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 (100Ω), 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 ). СОС7 (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 (220Ω), R014 (24K), ROI 3
(189, R008 (5.6Ω), CO02 (25C1815), ROI 5
(2702), Video-Out socket.

No Audio Output
R008 {220Ω), R007 (562), C011 (220MFd) Q001
(25C1815). Roos (2K7), СО12 (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 (150Ω), 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 (470Ω), R349 (150Ω)
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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