Precaution Segment; Safety Precautions - Samsung SRP-275 Service Manual

1. Precaution Segment

Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential
hazards such as electrical shock.

1-1 Safety Precautions

1. Be sure that all built-in protective devices are in place. Restore any missing protective shields.
2. When re-installing chassis and assemblies, be sure to restore all protective devices, including control
knobs and compartment covers.
3. Make sure that there are no cabinet openings through which people- particularly children might insert
fingers or objects and contact dangerous voltages. Such openings include excessively wide cabinet
ventilation slots and improperly fitted covers and drawers.
4. Leakage Current Hot Check :
WARNING : Do not use an isolation transformer during this test.
Use a leakage-current tester or metering system that complies with American National Standards Institute
(ANSI C101.1, Leakage Current for Appliances), and Underwriters Laboratories (UL Publication UL1410,
59.7).
With the unit completely reassembled. plug the AC line cord directly into 110V AC or 240V outlet of the
Adapter. With the unit's AC switch first in the ON position and then OFF. Measure the current between a
known earth ground (metal water pipe, conduit, etc.) and all exposed metal parts,
including : metal cabinet, frame, screwheads and printer. The current measured should not exceed 0.1
milliamp. Reverse the power-plug prongs in the AC outlet and repeat the test.
5. Design Alteration Warning :
Never alter or add to the mechanical or electrical design of the Receipt Printer. Unauthorized alterations
might create a safety hazard. Also, any design changes or additions will void the manufacturer's warranty.
6. Components, parts and wiring that appear to have overheated or that are otherwise damaged should be
replaced with parts that meet the original specifications. Always determine the cause of damage or
overheating, and correct any potential hazards.
7. Observe the original lead dress, especially near the following areas : sharp edges, and especially the AC
and high voltage supplies. Always inspect for pinched, out-of-place, or frayed wiring. Do not change the
spacing between components and the printed circuit board. Check the AC power cord for damage. Make
sure that leads and components do not touch thermally hot parts.
8. Product Safety Notice :
Some electrical and mechanical parts have special safety-related characteristics which might not be
obvious from visual inspection. These safety features and the protection they provide could be lost if a
replacement component differs from the original. This holds true, even though the replacement may be
rated for higher voltage, wattage, etc.
Components that are critical for safety are indicated in the circuit diagram by shading, ( or ). Use only
replacement components that have the same ratings, especially for flame resistance and dielectric
specifications. A replacement part that does not have the same safety characteristics as the original might
create shock, fire or other safety hazards.
Rev. 2.00
- 6 -
SRP-275