Door Latch - Bosch HBL 73 Service Manual

Tuesday, June 18, 2002
BOSCH 700 SERIES:
ELETTRODOMESTICI
SERVICE INSTRUCTIONS FOR OVEN TESTING AND BASIC TROUBLESHOOTING
VIA CHECCHI 98
I 21013 GALLARATE
ITALY
One of the heaters doesn't turn on. 1. Check connections between the heater and its relay on the Power

DOOR LATCH

The latch motors don't turn on.
DISPLAY The Display Board doesn't turn on,
no beep tone is heard at power-up.
The VFD display never turns on but
the Display Board seems to work
and accept commands (keypads,
Board.
2. If relay outputs don't work, replace the Power Board.
1. Check the connections between the motors and P10 on the Power
Board.
2. Check the P1B Display Board ó Power Board cable and refer to the
table to detect the heaters relay enable lines.
3. Replace the Power Board.
1. Check Power supply connection on the Power Board (P18 for double
oven, P5 for single oven).
2. Check the cable in the Display Board ó Power Board P1B table and
verify the communication lines between the two boards.
3. Check the cable in the Display Board ó Power Board P1A table and
verify the voltages. If voltage lines meet the values indicated in the
electric schematics then replace the Display Board.
4. If they don't meet, replace the Power Board.
1. Check the cable in the Display Board ó Power Board P1B table and
verify the VFD power supply lines.
2. Replace the Display Board.
knob).
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