Motorola CP150TM User Manual
Page 181
6880309N62-C
June, 2005
UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals
11-15
U480
Dual Opamp
1
Unit 1 output
2.48
2
Unit 1 (-) input
2.48
3
Unit 1 (+) input
2.46
4
Ground
GND
5
Unit 2 (+) input
0.28
6
Unit 2 (-) input
0.29
7
Unit 2 output
0
8
Vcc
4.96
U490
Audio Power Amp
1
Enable/shutdown
0.12
(Unsquelched)
2
Bias reference
3.26
(Unsquelched)
3
(+) input
3.26
(Unsquelched)
4
(-) input
3.27
(Unsquelched)
5
(-) output
3.25
(Unsquelched)
6
Vcc
7.48
(Unsquelched)
7
Ground
GND
8
(+) output
3.29
(Unsquelched)
U510
Dual Opamp
1
Unit 1 output
1.75
2
Unit 1 (-) input
1.56
3
Unit 1 (+) input
1.55
4
Ground
GND
5
Unit 2 (+) input
1.55
6
Unit 2 (-) input
1.56
7
Unit 2 output
1.38
8
Vcc
4.96
1. All voltages are measured with a high-impedance digital voltmeter and expressed in volts DC relative to ground (0V).
2. Voltages are measured with a DC input voltage of 7.50 + .02 volts DC applied to the battery connector (J301).
3. All voltages are measured in the squelched receive mode, unless otherwise indicated.
4. Voltages are identical for VHF and UHF models unless otherwise indicated.
Table 11-4. Troubleshooting Table for Board and IC Signals (Continued)
IC Designator
Pin
Pin Function
DC Voltage
Comments (Condition)