Motorola ASTRO Digital Saber Service Manual page 105

No R5
U106 Pin 2
Voltage
YES
at U106
Pin 8?
NO
Less
YES
Replace than 4.8V
at U106
U106
Pin 3?
NO
Check L131,
Voltage L121 and CR109
YES
and L122 For
at Q107,
Pin 2? Open Connections
YES
5V at
Replace
U102
U102
Pin 1? NO
NO Check DC Power
Voltage
NO
Supply Failure
at Q107,
Pin 3?
YES
7.5V at
Replace
U202
YES
U202
Pin 8?
Voltage
NO
YES
Replace
at Q107,
Pin 4? Q107
•••••••••••••••••••••••••••••••••••••••••••••
YES
Less than
YES
Replace
4.8V at Q111
Q111
Pin 1 base?
YES
Replace
U202
NO
Replace
U102
5V at
YES
U102
YES
Pin 1?
5V at
NO
Pin 3
of U102?
NO
Voltage NO
at U202
Pin 8?
Check
conn. J1,
NO
YES
R101, and
header
good?
Replace U202
YES
Rectify
Go to
Chart C.26 Fault
MAEPF-24391-O
Chart 36 . VHF/UHF DC Switch
Chart C.5
No T5
Voltage
at Q111 Pin
3 collector?
NO
Voltage
at U202,
Pin 8?
NO
Check Fuse,
Flex Connection
J1-17, 19, 20;
Volume Switch
10-23