COMPONENT CHECKOUT PROCEDURE RESULTS
Measure the resistance : Across two terminals with an
ohm-meter on its highest scale.
Normal reading :
Indicates continuity.
Abnormal reading :
Indicates infinite ohms.
Measure the voltage : Between test points TP-1,TP-2,TP-3,
TP-4, TP-5 and ground or between TP-6 and TP-7 (See
control circuit board on page 26 ).
NOTE
Proceed with the check of the step down transformer, to
see if any one of the measured values is different from the
specified values
Figure 10
-8-
HV FUSE
Test TP-1 TP-2 TP-3 TP-4
point
Voltage -5V -15V -30V -35V
DC DC DC AC
CONTROL
CIRCUIT
BOARD
COMPLETE
Measure the resistance between terminals of FPC
connector after removing it from S101. ( See Figure
11).
NOTE
- When reconnecting the FPC connector, make sure
the holes on the connector are properly inserted in
hooks of the plastic fastener in S101.
MATRIX CIRCUIT FOR TOUCH
KEYBOARD FPC CONNECTOR
TOUCH KEY
BOARD
TERMINALS OF FPC CONNECTOR
Figure 11
When When not
Resistance touched touched
Value
Less than More than
1K Ohms 1 MEG
Ω
When checking the "START" key, con-
nect Ohmmeter as illustration below.
T OP
A3
A4
A5
C1
C2
C3
A1
A2
C4
C5
Ohm-meter
1
2
3
4
5
6
7
8
9
10
Test TP-5 TP-6/
point TP-7
Voltage -29V 2.0V
DC DC
8
9
10
MICRO
POWER
WEIGH
DISH
BAKED
POTATO
SNACKS
FISH
ROAST
CHICKEN
AUTO
DEFROST
CONVEC.
TEMP
GRILL
MORE/
LESS
ROAST
MEAT JOINT
REHEAT
CAKE/
PUDDING
PIZZA
DUAL
START
CLEAR/
STOP
SLOW
COOK
CASSE-
ROLE
5
4
3
2
1
7
6
