UP-600, UP-700 (serv.man21). UP600-700 Printer Manual - Sharp ECR Service Manual (repair manual). Page 9

1) Place the head-up lever in the 

: Cleaning position. Make sure it

is securely locked.

2) Wipe the heating element of the head and platen rollers clean with

a soft cloth or cotton pledget moistened with alcoholic solvent
(ethanol, methanol or IPA: isopropyl alcohol).

3) After making sure the alcoholic solvent has thoroughly evapo-

rated, undo the head-up lever and platen rollers in the 

 Close

position.

If paper dust is attached to the platen roller surface, the paper
feeding power is reduced. Be sure to clean the platen roller sur-
face when cleaning the head.

The illustration shows the state when the PT-cover is removed for
explanation purposes only.

Fig. Head and Platen roller cleaning

Check the items listed in the table below every 6 months, and correct
any problems.

Table of periodic checks

No.

Check items

Standard

Procedure

1

Dust, fuzz and dirt
sticking to various
parts.

•

The mechanism should not have a lot of dirt, fuzz or dust on its surface.
Foreign substances should not be allowed to collect.

•

Clean the unit with a vacuum cleaner.

•

The paper guide should not be clogged with paper chips, etc.

•

Remove paper chips with a tweezers.

2

Lubrication

•

See "Chapter 6".

•

Refer to "Chapter 6" For lubrication.

3

Operational check

•

Printing is operated without abnormality.

•

See "Chapter 5".

•

Feeding operated without abnormality.

•

Observe respective functions. Abnormal operation caused by parts
wear, deformation, bending, etc., do not exist.

•

See "Chapter 5" and "Chapter 6".

Troubleshooting and repair of the printer is classified into two levels
(A and B), depending on the difficulty of the repair.

Persons undertaking a repair should consider their level of technical
skill and the level of the repair before attempting to ensure that the
trouble is handled correctly.

Level A: This requires general knowledge about the operating princi-

ples and structure of the printer, along with technical skill
and minimum experience.

Level B: This requires full knowledge of the operating principles and

structure of the printer, adequate technical skill, and repair
experience.

If trouble occurs, observe the symptoms, determine the cause by
referring to Section 3 "Repair Guidelines," and repair it. The "Repair
Guidelines" are divided into the following five columns so that any
trouble can be analyzed and a solution found.

•

Problem

Check for symptoms.

•

Condition

Compare the problem with the examples given in this column and
determine if they match.

•

Cause

Causes that can be assumed for the problem are listed.
Determine the cause. Also, refer to the repair level indicated for
each cause.

•

Checkpoints and Checking Method

How to check for the cause of a problem is listed. Check the
defective part as instructed in this column.

•

Repair Method

Repair the defective part as instructed in this column. If the same
problem occurs after the repair, check the other causes in the
"Cause" column again, and repair accordingly.

Cotton swab

Platen roller

Thermal head unit