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INT-W200 / INT-WJ200

SAFETY CHECK-OUT

(U.S. Model only)

        After correcting the original service problem, perform the following safety checks before releasing the unit to the customer:

1. Check the area of your repair for unsoldered or

poorly-soldered connections. Check the entire board
surface for solder splashes and bridges.

2. Check the interboard wiring to ensure that no wires

are “pinched” or contact high-wattage resistors.

3. Check that all control knobs, shields, covers,

ground straps, and mounting hardware have been
replaced. Be absolutely certain that you have
replaced all the insulators.

4. Look for unauthorized replacement parts,

particularly transistors, that were installed during
a previous repair.  Point them out to the customer
and recommend their replacement.

5. Look for parts which, though functioning, show  obvious

signs of deterioration.  Point them out to the customer
and recommend their replacement.

6. Check the line cords for cracks and abrasion. Recommend

 the replacement of any such line cord to the customer.

7. Check the B+ and HV to see if they are specified values.

Make sure your instruments are accurate; be suspicious
 of your HV meter if sets always have low HV.

8. Check the antenna terminals, metal trim, “metallized"

knobs, screws, and all other exposed metal parts for AC
Leakage.  Check leakage as described below.

LEAKAGE 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, mU.S.t not exceed 0.5 mA (500 microampere).
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 instructions.

2. A battery-operated AC milliameter. 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 0.75 V, so analog meters mU.S.t have an accu-
rate low voltage scale.  The Simpson's 250 and Sanwa SH-
63Trd are examples of passive VOMs that are suitable.
Nearly all battery operated digital multimeters that have
a 2V AC range are suitable.   (See Fig. A)

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

1.5 k

W

0.15 µF

AC
Voltmeter
(0.75 V)

To Exposed Metal
Parts on Set

Earth Ground

Содержание INT-W200

Страница 1: ... port 96 pin 1 IR Blaster Out 1 U S Supplied Accessories Remote Control CH3 CH4 Switch 1 U S RM Y801 1 U S VHF UHF In Out 1 U S RM J313 1 JAPAN AC In 1 Size AA Batteries 2 Mic Input JAPAN AC Power Cord 1 1 9m A V Audio Video Cable 1 1 5m Telephone Cable 1 7 5m Dimensions 355 mm x 73 5 mm x 226mm w h d T Splitter 1 w h d 14 x 2 7 8 x 8 57 64 IR Blaster 1 U S S Video Cable 1 5m 1 Weight 3 kg 6 lbs 1...

Страница 2: ...e specified values Make sure your instruments are accurate be suspicious of your HV meter if sets always have low HV 8 Check the antenna terminals metal trim metallized knobs screws and all other exposed metal parts for AC Leakage Check leakage as described below LEAKAGE TEST The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part havin...

Страница 3: ...per Case and Front Cover Removal 8 2 2 Power Supply Board Hard Disk and Main PC Board Removal 8 3 SYSTEM DIAGNOSTIC TEST 9 4 DIAGRAMS 4 1 Block Diagrams 10 4 2 Power Supply Schematic 11 4 3 Power Supply Part List 12 4 4 Main PC Board Schematic 13 5 EXPLODED VIEW 47 6 ELECTRICAL PARTS LIST 48 ...

Страница 4: ...WS BVTT S 3x6 2 2 POWER SUPPLY BOARD HARD DISK AND MAIN PC BOARD REMOVAL 2 1 UPPER CASE AND FRONT COVER REMOVAL SECTION 2 DISASSEMBLY COVER CONNECTOR FOUR 4 SIDE OF COVER SCREWS S TIGHT PTTWH 3X6 ONE 1 REAR PANEL SCREW S TIGHT PTTWH 3X6 FOUR 4 FRONT PANEL LATCHES THREE 3 BACK PANEL LATCHES FOUR 4 BACK OF COVER SCREWS BVTT 3X6 ONE 1 REAR PANEL SCREW 3X12 ...

Страница 5: ... 4 Under Port Settings set as follows Bits per second 19200 Data bits 8 Parity None Stop bits 1 Flow Control None 3 4 TEST PROCEDURE 1 Connect the WebTV unit to PC terminal as shown in Figure 1 below 2 Energize the WebTV unit 3 The computer monitor will show the list of diagnostics choices 4 In order to select a test type the number associated with the test on the keyboard and press enter The outp...

Страница 6: ...2 8 2K 0 25W C653 820 16V F652 125V 2 5A R653 220 0 25W C654 22 50V IC601 PS2501 1 R654 1 0K 0 25W C655 0 18 50V IC651 M51957BL R655 10K 0 25W C656 0 01 50V L601 50mH 0 5A R656 3 4K 0 25W C657 0 015 50V L651 3 3µH 2 5A R657 5 23K 0 25W C658 220 25V L652 3 3µH 2 5A R658 82 0 25W C659 3300 16V L653 3 3µH 2 5A R659 150 0 5W C660 330 25V L654 Ferrite Bead R660 270 2W C662 1 50V Q601 2SK2662 R661 180 0...

Страница 7: ...EF NO PART NO DESCRIPTION REMARK 1 X 4034 962 1 PANEL ASSY FRONT U S 2 5 1 X 4034 962 2 PANEL ASSY FRONT JAPAN 2 5 2 4 908 848 01 EMBLEM SONY 3 4 060 987 01 PANEL INDICATOR U S 3 4 060 987 11 PANEL INDICATOR JAPAN 4 4 060 984 01 GUIDE LED 5 4 060 985 01 GUIDE REMOTE 6 4 060 980 21 CASE LOWER 7 X 4034 930 1 COVER ASSY 7 8 8 4 060 982 01 COVER CONNECTOR 9 4 060 983 01 LID S webtv 2 3 6 8 9 14 12 11 ...

Страница 8: ...2 U0203 9 880 306 01 IC ZR431 U0204 9 880 307 01 IC ZR431 U0301 9 880 309 01 IC 79RV4640 167DU MAIN PC BOARD 1 761 026 11 PC BOARD ASSY MOUNTED U S 1 761 027 11 PC BOARD ASSY MOUNTED JAPAN DIODE D0601 9 880 301 01 DIODE DF04S D0801 9 880 291 01 DIODE BAV99LT1 D0802 9 880 291 01 DIODE BAV99LT1 D0804 9 880 291 01 DIODE BAV99LT1 D0806 9 880 291 01 DIODE BAV99LT1 JAPAN D1004 9 880 293 01 DIODE LGT670 ...

Страница 9: ...6A 14H U1401 9 880 271 01 IC TMLHS 021 A U S U1402 9 880 305 01 IC MC3403D U S U1403 9 880 317 01 IC BT827A U1404 9 880 322 01 IC 74F3384Q U1405 9 880 321 01 IC TDA9851 U S U1406 9 880 318 01 IC LT1172CS8 U S U1407 9 880 308 01 IC KA78M05RTM U1501 9 880 322 01 IC 74F3384Q U1502 9 880 322 01 IC 74F3384Q VARISTOR V0601 9 880 328 01 VARISTOR P3100EA70 CRYSTAL Y0601 9 880 326 01 CRYSTAL 56 448MHz Y110...

Страница 10: ... 50 INT W200 INT WJ200 NOTES ...

Страница 11: ... 51 INT W200 INT WJ200 NOTES ...

Страница 12: ... 52 INT W200 INT WJ200 Sony Corporation Sony Technology Center San Diego Product Quality Division Service Promotion Department 9 978 839 01 English 97LJ740005 1 Printed in U S A 1997 12 ...

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