Introduction; How To Use This Book; Reading The Text; General Precautions - Minolta Di 620 Manual

1

INTRODUCTION

1139SBT0101A

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 the chains and gears. When servicing the
copier with the Rear Cover removed, be sure to fit the interlock switch actuating jig in position.
2. Before attempting to replace parts and unplug connectors, make sure that the power cord of the
copier has been unplugged from the wall outlet.
3. Never create a closed circuit across connector pins except those specified in the text and on the
printed circuit.
4. When creating a closed circuit and measuring a voltage across connector pins 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 a wall 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.
1139SBT0102A

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
procedures 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, see DIS/REASSEMBLY, ADJUSTMENT.
4. The troubleshooting procedures are given in the order of greater frequency of trouble or order of
operation.
5. The procedures preclude possible malfunctions due to noise and other external causes.
1139SBT0103A

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 steps and, if an item is checked okay, go to the next step.
Pattern 1
Step Check Item Result
1 Is ...?
2
Go to step 2 if you answered NO.
Action
YES Do this.
Pattern 2
Step Check Item Result
1 Is ...?
2
T-1
Action
YES Do this.
NO Check that.
Go to step 2 if it checks okay.