Sharp LC-13SH1U Service Manual page 45

Main CBA Bottom View
CAUTION !
Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit.
If Main Fuse (F601) is blown, check to see that all components in the power supply
circuit are not defective before you connect the AC plug to the AC power supply.
Otherwise it may cause some components in the power supply circuit to fail.
NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD.
4A/125V
WF6 WF5
PIN 5 OF
PIN 3 OF
CN103A CN103A
8-21
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ONLY WITH SAME TYPE 4A, 125V FUSE.
ATTENTION: UTILISER UN FUSIBLE DE RECHANGE DE
MÊME TYPE DE 4A, 125V.
NOTE :
The voltage for parts in hot circuit is measured
using hot GND as a common terminal.
WF8
PIN 9 OF
WF4 WF9
CN103A
PIN 11 OF
PIN 1 OF
CN103A CN103A
WF7
PIN 7 OF
CN103A
BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER
SUPPLY CIRCUIT, AN ISOLATION TRANSFORMER MUST BE USED.
ALSO, IN ORDER TO HAVE THE ABILITY TO INCREASE THE INPUT
SLOWLY, WHEN TROUBLESHOOTING THIS TYPE POWER SUPPLY
CIRCUIT, A VARIABLE ISOLATION TRANSFORMER IS REQUIRED.
MAIN CBA
Ref No. Position
ICS
IC11 B-2
IC502 C-2
IC503 B-2
IC504 C-2
IC505 C-2
IC506 C-3
IC601 D-1
IC603 C-2
IC604 C-3
IC781 A-4
IC801 A-1
IC851 B-3
IC852 A-3
TRANSISTORS
Q31 B-3
Q401 D-4
Q403 D-4
Q404 D-5
Q405 D-5
Q406 E-5
Q407 E-5
Q408 D-5
Q409 E-4
Q410 E-5
Q411 D-4
Q412 E-5
Q415 E-3
Q416 D-3
Q419 E-5
Q420 D-5
Q421 D-5
Q422 E-4
Q423 E-4
Q424 E-4
Q425 E-4
Q426 D-4
Q427 D-3 VARIABLE RESISTOR
Q428 D-4
Q501 D-3
Q502 C-4
Q503 C-3
Q504 C-3
8-22
Ref No. Position
TRANSISTORS
Q505 E-1
Q507 C-2
Q508 C-2
Q509 C-3
Q511 C-4
Q512 C-2
Q513 C-2
Q514 C-3
Q515 C-3
Q516 C-3
Q517 D-3
Q601 D-1
Q603 C-1
Q633 E-1
Q701 B-4
Q702 A-4
Q703 B-4
Q704 A-4
Q705 A-4
Q706 A-4
Q707 B-4
Q708 B-4
Q709 A-2
Q802 B-1
Q803 A-1
CONNECTORS
CN101A C-4
CN102A C-4
CN103A B-4
CN104 D-5
CN401 E-5
CN402 E-4
CN403 E-3
CN404 E-2
CN801 A-1
CN802 E-1
VR601 D-4
TEST POINTS
TP300 A-5
TP401 D-3
BL0170F01011-1