20
LC-20SH4U
SUPPLEMENT
TROUBLE SHOOTING TABLE
Check the secondary
load of T7001.
Are pin (10) of IC1203
and IC1205 at "H"?
Check the load of
IC1203, IC1205 and its
peripheral circuits.
Is the primary
oscillation wave of
T7001 as specified?
Are the secondary
outputs of T7001 +5V,
-12V, +35V and +9V?
Is there DC 12V input at
T7701 and pin (8) of
IC7301?
Is the output voltage of
IC1203 and IC1205 as
specified?
Check the load of IC701
thru IC703.
Check T7701, IC7701
and their peripheral
circuits.
Check T7701, IC7701
and their peripheral
circuits.
Is there DC 18V input at
F6700 thru F6704?
Check the primary side
of T7001, IC7301 and
their peripheral circuits.
Disconnect F6700 thru
F6704. Is the load short-
circuited?
Check the related
line, IC1004 and its
peripheral circuits.
Is pin (187) of IC1004
at "H" or pulse?
Check the inverter unit
and fluorescent lamp,
and replace as required.
Check the primary side
of T7001, Q3305 and
their peripheral circuits.
Check the connections
between pin (4) of
SC2003 and pin (2) of
SC4201.
No video and audio output (no po
wer)
No fluorescent lamp light-up
No
No
No
No
No
No
No
No
No
Are F6700 thr
u F6704 as
specified?
Replace F6700 thru
F6704.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Chec
k the microprocessor's adjustment process men
u f
or wrong settings
.
Summary of Contents for LC-20SH4U
Page 25: ...27 LC 20SH4U SUPPLEMENT 26 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H OVERALL WIRING DIAGRAM ...
Page 26: ...29 LC 20SH4U SUPPLEMENT 28 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 1 5 ...
Page 27: ...31 LC 20SH4U SUPPLEMENT 30 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 2 5 ...
Page 28: ...33 LC 20SH4U SUPPLEMENT 32 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 3 5 ...
Page 29: ...35 LC 20SH4U SUPPLEMENT 34 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 4 5 ...
Page 30: ...37 LC 20SH4U SUPPLEMENT 36 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 5 5 ...
Page 31: ...39 LC 20SH4U SUPPLEMENT 38 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËSUB Unit 1 4 ...
Page 33: ...43 LC 20SH4U SUPPLEMENT 42 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËSUB Unit 4 4 ...
Page 34: ...44 6 5 4 3 2 1 A B C D E F G H LC 20SH4U SUPPLEMENT ËR C LED Unit ...
Page 36: ...47 LC 20SH4U SUPPLEMENT 46 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H MAIN Unit Side A ...
Page 38: ...51 LC 20SH4U SUPPLEMENT 50 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H MAIN Unit Side B ...
Page 40: ...55 LC 20SH4U SUPPLEMENT 54 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H SUB Unit Wiring Side ...
Page 53: ...69 LC 20SH4U SUPPLEMENT PACKING OF THE SET X3 X4 X5 X6 X2 X1 S2 S4 S3 S3 S5 S3 S3 S6 S1 X7 ...
