Outline Of Electric Circuitry - Canon NP6317 Service Manual

CHAPTER 2 BASIC OPERATION
B.

Outline of Electric Circuitry

The NP-6317's main mechanisms are controlled by the microprocessor, PROM, and
EEPROM on the DC controller PCB.
1. Microprocessor (Q300)
• controls the copying sequence
• controls the control panel
• controls the main motor/scanner motor/mirror motor
• controls the scanning lamp/fuser lamp
• reads the analog signals
2. PROM (Q301)
• contains the sequence program
3. EEPROM (Q317)
• stores data that can be modified in the service mode (replaces conventional variable resistors
and switches)
Note:
EEPROM is a type of ROM in which data may be erased or stored newly.
For this reason, the NP-6317's RAM and RAM are not backed up by a lithium battery.
Note:
The NP-6317 is equipped with an A/D converter and, therefore, its microprocessor can read
analog signals.
Note:
The main motor (M1) is a brushless motor.
The scanner motor (M2) and mirror motor (M3) are stepping motors which use the oscillation
frequency of the crystal oscillator on the DC controller.
2-2
COPYRIGHT © 1999 CANON INC. CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)