Repair manual

MT3855
1
DC DRIVE SYSTEM
POSSIBLE CAUSE(S) SUGGESTED REMEDY
Symptom #1 - Conveyor Belt will not run
 Oven in OFF mode.
 Loose computer controller cord connection.
 Time not programmed into computer.
 Emergency stop switch on OFF.
 Control circuit breaker tripped.
 Belt hooked on something in oven.
 5 amp line fuse blown.
 200 milliamp armiture fuse blown.
 Hall Effect Pickup not connected. (Closed loop
systems only)
 Motor brushes worn out.
 Defective conveyor drive motor.
 Defective conveyor drive motor controller.
 Wire from pickup open or misplaced.
 Turn to ON position.
 Adjust and retighten cables and set screws.
 Program in a cook time. See page 2 of the OperaĆ
tion section.
 Pull switch out to ON.
 Reset breaker.
 Turn oven OFF, unhook and repair problem.
 Replace fuse. Determine amp draw.
 Replace fuse. Determine amp draw.
 Verify the unit is set for a single pulse pickup. If
not, reset for a single pulse pickup. If yes reattach
the pickup.
 Replace brushes.
 Replace conveyor drive motor.
 Replace conveyor drive motor controller.
 Repair or replace wire.
Symptom #2 - Computer error code MOTOR Ć SPEED Ć ERROR
 Belt speed needs calibration.  See Calibration section page 6.
 Voltage from Bodine controller to DAC not presĆ
ent. The DAC (Digital Analog Control) is a nonĆreĆ
pairable component of the computer. There
should be approximately 20 VDC between the
red and green wires on the 3 pin connection of
the DC drive board.
 Replace the drive motor controller.
 DAC voltage is present but not regulated beĆ
tween 4.7 and .47 VDC when different times are
programmed into the cooking computer. MeaĆ
sure the voltage between the green and blue
wires of the 3 pin connection.
 Replace the computer.