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Troubleshooting Flow Chart for 25 W Transmitter Section 5: 3-3

6881091C63-F

2.0 Troubleshooting Flow Chart for 25 W Transmitter (Sheet 1 of 3)

Current

increase

when

keyed?

YES

START

Check if Pressure Pad closes S5440

Check Components between

Q4441 and RF Output,

Antenna Switch

D4471,D4472,Q4472,

VR3471,Q3471

>500mA & <4A

>4A

<500mA

Check PA Stages

Control

Voltage at

TP4402

>1V

Short TP4403 to

Ground

YES

Voltage at

TP4402

rises?

Check PA Stages

YES

PCIC U4501

Pin 14 9.3V

DC?

Check 9.3 V Regulator

U0641

YES

PCIC U4501

Pin 16 >4V

Replace PCIC U4501

YES

TP4404

9.1V DC

If U4201 Pin 2 is high,

replace PCIC

U4501,otherwise

check controller and

FGU

YES

TP4403

>0.5V DC?

Replace PCIC U4501

Check Forward Power

Sense Circuit (D4451)

Check Forward Power

Sense Circuit (D4451)

YES

PCIC U4501

Pin 5 > 1V

DC?

Check Power Setting,

Tuning & Components

between PCIC Pin 5

and ASFIC (U0221)

Pin 4 before replacing

ASFIC

No power or low power when keyed

Product Safety and RF Exposure Compliance2
Foreword2
Manual Revisions2
Computer Software Copyrights2
Document Copyrights2
Disclaimer2
Trademarks2
Document History3
Section 1: Service Maintainability7
- Introduction9
- Maintenance13
- Service Aids23
  - 1.0 Recommended Service Tools23
  - 2.0 Recommended Test Equipment25
Section 2: Control Head Service Information27
- Overview29
- Theory of Operation31
- Troubleshooting Charts39
  - 1.0 Control Head CDM750 / PRO3100 Troubleshooting Flow Charts39
  - 2.0 Control Head CDM1250 / PRO5100 / CDM1550 Series / PRO7100 Troubleshooting Flow Charts41
- Control Head PCBs, Schematics, and Parts Lists45
Section 3: Controller Service Maintainability57
- Theory of Operation59
  - 1.0 Controller Circuits59
  - 2.0 Controller Board Audio and Signaling Circuits68
- Troubleshooting Charts79
  - 1.0 Troubleshooting Flow Chart for Controller79
- Controller Schematics and Parts Lists81
Section 4: VHF (136–174 MHz) 1–25 W Service Information147
- Model Charts and Technical Specifications149
  - 1.0 VHF (136–174 MHz) 1–25W Model Charts149
  - 2.0 Technical Specifications150
- Theory of Operation153
- Troubleshooting Charts161
- VHF (136–174 MHz) 1–25 W PCBs, Schematics, and Parts Lists169
Section 5: UHF Band 1 (403–470 MHz) 1–25 W Service Information227
- Model Charts and Technical Specifications229
  - 1.0 UHF Band 1 (403–470 MHz) 1–25 W Model Charts229
  - 2.0 Technical Specifications230
- Theory of Operation233
- Troubleshooting Charts243
- UHF Band 1 (403–470 MHz) 1–25 W PCBs, Schematics, and Parts Lists251
Section 6: UHF Band 2 (450–512/527 MHz) 1–25W Service Information291
- Model Charts and Technical Specifications293
  - 1.0 UHF Band 2 (450–512/527 MHz) 1–25 W Model Charts293
  - 2.0 Technical Specifications294
- Theory of Operation297
- Troubleshooting Charts307
- UHF Band 2 (450–512/527 MHz) 1–25 W PCBs, Schematics, and Parts Lists315
  - 1.0 Allocation of Schematics and Circuit Boards315
  - 2.0 UHF Band 2 (450–512/527 MHz) 1–25 W PCB 8485671Z03, Schematics, and Parts Lists317
    - UHF B2 1–25 W PCB 8485671Z03 Parts List†324
Section 7: Low Band Service Information329
- Model Charts and Technical Specifications331
- Theory of Operation337
- Troubleshooting Charts347
- Low Band PCBs, Schematics, and Parts Lists353
Section 8: VHF (136–174 MHz) 25–45 W Bipolar Service Information453
- Model Charts and Technical Specifications455
  - 1.0 VHF (136–174 MHz) 25–45 W Bipolar Model Charts455
  - 2.0 Technical Specifications456
- Theory of Operation459
- Troubleshooting Charts467
- VHF (136–174 MHz) 25–45 W Bipolar PCBs, Schematics, and Parts Lists473
Section 9: UHF Band 1 (403–470 MHz) 25–40 W Bipolar Service Information491
- Model Charts and Technical Specifications493
  - 1.0 UHF Band 1 (403–470 MHz) 25–40 W Bipolar Model Charts493
  - 2.0 Technical Specifications494
- Theory of Operation497
- Troubleshooting Charts505
- UHF Band 1 (403–470 MHz) 25–40 W Bipolar PCBs, Schematics, and Parts Lists511
  - 1.0 Allocation of Schematics and Circuit Boards511
  - 2.0 UHF Band 1 (403–470 MHz) 25–40 W Bipolar PCB 8480643Z06, Schematics, and Parts Lists513
    - UHF B1 25–40 W PCB 8480643Z06 Parts List†520
Section 10: UHF Band 2 (450–512/520 MHz) 25–40W Bipolar Service Information525
- Model Charts and Technical Specifications527
  - 1.0 UHF Band 2 (450–512/520 MHz) 25–40 W Bipolar Model Charts527
  - 2.0 Technical Specifications528
- Theory of Operation531
- Troubleshooting Charts539
- UHF Band 2 (450–512/520 MHz) 25–40 W Bipolar PCBs, Schematics, and Parts Lists545
  - 1.0 Allocation of Schematics and Circuit Boards545
  - 2.0 UHF Band 2 (450–512/520 MHz) 25–40 W Bipolar PCB 8480645Z04, Schematics, and Parts Lists547
    - UHF B2 25–40 W PCB 8480645Z04 Parts List†554
Section 11: VHF (136–174 MHz) 25–45 W LDMOS Service Information559
- Model Charts and Technical Specifications561
  - 1.0 VHF (136–174 MHz) 25–45 W LDMOS Model Charts561
  - 2.0 Technical Specifications562
- Theory of Operation565
- Troubleshooting Charts573
- VHF (136–174 MHz) 25–45 W LDMOS PCBs, Schematics, and Parts Lists581
Section 12: UHF Band 1 (403–470 MHz) 25–40 W LDMOS Service Information603
- Model Charts and Technical Specifications605
  - 1.0 UHF Band 1 (403–470 MHz) 25–40 W LDMOS Model Charts605
  - 2.0 Technical Specifications606
- Theory of Operation609
- Troubleshooting Charts617
- UHF Band 1 (403–470 MHz) 25–40 W LDMOS PCBs, Schematics, and Parts Lists625
Section 13: UHF Band 2 (450–512/520 MHz) 25–40 W LDMOS Service Information649
- Model Charts and Technical Specifications651
  - 1.0 UHF Band 2 (450–512/520 MHz) 25–40 W LDMOS Model Charts651
  - 2.0 Technical Specifications652
- Theory of Operation655
- Troubleshooting Charts665
- UHF Band 2 (450–512/520 MHz) 25–40 W LDMOS PCBs, Schematics, and Parts Lists671

Brand	Motorola
Model	Pro3100
Category	Two-Way Radio
Language	English

Motorola Pro3100 Detailed Service Manual

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