Cleaning-Fuse Replacement Maintenance

Cleaning

Clean the printhead and paper—out sensor periodically to remove paper dust and debris. At a minimum, clean after every 100 rolls of use. Perform these steps for cleaning: 

1. Pull up the latch (14) and remove the paper roll.

2. Gently wipe the surface of the printhead and paper sensor with a cotton swab soaked in isopropyl alcohol. When cleaning the printhead, touch the printhead only with the cotton swab, not with your fingers.

Protecting Printouts

Protect thermal paper printouts by following these guidelines:

1. Do not apply tape or other adhesives over annotations or tracings on the front side of the paper. Apply adhesives only to the back of the paper.

2. Store printouts only in paper folders. Do not store printouts in plastic folders.

3. Avoid extended exposure to sunlight, temperatures above 27° C (81⁰ 1⁼), or humidity above 70 percent.

Fuse Replacement

The fuses are located in the rear panel of the instrument.

1. Place a thin, flat—blade screwdriver in the recessed area under the retaining tab of the fuseholder. Twist the screwdriver to release the retaining tab.

2. Pull the fuseholder out. Replace fuses with the same type, voltage rating, and current rating. Refer to the parts list (page 5—7).

Special Handling Procedures For Static Sensitive Devices (SSDs)

Many electronic semiconductor devices such as MOS ICs, FETs, optical isolators, or film resistors can he damaged by the discharge of static electricity. It is very common for anyone to build up static charges, especially when wearing synthetic clothes, and to transfer this charge to any object touched. Such a discharge can damage or destroy Static Sensitive Devices (SSDs). In most cases, the discharge is not even perceptible to the person at fault.

In order to help prevent damage to SSDs due to static discharge, observe the following precautions when performing any open-case test, maintenance, or repair procedures:

Look for SSD Symbol:

Note that SSDs such as PCBs are indicated in this service manual with the following warning:

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