Bosch HMV9302 Service Manual - Page 32

Problem - A, Problem - B, Trouble Shooting

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Page 32 highlights

C. TROUBLE SHOOTING Before following this troubleshooting read TRIAL OPERATION on page 6-1. ¥ DISPLAY Problems, A thru C ¥ HELP UP Problems, D thru E ¥ BUZZER Problems, F PROBLEM - A: PLEASE SET TIME OF DAY does not appear in display window when power supply cord is plugged into wall outlet. 1 Check: 1. POWER SUPPLY 2. FUSE (See CHECKOUT PROCEDURES FOR FUSE BLOWING: on page 7-18) 3. OVEN CAVITY THERMOSTAT 7-21 0 120 120V Replace Normal Runs circuit board circuit board WH RD 0 120 Measure voltage between pin 1 and pin 3 of connector CN1. Voltage Correct Normal Runs incorrect connections resistance PROBLEM - B: Display does not show correct numbers and/or correct indications when programmed. 1 Contact Replace Normal Runs ok circuit board circuit board Normal resistance Check contact of connector S1 Poor Correct Normal Runs contact seating contact Measure resistance of touch key board after removing connector S1. (See page 7-4 and 7-17) Runs Resistance incorrect Replace touch key board. Normal touch key board

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7-21
PROBLEM - A:
PLEASE SET TIME OF DAY does not appear in display window when power supply cord
is
plugged into wall outlet.
PROBLEM - B:
Display does not show correct numbers and/or
correct indications when programmed.
Check:
1.
POWER SUPPLY
2.
FUSE (See CHECKOUT PROCEDURES FOR FUSE BLOWING: on page 7-18)
3.
OVEN CAVITY THERMOSTAT
1
1
C.
TROUBLE SHOOTING
Before following this troubleshooting read TRIALOPERATION on page 6-1.
¥ DISPLAY Problems, A thru C
¥ HELP UP Problems, D thru E
¥ BUZZER Problems, F
Measure voltage between pin 1
and pin 3 of connector CN1.
Measure resistance of touch
key board after removing
connector S1.
(See page 7-4 and 7-17)
120V
Replace
circuit board
Normal
circuit board
Normal
resistance
Voltage
incorrect
Normal
resistance
Resistance
incorrect
Replace touch
key board.
Normal touch
key board
Poor
contact
Correct
seating
Contact
ok
Replace
circuit board
Normal
circuit board
Normal
contact
Check contact
of connector S1
Correct
connections
0
120
WH
RD
Runs
Runs
Runs
Runs
Runs