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August 16, 2007
6816985H01-B
6.1-10
VHF Troubleshooting Charts:
Volume Set Error Troubleshooting Chart
6.1.11 Volume Set Error Troubleshooting Chart
MAEPF-27336-O
No
No
No
Yes
Yes
Yes
Volume
Set Error
Using a voltmeter,
measure voltage at
R505 when volume
knob is on. The value
should be 3.0V.
Voltage
Functional?
Replace
U701
Verify contact
with circuit
board
Volume
check OK?
Refer to "No
Receive Audio"
flow chart
Verify operation
of volume knob
per "Button Test"
flow chart
Volume
pot OK?
Replace
Volume
Switch
This chart relates to a failure in the volume
set knob. Basic failure modes are as follows:
1) Bad connection
2) Defective volume control pot
3) Defective MAKO IC (U701)
4) Problem in receive audio circuit
Synopsis
Measure voltage from
C520 to GND while
moving volume knob
from min to max. Max
volume is 2.50V
Summary of Contents for ASTRO MT 1500
Page 4: ...iv Table of Contents August 16 2007 6816985H01 B Notes ...
Page 164: ...August 16 2007 6816985H01 B 5 6 Troubleshooting Procedures Operational Error Codes Notes ...
Page 188: ...August 16 2007 6816985H01 B 6 1 24 VHF Troubleshooting Charts Secure Hardware Failure Notes ...
Page 212: ...August 16 2007 6816985H01 B 6 2 24 UHF1 Troubleshooting Charts Secure Hardware Failure Notes ...
Page 236: ...August 16 2007 6816985H01 B 6 3 24 UHF2 Troubleshooting Charts Secure Hardware Failure Notes ...
Page 710: ...9 2 40 UHF1 Schematics Board Overlays and Parts Lists August 16 2007 6816985H01 B Notes ...
Page 806: ...9 5 32 900MHz Schematics Board Overlays and Parts Lists August 16 2007 6816985H01 B Notes ...
Page 816: ...Index 4 August 16 2007 6816985H01 B Notes ...
Page 817: ......