Symphonic ST27S3, Руководство по обслуживанию

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FOCUS-VR
(UPPER SIDE)
SCREEN-VR
(LOWER SIDE)
VR661
+B ADJ
+B
TP601
15kHz
TP302
VR561
PCC
VR562
WIDTH
GND
TP300
AGC
TP301
Main CBA Top View
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.
NOTE :
The voltage for parts in hot circuit is measured
using hot GND as a common terminal.
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.
4A/125V
7-11
BL6600F01013-1
7-12
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.
MAIN CBA
Ref No. Position
IC31
B-1
IC111 D-2
IC151
E-2
IC401
D-3
IC481 E-3
IC551 B-2
IC601
C-4
IC802 E-4
Q31 C-1
Q111 D-2
Q321 C-1
Q411 E-2
Q441 D-3
Q481 F-2
Q531 B-2
Q532
A-2
Q551
B-2
Q552 B-2
Q553 B-2
Q561
C-2
Q571 B-4
Q572 C-3
Q601
B-5
Q602
B-5
Q641 D-4
Q662
D-4
Q671
D-4
Q675 D-4
Q676 D-4
Q681
D-2
Q682
D-3
Q683 D-2
Q696
D-4
Q825
D-4
Q831 D-3
Q832 D-3
Q833
E-4
CN571 B-3
CN691
D-5
CN801
E-1
CN802 E-4
WH301A C-2
WH501A A-3
TP300 A-1
TP301
A-1
TP302 A-3
TP591 A-3
TP592 A-3
TP601
A-4
VR561 B-2
VR562
B-2
VR661 B-2
ICS
VARIABLE RESISTORS
CONNECTORS
TEST POINTS
TRANSISTORS