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Remove dust cover from the gearmotor and inspect the coupling and encoder disc. The coupling set screws should be tight and not slipping on the motor shaft or the tach. generator shaft. The encoder disc should be firmly attached to the coupling and not warped. Check the positioning of the optical encoder disc. The disc should not be touching the optical encoder assembly and the encoder assembly should be mounted so it is squarely facing the coupling shaft. This is to allow the infrared beams to be broken by the encoder disc. If all this is okay, then replace the optical encoder assembly. Time Display inaccurate, erratic, or inoperative(S/N Q19078 & Above1000 Series) (S/N Q14791 & Above1200 Series) Conveyor Drive (Stepper) Control Perform all checks as in the above evaluation. If the time check is okay, refer to the next section. Check to see if the conveyor drive (stepper) motor is running. If motor is not running, refer to "Conveyor will not run" on page 43. Magnet Check to insure that the magnet (cemented to shaft of conveyor drive (stepper) motor) has not been damaged, or come loose from motor shaft. Replace as needed. Hall Effect Sensor Check for any physical damage to Hall Effect sensor (mounted on conveyor drive(stepper) motor). Check all wiring and connections for damage. Conveyor Drive (Stepper) Control Check all connections for tightness or proper location and check all wiring for visible damage. Replace as needed. If there is still no time display, wire in (temporarily) a new conveyor drive control. If there is still no time display, reconnect original conveyor drive control. Replace Hall Effect Sensor. Impinger I -–1000 Series Service Manual -International TROUBLESHOOTING / GAS OVENS 1033, 1034, 1046, 1047 SYMPTOM POSSIBLE CAUSE EVALUATION Oven fan will not run Incoming Power Supply Check breaker/reset if required. Call Power Company if needed. In these ovens, there is a control circuit step-down transformer. This transformer steps down supply voltage to 120 VAC. If main fan will not run, the secondary of this transformer must be checked for 120 VAC output. Check specific oven model schematic for circuit location. Transformer Fuse Check and/or replace. Fuseholder Check and/or replace. Fan Switch Check continuity between switch terminals. Oven Start Relay Check for 120 VAC to the relay coil. If voltage is not present, trace wiring back to the fan switch. If voltage is present, check to insure contacts are closing. 20 Minute Time Delay Check for 120 VAC at terminal #1 to neutral on the 20-minute timer. If no voltage is present, trace wiring back to the power supply. If voltage is present at terminal #1, check for 120 VAC at terminal #2 to neutral. If no voltage is present, and the oven start relay is closed, replace the 20minute timer. Oven Fan Relay Check for 120 VAC to coil of the oven fan relay. If no voltage is present, trace wiring back to terminal #2 of the 20-minute timer. Check for 120 VAC at terminals #2 and 6 of the relay, if no voltage is present, trace wiring back to the power supply. If voltage is present at the relay coil, check to insure the contacts are closing. Fan Fuse Check, replace if necessary. Fuseholder Check, replace if necessary. Capacitor Check for opens, shorts, or grounds. Motor Check for opens, shorts, or grounds. WITH POWER OFF: turn the fan blade to check for locked rotor. No main fan cool down 20 Minute Time Delay Check for 120 VAC at terminal #2 to neutral while oven is "on". Turn off the main fan switch, 120 VAC should continue to be present for 20 minutes. If voltage is not present for approx. 20 minutes, replace the timer. Oven Fan Relay Check if relay is operating and that the contacts remain closed during the 20 minute cool down. Main fan runs after 20 minute cool down Oven Start Relay Contacts should open when main fan switch is turned off. 20 Minute Time Delay 120 VAC at terminal #2 should discontinue approximately 20 minutes after main fan is switched off. If the oven start relay contacts are open, and the voltage continues at terminal #2 of the 20 minute timer, replace the timer. Oven Fan Relay Check to insure that the contacts are opening after the coil is de-energized. No control box cooling Fan Switch Oven Start Relay20 Minute Time Delay Oven Fan Relay Cooling Fans (SEE MAIN FAN WILL NOT RUN) 120 VAC should now be at this motor. If voltage is present, check motor for shorts, opens, or grounds. WITH POWER OFF: check for locked rotor. Impinger I -–1000 Series Service Manual -International No automatic control box cooling Cooling fan continues to run after 20 minute cool down Oven will not heat Incoming Power Supply Fuse Transformer Fuseholder Cooling Fan Thermostat Cooling Fan Cooling Fan Thermostat Gas Supply Manual Gas Shut-off Valve Fan Switch Main Oven Fan Oven Start Relay Burner Switch Air Pressure Switch Gas Pressure Switch Hi-Limit Thermostat Ignition Control Burner Blower Motor Burner Blower Motor Air Pressure Switch Check circuit breakers, reset i...

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