Motorola MTX series Theory/Troubleshooting Manual

47
TROUBLESHOOTING FLOW CHART #7B
(800/900MHz, Open Architecture, No Transmit Deviation)
REQUIRE
JE
Troublesho
ILLUSTRATOR EDATE
LETTERI
EDITOR DATE
SW
3/12/93
No TX Dev. Ext.
Check
Audio
14-J701
NO
YES
MA
Setup - Inject 80mV-1k
Signal into Ext. Mic. Path
Check Continuity
between Pin 14-J701
& Pin 3 J403
Check Continuity
between V Gnd
& MK401 = 2k
VDC
at MK401
and Gnd
Acoustic Couple
1k Tone to Int. Mic.
Check
Audio
B8-U701
Check Components
C713, C793, R207
Check
Audio
A7-U701
Check
Audio
U701-H8
Check
Audio
Pin 3 J301
Check
Audio
Pin 5 U204
Check Components
R703, R704, C712
Change U701
Replace Jumper Flex
Check Continuity
Between
Pin 3 J301 &
Pin 5 U204
Check
Audio
Pin 30 U204
Change U204
Check Components
C247, C246, R213,
C275, R211
Check
Audio
A6 - U701
Check
Audio
D3 - U601
Check
Audio
F3 - U601
Check
Audio
C7 - U701
Check Components
C614, C723, & C615
Change U601
Check C616
Change U701
INT
NO
NO
YES
YES
NO
YES HEARCLEAR ONLY
NO
YES
YES
NO
NO
YES
YES
NO
NO
YES
YES
YES
NO
NO
NO
JWB
3/22/93

Motorola MTX series Specifications

General

Brand	Motorola
Model	MTX series
Category	Portable Radio
Language	English