Bosch HBL 73 Service Manual page 43

Tuesday, June 18, 2002
BOSCH 700 SERIES:
ELETTRODOMESTICI
SERVICE INSTRUCTIONS FOR OVEN TESTING AND BASIC TROUBLESHOOTING
VIA CHECCHI 98
I 21013 GALLARATE
ITALY
F125 UPPER OR SINGLE CANCEL KEY
CIRCUIT PROBLEM
F126 LOWER CANCEL KEY CIRCUIT
PROBLEM
F127 CANCEL KEY REDUNDANT
RETURN PROBLEM
F141 SLAVE MICRO NOT FUNCTIONING
F143 VCC OPEN CIRCUIT ON SLAVE
MICRO
F145 TEMPERATURE SENSOR INPUTS
SHORTED TOGETHER (DOUBLE
OVEN)
F147 GND OPEN CIRCUIT ON SLAVE
2. If OK, replace keyboard or Display Board or both.
1. Check all connections between keyboard (J1) and Display Board (P5).
2. If OK, replace keyboard or Display Board or both.
1. Check all connections between keyboard (J1) and Display Board (P5).
2. If OK, replace keyboard or Display Board or both.
1. Check all connections between keyboard (J1) and Display Board (P5).
2. If OK, replace keyboard or Display Board or both.
1. Check power and Display Board connectors P1B and associated wiring.
2. If OK, replace Power Board.
3. If fault persists, replace Display Board.
1. Check power and Display Board connectors P1B and associated wiring.
2. If OK, replace Power Board.
3. If fault persists, replace Display Board.
Replace Power Board.
Replace Power Board.
Page 12 of 28