Bose 10.2 Stereo Everywhere Manual de servicio - Página 4

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1. Parts that have special safety characteristics are identified by the

schematics or by special notes on the parts list. Use only replacement parts that

have critical characteristics recommended by the manufacturer.

2. Make leakage current or resistance measurements to determine that exposed

parts are acceptably insulated from the supply circuit before returning the unit

to the customer. Use the following checks to perform these measurements:

A. Leakage Current Hot Check

(1) With the unit completely reassembled, plug the AC line cord directly

into a 120V AC outlet. Do not use an isolation transformer during

this test. Use a leakage current tester or a metering system that

complies with American National Standards Institute (ANSI) C101.1

"Leakage Current for Appliances" and Underwriters Laboratories (UL) 1492 (71).

(2) With the unit AC switch first in the ON position and then in the OFF position,

measure from a known earth ground (metal water pipe, conduit, etc.) to all

exposed metal parts of the unit (antennas, handle bracket, metal cabinet,

screwheads, metallic overlays, control shafts, etc.), especially any

exposed metal parts that offer an electrical return path to the chassis.

(3) Any current measured must not exceed 0.5 milliamp.

(4) Reverse the unit power cord plug in the outlet and repeat test.

ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN

INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE ELIMINATED

BEFORE RETURNING THE UNIT TO THE CUSTOMER.

B. Insulation Resistance Test Cold Check

(1) Unplug the power supply and connect a jumper wire between the two

prongs of the plug.

(2) Turn on the power switch of the unit.

(3) Measure the resistance with an ohmmeter between the jumpered AC plug

and each exposed metallic cabinet part on the unit. When the exposed

metallic part has a return path to the chassis, the reading should be

between 1 and 5.2 megohms. When there is no return path to the chassis,

the reading must be "infinite". If it is not within the limits specified, there is

the possibility of a shock hazard, and the unit must be repaired and

rechecked before it is returned to the customer.

SAFETY INFORMATION

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