Drum; Selenium Drum Drum Thermistor Unit Drum Heater Circuit; Charge; Corona Unit - Ricoh FT7770 Service Manual

DRUM

1. Selenium Drum
2. Drum Thermistor Unit
3. Drum Heater Circuit

CHARGE

1.

Corona Unit

2.

Corona Unit Ventilation

3.

Wire Cleaner

Charge Power Pack

4.

ERASE

1.

Introduction

Side Erase and leading/Trailing Edge Erase
2.
3. Erase Lamp Circuit
EXPOSURE
1. Introduction
2. Exposure Lamp Unit
3. Automatic Image Density Sensing
4. Lamp Regulator
5. Optics Cooling Fan
6. Anticondensation Heater
SCANNER DRIVE
1. Introduction
2. Scanner Motor Control
LENS AND MIRROR POSITIONG
1. Lens Positioning
2. Second Scanner Shift
3.
Lens/Mirror Position Initialization
DEVELOPMENT UNIT
1. Introduction
2. Drive Mechanism
3. Cross Mixing
4.
Knocking Solenoid
5. Toner Density Control
6. Image Density Control
7.
Bias for ID Sensing
8.
Bias Circuit
9. Development Drive Motor
TRANSFER AND SEPARATION
1. PTC (Pre-Transfer Corona) and PTL
(Pre-Trar]sfer Lamp)
2.
Image Transfer
3.
Paper Separation
4. TC/SC Wire Cleaner
5. Pick-off Pawls
6. PTC Power Pack and PTL Stabilizer
7.
Transfer/Separation Power Pack
CONTENTS
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-10
2-11
2-12
2-13
2-14
2-16
2-16
2-17
2-18
2-20
2-22
2-23
2-24
2-26
2-27
2-28
2-29
2-33
2-37
2-38
2-40
2-42
2-42
2-43
2-44
2-45
2-46
2-47