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Troubleshooting Table For Board And Ic Signals - Motorola Commercial Series Service Information
Uhf2 (438-470mhz)
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Also See for Commercial Series
:
Basic service manual
(100 pages)
,
Basic user's manual
(86 pages)
,
Selling manual
(66 pages)
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Troubleshooting
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3-6
4.0
Troubleshooting Table for Board and IC Signals
IC Designator
U51
IFIC
U52
BW Select Switch
Pin
Pin Function
1
RF input 44.85 MHz
2
RF input decoupling
3
2nd LO osc output
4
2nd LO osc input
5
RSSI output
6
Vcc
7
Audio feedback
8
Audio output
9
RSSI feedback
10
Quad detector input
11
Limiter output
12
Limiter decoupling 2
13
Limiter decoupling 1
14
Limiter input
15
Ground
16
IF amp output
17
IF amp decoupling 2
18
IF amp input
19
IF amp decoupling 1
20
2nd mixer output
1
Inverter 1 input
2
Inverter 2 output
3
Inverter 3 input (NU)
4
Ground
5
Inverter 3 output (NU)
6
Inverter 2 input
7
Inverter 1 output
8
Vcc
TROUBLESHOOTING TABLES
DC Voltage
Comments (Condition)
1.20
1.20
4.02
4.60
0.74
(no received signal)
4.70
0.89
1.44
DEMOD to stage U510
0.74
(no received signal)
2.22
1.25
1.30
1.30
1.28
GND
1.22
1.26
1.26
1.26
3.09
0
(25 kHz mode)
0
(25 kHz mode)
GND
GND
4.96
3.00
(25 kHz mode)
4.95
(25 kHz mode)
4.96
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Table of Contents
Troubleshooting
TROUBLESHOOTING TABLES
17
Troubleshooting Table for Synthesizer
19
Troubleshooting Table for Transmitter
20
Troubleshooting Table for Board and IC Signals
22
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