Code :

Code: SC542-03
Description: Fusing central thermopile does not reload • Time out (Non-rotating roller): Reload temperature not reached in 28 seconds after the fusing lamp control start • Time out (Rotating roller): Reload temperature not reached in 46 seconds after the fusing lamp control start
Causes: • Disconnection of the fusing lamp • After excessive temperature rise prevention unit operation
Remedy: • Check the fusing thermistor is set correctly. • Replace the fusing thermistor. • Check that the input voltage is within acceptable limits. • Replace the fusing unit. • Repace the BCU. • Replace the fusing lamp in the case of disconnection.

Code: SC543
Description: Fusing overheat error 1 (center) The fusing thermistor detected a fusing temperature over 230°C for 1 sec. at the center of the hot roller.
Causes: • TRIAC short on PSU (PSU defective) • BCU defective • Power supply voltage unstable
Remedy: • Replace the PSU. • Replace the BCU. • Replace the fusing unit.

Code: SC544
Description: Fusing overheat error 2 (center) A fusing temperature over 250°C is detected at the center of the hot roller by the fusing temperature monitor circuit in the BCU board. The power was interrupted for more than 0.3 sec.
Causes: • TRIAC short on PSU (PSU defective) • BCU defective • Fusing thermistor defective • Power supply voltage unstable
Remedy: • Replace the PSU. • Replace the BCU. • Replace the fusing unit.

Code: SC545
Description: Fusing overheat error 3 (center) After warmup, the center of the hot roller attained full operating temperature and maintained this temperature for 29 sec. without the hot roller rotating.
Causes: • Center hot roller thermistor installed incorrectly, disconnected. • Center hot roller thermistor defective
Remedy: • Check the hot roller thermistor is set correctly. • Replace the hot roller thermistor. • Replace the BCU. • Check that the input voltage is within acceptable limits. • Replace the fusing unit. • Replace the fusing lamp in the case of disconnection.

Code: SC547-01
Description: Zero cross error (relay-contact soldering) The zero cross signal is detected for 0.05 seconds three times even though the fusing lamp relay is off when turning on the main power.
Causes: • Fusing relay damage (contact open) • Fusing relay drive circuit fault • PSU fuse (24VS) blowout
Remedy: • Turn the main power supply switch OFF/ON. • If the fusing relay is damaged, replace the PSU. • Check the connection between PSU and control board, and replace harness and board if necessary. • If the PSU fuse (24VS) blows out, replace the PSU.

Code: SC547-02
Description: Zero cross error (relay contact fault) The zero cross signal is not detected for 3 seconds even though the fusing lamp relay is on after turning on the main power or closing the front door.
Causes: • Fusing relay damage (contact open) • Fusing relay drive circuit fault • PSU fuse (24VS) blowout
Remedy: • Turn the main power supply switch OFF/ON. • If the fusing relay is damaged, replace the PSU. • Check the connection between PSU and control board, and replace harness and board if necessary. • If the PSU fuse (24VS) blows out, replace the PSU.

Code: SC547-03
Description: Zero cross error (low-frequency error) • In the event of an error
Causes: • Fusing relay damage (contact open) • Fusing relay drive circuit fault • PSU fuse (24VS) blowout
Remedy: • Turn the main power supply switch OFF/ON. • If the fusing relay is damaged, replace the PSU. • Check the connection between PSU and control board, and replace harness and board if necessary. • If the PSU fuse (24VS) blows out, replace the PSU.

Code: SC547-04
Description: Zero cross error (input signal error) • In the event of an error
Causes: • Fusing relay damage (contact open) • Fusing relay drive circuit fault • PSU fuse (24VS) blowout
Remedy: • Turn the main power supply switch OFF/ON. • If the fusing relay is damaged, replace the PSU. • Check the connection between PSU and control board, and replace harness and board if necessary. • If the PSU fuse (24VS) blows out, replace the PSU.