Introduction; General Precautions; How To Use This Book; Reading The Text - Minolta CF910 Service Manual

1

INTRODUCTION

1-1.

General Precautions

1. When servicing the copier with its covers removed, use utmost care to prevent your
hands, clothing, and tools from being caught in revolving parts including chains and
gears. When checking copier operation with the Rear Cover removed, be sure to install
the jig.
2. Before attempting to replace parts or unplug connectors, make sure that the power cord
of the copier has been unplugged from the power outlet.
3. Never create a closed circuit across connector pins and on the printed circuit.
4. When measuring a voltage or closing a circuit across connectors specified in the text,
be sure to use the green wire (GND).
5. When the user is using a word processor or personal computer from the power outlet of
the same line, take necessary steps to prevent the circuit breaker from opening due to
overloads.
6. Keep all disassembled parts in good order and keep tools under control so that none
will be lost or damaged.
7. When any electrical part is to be changed as a result of troubleshooting, always check
for disconnected connectors before replacement of that part.
1-2.

How to Use This Book

1. If a component on a PWB or any other functional unit including a motor is defective, the
text only instructs you to replace the whole PWB or functional unit and does not give
troubleshooting procedure applicable within the defective unit.
2. All troubleshooting procedures contained herein assume that there are no breaks in the
harnesses and cords and all connectors are plugged into the right positions.
3. For the removal procedures of covers and parts and adjustment requirements, see DIS/
REASSEMBLY, ADJUSTMENT.
4. The troubleshooting procedures preclude possible malfunctions due to noise and other
external causes.
1-3.

Reading the Text

1. The paper transport failure troubleshooting procedures are given according to the
symptom. First, identify the location where the paper is present and start the procedure
for that particular location. For malfunction troubleshooting, start with step 1 and
onward.
2. Make checks in numerical order of the steps and, if an item is checked okay, go to the
next step.
3. A remark given in ( ) in the Action column indicates a requirement for adjustment. See
DIS/REASSEMBLY, ADJUSTMENT.
Pattern 1
Step Check Item Result
1 Is ...?
Go to step 2 if you answered
2
NO.
Action
YES Do this.
T-1
Pattern 2
Step Check Item Result
1 Is ...?
2
Action
YES Do this.
NO Check that.
Go to step 2 if it
checked okay.