 0603 82K Ω J 1/10W(RoHS) R103 3001063940010 Resistor 0603 390K Ω...
  • Page 92 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark R145 3001062710000 Resistor 0603 270 Ω J 1/10W(RoHS) R146 3001061020010 Resistor 0603 1K Ω J 1/10W(RoHS) R147 3001061800000 Resistor 0603 18 Ω J 1/10W(RoHS) R148 3001062710000 Resistor 0603 270 Ω...
  • Page 93 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark R193 3001060000000 Resistor 0603 0 Ω J 1/10W(RoHS) R194 3001064730000 Resistor 0603 47K Ω J 1/10W(RoHS) R195 3001065130010 Resistor 0603 51K Ω J 1/10W(RoHS) R196 3001061030010 Resistor 0603 10K Ω...
  • Page 94 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark R238 3001062220000 Resistor 0603 2.2K Ω J 1/10W(RoHS) R239 3001062220000 Resistor 0603 2.2K Ω J 1/10W(RoHS) R240 3001061030010 Resistor 0603 10K Ω J 1/10W(RoHS) R241 3001062710000 Resistor 0603 270 Ω...
  • Page 95 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark R238 3001062220000 Resistor 0603 2.2K Ω J 1/10W(RoHS) R239 3001062220000 Resistor 0603 2.2K Ω J 1/10W(RoHS) R240 3001061030010 Resistor 0603 10K Ω J 1/10W(RoHS) R241 3001062710000 Resistor 0603 270 Ω...
  • Page 96 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark R331 3001061840000 Resistor 0603 180K Ω J 1/10W(RoHS) R332 3001062730010 Resistor 0603 27K Ω J 1/10W(RoHS) R334 3001060000000 Resistor 0603 0 Ω J 1/10W(RoHS) R335 3001060000000 Resistor 0603 0 Ω...
  • Page 97 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark R380 3001061030010 Resistor 0603 10K Ω J 1/10W(RoHS) R381 3001064740010 Resistor 0603 470K Ω J 1/10W(RoHS) R382 3001064740010 Resistor 0603 470K Ω J 1/10W(RoHS) R383 3001060000000 Resistor 0603 0 Ω...
  • Page 98 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark R170 3001161210000 Resistor 2010 120 Ω J 1/2W(RoHS) R158 3001162200000 Resistor 2010 22 Ω J 1/2W(RoHS) R359 3001164710000 Resistor 2010 470 Ω J 1/2W(RoHS) CP101...
  • Page 99 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark C113 3101061020000 Capacitor 0603 1000PF K 50V GRM188R11H102KA01B MURATA(RoHS) C114 3101061030010 Capacitor 0603 0.01UF K 25V(RoHS) C115 3101061030010 Capacitor 0603 0.01UF K 25V(RoHS) C116 3101061020000...
  • Page 100 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark C159 3101064710000 Capacitor 0603 470PF K 50V MURATA(RoHS) C160 3101064710000 Capacitor 0603 470PF K 50V MURATA(RoHS) C161 3101061040010 Capacitor 0603 0.1UF K 16V (RoHS) C162...
  • Page 101 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark C206 3101061010010 B10F Capacitor 0603 100PF J 50V GRM1882C1H101JA01B MURATA(RoHS) C207 3101061010010 Capacitor 0603 100PF J 50V GRM1882C1H101JA01B MURATA(RoHS) C208 3101061010010 Capacitor 0603 100PF J 50V GRM1882C1H101JA01B MURATA(RoHS)
  • Page 102 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark C250 3101061030010 Capacitor 0603 0.01UF K 25V(RoHS) TM-800 C251 U(2) C252 3101061030010 Capacitor 0603 0.01UF K 25V(RoHS) TM-800 C253 3101080200000 Capacitor 1206 2PF C 500V MURATA(RoHS)
  • Page 103 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark C296 3101061020000 Capacitor 0603 1000PF K 50V GRM188R11H102KA01B MURATA(RoHS) C297 3101061030010 Capacitor 0603 0.01UF K 25V(RoHS) C299 3101062240000 Capacitor 0603 0.22UF K 10V(RoHS) C300 3101061020000...
  • Page 104 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark C341 3101061050080 Capacitor 0603 1UF Z 16V MURATA(RoHS) C342 3101061020000 Capacitor 0603 1000PF K 50V GRM188R11H102KA01B MURATA(RoHS) C343 3101061040010 Capacitor 0603 0.1UF K 16V (RoHS)

  • Page 105: Part List 1

    RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark TM-800 C602 3101061590010 Capacitor 0603 1.5PF B 50V MURATA(RoHS) U(2) TM-800 C603 3101063300000 Capacitor 0603 33PF J 50V MURATA(RoHS) U(2) C604 3101064710000 Capacitor 0603 470PF K 50V MURATA(RoHS)
  • Page 106 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark L105 3215006100009 Inductor 0603 10nH LL1608-FH10NK TOKO L106 3221506601009 Chip ferrite bead 0603 600 Ω ±25% BLM18AG601SN1 MURATA(100MHz) L107 3221506601009 Chip ferrite bead 0603 600 Ω ±25% BLM18AG601SN1 MURATA(100MHz) B10N Trimmer IF transformer 25.2MHz 780nH±2%(1M-200M) 5JHH-059798026...
  • Page 107 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark L148 3210208881009 Wound inductor 1206 880nH LQH31HNR88J03L MURATA L149 3210208881009 Wound inductor 1206 880nH LQH31HNR88J03L MURATA 4518026000009 Trimmer IF transformer 25.2MHz 780nH±2%(1M-200M) 5JHH-059798026 SAGAMI L150...
  • Page 108 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark TM-800 D603 3304010100089 Diode 1SV279(TPH3) 1.6*0.8mm TOSHIBA U(2) TM-800 D604 3304010100089 Diode 1SV279(TPH3) 1.6*0.8mm TOSHIBA U(2) TM-800 D605 3304010100089 Diode 1SV279(TPH3) 1.6*0.8mm TOSHIBA U(2) TM-800...
  • Page 109 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark Q146 3503020000109 Transistor 2SK508NV(K52) SMD3 N-CH 5V NEC Q147 3408002000019 Transistor 2SC3357-T1 NPN NEC Q601 3408002000019 Transistor 2SC3357-T1 NPN NEC Q801 3403008000019 Transistor DTC114EE(TL) NPN Rohm...
  • Page 110 RMU800A SERVICE MANUAL Part List 1 Tx-Rx Unit Ref. No Part No. Description Address Remark C408 3103994760089 Electrolytic capacitor 2512 47U 25V +20% 105 ℃ C409 3103994760089 Electrolytic capacitor 2512 47U 25V +20% 105 ℃ C123 3104082260020 Ta-Capacitor1206 22UF +20% 10V(RoHS)
  • Page 111 RMU800A SERVICE MANUAL Part List 1 Display Unit Ref. No. Material No. Material Description Address R506 3001060000000 Resistor 0603 0Ω J 1/10W(RoHS) R511 3001060000000 Resistor 0603 0Ω J 1/10W(RoHS) R522 3001060000000 Resistor 0603 0Ω J 1/10W(RoHS) R548 3001060000000 Resistor 0603 0Ω J 1/10W(RoHS)
  • Page 112 RMU800A SERVICE MANUAL Part List 1 Display Unit Ref. No. Material No. Material Description Address R531 3001064730000 Resistor 0603 47KΩ J 1/10W(RoHS) R504 3001065620010 Resistor 0603 5.6KΩ J 1/10W(RoHS) R558 3001066820000 Resistor 0603 6.8KΩ J 1/10W(RoHS) R545 3001161010000 Resistor 2010 100Ω 1/2W(RoHS)
  • Page 113 RMU800A SERVICE MANUAL Part List 1 Display Unit Ref. No. Material No. Material Description Address D517 3302030500029 Diode UDZSTE(1718B)18V SOD-323 Rohm D507 3307110100009 Diode KPT-1608CGCK KINGBRIGHT D511 3307110100009 Diode KPT-1608CGCK KINGBRIGHT D512 3307110100009 Diode KPT-1608CGCK KINGBRIGHT D509 3307110100009 Diode KPT-1608CGCK KINGBRIGHT...

  • Page 114: Vco Unit

    RMU800A SERVICE MANUAL Part List 1 VCO Unit Ref. No Part No. Description Address R701 3001063300000 Resistor 0603 33 Ω J 1/10W RCT03330JTP(RoHS) R702 3001062210000 Resistor 0603 220 Ω J 1/10W(RoHS) R703 3001063300000 Resistor 0603 33 Ω J 1/10W RCT03330JTP(RoHS)
  • Page 115 RMU800A SERVICE MANUAL Part List 1 VCO Unit Ref. No Part No. Description Address C720 3101060590010 Capacitor 0603 0.5PF B 50V MURATA(RoHS) C721 3101061010010 Capacitor 0603 100PF J 50V GRM1882C1H101JA01B MURATA(RoHS) C722 3101060700020 Capacitor 0603 7PF B 50V MURATA(RoHS) C724...

  • Page 116: Exploded View

    RMU800A SERVICE MANUAL Exploded View － 115 －...

  • Page 117: Part List 2

    RMU800A SERVICE MANUAL Part List 2 No. Part No. Part Description Material QTY Remark 6000224000009 Rear cover PC*ABS 7102623020009 Self-tapping screws 2.6*23 6300025000009 Shield cover ADC12 6201184000009 Shield sheet copper COPPER 7102004020049 Bolt PTS 2×4 610022600000 Seal gasket (shield) Silica gel (50 degree hardness)
  • Page 118 RMU800A SERVICE MANUAL Contact rotary switch 7300007100009 5205000000269 Jack (Remote SP MIC) 5110000000119 RMU800ALCD (FSTN) 4301030000000 Switch (channel) 6201177000009 VCO cover 6201181000009 Clip (power amplification cooler) 6201182000009 Clip (power module cooler) 7500072000009 Absorbing sponge － 117 －...

  • Page 119: Disassembly And Reassembly For Repair

    RMU800A SERVICE MANUAL Disassembly and Reassembly for Repair Disassembly 1. Power off the transceiver; disconnect the power cable and screw out the antenna connector. 2. Lift the tabs on the bottom of the transceiver, and then remove the panel from the transceiver.
  • Page 120 RMU800A SERVICE MANUAL 6. Loosen the screw that binds the power cable (black) to the PCB board; loosen the screws on the external board and d15-pin plug; remove the external board and the waterproof packing. 7. Loosen the screw on the power amplification module; loosen by welding the connector that connects power amplification module to the main PCB, and then pull out the module.
  • Page 121 RMU800A SERVICE MANUAL Screw on the four adjustment screws (each with one shrapnel and one shim). Plug the connector (Remote SP MIC) to the jack (Remote SP MIC); when the remote SP MIC is not in use, hang it on the bracket (Remote SP MIC).

  • Page 122: Remote Kit Installation (Optional)

    RMU800A SERVICE MANUAL Remote Kit Installation (Optional) The remote kit is optional, the steps of installation as follow: 1. Lift the tab on the bottom of transceiver, and then pull the panel away from the transceiver. 2. Remove the connector that binds the display unit to the TX-RX unit.
  • Page 123 RMU800A SERVICE MANUAL 7. For the first three steps of the rear panel installation, please refer to step 3, 4 and 5. 8. Plug the connector from the front panel into the socket, as shown following. Affix the ground wire (from the rear panel) to the chassis with the supplied screw.

  • Page 124: Packing

    RMU800A SERVICE MANUAL Packing － 123 －...

  • Page 125: Adjustment

    RMU800A SERVICE MANUAL Adjustment 1. Key Functions 1-1 Front Panel 1. Power switch. 2. Selector Knob. 3. LCD Display. 4. Down key. 5. Up key. 6. Indicator light. 7. Microphone Jack. 8. PF1 key. 9. PF2 key. 10. PF3 key.
  • Page 126 RMU800A SERVICE MANUAL When the Function is On (press PF4, ▽ appears) Controls Function Description Compander on/off. When compander opens, ▼ appears. When the remove frequency is on, “A” appears. Beat shift on/off. MSK 1200/2400bps changeover. When MSK is 2400bps，“...
  • Page 127 RMU800A SERVICE MANUAL 2-2. Test Frequency Channel (MHz) In this mode, the test channel frequency (center(C)、low(L)、high(H) frequency) can be modified through the programming software. RX/TX 1 ( C ) 2 ( L ) 3 ( H ) Model RX(MHz) 155.15 136.15...
  • Page 128 RMU800A SERVICE MANUAL 3-2. Tuning Item and Display Refer to “5. Setting Items” in “Test Mode”. 3-3. Flow Chart : Use the [PF4] and [PF5] keys. : Use the [PF6] key. 3. Use the [SELECTOR] knob to set an adjustment value (1 to 256) for each adjustment item.
  • Page 129 RMU800A SERVICE MANUAL [PF6] [PF2]+Power ON CDCSS deviation(Center) CDCSS deviation [PF3] [PF6] Frequency Panel test mode CDCSS deviation(Low) [PF6] [PF6] [PF6] CDCSS deviation(High) TX high power (Center) power [PF6] [PF6] CDCSS deviation(narrow TX high power (Low) Center) [PF6] [PF6] TX high power (High)
  • Page 130 RMU800A SERVICE MANUAL 4. Test Equipment Required for Alignment Test Equipment Method Major Specifications Standard Signal Frequency 450 to 512 MHz Generator (SSG) Modulation Frequency modulation and external modulation Output 0.1uV to greater than 1mV Power Meter Input Impedance 50Ω...
  • Page 131 RMU800A SERVICE MANUAL 4-2. Test Cable for Microphone input The following test cable is recommended. 5. Warnings When Removing or Installing the Shield Cover When handling with the shielding cover, do not damage the components on the TX-RX unit. When installing the shielding cover, insert the cover from the rear side.

  • Page 132: Adjustment Description

    RMU800A SERVICE MANUAL Adjustment Description The radio can be adjusted by PC programming software or by manual adjustment. Manual adjustment procedure of RMU800A is as follows. (Refer to “Test Mode” and “Adjustment mode” in the section Radio Modes.) Instrument: Radio Communication Test Set...
  • Page 133 RMU800A SERVICE MANUAL Model RX/TX 1 ( FC ) 2 (F L ) 3 (FH ) 155.15 136.15 145.55 155.00 155.40 RX(MHz) 173.85 164.55 155.20 （V） 155.00 136.00 174.00 164.50 155.00 155.20 155.40 TX(MHz) 145.50 481.15 450.15 465.55 481.00 481.20 481.40...
  • Page 134 RMU800A SERVICE MANUAL Transmitter Measurement Adjustment Specification Item Condition /Remarks Test Instrument Terminal Part Method Enter adjustment item Radio Adjust software “1”, each Ch Communication Adjust to CH frequency Error <50Hz 4.TX Frequency corresponds to a settings Test Set specific TX Freq High power: PO=45±1.0W...
  • Page 135 RMU800A SERVICE MANUAL Each Ch corresponds Radio to a specific TX Freq， Communication Change CTCSS Adjust deviation to 10.CTCSS enter adjustment item Test Set settings with 0.75KHz±0.10KHz (W) Deviation “5”, adjust FILTER Selector Knob 0.37KHz±0.05KHz (N) 67Hz/127.3Hz/254.1Hz LPF: 300Hz CTCSS...
  • Page 136 RMU800A SERVICE MANUAL Receiver Measurement Adjustment Specification Item Condition /Remarks Test Instrument Terminal Part Method Adjust the gain to the Max. value, the Enter adjustment item Adjust corresponding freq 15.RF bandpass “10”, Scanner ANT. TP1 software is on the left most...
  • Page 137 RMU800A SERVICE MANUAL Radio Press [PF2] to Communication Adjust software adjust software Test Set Enter adjustment item “11”, settings at SQL3 settings , open the SSG output: turn to CH (H), CH(C), CH 19.SQ Open and SQL9，press squelch while -119dBm（level 3）...

  • Page 138: Terminal Function

    RMU800A SERVICE MANUAL Terminal Function 1. Display Unit Pin No. Name Description J501 (To MIC Jack) MIC backlight control signal output. “H”: On, “L”:Off. Power outputs after power switch (13.6V+15%). Ground. PTT/TXD PTT signal input/ Serial data output. MIC ground.

  • Page 139: Tx-Rx Unit

    RMU800A SERVICE MANUAL 2. TX-RX Unit Pin No. Name Description J101 (To DISPLAY UNIT) MIC ground. MIC signal output. Ground. REST Reset signal input. TXD2 Serial data output. RXD2 Serial data input. Ground. Power switch control signal output. Power input after power switch (13.6V+15%).
  • Page 140 RMU800A SERVICE MANUAL Pin No. Name Description J111 (at the rear panel; to Secondary Development Interface) TXD0 Serial data input. RXD0 Serial data output. MIC2 External MIC signal output. MIC ground. Filtered Audio output. AUX5 Programmable auxiliary port. AUX4 Programmable auxiliary port.
  • Page 141 RMU800A SERVICE MANUAL GND. AUX1 Programmable auxiliary port. AUX3 Programmable auxiliary port. AUX4 Programmable auxiliary port. AUX2 Programmable auxiliary port. DTMFIO DTMF input/output. TXD0 Serial data output. RXD0 Serial data input. J112 (To GPS) TXD1 Serial data output. RXD1 Serial data input.

  • Page 142: Specifications

    RMU800A SERVICE MANUAL Specifications Frequency Range 450 MHz—512MHz Number of Channels (Zone) Conventional CH:Max.512 (Max 256 zone) Channel Spacing 25/12.5KHz PLL Step 5/6.25 Power Supply 13.6V±15% Duty Cycle Transmit: 20% Operation Temperature -30℃~~+60℃ Frequency Stability ±2.0ppm Antenna Impedance 50Ω 175mm×48mm×170mm Dimensions (W×H×D)
  • Page 143 RMU800A SERVICE MANUAL Appendix 1 Entering Characters Entering characters with an optional microphone keypad CHARACTER Number of times key is pressed NUMBER REMARKS Space Each key can generate numeric and character information. Pressing a key will cause the first character of the key’s character cycle to appear on the LCD;...

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