Samsung DMT300 Series Training Manual page 40

Trouble Shooting
Error Type Error Mode
„Heavy‟ +
Heater Error
„Delicate‟ LED
Checking Method
1. Check the connections of the Heater connectors.
2. Check the resistance between both ends of the Heater.
: Check the resistance between both ends of the Heater
directly, or check
the resistance between the red wire of the Heater Relay
and the amber
and yellow wires of the Power Relay, respectively.
➢ Normal: Approx. 13Ω
Check after disconnect circuit breaker or power cable.
3. Check the connections of the Heater Relay.
: Check the voltage between the red wire of the Heater
Relay on the base and the yellow and amber wires of the
Power Relay.
➢ Normal: 120V (while operating)
4-1.Check the driving signals for the Heater Relay.
- Measure the voltage between pin 6 (amber) of the Main
PBA CN302 connector and pin 2 (red) of the CN302
connector.
➢ When the Heater is off: 9.5 to 12.5V
➢ When the Heater is operating: < 0.5V
Corrective actions
- Reconnect the Heater connectors.
- Faulty: Replace the Heater.
- Reconnect the Heater Relay connectors.
- Faulty: Replace the Main PBA assy.
- Normal: Replace the Heater Relay.
- Remove Retainer.
- Check voltage