Sony PFV-SP3300 Bakım Kılavuzu - Sayfa 39

Stereo sistemi Sony PFV-SP3300 için çevrimiçi göz atın veya pdf Bakım Kılavuzu indirin. Sony PFV-SP3300 40 sayfaları. Signal processing unit, backup power supply unit
Ayrıca Sony PFV-SP3300 için: Kurulum Kılavuzu (16 sayfalar), Kullanım Kılavuzu (18 sayfalar), Kullanım Kılavuzu (18 sayfalar)

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PFV-SP3300

SAFETY CHECK-OUT

After correcting the original service problem,

perform the following safety checks before

releasing the set to the customer :

Check the metal trim, "metallized" knobs, screws,

and all other exposed metal parts for AC

leakage. Check leakage as described below.

LEAKA GE TEST

The AC leakage from any exposed metal part to

earth ground and from all exposed metal parts to

any exposed metal part having a return to

chassis, must not exceed 3.5 mA. Leakage

current can be measured by any one of three

methods.

1. A commercial leakage tester, such as the

Simpson 229 or RCA WT-540A. Follow the

manufacturers' instructions to use these

instruments.

2. A battery-operated AC milliammeter. The

Data Precision 245 digital multimeter is

suitable for this job.

3. Measuring the voltage drop across a resistor

by means of a VOM or battery-operated AC

voltmeter. The "limit" indication is 5.25 V, so

analog meters must have an accurate low-

voltage scale. The Simpson 250 and Sanwa

SH-63Trd are examples of a passive VOM

that is suitable. Nearly all battery operated

digital multimeters that have a 20 V AC range

are suitable. (See Fig. A)

To Exposed Metal

Parts on Set

0.15 µ F

1.5 k Z

Earth Ground

Fig A. Using an AC voltmeter to check AC leakage.

voltmeter

(5.25V)