Error Detection Circuit; Outline; Scanning Lamp Error Activation Detection Circuit - Canon NP6251 Service Manual

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H. Error Detection Circuit

1. Outline

Figure 6-109 is a block diagram showing the control circuit for the error detection
circuit, and the circuit has the following functions:
a. Monitoring the activation of the scanning lamp (LA1).
b. Monitoring the activation of the fixing heater (main, H1; sub, H2).
c. Monitoring the rotation of each motor in normal mode and in stream reading mode.
Each function concentrates at the gate array on the DC controller PCB.
The gate array detects the state of each appropriate load used for the detection of
an error, checks for the presence/absence of an error, and communicates the result to
the master CPU.

2. Scanning Lamp Error Activation Detection Circuit

The gate array receives the scanning lamp ON signal (CVRON) and the scanning
lamp ON detection signal (CVR ACTIVE). If the scanning lamp is on in the absence of
the scanning lamp ON signal, the gate array will identify an error.
At this time, the gate array will communicate to the master CPU the wrong detection
and, at the same time, generates the power supply OFF signal.
COPYRIGHT © 1997 CANON INC.
Download service manual and resetter printer at http://printer1.blogspot.com
Lamp
regulator
PCB
LA1
AC
driver
PCB
H1
H2
PS4
RF
Motor
error
M3
M3
detection
PCB
Figure 6-109
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 FIXING SYSTEM
DC controller PCB
Gate
Master
array
CPU
6-15

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