UP-800 (serv.man17). for spare part numbers refer to the seperate parts guide manual. - Sharp ECR Service Manual (repair manual). Page 13

5-2

LT-1320CS

Repair power supply circuit

to provide rated voltage.

Ensure that connector is

correctly seated and gives

proper contact.

Replace thermal print head

unit.

Repair power supply circuit

to provide rated voltage.

Replace thermal print head

unit.

Clean head with soft cloth

moistened in ethanol (cleaning

alcohol).

Replace thermal print head

unit.

Repair power supply circuit

to provide rated voltage.

Clean head with soft cloth

moistened in ethanol (cleaning

alcohol).

Replace printer paper with

paper that meets specifi-

cations.

■ Servicing Procedure

When a problem has occurred, check the symptoms carefully and proceed according to the instructions given in the

section "Symptoms and Countermeasures".
● Symptom................. Look in this column for a condition that matches or closely resembles the current

condition of the printer. This will allow you to determine also hidden faults.

● Cause ...................... Possible causes are described in this column. To determine which cause applies in each

instance, use the check procedure described in the next column.

● Check ...................... Lists steps designed to pinpoint the cause of a problem.
● Countermeasure ...... This column lists the steps to be taken in order to correct the problem.

Following the procedure outlined below will contribute to accurate diagnosis and ensure efficient troubleshooting.

■ Symptoms and Countermeasures

Symptom

Cause

Check

Countermeasure

Head is not powered correctly.

Thermal print head connector

faulty.

T h e r m a l   p r i n t   h e a d   u n i t

defective.

Head is not powered correctly.

Thermal print head unit de-

fective.

Contamination or foreign

object on thermal print head.

T h e r m a l   p r i n t   h e a d   u n i t

defective.

Head is not powered correctly.

Contamination or foreign

object on thermal print head.

Incorrect printer paper is used.

Use tester or oscilloscope to

measure power supply voltage.

Check connector contact con-

dition.

-

Use tester or oscilloscope to

measure power supply voltage.

-

Check thermal print head for

contamination.

-

Use tester or oscilloscope to

measure power supply voltage.

Check thermal print head for

contamination.

Check whether printer paper

meets specifications.

Unit does not print.

Print is faint.

Missing dots.

Print is dirty.

Print quality is bad.

Printing

problem