Operating instructions

39
TROUBLESHOOTING FLOW CHART #3B
(800/900MHz DC Switch)
REQ
Trouble
ILLUSTRATOR DATE
DESCRIPTION
LET
EDITOR DATE
SW
3/12/93
JWB
3/22/93
No R5/No T5
Voltage
at Q108,
Pin 4?
Voltage
at U202
Pin 1?
Check U102
VDC
U202-8
NO
YES
VDC
J301-2
VDC
U712-2
MAEPF-23443-O
0V
at Q108:
Pin 5 - RX
Pin 3 - TX
Check Continuity
Between U202-1
& Q108-4
Replace U202
Check
Jumper Flex
Replace U712 Replace Q703
Replace CR704
Replace
Control Flex
Replace
Jumper Flex
Replace Fuse
Replace P404
YES
NO
YES
NO
NO
YES
NO NO NO
YES YES YES YES
NO
NO
YES YES
VDC
U712-4
LOW = ON
VDC
Q703-1
HIGH = ON
VDC
J703-10
VDC
J703-8
VDC
J301-1, 20
VDC
P404-1
YES
YES