Technical information

OPEWTIONSANDTIMING
b. Detection by Hardware
@ the SSR ON signa1 (SSR ON) identifies the
If the software detection mechanismfails to func-
activation of the heater despite the absence of
tion, the error AC shutoff relay (RLI) is turned OFF the heater drive signa1 (HTRD) generated by
under the following three conditions (A, B. C).
the microprocessor.
@
thescanning IampONdetection signa1 (LGHT)
@ the fixing temperature detection signa1 (TH)
leams that the scanning lamp remained ON
idenlifies overheating (about 230°C) of the
Fixing
temperalure -
detection signa1
SSR ON signal-
Heater drive -
signal
Scanning lamp-
ON signa1
, GHT
continuously (about 20 sec).
thermistor.
Error detecbon circuit
Figure 3-45b
COPYRIGHT 0 1992 CAHON IHC.
CAHIIH HPZWIL'MO RN.0 OEC. 1992 PRINTUI IN JAPAN [IMPRIME AU JAPONI
3-47b