Motorola Commercial Series Service-informatie - Pagina 21
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Troubleshooting Tables for Board and IC Signals (includes Controller, DC Regulation and Audio)
IC Designator
U451
ASFIC_CMP
U480
Dual Opamp
U490
Audio Power Amp
U510
Dual Opamp
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.
Pin
Pin Function
38
GCB5 general purpose output
39
RX audio send to option
40
Modulation output
41
RX audio out to power amp
42
Flat TX audio return from option
43
RX audio return to option
44
Flat TX audio send to option
45
Vdd for audio path I/O filters
46
Mic audio input
47
Ground for audio path I/O filters
48
Ext mic audio input (not used)
1
Unit 1 output
2
Unit 1 (-) input
3
Unit 1 (+) input
4
Ground
5
Unit 2 (+) input
6
Unit 2 (-) input
7
Unit 2 output
8
Vcc
1
Enable/shutdown
2
Bias reference
3
(+) input
4
(-) input
5
(-) output
6
Vcc
7
Ground
8
(+) output
1
Unit 1 output
2
Unit 1 (-) input
3
Unit 1 (+) input
4
Ground
5
Unit 2 (+) input
6
Unit 2 (-) input
7
Unit 2 output
8
Vcc
DC Voltage
Comments (Condition)
0
1.48
1.50
To U201-10
1.51
0.20
1.50
1.50
3.00
1.50
GND
0
2.48
2.48
2.46
GND
0.28
0.29
0
4.96
0.12
(Unsquelched)
3.26
(Unsquelched)
3.26
(Unsquelched)
3.27
(Unsquelched)
3.25
(Unsquelched)
7.48
(Unsquelched)
GND
3.29
(Unsquelched)
1.75
1.56
1.55
GND
1.55
1.56
1.38
4.96
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