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Section 7: 3-2 Troubleshooting Flow Chart for Receiver

6881091C63-F

1.1 Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)

IF Signal

at pin 2 of

U1051

RF Signal

at pin 3 of

U1051?

RF Signal at

C1017?

RF Signal at

C1013?

RF Signal at

C1002?

No or

Check harmonic filters J1401 and ant.switch

Check preselector and

RF amp.

Inject RF into J1401

Yes

Check RF amp (Q1001)

Stage.

Check filter between

C1017 & mixer U1051

Yes

Check for detailed

mixer.

Yes

1st LO level

OK?

Locked?

Yes

Check FGU

Yes

Trace IF signal

from C1036 to

Q1106. Check for

bad XTAL filter.

Yes

IF signal at

Q1106

collector?

Before replacing

U1103, check

U1103 voltages.

Yes

Is 9.3V

present?

Check Supply Voltage

circuitry. Check U0681,

U3211 and U0641.

Yes

weak RF

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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