Bosch HMV9302 Service Manual - Page 30

Checkout Procedures For Relay.

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Page 30 highlights

(2) CHECKOUT PROCEDURES FOR RELAY. - PROBLEM (A) FAN motor and oven lamp turn on without touching START key when the door is closed. NO YES GOOD Remove the mate connector of I/O CON from the circuit board. Does the unit still operate? NO YES Replace the circuit board Defective RELAY1 Replace RELAY1 - PROBLEM (B) FAN motor and oven lamp turn on When the door is closed and START key is touched. YES NO GOOD Measure the voltage at pin NO. 35 of U01 Voltage reading: 0 Vdc 10 of U03 Voltage reading: about 15V NO YES Replace the circuit board Defective RELAY1 or poor connection of RELAY1 7-19 Replace RELAY1 or correct the connection.

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7-19
(2)
CHECKOUT PROCEDURES FOR RELAY.
- PROBLEM (A) -
FAN motor and oven lamp turn on without touching
START key when the door is closed.
Remove the mate connector of I/O
CON from the circuit board.
Does the unit still operate?
GOOD
Replace the
circuit board
Replace
RELAY1
- PROBLEM (B) -
FAN motor and oven lamp turn on When the door is
closed and START key is touched.
Measure the voltage at pin NO.
35 of U01
Voltage reading: 0 Vdc
10 of U03
Voltage reading: about 15V
Replace the
circuit board
Defective
RELAY1 or poor
connection of
RELAY1
Defective
RELAY1
Replace
RELAY1 or correct
the connection.
NO
NO
YES
YES
NO
NO
YES
YES
GOOD