Motorola Gm328 Gm338 Gm398 Detailed 6804112j18 E Manual
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Troubleshooting Flow Chart for 25W Transmitter 3-3 2.0 Troubleshooting Flow Chart for 25W Transmitter (Sheet 1 of 3) Current increase when keyed? NO YES START Check if Pressure Pad closes S3440 Check Components between Q3441 and RF Output, Antenna Switch D3471,D3472,Q3472 VR3471,Q3471>500mA & 4A 1V Short TP3403 to Ground NO YES Voltage at TP3402 rises?Check PA StagesNO YES PCIC U3501 Pin 14 9.3V DC?Check 9.3 V Regulator U0641 NO YESPCIC U3501 Pin 16 >4V DCReplace PCIC U3501 NO YESTP3404 9.1V DC If U3201 Pin 2 is high, replace PCIC U3501,otherwise check controller and FGU YES NOTP3403 >0.5V DC?Replace PCIC U3501 Check Forward Power Sense Circuit (D3451) Check Forward Power Sense Circuit (D3451) NO YESPCIC U3501 Pin 5 > 1V DC? Check Power Setting, Tuning & Components between PCIC Pin 5 and ASFIC (U0221) Pin 4 before replacing ASFIC No or too low Power when keyed
3-4 Troubleshooting Flow Chart for 25W Transmitter 2.1Troubleshooting Flow Chart for 25W Transmitter (Sheet 2 of 3) Check PA Stages No or too low Power when keyed Measure DC Voltage at Pin 2 & 3 of U3401>6 YESDC Voltage at U3501 Pin 23 =0? 2-6DC Voltage at U3402-1 Pin 1? YESPin 2 Volt- age 0.62 * Voltage at Pin 1? If U3201 Pin 2 is high, replace PCIC NOReplace U3401 YES NODC Voltage at U3402-1 Pin 3 = 8.8V? Check S3440, R3442 and R3443 YESPin 3 Volt- age 0.51 * Voltage at Pin 1? NOReplace U3401 6V Check Components between U3402-2 Pin 7 and Q3421. Check Resistive Network at Pins 5 & 6 before replacing Q3421 YESDC Voltage at U3402-2 Pin 5
Troubleshooting Flow Chart for 25W Transmitter 3-5 2.2Troubleshooting Flow Chart for 25W Transmitter (Sheet 3 of 3) Check Final PA Stage NO 0V 1-4VBias 2 DC Voltage at TP3406? YESRF Voltage at TP3401 >100mV? YESRF Voltage U3401 Pin 6 >3V? Supply Replace Q3441 Check FGU (U3301) NOCheck Components between TP3401 & C3417 NO YESASFIC U0221 Pin 6 1-4V DC? Check Bias Tuning before replacing ASFIC U0221 Check Components between ASFIC and Q3441 before replacing Q3441 YESRF Voltage Q3421 Gate >1V? NOCheck Components between C3417 & Q3421 YESRF Voltage Q3441 Gate >4V? NOCheck Components between Q3421 & Q3441 Check Components between Q3441 & Antenna Connector Voltage
3-6Troubleshooting Flow Chart for Synthesizer 3.0 Troubleshooting Flow Chart for Synthesizer +5V at U3201 Pins 13 & 30? 5V at pin 6 of D3201 Is information from µP U0101 correct? Is U3201 Pin 47 = 13VDC ? Is U3301 Pin 19 4.5 VDC in TX? (at VCO section) Sta rt Visual check of the Board OK?Correct Problem Check 5V Regulator U3211 Is 16.8MHz Signal at U3201 Pin 19? Check Y3261, Y3263 and associated parts Are signals at Pins 14 & 15 of U3201? Check R3201 Check C3319Is U3201 pin 2 >4.5 VDC in Tx &
Troubleshooting Flow Chart for VCO3-7 4.0 Troubleshooting Flow Chart for VCO Are Q3301 Base at 0.7V Collector at 4.5V Emitter at 110mV Are Q3304 Base at 2.4V Collector at 4.5V Emitter at 1.7VAre U3301 Pins 13 at 4.4V 15 at 1.1V 10 at 4.5V 16 at 1.9V Low or no RF Signal at TP3001 Visual check of board OK? 35mV DC at U3301 Pin 19 NO YES at base of Q3301 NO NO NO NONO YES YES YES YESYESLow or no RF Signal at input to PA5V DC at U3301 Pin 14 & 18 OK ? 4.8V DC at U3301 Pin 19 Is RF available at TP3401 YES YESYESYES YES NO NO NO NO NO Audio =180mVrms at “-” side of D3362 2.5VDC at D3362 If C3362 and R3363 are OK, then replace D3362 Replace R3363 Replace R3364 NONO YES YES If R3402 and C3315 are OK, replace U3301 TX VCO RX VCO Correct ProblemVisual check of board OK? Make sure U3211 is working correctly and runner between U3211 Pin 1 and U3301 Pin 14 & 18 is OK Check runner between U3201 Pin 2 and U3301 Pin 19 Is RF available If all parts from U3301 Pin 8 to Base of Q3301 are OK, replace U3301 If all parts associated with the pins are OK, replace Q3301 Check parts between T3001 and Q3301Power OK but no modulation If all parts from TP3401 of U3401 Pin 16 are OK, replace U3401 If all parts associated with the pins are OK, replace U3301 4.5V DC at U3301 Pin 3 OK? YES NO4.5V DC at U3301 Pin 3 OK? YES NO Make sure Synthesizer is working correctly and runner between U3201 Pin 28 and U4301 Pin 3 is OK 5V DC at U3301 Pin 14 & 18 OK ? OK? OK? If all parts associated with the pins are OK, replace Q3301
3-8Troubleshooting Flow Chart for VCO THIS PAGE INTENTIONALLY LEFT BLANK
4-1 Section 4 VHF PCBS/SCHEMATICS/PARTS LISTS 1.0 Allocation of Schematics and Circuit Boards 1.1 Controller Circuits The VHF circuits are contained on the Printed Circuit Board (PCB) which also contains the Controller circuits. This Chapter shows the schematics for the VHF circuits only, refer to the Controller section for details of the related Controller circuits . The PCB component layouts and the Parts Lists in this Chapter show both the Controller and VHF circuit components. The VHF schematics and the related PCB and parts list are shown in the tables below. Table 4-1 VHF 1-25W Diagrams and Parts Lists PCB : 8486172B06 Main Board Top Side 8486172B06 Main Board Bottom SidePage 4-3 Page 4-4 SCHEMATICS Power Amplifier 1 - 25W FRACN Voltage Controlled Oscillator Receiver Front End IF Page 4-5 Page 4-6 Page 4-7 Page 4-8 Page 4-9 Parts List 8486172B06 Page 4-10 Table 4-2 VHF 1-25W Diagrams and Parts Lists PCB : 8486172B07 Main Board Top Side 8486172B07 Main Board Bottom SidePage 4-13 Page 4-14 SCHEMATICS Power Amplifier 1 - 25W Voltage Controlled Oscillator Receiver Front End IF FRACN Page 4-5 Page 4-7 Page 4-8 Page 4-15 Page 4-16 Parts List 8486172B07 Page 4-17
4-2Allocation of Schematics and Circuit Boards THIS PAGE INTENTIONALLY LEFT BLANK
VHF 1-25W PCBs / Schematics / Parts Lists4-32.0 VHF 1-25W PCBs / Schematics / Parts Lists VCO-REV-T3 PA-REV-T1FE-REV-T3 IF-REV-T4 FRAC-T4 CNTL-REV-T6 C0101C0102C0104 C0106 C0107 C0131C0132C0211 C0212 C0221C0222 C0223 C0224C0225 C0226 C0227 C0228 C0231 C0232 C 0233 C0234C0235 C0236C0237 C0241 C0242 C0243 C0244 C0245C0246 C0251 C0252 C0253C0261 C0262C0267 C0421 C0441 C 0442 C 0443 C 0445 C 0446 C 0447 C 0448 C 0449 C 0470 C 0471 C 0472 C 0473 C 0474 C 0476 C 0477 C 0478 C0482 C0483 C0484 C0486C0487C0488C0490 C0493 C0494 C0495 C0496 C0501 C0502 C0503 C0504 C0505 C0506 C0508 C0509 C0510C0511 C0512 C 0513 C0514 C0515 C 0516C0517 C0518 C0542 C0601 C0603C0612 C0651 C0652 C0654 C0655C0681 C3002C3004 C3005 C3006 C3007 C3008 C3009C3010 C3011 C3012 C3013C3014C3015 C3016 C3017 C3018C3019 C3020 C3021C3027 C3028 C3032 C3034 C3100C3101 C3102 C3103 C3114 C3115C3131 C3132 C3133 C3134 C3135 C3136 C3137 C3139 C3140 C3141 C3142C3143 C3145 C3148 C3210 C3211C3213 C3214 C3215C3221 C3222 C3223C3224 C3226 C3227 C3229 C3231 C3232 C3233C3234 C3240 C3242 C3243 C3244 C3245 C3246C3252 C3253 C3254C3255 C3324 C3336 C3337 C3341 C3342C3344 C3345 C3346 C3347 C3357 C3361 C3362 C3363 C3364C3365 C3400C3401 C3403 C3404C3410 C3411 C3412 C3417 C3418 C3419C3420 C3422 C3423 C3424 C3425 C3426 C3428C3431 C3432 C3433 C3434 C3435C3441 C3442 C3443 C3444C3445 C3446 C3447 C3448 C3449 C3453 C3472 C3473 C3474 C3497 C3507 C3508 C3509D0201 D0651 D3001 D3003 D3004 D3031 D3221 D3341D3361 D3362 D3401 D3471 D3472 2 3 4 56 FL31012 3 4 56 FL3102 4 32 FL3112 FL3114 18 1 J0451 20 11 10 J0501 J0601 23J3401 L0481 L0482 L3002 L3031 L3032 L3034 L3100 L3101 L3201 L3232 L3333 L3341 L3343L3344 L3346L3361 L3362 L3363L3364 L3401 L3403 L3411 L3412 L3413L3414 L3422L3443L3471 L3472 L3493 M3421 Q0110 Q0177 Q0181 Q0185Q0681 Q3001 Q3021Q3221 Q3304 Q3411 Q34222 3 45 6 7 8 Q3441 Q3442Q3471 Q3472 R0101 R0102 R0104 R0105R0106R0108R0110 R0114R0115 R0116 R0131 R0132 R0170 R0181 R0182 R0185 R0186R0211 R0212 R0220R0221R0222 R0223R0224 R0225R0226 R0227 R0228R0229 R0241R0242 R0251 R0252 R0253 R0261 R0262R0267 R0268 R0269 R0510R0533 R0535 R0538 R0539 R0611 R0612 R0651 R0652R0681 R0682R3001 R3002 R3003 R3004 R3009 R3013R3014 R3015 R3016 R3024 R3025 R3026 R3027R3028 R3031R3101 R3106 R3111 R3117R3130 R3132 R3135 R3142 R3144R3145 R3211R3221 R3222 R3223 R3224 R3225 R3227 R3242 R3251 R3252 R3335 R3336R3341 R3342R3361 R3362R3363 R3364 R3400 R3401R3402 R3403 R3404 R3405 R3406 R3414R3415 R3416 R3424 R3425 R3426 R3427 R3431 R3432R3433 R 3434 R3435 R3471 R3473 R3491 R3505 R3506 R3507R3508 R3509SH3301 3 461 2 T3001 3 4 6 1 2 T3002 TP3401 1 76 51 26 32 171618 7 1 14 U0211 137 25 13 16 1 8 9 U0251 9 U0271 1 65 1 6 532 111 1 2010 U3101 8 7 1 14U311187 1 14U3115 U3211 1 16 8 9 U3401 U3502 VR0501 VR0503 VR0505 VR0510 234 Y01312 Y3102 1 1 100 11 11 U0101 Microprocessor U0121 Flashrom U0221 ASFIC CMP U0611 B+ SwitchU0641 9,6V RegulatorU0651 5V Regulator 14 5 ZWG0130397-O ZWG0130397-O VHF (136-174 MHz) 1-25W 8486172B06 Top Side
4-4VHF 1-25W PCBs / Schematics / Parts Lists C0103C0105 C0111 C0112C0121 C0122 C0123 C0141 C0151 C0201C0202 C0203 C0204 C0205 C0254C0255 C0265 C0266 C0271C0272 C0273C0274 C0275 C0276 C0277 C0301 C0302 C0303C0304 C0305 C0324C0325 C0331 C0341 C0342 C0343 C0344 C0351 C0352 C0353 C0354 C0422 C0423 C 0426 C 0427 C 0428 C 0429 C0430 C0431 C0485 C0491 C0492 C0497 C0499C0541C0554 C0558 C0559C0560C0575 C0576 C0591 C0592C0593 C0611 C0621C0622 C0641 C0644 C0645 C0661 C0662 C0663 C0671 C3000 C3001C3003 C3022C3023C3024 C3025 C3026 C3029C3030C3031 C3033 C3035 C3036C3104 C3110 C3111C3112 C3113 C3116 C3121C3122 C3123C3144C3146 C3147 C3151 C3152 C3202 C3203 C3205 C3206 C3207 C3208 C3209 C3225 C3228 C3235C3241 C3251C3261C3262 C3263 C3301 C3302 C3303C3304 C3305 C3306C3311 C3312 C3313 C3314 C3315 C3316 C3317 C3318 C3319 C3331 C3332 C3333 C3334 C3335 C3348 C3351 C3352 C3355 C3356 C3402 C3405 C3406C3413C3414 C3415C3416C3421 C3427 C3436 C3437 C3438 C3439C3440 C3450 C3451 C3452 C3471 C3475 C3491 C3492 C3493 C3494 C3495 C3496 C3498 C3499C 3501 C3502 C3503 C3504 C3505C3506 C3510 D0101 D0151 D0179 D0301 D0621 D0660D0661 D3000 D3011 D3101D3201 D3261 D3451E0271 E0272 E0631 43 2 FL3111FL311343 2FL3115 12 J0401 1 40 J05511 18 J0552 L3025L3111 L3112L3231 L3301 L3302 L3311 L3317 L3318 L3331 L3332 L3345L3351 L3402L3421 L3436 L3437 L3491 L3492 Q0151 Q0171 Q0173 Q0183 Q0271 Q0641 Q0661Q0662 Q0663 Q3002 Q3101 Q3102 Q3141 Q3151Q3152 Q3301Q3302 43 Q3303 1 2 3 Q3421 R0107 R0111 R0112 R0113 R0117 R0121 R0151R0152 R0171 R0172 R0173 R0174 R0175 R0176R0177 R0178R0179 R0183 R0184 R0201 R0202R0203 R0204 R0205 R0206 R0207 R0208 R0265 R0266 R0273R0274 R0275 R0276 R0323 R0324 R0331 R0332R0333 R0335R0341 R0342 R0343 R0344R0345 R0346R0347R0401 R0407R0408 R0409R0410R0412 R0441 R0467 R0468 R0481 R0482 R0511 R0512 R0525R0529 R0530 R0531R0537 R0541 R0542 R0591 R0592 R0621 R0641R0642 R0643 R0661 R0662 R0671R0672 R3000 R3006R3010 R3011 R3012R3018R3019 R3021 R3023 R3030R3032 R3033 R3034R3035 R3036 R3102 R3104 R3105 R3107 R3108 R3112 R3113 R3114R3115 R3116R3118 R3133 R3134R3141 R3146R3147 R3151 R3152 R3153 R3154R3201 R3203 R3204 R3206 R3226R3228 R3241 R3261R3262 R3263 R3301 R3302R3303 R3304R3305 R3306 R3307 R3308R3311 R3312 R3313 R3314 R3315 R3316R3317 R3318R3319R3321R3323 R3331 R3343 R3351 R3352 R3353R3354R3355R3356 R3411 R3412R3413 R3417 R3418 R3421 R3422 R3423R3428 R3429 R3440R3441 R3442R3443 R3444 R3445R3446 R3450 R3452 R3454 R3455 R3457 R3474 R3475 R3501 R3502R3504S3440 TP0101 TP0102 TP0103 TP0104 TP0151 TP0221TP0222 TP0481 TP0492 TP0497 TP0530 TP0661 TP3001TP3201TP3202 TP3402 TP3403TP3404 TP3405 TP34061 4 58U011122 21 87 1 161 8 9 U0141 28 15 14 1 U0301 U03311 4 5 8 U0341 U0342 4 5 8 U03511 4 5 8 U0652 U0653 1 37 2513 11 1 20 10 1 4 58U3402117 9 25 U3501 VR0151 VR0504VR0509VR0537 VR0541 VR0601 VR0621 VR0671 VR3471 4 32 Y3101 6 4 3 1 Y3261 2 34Y3263 1 111 1 48 U0122 RAM U3201 FRACN U3301 VCOIC 1 5 8486172B06_T1VCO-REV-T3 PA-REV-T1 C 99 FE-REV-T3 IF-REV-T4FRAC-T4 CNTL-REV-T6 WARIS VHF RF 1-25W Bot Side8486172B06-T1 BOT SIDE CHECK ONE ( ) ILLUSTRATORDATE ENGINEER DATE PROGRAM DISKDWG. NO.Illustrator RK 15. Oct 2000 ZWG0130398 ZWG0130398-O ZWG01300398-O VHF (136-174 MHz) 1-25W 8486172B06 Bottom Side