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C - 6
SAFETY AND IMPORTANT WARNING ITEMS
2.
Protection by the hardware circuit
The output voltages from TH1 and TH2 (fixing
temperature sensor 2), TH3 (fixing temperature
sensor 3), and TH4 (fixing temperature sensor 4)
are compared with the abnormality judgement
reference value in the comparator circuit. If the
output voltage from TH1, TH2, TH3, or TH4
exceeds the reference value, L2, L3, L4, and RL1
are turned off in hardware means.
Caution: Periodically check the TH2 and
TH4 faces contacting the roller,
and replace TH2 and/or TH4 if
any abnormality is detected.
Do not change the gap between
the roller and each sensor TH2
and TH4. When replacing TH2 or
TH4, check the specified
mounting dimensions.
The RL1 function must not be
deactivated under any circum-
stances.
3.
Protection by TS1 (thermostat (upper))
and TS2 (thermostat (lower))
TS1 is turned off when the temperature of the
fixing roller (upper) exceeds the specified value,
and TS2 is turned off when the temperature of
the heating (upper) roller exceeds the specified
value, thus interrupting the power to L2 and L4
directly.
Caution: Do not use any other electrical
conductor in place of TS1 and
TS2.
4.
Protection by CBR2 (circuit breaker 2)
The CBR2 interrupts the AC line for L3
instantaneously when an excessive current flows
due to a short in the AC line.
Caution: The CBR2 function must not be
deactivated under any circum-
stances.
Di750Ver.3field2.p65
01/07/18, 11:34
6
Summary of Contents for DI750 - SERVICE
Page 1: ...L r 3 ...
Page 6: ...CONTENTS 1 ADJUSTMENT 2 ISW 3 SERVICE 4 ELECTRIC PARTS LIST Blank page ...
Page 20: ...1 ADJUSTMENT ADJUSTMENT 1 ...
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Page 124: ...1 103 OTHER ADJUSTMENT 1 ADJUSTMENT Blank page ...
Page 128: ...1 107 OTHER ADJUSTMENT 1 ADJUSTMENT Blank page ...
Page 162: ...1 141 OTHER ADJUSTMENT 1 ADJUSTMENT Blank page ...
Page 163: ...2 ISW ISW 2 ...
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Page 177: ...3 SERVICE SERVICE 3 ...
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Page 203: ...4 ELECTRIC PARTS LIST ELECTRIC PARTS LIST 4 ...
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Page 213: ...4 9 PARTS LAYOUT DRAWING 4 ELECTRIC PARTS LIST Blank page ...
Page 227: ...4 23 CONNECTOR LAYOUT DRAWING 4 ELECTRIC PARTS LIST Blank page ...
Page 233: ...4 29 JAM CODE LIST 4 ELECTRIC PARTS LIST Blank page ...
Page 246: ...4 42 JAM CODE LIST 4 ELECTRIC PARTS LIST Blank page ...
Page 276: ...4 72 ERROR CODE LIST 4 ELECTRIC PARTS LIST Blank page ...
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