Motorola Gm Series Detailed 6864115b62 B Manual

UHF 25-40W Band1 PCB 8486127z01 / Schematics4-39
9
G
G GG G
G 4802245J84
NOTPLACED 2113740L30  33pF
L31249180469V03
0.75VDC
0.75VDC3VDC
NOTPLACED
2113740F35  22pF Y3101 4880606B09
20/25kHz  5VDC 12.5kHz  0VDC
3.9VDC
fundamental xtal 3rd overtone xtal
R3123 0662057B47  0 NOTPLACED
R3124 NOTPLACED 0662057A49 1K
C3124
2462587N68  1uH
C3136 2113740L29 30pF9180469V04
9180468v04
9180469V06
9180468V06
3VDC
0.1uF C3139 VDD14
VSS
7
Q3141
MC74HC4066U3111-1
CNTL131 2
R3116
330
82pF C3112
10 R3112
1.8K R3142R3154...

4-40UHF 25-40W Band1 PCB 8486127z01 / Schematics5.1 UHF PCB 8486127Z01 Parts List 
25-40W (LDMOS) 
Circuit 
RefMotorola 
Par t No.DescriptionC3101
2113740F34
20pF
C3102 2113740F31 15pF
C3103
2113740F39
33pF
C3104 2113743E20 0.1uF
C3110
2113740F37
27pF
C3111 2113743E20 0.1uF
C3112
2113740F49
82pF
C3114 2113740F33 18pF
C3115
2113740F35
22pF
C3116 2113743E20 0.1uF
C3121
2113743E20
0.1uF
C3122 2113743E11 0.039uF
C3123
2113743E11
0.039uF
C3124 2113740L30 33pF           3rd overtone xtal
C3124
NU...

UHF 25-40W Band1 PCB 8486127z01 / Schematics4-41C4495
2113741A21
1000pF
C4496 2111078B08 6.2pF
C4497
2113741A21
1000pF
C4498 2111078B08 6.2pF
C4499
2113740F51
100pF
C4502 2113743E01 0.012uF
C4503
2113741F17
470pF
C4504 2113741F49 10nF
C4505
2311049A07
1uF
C4506 2113741F33 2200pF
C4507
2113740F51
100pF
C4510 2111078B31 36pF
C4521
2113740F51
100pF
C4522 2113741F25 1000pF
C4602
2113741A57
0.033uF
C4629 2113740F51 100pF
C4630
2113743E20
0.1uF
C4631 2113743E20 0.1uF
C4632
2113740F51
100pF
CR4301 4805649Q13...

4-42UHF 25-40W Band1 PCB 8486127z01 / Schematics
*  Motorola Depot Servicing only
Reference designators with an asterisk indicate 
components which are not fieldreplaceable 
because they need to be calibrated with 
specialized factory equipment after installation. 
Radios in which these parts have been replaced in 
the field will be off frequency at temperature 
extremes.
R4347
0662057B47
0
R4360 0662057A35 270
R4361
0662057A31
180
R4362 0662057A01 10
R4363
0662057A49
1K
R4381 0662057A41 470
R4401...

 Professional Radio
GM Series
UHF (403-470MHz)
Service Information
Issue: August 2002 

ii
Computer Software Copyrights
The Motorola products described in this manual may include copyrighted Motorola computer programs stored 
in semiconductor memories or other media. Laws in the United States and other countries preserve for 
Motorola certain exclusive rights for copyrighted computer programs, including the exclusive right to copy or 
reproduce in any form, the copyrighted computer program. Accordingly, any copyrighted Motorola computer 
programs contained in the Motorola products described...

iii
Table of Contents
Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS
1.0 GM140/GM160 Model Chart ................................................................................ 1-1
2.0 GM340/GM360/GM380 Model Chart ................................................................... 1-1
3.0 GM640/GM660/GM1280 Model Chart ................................................................. 1-2
4.0 Technical Specifications...

iv
Chapter 3 TROUBLESHOOTING CHARTS
1.0 Troubleshooting Flow Chart for Receiver (Sheet 1 of 2) ..................................... 3-1
1.1 Troubleshooting Flow Chart for Receiver (Sheet 2 of 2) ..................................... 3-2
2.0 Troubleshooting Flow Chart for 25W Transmitter (Sheet 1 of 3) ......................... 3-3
2.1 Troubleshooting Flow Chart for 25W Transmitter (Sheet 2 of 3) ......................... 3-4
2.2 Troubleshooting Flow Chart for 25W Transmitter (Sheet 3 of 3)...

Chapter 1
MODEL CHART AND TECHNICAL SPECIFICATIONS
1.0 GM140/GM160 Model Chart
GM Series UHF 403-470 MHz
Model Description
MDM25RKC9AN1_EGM140, 403-470 MHz, 25-40W, 4 Ch
MDM25RKF9AN5_E GM160, 403-470 MHz, 25-40W, 128 Ch
MDM25RHC9AA1_EGM140, 403-470 MHz, 1-25W, 4 Ch
MDM25RHF9AA5_E GM160, 403-470 MHz, 1-25W, 128 Ch
Item Description
XXGCN6112_Control Head GM140
X X GCN6120_ Control Head GM160
XIMUE6012_Tanapa, GM140
X IMUE6012_ Tanapa, GM160
XIMUE6021_Tanapa, GM140
X IMUE6021_ Tanapa, GM160...

1-2 MODEL CHART AND TECHNICAL SPECIFICATIONS
2.0 GM340/GM360/GM380 Model Chart
GM Series UHF 403-470 MHz
Model Description
MDM25RHC9AN1_EGM340, 403-470 MHz, 1-25W, 6 Ch
MDM25RHF9AN5_E GM360, 403-470 MHz, 1-25W, 255 Ch
MDM25RHC9AN8_EGM380, 403-470 MHz, 1-25W, 255 Ch
MDM 25 RH A9A N0_E   Datab ox, 4 03-4 70  MHz,  1-2 5W , 16  Ch
Item Description
XGCN6112_Control Head GM340
X GCN6120_ Control Head GM360
XGCN6121_Control Head GM380
X GCN6116_ Databox Radio Blank Head
XIMUE6015_SField Replaceable Unit (Main...