Minolta Di251 Service Manual page 338

C0650,C0651
Step
1 Scanner Motor operation check: Select func-
tions in the following order: Tech. Rep. Mode
Movement Check
"Relative Position" and touch "Set"; the Scan-
ner moves at this time.
2 The Scanner can be moved manually.
3 "C0651" is displayed.
4 Scanner Home Position Sensor 1 operation
check through I/O check
5 Scanner Home Position Sensor 1 operation
check: the voltage across CN11BCR-1 on BCR
Board and GND is DC0 V when the sensor is
blocked and DC5 V when the sensor is
unblocked.
6 Scanner Home Position Sensor 1 operation
check: the voltage across CN1BCR-26 on BCR
Board and GND is DC0 V when the sensor is
blocked and DC5 V when the sensor is
unblocked.
7 Scanner Home Position Sensor 2 operation
check through I/O check
8 Scanner Home Position Sensor 2 operation
check: the voltage across CN12BCR-1 on BCR
Board and GND is DC0 V when the sensor is
blocked and DC5 V when the sensor is
unblocked.
9 Scanner Home Position Sensor 2 operation
check: the voltage across CN1BCR-27 on BCR
Board and GND is DC0 V when the sensor is
blocked and DC5 V when the sensor is
unblocked.
Check
Scanner; set "+1000" in
T-40
Result Action
YES Check step 3 and onward.
YES Change Scanner Motor.
Change BCR Board.
Change MFB2 Board.
Change Master Board.
NO Correct drive coupling.
YES Check step 7 and onward.
YES Check to see if Scanner
Home Position Sensor 1 is
blocked as the Scanner is
moved. If it is checked
okay, change Master
Board.
NO Change Scanner Home
Position Sensor 1.
YES Change BCR Board.
NO Change MFB2 Board.
Change Master Board.
YES Check to see if Scanner
Home Position Sensor 2 is
blocked as the Scanner is
moved. If it is checked
okay, change Master
Board.
NO Change Scanner Home
Position Sensor 2.
YES Change BCR Board.
NO Change MFB2 Board.
Change Master Board.