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Sunday, 1 April 2018

BPL LCR 18CB 1 FAULT FINDING 1


Set Dead, AC Fuse F301 Blows off
wire, C301 (0.22MFd), line filter L301,
06 (ERCO5-10B x 4)
C303-0306 (1000pF/1KV), C307 (100MFd/450V)
degaussing coil, D303-D3
C 331 (470pF), Q313 (BU508AF) & related parts
Set Dead, No Output From Power Supply
ains wire, on-off switch SW301, AC Fuse F301
tne filter L301, R302 (560/7W), D303-D306
ERCO5-10B x 4), C307 (100MFd/450V), R320
R321 (120K), A322 (15K). D314 (1SS1553), A324A
(680/2W), R319 (220), C314 (0.1 MFd), 0317
(ES1), C317 (0.022MFd), Q312 (2SC3807), C315
(0.015MFd), R326 (2K2), R315 (22K), R317 (8200)
D316 (1SS1553), R314 (5K6), D312 (EU1), C311
(4.7MFd). D311 (6.2V-zener), 0311 (2SA1015) &
related parts, T311, check secondary side of T311
Only B1/130V Supply is Missing From
Power Supply White Other Supplies Are OK

Winding between pin no. 10-8 of T311 is open or
det., D351 (EU2A), C351 (470pF/2KV), C361
(220MF/160V), check B1/130V supply line for short.
Only B4/36V Supply is Missing From Power
Supply While Other Supplies Are OK
Winding between pin no. 12-9 of T311 is open o
def
(2S8764-E), R373 (1010, R372 (3K9), check for Standby
B6/12V, B7/BV, B9/5V Supplies Are Missing
From SMPS While Other Supplies Are OK

Winding between pin no. 13-8 of T311 is open or
def., D354 (EU2), C354 (470pF), C364 (2200MFd),
A369 (2.7 ), Q371 (25B764-E), R374 (10K), R371
(8200), D372 (1N4148), check for Standby, IC351
(AN78M12), IC352 (AN78MOB), C290-291 (470MFP),
check B6/12V,B7/8V & B9/5V supply lines for short.
Only B6/12V Supply is Missing From Powe
Supply While Other Supplies Are OK
IC351 (AN78M12), C290 (470MFd/16V), check
B6/12V supply lines for short.
Only 87/8V Supply is Missing From Power
Supply While Other Supplies Are OK
1C352 (AN78M08), C291 (470 MFd/16V), check
87/8V supply line for short.
Only B9/5V Supply is Missing From Power
Supply While Other Supplies Are OK

R324 (470Q/1W), D319 (5.1V-zener), C319
(47MFd), check B9/5V supply line for short.
Only B2/20V Supply is Missing
Winding between pin no. 14-9 of T311 is open or
def., D355A (EU2), C365 (2200MFd/25V), check
32/20V supply line for short.


Only Red Colour With Retrace Lines,
Sound Normal

CRT red cathode voltage will decrease
R614 (12K2w). 0611 (2SC2688) & reiated
components, VR611 (5K), VA612 (1K), fault in
circuit between pin no. 20 of IC101 & CRT red
cathode, IC101 (TDA8360) def., CRT red cathode
def., CRT base loose or faulty
Only Green Colour With Retrace Lines
Sound Normal

CRT green cathode voltage will decrease.
R624 (12K/2W), 0621 (2SC2688) & related
components, VR621 (5K), fault in circuit between
pin no. 19 of IC101 & CRT green cathode, IC101
(TDA8360) def., CRT green cathode def., CRT base
loose or faulty
Only Blue Colour With Retrace Lines,
Sound Norma

CRT blue cathode voltage will decrease
R604 (12K/2m), Q601 (2SC2688) & related
components, VA601 (5K), VR602 (1K), fault in
circuit between pin no. 18 of IC101 & CRT blue
cathode, IC101 (TDAB360) def., CRT blue cathode
det., CRT base loose or faulty
Qnly Secondary Colour Cyan,
Red Colour is Missing), Sound Normal

CRT red cathode voltage will increase.
R615 (3K3), Q61 1 (25C2688). C611 (820pF), R611
(3300), R612 (3K9), VA611 (5K), D611 (1N4148),
R613 (2K2), VR612 (1K), R284 (1002), fault in
circuit between pin no. 20 of IC101 & CRT red
cathode, IC101 (TDA8360) def, CRT red cathode
def., CRT base loose or faulty
Only Secondary Colour Magenta,
(Green Colour is Missing), Sound Normal

CRT green cathode voltage will increase.
R625 (3K3), Q621 (2S C2688), C621 (820pF), R621
(3302), R622 (3K9), VR621 (5K), D621 (1N4148),
R623 (2K2), R627(560Q), R285 (100Ω), fault in
circuit between pin no. 19 of IC101 & CRT green
cathode, IC101 (TDA8360) def., CRT green cathode
def, CRT base loose or faulty
Only Secondary Colour Yellow
(Blue Colour is Missing), Sound Normal

CRT red cathode voltage will increase.
R605 (3K3), Q601 (2SC2688), C601 (820pF), R601
(3300), R602 (3K9), VR501 (5k), D601 (1N4148)
R603 (1K), VA602 (1K), R286 (100), fault in circuit
between pin no. 18 of IC101 & CRT blue cathode
IC101 (TDA8360) def., CRT blue cathode def., CRT
base loose or faulty
 

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