Troubleshooting Charts; Transmitter - Midland Syn-Tech 70-342XL Service Manual

GENERAL TROUBLESHOOTING CHART
7 0 - 3 4 2 ~ ~ / 4 4 2 ~ ~
D i s t o r t e d ' ~ r a n s m i t a n d R e c e i v e
No T r a n s m i t T r a n s m i t
OK, C a n n o t Change
Audio Audio
C h a n n e 1
s
!I Confirm Scan Programmed i n E/PROM
and Scan k i t p r o p e r l y i n s t a l l e d
S e e M o d u l a t o r T r o u b l e -
s h o o t i n g C h a r t
I
R e c e i v e r i s o f f
F r e a u e n c v
I
S u b s t i t u t e
Low T r a n s m i t t e r
-
V o l t a g e R e g u l a t o r s E/PROM blodule
I I
blake s u r e E/PRObl Flodule
i s c o r r e c t l y i n s e r t e d o r
s u b s t i t u t e known good
module
R e c e i v e r
i s Dead
E r r o r Code 90
-
S u b s t i t u t e
E / P R O M
-
A
-
T r a n s m i t and R c c e i v c
O K
O u t p u t Power OK
o r 94 i s D i s p l a y e d
Module
Same lndication
L
A
D i s p l a y b l a n k o r i n c o r r e c t
S u b s t i t u t e
Same
Indication
Same Same
lndication
lndication
N o O u t p u t
Power
E
/
PROM
Module
Main VCO o u t o f l o c k
S e e T r a n s m i t t e r T r o u b l e -
- s h o o t i n g C h a r t Check R e c e i v e r
Chcck IC303
+8VDC S u p p l y
S q u e l c h O p e r a t i o n
OK
See CPU/PLL
T r a n s m i t t e r Of
A
T r o u b l e s h o o t i n g
:
-
Check IC 301
L
A
F r e q u e n c y C h a r t
-
and IC 302
1
Same Indication
r a n g e . Check VCO (TP701)
o r s u b s t i t u t e E/PROM
Module
OK
E r r o r 91, 9 2 , 93 o r 94
a r e CPU E r r o r Codes
I
R c c e i v e r S i g n a l
1)
I
s t o r t e d
Same
lndication
grammed i n t o E/Prom
S e e R e c e i v e r
T r a n s m i t , No RED
T r a n s m i t LED
-
- -
Confirm T r a n s m i t programmed
OK Check 4301
f o r s e l e c t e d c h a n n e l
-
and 4302
-
R e c e i v e OK b u t Cannot
T r o u b l e s h o o t i n g
C h a r t
g