Before Repair; Protection Circuitry - Technics SE-CH610 Service Manual

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Operating instructions manual (39 pages)

Table of Contents

SE-CH610

m@ Contents

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Operation Check and

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@ Before Repair

(1) Turn off the power supply. Using a 10 2, 10 W resistor, connect both ends of power supply capacitors (C701, C702) in order to discharge the voltage.

(2) Before turning the power supply on, after completion of repair, slowly apply the primary voltage by using a power supply voltage controller to make

sure that the consumed current at 50/60 Hz in NO SIGNAL mode should be shown below with respect to supply voltage 110 V/127 V/220 V/240 V.

AC 220~240 V

70~190 mA

Power supply voltage

AC 110~127 V

140~380 mA

Consumed current 50Hz

@ Protection Circuitry

The protection circuitry may have operated if either of the following conditions is noticed:

* No sound is heard when the power is switched ON.

* Sound stops during a performance.

The functions of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are "shorted", or if

speaker systems with an impedance less than the indicated rated impedance of this unit are used.

If this occurs, follow the procedure outlined below:

1. Switch OFF the power.

2. Determine the cause of the problem and correct it.

3. Switch ON the power once again.

Note:

When the protection circuitry functions, the unit will not operate unless the power is first switched OFF and then ON again.

M@ Accessories

® AC power supply cord

® Flat cable

® Remote control transmitter

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