MODEL IDENTIFICATIONSAFETY CHECK-OUT
N BACK PANEL N(US model only)
After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
4-978-
Check the antenna terminals, metal trim, Ometallized� knobs,
screws, and all other exposed metal parts for AC leakage. Check
CDP-C250Zleakage as described below.
US Model: 490-71
CDP-C350Z
LEAKAGE
US Model: 490-81
CDP-CE305
US Model: 490-01The AC leakage from any exposed metal part to earth ground
Canadian Model: 490-11and from all exposed metal parts to any exposed metal part
AEP Model: 767-21
having a return to chassis, must not exceed 0.5 mA (500
German Model: 490-31
Australian Model: 490-41microampers). Leakage current can be measured by any one of
three methods.
E Model: 490-51
Chinese Model: 490-61
CDP-CE4051. A commercial leakage tester, such as the Simpson 229 or
US Model: 767-01RCA WT-540A. Follow the manufacturersO instructions to
Canadian Model: 767-11
use these instruments.
AEP, East Europian,
Chinese Model: 767-21
UK Model: 767-412. A battery-operated AC milliammeter. The Data Precision 245
German Model: 767-31digital multimeter is suitable for this job.
E Model: 767-61
Australian Model: 767-51
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The Olimit�
indication is 0.75 V, so analog meters must have an accurate
NOTES ON HANDLING THE OPTICAL PICK-UPlow-voltage scale. The Simpson 250 and Sanwa SH-63Trd
BLOCK OR BASE UNITare examples of a passive VOM that is suitable. Nearly all
battery operated digital multimeters that have a 2V AC range
The laser diode in the optical pick-up block may sufferare suitable. (See Fig. A)
electrostatic breakdown because of the potential difference
generated by the charged electrostatic load, etc. on clothing and
the human body.
To Exposed Metal
Parts on SetDuring repair, pay attention to electrostatic breakdown and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
AC
0.15?F1.5kvoltmeter
(0.75V)NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
Earth Groundpick-up block. Therefore, when checking the laser diode
emission, observe from more than 30 cm away from the objective
Fig. A. Using an AC voltmeter to check AC leakage.
lens.
N 3 N |
ACEC
SONY
