Sanyo EM-CD2900UK Service Manual page 8

COMPONENT COMPONENT
COMPONENT COMPONENT COMPONENT
Measure the resistance between
TOUCH KEY TOUCH KEY
TOUCH KEY TOUCH KEY TOUCH KEY
terminals of FPC connector after
BOARD BOARD BOARD
BOARD BOARD
removing it from S101.(Figure 10)
NOTE
‑When reconnecting the FPC connector,
make sure the holes on the connector
are properly inserted in hook of the
plastic fastener in S101.
MATRIX CIRCUIT FOR TOUCH KEY BOARD
FPC CONNECTOR FPC CONNECTOR
FPC CONNECTOR FPC CONNECTOR FPC CONNECTOR
Measure the resistance between the
Pin 1 and Pin 3 of connector S103
THERMISTOR THERMISTOR THERMISTOR
THERMISTOR THERMISTOR
after disconnecting it from the con‑
trol circuit board with an ohm‑meter
on the highest scale.
Measure the resistance after removing
UPPER HEATER UPPER HEATER
UPPER HEATER UPPER HEATER UPPER HEATER
the lead wires from the Upper heater
(850 W) (850 W) (850 W) (850 W) (850 W)
with an ohm‑meter on R x 1 scale.
Measure the resistance after removing
LOWER HEATER LOWER HEATER LOWER HEATER LOWER HEATER LOWER HEATER
the lead wires from the Lower heater
(400 W) (400 W)
(400 W) (400 W) (400 W)
with an ohm‑meter on R x 1 scale.
CHECKOUT PROCEDURE CHECKOUT PROCEDURE
CHECKOUT PROCEDURE CHECKOUT PROCEDURE CHECKOUT PROCEDURE
MATRIX CIRCUIT FOR TOUCH KEY BOARD MATRIX CIRCUIT FOR TOUCH KEY BOARD MATRIX CIRCUIT FOR TOUCH KEY BOARD MATRIX CIRCUIT FOR TOUCH KEY BOARD
2
A4
5
A5
8
A6
+10
A7
A8
A9
A
10
A1
When checking the Grill key,connect
ohm‑meter as illustration below.
1 0
4 3
6
7
9
A2 A3
Normal reading:
Normal reading:
‑ 7 ‑
RESULT RESULT RESULT
RESULT RESULT
When
touched
Resistance
Value
Less than
1K ohms
TERMINAL OF FPC CONNECTOR
Figure 10
Normal reading:
Approximately
1800K ohms @20℃
1400K ohms @25℃
Approximately 62 ohms
(Outside terminals)
Approximately 130 ohms
(Inside terminals)
When not
touched
More than
1M ohms
A1
A2
A3
A4
A5
A6
A7
A8
A9
A
10