Motorola Radio Mcs2000 Vol 1 68p81083c20 A Manual
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Troubleshooting 9-5 Troubleshooting Chart 1-2 (3 of 3), Failure Codes Fail 002No Yes Program codeplug No DATA on U0105-13No YesDATA on U0103-63Yes Yes U0104 OK?No Yes Yes U0108 OK? No Repair or Replace U0104Problem Fixed Fail 002No Repair or Replace U0108Check U0103 Check U0105 GOTO SB9600 Bus Rx Chart 1-10 Check U0105 Check U0103GOTO SB9600 Bus Rx Chart 1-10NoNo DATA on U0103-63DATA on U0105-13Yes Yes Error 01/01 Yes 2 From Sheet 2 WARNING Refer to the IC Troubleshooting Procedure before replacing any ICs. Troubleshooting 9
9-6Troubleshooting Troubleshooting Chart 1-3, On/Off Circuit 9.3V on U0501-5 Check U0500, CR0500, C0503Check U0501, Q0500, C0508, R0503, R0504No Yes No START Pulse on U0510-5 13.6V on Q0511-6 5V on U0500-2 Yes Yes Yes 0V on U0510-6 No Press On/Off Switch Check U0510, R0512, C0511No Check CR0510, Q0510, Q0511No GOTO Clock Distribution Chart 1-9 YesR0518 OK?Repair or Replace R0518 No Yes GOTO Control Head Chart 1-8 CHART 1-3 ON/OFF CIRCUIT TROUBLESHOOTING Note: Refer to IC Troubleshooting Procedure before replacing any IC’s.
Troubleshooting9-7 Troubleshooting Chart 1-4, TX Audio TX Audio Routing, SimpliÞed Schematic for Chart 1-4 1KHz 45mVrms on U0200-B8 TP5800 has 1KHz ~114mVrms AC with ~2.5VDC offset GOTO Band Specific RF Transmitter ChartCheck for solder defects on U0200, C0218, R0224, R0233 SPI lines activity at U0200-E3, F1 Check U0103 Check U0200 all bands, U0250 for 900MHz Yes YesYes No No NoInj: 1KHz Tone, 80mVrms at the Internal Microphone Ref: TX Audio Simplified Schematic ~ = Approximately Check R0403, R0404, R0405 SPI activity on pins 66, 67 of U0103No Yes START VR0411 14V C0427 470pF C0219 10µF C0218 0.1µFC0221 0.1µF C0224 0.022µF R0222 100 R0223 1K R0224 470 VR0412 14VC0254 10nF C0251 0.1µF C0257 10nF C0222 10µF C0223 0.022µFC0421 470pF R0230 1K R0252 47.5K R0231 100 R0229 470 EXT MIC INT MIC J0405-9J0403-13 MIC VOLTAGE MIC VOLTAGE C0243 10nF COMP OUT COMP BUF OUT COMP BUF IN HEAR CLEAR U0250 EXT MIC INMIC AMP OUTTX IN PREMP LIM IN VCO MOD INT MIC IN ASFIC U0200VCO ATTN PLACED 900 MHz ONLYD3F2F3 C7 A6 A7C8 E8 B8 H8 25KHz, 80mVrms, 1KHz tone 2.5Vdc 45mVrms 145mVpp 1.5Vdc 46mVrms 152mVpp 2.5Vdc 45mVrms 145mVpp 1.5Vdc 46mVrms 152mVpp 2.5Vdc 45mVrms 139mVpp1.5Vdc 46mVrms 152mVpp 2.5Vdc 45mVrms 139mVpp1.5Vdc 46mVrms 152mVpp 2.5Vdc 114mVrms 372mVpp 1.5Vdc 57mVrms 172mVpp 45mVrms 145mVpp46mVrms 152mVpp 45mVrms 145mVpp 46mVrms 152mVpp 12.5KHz, 80mVrms, 1KHz tone 9.3V
9-8Troubleshooting
Troubleshooting Chart 1-5, RX Audio
~800mVpp
on U0200-J7
Yes
Yes Yes Yes
Yes No
No
No
No
No
CHART 1-5 RX AUDIO
Check speakers
Check
U0203
Check R0234,
C0240, R0239
SPI activity
on pins 66, 67
of U0103Check
U0103 Inj: 1kHz Tone, 3kHz deviation at the appropriate
RX frequency into the antenna connector.
Volume set to ~7.5 Vrms
Ref: RX Audio Simplified Schematic
~ = Approximately
Check
U0200
GOTO Band Specific
IF Receiver Chart
~375mVpp
on U0200-J4SPI activity at
U0200-E3, F1
~68mVpp
on U0203-J9
~5.4 Vpp
on
U0203-6, 4
No
Yes
Check
R0403, R0404,
R0405
START
Troubleshooting9-9 RX Audio Routing, SimpliÞed Schematic for Chart 1-5 C0250 0.1µFC0260 0.1µF C0256 0.1µF C0240 33nF C0229 33pF C0242 3.3nF SPK+ DISC SPK- R0234 4.7K½ R0245 10K R0237 10K R0235 1K½ FFINFFOUT EXP IN EXP OUT HEAR CLEAR i U0250 FLUTTER FIGHTER SUPPORT COMPONENTS APA U0203 ACC CONN J0403 RX INPL IN UNAT RX OUT ASFIC U0200 EXP AUD INRX AUD OUT AMP IN SPK- SPK+ 6Vdc C0202 0.22µF C0999 .0033µF VR0418 20VC0228 0.1µFC0434 470pF R0232 0 C0415 470pF C0236 330pF CONTROLLER BOARD RX AUDIO ROUTING SIMPLIFIED SCHEMATIC J7 J4 J5 H5 C1 A2H6 E4F4 3 2 14 6 9 1 RX_AUDIO EXT SPKRINT SPKR R0238 68K U0200-H5 J0403-11 J0405-8RX_ HI FILTERED AUDIO HANDSET AUDIO VAG +-- PLACED ONLY FOR iDEN HANDSET 900MHZ ONLY 260mVrms 800mVpp 109mVrms 348mVpp 260mVrms 800mVpp107mVrms 324mVpp260mVrms 800mVpp107mVrms 324mVpp25KHz12.5KHz 240mVrms 679mVpp 254mVrms 718mVpp 40mVrms 113mVpp 45mVrms 127mVpp40mVrms 7.5V 40mVrms 7.88V 680mVrms670mVrms 6Vdc6Vdc
9-10Troubleshooting Troubleshooting Chart 1-6, Signalling Yes No CHART 1-6 SIGNALLING During TX is there a 1 or 2kHz signal at U0200-C3? YesNo Radio mutes if proper PL/DPL is not presentYes NoDATA ON U0200-A4 Check for solder defects on U0200Check U0103 Check U0200-01 Check U0104 START
Troubleshooting9-11 Troubleshooting Chart 1-7, DC Distribution CHART 1-7 DC DISTRIBUTION No Yes13.6V on U0502-8 No Yes8V on U0502-1 No Yes9.3V on U0501-5 No5V on U0500-2 Check C5613, C5617, L5611, R0432, J5500-1, 2 No Yes13.6V on connector J1Check DC input and fuse Check U0502 No Yes~13.0V on U0501-1GOTO On/Off Circuit Chart 1-3 Check U0501, Q0500, C0508, R0503, R0504 Check U0500, CR0500, C0501, C0504 Yes No Yes 5V on U5802-3Check U5802, L5765, C5766, C5767 Check U5801, Q5770, C5770, C5810 Ref: Chart 1-3 and DC Voltage Distribution Simplified Schematic START
9-12Troubleshooting Radio Voltage, SimpliÞed Schematic For Chart 1-7 CONTROL HEAD 9.3V REG U0501 CONTROLLER TRANSMITTER AUDIO PA U02038V REG U0502 5V REG U5802TX P/A MIC VOLT OPTIONS J0401 J0408 K4 µP HEAR CLEAR U0250 SLIC IVA U0104 5V REG U0500EEPROM U0108 NOT PLACED ELEC ON/OFF PWR OFF DLY U0510/Q0510/Q0511 ASFIC U0200 F1 µP U0103 ROM U0106 RAM U0101 FRAC N U5801 A+ CONT PEND U5800 VCO ACC CONNECTOR ZIF U3201 5V REG J0405-17 J0405-18 J0405-16 J0405-7, 13A+ B A T T E R Y UN SW 5V S W B + CASTING MAIN SHIELD RADIO VOLTAGE SIMPLIFIED SCHEMATIC RECEIVER / SYNTHESIZER A L T E R N A T O R Q0553 K 9.1V Q0552 Q5770 SWB+
Troubleshooting9-13 Troubleshooting Chart 1-8A, Control Head Model I Numbers in brackets refer to accompanying troubleshooting procedure overleaf. Control Head Model C Troubleshooting Chart Radio can turn on/off? (1.1)Check on/off switch (1.1)No Yes Radio resets control head? (2.1)Error in radio!No Yes Yes 5VDC OK? (1.2)Check 5V supply (1.2)No Reset circuit works? (2.2)Check Q0652, U0657, D0674 (2.2)No Yes Keypad OK? (7)Check electrical connection to µP Clean PCB or replace keypad (7)No Yes Yes Replace and factory programming and alignment necessary Keypad backlight: See LCD backlight (10)Volume control OK? (6)Check R0698 (6) No Under- voltage detector works? (2.3)Replace U0657 (2.3)No Yes Accessory is defect! (Communication not OK) Micro- processor clock runs? (3)Check Y0650 and U0653 (3)No Yes Yes Serial bus communication OK? (4) FL 01/90 Radio never starts after power on Check the following: BUS + (4.1) BUS- (4.2) BUSY (4.3) BUS+/BUS- Comparator (4.4) No No Yes LED indicators OK?Check U0653, Q0659, Q0660, Q0661 and LEDs (9) All LEDs? No Yes LCD backlight OK? Check the LEDs (10.2) No No YesYes Check U0653, Q0651 and U0652 (10.1) Yes Communication stops only with accessory on MIC Conn? (4.5) SW B+ and multiplexing of MIC connector OK? Check the following: SW B+ voltage in normal mode (5.1) Multiplexer in normal position (5.2) PTT input (5.3) Monitor input (5.4) AUX input (5.5) SW B+ in SB9600 Mode (5.6) SW B+ in SB9600 Mode (high load) (5.7) Multiplexer in SB9600 Position (5.8) No Text in LCD display OK?Check the following: Defect outside segment area (11.1) Missing segments? (11.2) Weak segments? (11.3) LCD bias voltage (5 or 5.6 volts)? (12)No Yes Secure keyloading OK?Check the following: Check input from P0651 to µP U0653 (13.1) Check multiplexer position (13.2) Check connections through multiplexer including ESD protection diodes (13.3)No Yes Yes Micro- processor OK?No END START MAEPF-25121-O
9-14Troubleshooting Control Head I Troubleshooting Procedure 1Power Supply Check that the radio is connected to a power supply. 1.1ON/OFF switch -Check that radio turns on. I.e. SW B+ is 12V DC. If not, press the ON/OFF switch to turn the radio off again. -If the radio does not turn ON, verify that there is DC voltage on the MIC-HI/ON_OFF line and that this voltage goes to ground when pressing the ON/OFF switch. -If DC voltage is present, but does not go low, check J0650 and R0698. 1.25V DC supply 12VDC is now assumed to be present both on A+ and SW B+. -Check that there is 5 VDC on U0654 pin 3. If not check R0673 and U0654. 2Reset -Check that the control head reset is functional. 2.1Radio resets control head -Monitor uP reset on U0653 pin 18 with an oscilloscope. Turn radio off and on. -Check that the uP reset goes from low to high (5 VDC) after power up and stays high. 2.2Check reset circuit -If U0653 is not reset check Q0652 and U0657. -Check that D0674 is not shorted. 2.3Check the undervoltage detector IC U0657 -Disconnect the control head from the radio and connect J0650 pins 7 and 13 to ground and pins 17 and 18 to a variable DC supply. -Measure the DC voltage at U0654 pin 3. -Monitor U0657 pin 1. -Increase slowly the DC supply starting from 4 V. -Check that U0657 pin 1 changes from 0V to 5 VDC when TP3 is approx. 4.3 V. If not replace U0657. -Connect J0650 pin 3 to U0654 pin 3 (VCC). Check that U0657 pin 1 goes low. -If not replace Q0652. 2.4Continuous reset -If the control head is continuously reset by the radio it may be due to a bus communication problem or the microprocessor not working. 3Microprocessor Clock -Check that the microprocessor oscillator is working (4 MHz square wave on TP2). If not, check Y0650 and U0653. -Clean PCB area round Y0650. 4Serial Bus Communication A general serial bus communication problem in the radio is typically indicated by the radio remaining inactive on power up, and the display showing FL 01/90. Make sure that no accessory is connected to P0651 (MIC Connector) and check the following lines with an Oscilloscope while turning the radio on and off. 4.1SB9600 BUS+, J650 pin 15 -This signal is normally 5 VDC with short pulses to 0V when data are sent on the bus. If it is constantly 0 V or 5 VDC check D0677 (most common error), Q0655 and Q0656.