AKAI 14CRM CIRCUIT DETAILS

SYSTEM CHROMA = TDA 11105PS/V3/3/AT2
MEMORY = 24C16
POWER = C4458
SMPS TRANSFROMER = BCK-39-73EC BCK-40-40271
EHT = BSC24-01N 4006EV
            BSC 25 N-01
            BSC 25 -N4006E
HOR O/P = DD5024
HOR OSC = KL UU 10.5-2 KE LIN-2
VERTICAL = LA 78040
AUDIO = UTC 2003
TUNNER = ET-5D511-B21
REMOTE = GBA
SERVICE MODE =

AKAI CT-20W9 fault finding 3

Tuning is Not Possible
Key for tuning is def, check key matrix circuil, no
cutput from pin no. 17 of IC T23A 1207, IC 723
1207 det,, R684 (1, C610 (320pF), C6
(0.1MFd), R101 (22K). C100 (33pF), R108 (4700
C108 (22MFd), C109 (0.1MFd), A102 (15k),
(2SC1815)
(0.022MFd), C104 (0.22MFd), tuner delecthe
alt
S5R103-R104-R105 (15K), C111-C112

No Storage Memory Pro
Key for Storage/Memory is def., check 5V supply
at pin no. 8 of IC ST24C04, C651-C652 (82pF)
R650-R651 (100O), R656-R657
ST24C04, IC 723A 1207 detective
(100

Sound Muting is Possible
Ney for Sound Mute is def,, no output from pin no.
16 of C 723A 1207, IC 723A 1207 def.. 35
(100pF). R630-R631 (10K) C61311 OMFd), R629
(47k), D601 (1N4148), c206 (10MFd), IC AN5265
& related components

External/Intenal Video Switching Problem
R003 (1000), Co06 (200MFd), R0D5-R006 (150)
Coo8-coo9 (47MFd), R004 (4KT), C010 (0MF
IC LA7952, R031-R030 (560 ). ???7 (47MFd.
IC301 (AN5195K-C), Video In/Out sockets

Exxternal/Internal Audio Switching Problem
O01 (1002), C001 (220MFd), R002 (15K, Co02
(10MFd), C003 (4.7MFd), Co04-C0o5 (10MFd)
R053-R051 (680Q), IC LA7016, IC301 (AN5195K
C), Audio In/Out sockets.

No Video Output
Col 4 (470MFd), R012 (220O), R014 (24K), ROI 3
(189, R008 (5.6O), CO02 (25C1815), ROI 5
(2702), Video-Out socket.

No Audio Output
R008 {220O), R007 (562), C011 (220MFd) Q001
(25C1815). Roos (2K7), ??12 (47MFd), R010
2202), Audio-Out socket.

No Sound, No Audio, Picture Normal
R403, C203, R205, C208, speaker, earphone lack,
C202, R201, C201, R603, R204, C204, C205,
C208, D601, R629, R630 R631, C631, check
Mute & Volume Contrcl circuits at System Cortrol
section, C207, R613, IC AN5265, C209, R206,
C210, R207, IC AN5195K-C & related parts

No Sound, Audio & Picture is OK
C304 & related parts, R319, R315. CF303, R353,
C322, R316, CF308, R362, C323, R313. R347
C391, C320, R113, C317, R387. IC AN5195K-C,
C390, R207, C210, A206, C20g, IC AN5265 &
related ccmponents

Only Red Colour With Retrace Lines
Sound Normal
CHT red cathode voltage will decrease
(10K), Q501 (2SC2482) & related components
D506-0501 (1N414B), fault in circuit between pr
no. 15 of IC301 & CRT red cathode,
(AN5195K-C), CRT red cathode defective, CH
base loose or faulty
ou
it between pin
IC301

Only Green With Retrace Lines
Sound Normal
509
CRT green cathode voltage will decrease.
(10K), 0502 (2SC2482) & related components
D507 D502 (1N4148), fault in circuit between pir
no. 17 of IC301 & CAT green cathode,
(AN5195-K),
base loose or faulty
CRT green cathode defective. CRT

Only Blue Colour With Retrace Lines
Sound Normal
CRT blue cathode voltage will decrease. R510
(10K), Q503 (2SC2482) & related components
D508-D503 (1N4148), tault in circuit between pi
no. 16 of IC301 & CRT blue cathode, IC301
(AN5195K-c), CRT blue cathode defective, CHT
base loose or faulty.

Only Secondary Colour Cyan,
Red Colour Missing), Sound Normal
CRT red cathode voltage will increase
R511 (2K7), 0501 (2SC2482), R514 (3K), C502
(270pF), R515 (5600), D506-D501 (1N4148).
R502 (470Q), R350 (150O), fault in circuit
between pin no. 15 of Ic301 & CRT red cathode
IC301 (AN5195K-C), CRT red cathode defective
CRT base ioose or faulty

Only Secondary Colour Magenta,
Green Colour Missing), Sound Normal
CRT green cathode voltage will decrease.
R512 (2K), Q502 (2SC2482), R516 (3K), C503
(270pF), R517 (5600). D507-D502 (1N4148),
R506 (470O), R349 (150O)
between pin no. 17 of IC301 CRT green
cathode, IC301 (AN5195K-C), CRT green cathode
defective, CRT base loose or fauty
in circuit

Only Secondary Colour Yellow,
Blue Colour Missing), Sound Normal
CRT blue cathode voltage will decrease
R513 (2K7), Q503 (2SC2482), R518 (3K), C504
(270pF), R519 (560n), D508-D503 (1N4148),
R504 (470n), R348 (1502). fault in circuit
between pin no. 16 of IC301 & CRT blue cathode.
C301 (AN5195K-C), CRT blue cathode defective,
CRT base icose or faulty

 

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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), ?417 (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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