Emerson EWL20S5 Service Manual page 37

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.
CAUTION ! : For continued protection against risk of fire,
replace only with same type 4 A, 125V fuse.
4A/125V
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.
WF7 WF8
PIN 11 OF PIN 9 OF
CN103A CN103A
8-13
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.
WF9
PIN 7 OF
CN103A
MAIN CBA
WF10 Ref No. Position
ICS
Q704
E-4
IC31
Emitter
E-3
IC531
E-3
IC533
IC601 A-5
IC671 E-4
WF11
E-3
IC672
Q705
D-2
IC781
Emitter
IC801 D-5
IC851 D-2
IC852 E-2
TRANSISTORS
WF12
Q32 E-4
Q706
Q501 C-2
Q502 C-2
Emitter
Q503 C-2
C-4
Q505
Q509 C-3
Q510 C-3
C-2
Q511
Q512 C-2
Q513 C-3
Q531 C-2
Q601 B-5
B-5
Q603
Q633 A-5
Q701 D-2
D-2
Q702
Q703 D-2
Q704 E-1
Q705 E-1
Q706 E-2
E-2
Q707
E-2
Q708
Q802 E-5
Q803 D-5
CONNECTORS
E-1
CN113
CN411 B-2
CN801 E-5
A-5
CN802
CN101A C-2
CN102A D-2
WF6
CN103A D-2
PIN 14
TEST POINT
OF IC801 TP401 B-3
BL3100F01013-1