Motorola Gm Series Low Band Info Manual

Troubleshooting Flow Chart for VCO3-5
4.0 Troubleshooting Flow Chart for VCO 
Low or no RF Signal
           at U1051
Visual Check
of Board
OK?
8.5V DC
 Pin 3

3-6Low Band TROUBLESHOOTING CHARTS 

Chapter 4
LOW BAND PCB/SCHEMATICS/PARTS LISTS
1.0 Allocation of Schematics and Circuit Boards
1.1 Controller Circuits
The Low Band circuits are contained on the printed circuit board (PCB) which also contains the 
Controller circuits. This Chapter shows the schematics for the Low Band 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 Low Band circuit components. 
The...

4-2Low band pcb/schematics/parts lists
Table 4-3   LB3 25-60W Diagrams and Parts Lists
PCB :
8485908z03 Main Board Top Side
8485908z03 Main Board Bottom SidePage 4-31
Page 4-32
SCHEMATICS
Power Amplifier 25-60W (Sheet 1 of 2)
Power Amplifier 25-60W (Sheet 2 of 2)
Voltage Controlled Oscillator
Receiver Front End
IF (Sheet 1 of 2)
IF (Sheet 2 of 2)
Noise Blanker
FRACN
Page 4-33
Page 4-34
Page 4-35
Page 4-36
Page 4-37
Page 4-38
Page 4-39
Page 4-40
Parts List
8485908z03 Page 4-41
Controller version is T9...

Allocation of Schematics and Circuit Boards4-3
Table 4-5   LB2 25-60W Diagrams and Parts Lists
PCB :
8486207B07 Main Board Top Side
8486207B07 Main Board Bottom SidePage 4-51
Page 4-52
SCHEMATICS
Power Amplifier 25-60W (Sheet 1 of 2)
Power Amplifier 25-60W (Sheet 2 of 2)
Voltage Controlled Oscillator
Receiver Front End
IF (Sheet 1 of 2)
IF (Sheet 2 of 2)
Noise Blanker
FRACN
Page 4-20
Page 4-21
Page 4-22
Page 4-23
Page 4-46
Page 4-47
Page 4-26
Page 4-27
Parts List
8486207B07 Page 4-53
Controller version...

4-4Low band pcb/schematics/parts lists