Safety Precautions - Mitsubishi Electric WD-52631 Service Manual

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Owner's manual (108 pages)

Table Of Contents

Table of Contents

NOTICE:

Observe all cautions and safety related notes located inside the receiver cabinet and on the

receiver chassis.

WARNING:

Operation of this receiver outside the cabinet or with the cover removed presents a shock hazard

from the receiver's power supplies. Work on the receiver should not be attempted by anyone who is

not thoroughly familiar with the precautions necessary when working on high voltage equipment.

When service is required, observe the original lead dress. Where a short-circuit has occurred, replace

those components that indicate evidence of overheating.

SAFETY PRECAUTION

To protect your eyes, do not look directly into the lamp, or light coming directly from the lamp, lens or

mirror.

Leakage current check

Before returning the receiver to the customer, it is recommended that leakage current be measured according to the

following methods.

1. Cold Check

With the alternating current (AC) plug removed from the AC source, place a jumper across the two AC plug

prongs. Connect one lead of an ohm meter to the AC plug and touch the other lead to each exposed metal part

(i.e. antennas, handle bracket, metal cabinet, screw heads, metal overlay, control shafts, etc.), particularly any

exposed metal part that has a return path to the chassis. The resistance of the exposed metal parts having a

return path to the chassis should be a minimum of 1 Meg Ohm. Any resistance below this value indicates an

abnormal condition and requires corrective action.

2. Hot Check ...Use the circuit shown below to perform the hot check test.

1. Keep switch S1 open and connect the receiver to the measuring circuit. Immediately after

connection, and with the switching devices of the receiver in their operating positions, measure the

leakage current for both positions of switch S2.

2. Close switch S1, energizing the receiver. Immediately after closing switch S1, and with the

switching devices of the receiver in their operating positions, measure the leakage current for both

positions of switch S2. Repeat the current measurements of items 1 and 2 after the receiver has

reached thermal stabilization. The leakage current must not exceed 0.5 milliampere (mA).

MODEL: WD-52631 / WD-57731 / WD-65731