Mitsubishi -- V26.pdf

D own to 1

2004

™

HIGH SPEED TROUBLESHOOTING

V26 CHASSIS

V26 V26+ V26++

WD-52525 WD-52725 WD-52825

WD-62525 WD-62725 WD-62825

Second Edition

Includes PWB Level Troubleshooting

MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.

9351 Jeronimo Road, Irvine, CA 92618-1904

V26 CHASSIS

Down to 1 - High Speed Troubleshooting

TABLE of CONTENTS

Safety Precautions ......................................................................................................................... 4

Cabinet Disassembly ...................................................................................................................... 5

Chassis Removal ............................................................................................................................ 8

Lamp Ballast Removal .................................................................................................................... 9

Optical Engine Removal ................................................................................................................ 10

Data Copy Procedure .................................................................................................................... 12

HDD Replacement ........................................................................................................................ 13

Troubleshooting ............................................................................................................................ 14

Front Panel LED Designations ...................................................................................................... 15

Error Codes .................................................................................................................................. 15

Lamp Troubleshooting ................................................................................................................... 16

Power PWB Troubleshooting ........................................................................................................ 16

PWB Level Troubleshooting .......................................................................................................... 18

Parts Quick Reference .................................................................................................................. 19

MODELS: WD-52525 / WD-52725 / WD-52825 / WD-62525 / WD-62725 / WD-62825

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in television receivers have special safety related characteristics. These charac-

teristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by

using replacement components rated for higher voltage, wattage, etc.

Replacement parts which have special safety characteristics are identified in this manual.

Electrical components having such features are identified by bold type in the parts list of this manual. Therefore, the

replacement for any safety part should be identical in value and characteristics.

SAFETY PRECAUTIONS

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. Extra precaution should be taken to

assure correct lead dress in the high voltage area. Where a short-circuit has occurred, replace those

components that indicate evidence of overheating.

WARNING ... RISK OF EYE INJURY

Do not look into the light source, lens or mirror when operating the TV

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).

Page 4

MODELS: WD-52525 / WD-52725 / WD-52825 / WD-62525 / WD-62725 / WD-62825

Reusable Wire Ties

Lift Tab to Release

Do not cut wire ties during disassembly . Reusable wire

ties are used in these models. Lift the tab to release the

wire tie. During reassembly, re-use wire ties to ensure all

wiring harnesses are properly bundled and dressed.

Wire Tie

CABINET DISASSEMBLY (FRONT VIEW)

WD-52525 / WD-62525 / WD-52725 / WD-62725

*Refer to the Parts List for Part Numbers

Front Cabinet Disassembly

1. Remove the SPEAKER-GRILLE by pulling forward.

2. Remove screws (a) to remove the COVER-FRONT.

3. Remove screws (b) on the rear of the upper back cover (4 across the top and 3 on each side)..

4. Remove the 4 screws (c) holding the bottom of the Screen Assembly.

5. Unplug connector LN from the Control Panel.

6. Lift the Screen Assembly up slightly then pull towards the front to remove the assembly

Page 5

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: