Emerson EWD2004 Supplement Service Manual page 46

Main CBA Bottom View
CAUTION
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,
F REPLACE ONLY WITH THE SAME TYPE FUSE.
ATTENTION : POUR UNE PROTECTION CONTINUE LES RISQES
A V D'INCELE N'UTILISER QUE DES FUSIBLE DE MÊME TYPE.
RISK OF FIRE-REPLACE FUSE AS MARKED.
"This symbol means fast operating fuse."
"Ce symbole reprèsente un fusible à fusion rapide."
NOTE :
The voltage for parts in hot circuit is measured
using hot GND as a common terminal.
1-10-21
WF4 WF5
WF7 WF8
PIN 8 OF PIN 10 OF PIN 14 OF PIN 16 OF
CN1601 CN1601 CN1601 CN1601
CAUTION !
Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit.
If Main Fuse (F1001) 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.
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.
WF6 WF9
PIN 14 OF PIN 19 OF
IC1402 CN1601
MAIN CBA
Ref No.
IC301
IC451
IC501
IC571
IC751
IC1001
IC1002
IC1004
IC1201
IC1402
TRANSISTORS
Q031
Q052
Q055
Q056
Q057
Q301
Q302
Q303
Q391
WF10
Q421
PIN 2 OF Q422
Q425
TU701
Q426
Q501
WF11
Q506
PIN 6 OF
Q563
TU701 Q565
Q566
Q567
WF12
Q762
PIN 11 OF
Q763
TU701
Q1001
Q1003
Q1004
WF13
Q1005
PIN 12 OF
Q1006
TU701
Q1008
Q1011
Q1201
WF14
Q1202
PIN 14 OF
Q1204
TU701
Q1351
Q1385
Q2002
WF15
Q2013
PIN 18 OF
CONNECTORS
TU701
CL253
CL501
CL502
CL504
CL1001
CL1601
CL2003
VARIABLE RESISTORS
VR501
TEST POINTS
TP301
TP302
TP502
TP505
TP506
TP507
TP513
TP751
TP753
TP754
1-10-22 BH9600F01011A
Position
ICS
C-4
B-4
C-2
D-1
B-5
F-5
G-2
G-2
B-5
E-4
F-5
F-3
F-2
F-2
F-2
C-3
C-3
C-3
D-5
D-4
C-4
D-4
D-4
B-1
C-3
B-1
B-1
F-1
E-1
B-5
B-5
G-4
G-4
G-3
G-1
G-2
G-5
G-2
F-5
F-5
D-5
G-5
C-5
G-1
G-1
B-4
A-5
E-3
D-4
G-1
E-4
G-1
A-2
A-3
A-3
E-1
A-3
F-3
A-3
A-2
F-5
E-5
F-5