Troubleshooting/Adjustments - Kenwood TR-7625 Service Manual
2m fm transceiver
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Also See for TR-7625:
- Operating instructions manual (17 pages) ,
- Service manual (36 pages)
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TR-7625.
TROUBLESHOOTING/ADJUSTMENTS
Unlock indicator
Unit transmitter OK
.
Inspect RF 1st MIX circuit.
Inspect helical circuit.
Check adjustment of 1st IF circuit.
Check
10.245
MHz oscillator.
Little or no
.
D7 and D8 defective.
ON AARON
Little or no
:
noise
.
Check ceramic discriminator.
.
Check TR and IC in AF section.
. Check EXT SP jack.
No squelch function.
Normal
. Check TR, IC in AF circuit.
;
&
. Check ceramic discriminator circuit.
Sound distorted.
.
Check speaker.
.
Check for off frequency operation.
Normal
. Check adjustment of RF, tF coils and helical circuit.
.
Check output frequency.
ADJUSTMENTS
1. DC Power Supply
8. Audio Generator (AG)
Voltage:
Variable from 9 to 16V.
Frequency range:
300 Hz~5 kHz
Current:
8A min.
Output:
0.5mV~1V
2 DC VTVM or DVM
9. AF Voltmeter
Voltage range:
10V ~ 16V (min.)
Frequency range:
50 Hz~ 10 kHz
Input impedance:
1 MQ or better
Input impedance:
1 MQ min.
5. Oscilloscope
12. AF Dummy Load
With horizontal input and high sensitivity.
8Q 5W (approx.)
Frequency response:
3 MHz min.
13. Directional Coupler
21
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Table of Contents
Troubleshooting
