at full capacity for 11 samplings (1.8
sec. duration) while the hot roller was
not rotating.
547 D
Zero cross signal malfunction
One of the following conditions is de-
tected 10 times:
When the main switch is on, the fre-
quency measured by the number of
zero cross signals for 500 ms is larger
than 66Hz or smaller than 45 Hz.
The interval between one zero cross
signal and the next is 7.5 ms or shorter
3 times consecutively for 500 ms.
• Noise on the ac power line
550 A
Fusing Web End
Web end detected 5 times within 500
ms and web motor continues to rotate
40 s. If web end is detected for another
500 ms, then the SC is logged.
• Web end (requires replacement)
• Web end sensor defective
• Note: After replacing the web with a new
one, reset SP1902 001 to "0" to release
SC550.
551 A
Fusing thermistor error 1
The end thermistor (contact type) was
less than 0C (32F) for more than 7 sec-
onds.
• Thermistor disconnected
• Thermistor connector defective
552 A
Fusing thermistor error 2
The end thermistor (contact type) could
not detect:
100°C 25 seconds after the start of the
warmup cycle.
A change in temperature more than
than 16 degrees for 5 seconds.
• Fusing lamp disconnected
• Thermistor bent, damaged
• Thermistor position incorrect
Service Mode
261
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