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Sunday, 1 April 2018

AKAI CT-20W9 fault finding 2


TVVIDEO Switching is Not Possible
TVNIDEO key def., check key matrix circuit, no
output from pin no. 2 of IC 723A 1207, IC 723A
1207 defective, R652 (12K), IC LA7952 & IC
LA7016 & their related components
Volume Up/Dn is Not Possible
VOL+VOL- key def., check key matrix circuit, no
output from pin no. 9 of IC 723A 1207, IC 723A
1207 defective, R613 (1K), C207 (10MFd), IC
AN5265 & related components
Colour Up/Dn is Not Possible
Key for Colour Up/Dn is def., check key matrix
circuit, no output from pin no. 3 of IC 723A 1207
IC 723A 1207 delective, R653 (12K), C305
(0.01MFd), R306 (33K), R383 (10K), IC301
(AN5195K-C) & related components
Contrast Up/Dn is Not Possible
Key for Contrast Up/Dn is def., check key matrix
circuit, no output from pin no. 29 of IC 723A 1207
IC 723A 1207 def., R305 (10K), R359 (3K9), Q301
(2SC1815) & related components
No OSD While Functions are OK
0604 (2SC1815), C605 (390pF), R610 (15K)
R609 (2K7), R611 (10K), R617 (1K). no output
from pin no. 33, 34 & 35 of IC 723A 1207, IC 723A
1207 def., R638-R537 (1K5), R641 (4702), D603-
D604-D605 (1N4148), R018-R012-R023 (330a)
R022-R021-R024 (150), C311-C312-C313
(100pF), IC301 (AN5195K-C) & related parts.
Only Green OSD is Missing
 No output from pin no. 34 of IC 723A 1207, IC
723A 1207 def., R638 (1K5), D604 (1N4148)
R018 (3300), R021 (150), C312 (100pP), IC301
(AN5195K-C) & related components
Only Blue OSD is Missin
No output from pin no. 35 of IC 723A 1207, IO
723A 1207 def, R637 (1K5), D603 (1N4148)
R012 (3302), R022 (152), C311 (100KpF), IC301
(AN5195K-C) & related components
OSD Blanking Problem While Green &
Blue OSD & Functions Are OK

No output from pin no. 33 of IC 723A 1207, IC
723A 1207 def., R641 (4702), D605 (1N4148)
R023 (33002), R024 (15Q), IC301 (AN5195K-c)
Band Switching Problem
Key for Band selection is def., check key mati
circuit, no output from pin no. 10 & 12 of IC 723A
1207, IC 723A 1207 de., R618-R619 (3K3), R018
(4702), C108 (22MFd), C109 (0.1MFd), checl
supply at pin no. 6 & 9 of IC101, no output from pir
no. 1, 2 &7 of IC101, IC101 (AN5071), tuner,


No Colour or Abnormal Colour in Picture,
Black & White Picture & Sound is Normal

Antenna & wire, balun/adapter, adjust fine tuning
0305 (2SC1815) & related parts, R326 (1K8),
L301. a306 (2SC1815) & related parts, A325
(6800), R324 (1), Q309 (2SA1015), A343 (1K)
R364 (1000), C383A (33pF), C330 (10MFd), X301
(4.43MHz), C308 (10pF), X302 (3.57MHz), C309
(10pF), R304 (180K), c910 (4.7MFd), A358 (1 M)
C307 (68KpF), C306 (2.2MFd), R303-R302 (15K.
R306 (33K), R383 (10K), C305 (0.01MFd), R653
(12K), check Colour Control circuit at System
Control, C304 (47MFd), C303-C301 (22KpF)
C351-C350 (100KpF), L304, L306, C367-C366
(33pF), C382-C381 (82pF), C348-C346 (100KpF)
C349-C347 (100KpF), C353-0354 (100Kp)
C350 (10KpF), R345 (47K), C350 (1KpF), IC302
(MN3868), IC301 (AN5195K-C) & related parts
Horizontal Line, Sound Normal
Mininslze the brightness on the screen.
+20V supply to vertical output stage is missing
R426 (0.68Q), D405 (RU2), C430 (220pF), C429
(1000MFd), D405 (BYV52), C419 (100MFd), C424
(100KpF, vert. def. coil or its wire, C423
(1000MFd), R422 (1.50), VR401 (50K), R416
(22k), C422 (1MFd), R421 (1K2), R420 (35K)
R418 (39K), R419 (27K), C416 (1MFd), R415
(1K), R417 (1K2), C417 (220MFd), ZD401 (9.1V
zener), R438 (10K), Q403 (2SC1815) & related
parts, C420 (4K7pF), R423, VR402 (5K), R424
(620Q) : C AN5534. IC AN5195K & related parts
Height Less or Cinemascope Picture &/or
Vertical Non-Linearity in Picture &/or
Vertical Fold-Over Problem, Sound OK

Less or abnormal supply to vertical section, adjust
VR401 (50K), A426 (0.58s2), D405 (RU2), C430
(220pF), C429 (1000MFd), D405 (BYV52), C419
(100MFd, C424 (100Kp), C423 (1000MFd
R422 (1.50), R416 (22K), C422 (1MFd), R421
(1K2), R420 (35K), R418 (39K), R419 (27K), C416
(1MFd), R415 (1 K), R417 (1K2), ะก417 (220MFd),
ZD401 (9.1V-zener), R438 (10K), Q403
(2SC1815) & related parts, C420 (4K7pF), R423,
VR402 (5K), A424 (6200), IC401 (AN5534),
IC301 (AN5195K-C) & related parts, vert. def. coil.
AFC/AFT Problem
Q102 (2SC1815), C106 (1MFd), R106 (220K),
R114 (56K), D104 (1N4148), C114 (47MFd), R119
47K), R663 (1M), C699 (10MFd), D699 (1N4148)
D670 (1N4148), R664 (2K2), C604 (150pF), D671
1N4148), Q606 (2SC1815), R114A (120K), tuner
defective, R642 (20K), C622 (0.1MFd), R643
27K), IC 723A 1207, IC301 (AN5195K-C)
 


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