Troubleshooting; Introduction; Precautions; Checking Prior To Troubleshooting - Brother FAX1170 Service Manual

2. TROUBLESHOOTING

2.1

Introduction

This section gives the service personnel some of the troubleshooting procedures to be fol-
lowed if an error or malfunction occurs with the facsimile equipment. It is impossible to an-
ticipate all of the possible problems which may occur in future and determine the trouble-
shooting procedures, so this section covers some sample problems. However, those
samples will help service personnel pinpoint and repair other defective elements if he/she
analyzes and examines them well.
2.2

Precautions

Be sure to observe the following to prevent the secondary troubles from happening:
(1) Always unplug the AC cord from the outlet when removing the covers and PCBs, ad-
justing the mechanisms, or conducting continuity testing with a circuit tester.
(2) When disconnecting the connectors, do not pull the lead wires but hold the connector
housings.
(3) Before handling the PCBs, touch a metal portion of the machine to discharge static
electricity charged in your body.
When repairing the PCBs, handle them with extra care.
After repairing the defective section, be sure to check again if the repaired section works cor-
rectly. Also record the troubleshooting procedure so that it would be of use for future trouble
occurrence.
2.3

Checking prior to Troubleshooting

Prior to proceeding to the troubleshooting procedures, check that:
(1) Each voltage level on AC input lines and DC lines is correct.
(2) All cables and harnesses are firmly connected.
(3) None of the fuses are blown.
VI – 12