Troubleshooting Procedure; Troubleshooting Guide - Citizen CT-S651 Series Service Manual

2-3.

Troubleshooting Procedure

When a fault occurs, confirm its phenomenon, locate the problem in accordance with "2.2 Troubleshooting
Guide", and troubleshoot it as described below.
Find the fault phenomenon in this column. If there are multiple phenomena, take all the applicable
Phenomenon
items into consideration. This will help you locate hidden problems as well.
Possible causes are listed here. Find probable causes from the list and follow the check method to
Cause
identify the cause of the fault.
Check Method The check method for identifying the cause of the fault is described.
Remedies Take the remedies described in this column.
By following the above-mentioned procedure, you can troubleshoot problems efficiently with fewer
misjudgments.
2-4.

Troubleshooting Guide

● Power Supply Failure
Phenomenon
Power cannot be turned
on.
(The POWER LED not
illuminated.)
The fuse is blown soon if
it is replaced with a new
one.
* If the fuse is blown with the specified AC adapter used, the thermal head or control PCB may be defective. Replace
the defective part with a new one. Check wiring of the interface cable.
Cause
The power cable is not
connected.
The fuse is blown.
The control PCB is faulty.
The circuit drive power is
abnormal.
Check Method
−
Check if the specified fuse is
used.
−
Use a tester and measure
the circuit drive voltage.
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CT-S651 Series Service Manual
Remedies
Connect the power cable.
Use the specified fuse.
Replace "SA, MAIN PCB".
Replace "SA, MAIN PCB".