6881096C73-O June 11, 2003
Basic Troubleshooting: Receiver Troubleshooting 9-9
Radio Will Not
Squelch
Codeplug Check the offending channel for spurious activity
by monitoring with a known-good radio or service
monitor.
If possible, remove the offending source (computer,
etc.).
If not, increase the squelch level using the
appropriate radio-programming software.
Radio Will Not
Turn Off
On/Off Switch (Control
Head)
Check for SW_B+ at 0 Vdc on pin 17 J0401 on the
main board.
If SW_B+ is >1 Vdc, replace the control head.
Emergency Switch Check the emergency signal at J0401-18. A high
voltage may indicate that the emergency switch
line is not grounded by the rear accessory cable.
Main Board Refer to the Detailed Service Manual.
Excessive
Noise in Fading
Conditions
Check Programming for
Correct Bandwidth
Reprogram the codeplug with the correct
bandwidth.
Radio
transmiits when
programming
cable is
inserted into
control head
Damaged Flex Replace flex to control head.
Table 9-6. Receiver Troubleshooting Chart (Continued)
Symptom Possible Cause
Correction or Test (Measurements Taken
at Room Temperature)
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