June, 2000
6880905Z99-O
9-9
GTX LTR/Privacy Plus 800 MHz Mobile Service Manual
Troubleshooting
Troubleshooting Charts
Troubleshooting Flow Chart
for Control Head
Start
Check controller.
Check LCD, U932,
Q953, and ZEBRA
connectors.
Check U941,
Q942-4,
D942-4.
Check R915-922,
R955, and R958.
Do the LEDs
light?
Check U942, and U970.
Is backlight OK?
Is volume OK?
Check U941, Q951,
Q952,D951-D970.
Is keypad
OK?
Is the display
on?
Is SPI
communication
OK?
End
Yes
No
Yes
Yes
Yes
No
Yes
Yes
No
No
No
No