R46 Circuit Diagram (11/15) - Oki OKIFAX4550 Maintenance Manual

4.8

R46 Circuit Diagram (11/15)

1. Block diagram
R46-PCB circuit diagram (11/15) shown the consists of the following function and connectors:
• IC7 (Send motor driver)
• TR505/TR506 (Clutch driver)
• Connector CN1 that provides an interface between R46 board and the send motor.
• Connector CN2 that provides an interface between R46 board and the clutch.
Figure A.26 (1/2) shows the related signals of the send motor and clutch.
Figure A.26 (2/2) shows the timing chart of send motor.
2. Function
1) Send motor rotation and chopper control
Send motor drive signals are generated by the IC2(IOGA6) and output to send motor via
IC7 (motor drive IC) of this circuit.
Note: The built-in motor control circuit of IC2(IOGA6) consists of the following blocks:
a)
b)
2) Clutch
When starting to print, performs the paper supply of recording paper by using this clutch.
Clutch is driven by clutch signal generated from CPU1.
41309401TH Rev.4
• Setting of the excitation operation
• Setting of the chopping operation
• Setting of the motor excitating method (1-2/2-1 phase excitation)
Send motor rotation control
There are several cases of the rotation operation:
Forward rotation for feeding documents.
• Case 1: Feeding document from hopper to the position where one line data is
read.
• Case 2: Feeding document while reading.
• Case 3: Feeding document after a page has been read.
Send motor chopper control
The purpose of chopper control is to reduce the current to the motor by setting the
phase signal on and off intermittently when a time lapse exceeding a specific time
occurs without a phase update.
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