Midland 70-1341, Service Manual

Page: 32 / 68

SERVICING
70-1341/1344/1441/1444
4 - 8
YES
YES
NO YES
YES NO
NO
YES
YES
NO NO
YES
YES
RX
NO YES
Troubleshooting Chart 3 – 2 — Error Code Displayed
YES
YES
YES
NO
NO
YES
START
Error Code 1
Displayed?
DONE
Suspect IC901
Suspect Q707,
Q708, IC703 or
IC705
Suspect Q713,
Q714, Q715 or
Q716
TX 7 V at
Q713 pin
3?
1.5 V at VC
at test
frequency?
TX 7 V at
Q713 pin
6?
Has correct
data been
entered?
NO
Error Code 7
Displayed?
NO
NO
NO
YES
Error Code 3
Displayed?
YES
YES
NO NO
Q717, IC704
and IC705 OK?
Error Code
8 or 9
Displayed?
Error Code
2 or 4
Displayed?
No Backup
Data:
Check backup
power supply
Unplug and check
programmer or
cloning cables
Check path from
IC701 pin 7 to
IC901 pin 70
Enter correct data
Suspect connection
between IC901
and IC902
Error Code
3 in RX or
TX mode?
TX 8 V at
collector of
Q715?
TX
Q707,
Q708, IC703
and IC705
OK?
Suspect Q713,
Q714 or Q716
Suspect TCXO
X701
12.8 MHz at
IC701 pin 6?
Suspect Q701,
Q702, Q703,
Q704 or Q705
Suspect Q717,
IC704 or IC705
Suspect IC701 Suspect IC702
IC702 OK?
Charge
pump Q701
and Q702
OK?
If RX problem, check
D705 and Q706
If TX problem, check
D701 and Q706
NO
NO
IC701 OK?