Digital Analysis Test (Cont.) - Motorola MTH500 Service Manual

Troubleshooting
A
Use the GoNoGo
P AT S test for
"Flash_up "
(U403)
Did the
unit pass the
"Flash_up " test?
Test the backlight
by turning it on
Did the
backlight
turn on?
B
3 - 4

Digital Analysis Test (Cont.)

No
The Flash (U403)
Y e s
Note:
This test will be perform by TetraCom SW application.
Command: <BackL EN/DIS>.
No
Y e s
is defective.
Use the GoNoGo
P AT S test "IO_Loop "
(40 pin connector)
Did the "I/O_Loop"
test pass?
Y e s
Replace the
Keypad and LCD
Boards
Check beads E007,
No
E005, E006 and
40 pin connector
68P02963C70-O