Emerson Symphonic SC1304 Service Manual page 44

Main 4/5 Schematic Diagram
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 :
The voltage for parts in hot circuit is measured
using hot GND as a common terminal.
S3
S2
S1
1-8-9
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ONLY WITH SAME TYPE 4A, 125V FUSE.
ATTENTION: UTILISER UN FUSIBLE DE RECHANGE DE
4A/125V
MÊME TYPE DE 4A, 125V.
T3 U3
T2 U2
T1 U1
MAIN 4/5
Ref No. Position Ref No. Position
ICS TRANSISTORS
W-2 T-2
IC601 Q609
IC602 T-3 Q610 T-2
TRANSISTORS Q611 T-1
X-2 S-2
Q601 Q612
W-2 S-1
Q602 Q613
Q604 V-2 CONNECTOR
Q605 U-2 CN601 X-1
U-3 VARIABLE RESISTOR
Q606
Q607 U-2 VR601 V-2
Q608 T-2
V3 W3
V2 W2
V1 W1
1-8-10
VOLTAGE CHART (Power off mode)
Ref. No. 1 2 3 4
IC601 11.0 10.0 0 16.0
1 2 3
Ref. No.
IC602 3.0 0 1.8
S D G
Ref. No.
Q601 0 137.0 1.8
E C B
Ref. No.
Q602 0 3.2 0
Q604 6.7 9.9 7.8
Q605 0 7.9 0
Q606 8.9 8.8 8.2
Q607 0 0 0.7
Q608 0 3.0 0
Q609 5.8 8.2 6.5
Q610 0.9 5.6 1.4
Q611 0.1 3.0 0
Q612 5.1 5.1 1.9
Q613 0 3.0 0
X3
X2
X1
T5500SCM4