Hitachi 46EX1B Bedienungsanleitung

CONTENTS

This service manual gives differences between the 46EXlB and 55EXlK. For any other infor-

mation, see the 55EXlK Service Manual YK No. 0405E issued in July, 1991.

SAFETY PRECAUTIONS. ...................................................... 2

TECHNICAL CAUTIONS ....................................................... 5

SPECIFICATIONS ............................................................. 6

CIRCUIT PROTECl-ION ........................................................ 6

GENERAL INFORMATION. ..................................................... 7

CONVERGENCE ADJUSTMENT ................................................ 9

CAUTIONS WHEN CONNECTING/DISCONNEClNG THE HV CONNECX)R ............ 11

EXPLODEDVIEW.. ........................................................ ..12

WlRlNGDlAGRAM............................................................l 5

REPLACEMENT PARTS LIST .................................................. .16

CAUTION:

Before servicing this chassis, it is important that the service technician read the

“Safety Precaution” and “Product Safety Notices” in this Service Manual.

This service manual is intended for qualified service technicians; it is not meant for the casual

do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have

been trained to properly and safely repair complex products such as those covered by this manual.

Improperly performed repairs can adversely affect the safety and reliability of the product and

may void the warranty. If you are not qualified to perform the repair of this product properly and

safely, you should not risk trying to do so and refer the repair to a qualified service technician.

WARNING

Lead in solder used in this product is listed by the California Health and Welfare agency as

a known reproductive toxicant which may cause birth defects or other reproductive harm

(California Health & Safety Code, Section 25249.5).

When servicing or handling circuit boards and other components which contain lead in solder,

avoid unprotected skin contact with the solder. Also, when soldering do not inhale any smoke

or fumes produced.

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

PROJECTION COLOR TELEVISION

November 1991 HHEA - MANUFACTURING DWISION

46EXlB 1

SAFETY PRECAUTIONS

1. Before returning an instrument to the customer, always

make a safety check of the entire instrument, including,

but not limited to the following items:

a. Be sure that no built-in protective devices are defec-

tive and/or have been deleted during servicing. (1)

Protective shields are provided on this chassis to pro-

tect both the technician and the customer. Correctly

replace all missing protective shields, including any

removed for servicing convenience. (2) When rein-

stalling the chassis and/or other assembly in the

cabinet, be sure to put back in place all protective

devices, including, but not limited to, nonmetallic con-

trol knobs, insulating fishpapers, adjustment and

compartment covers/shields, and isolation resistor/

capacitor networks. Do not operate this instrument

or permit it to be operated without all protective

devices correctly installed and functioning. Ser-

vicers who defeat safety features or fail to perform

safety checks may be liable for any resulting

damage.

b. Be sure that there are no cabinet openings through

which an adult or child niight be able to insert their

fingers and contact a hazardous voltage. Such open-

ings include, but are not limited to, (1) spacing be-

tween the picture tube and cabinet mask, (2) exces-

sively wide cabinet ventilation slots, and (3) an

improperly fitted and/or incorrectly secured cabinet

back cover.

c. Antenna Cold Check - With the instrument AC plug

removed from any AC source, connect an electrical

jumper across the two AC plug prongs. Place the in-

strument AC switch in the on position. Connect one

lead of an ohmmeter to the AC plug prongs tied

together and touch the other ommeter lead in turn

to each tuner antenna input exposed terminal screw

and, if applicable, to the coaxial connector. If the

measured resistance is less than 1.0 megohms or

greater than 5.2 megohms, an abnormality exists that

must be corrected before the instrument is returned

to the customer. Repeat this test with the instrument

AC switch in the off position.

d. Leakage Current Hot Check - With the instrument

completely reassembled, plug the AC line cord

directly into a 120V AC outlet. (Do not use an isola-

tion transformer during this test.) Use a leakage cur-

rent tester or a metering system that complies with

American National Standards Institute (ANSI) C101.0

Leakage Current for Appliances and Underwriters

Laboratories (UL) 1410,(50.7). With the instrument AC

switch first in the on position and then in the off posi-

tion, measure from a known earth ground (metal

waterpipe, conduit, etc.) to all exposed metal parts

of the instrument (antennas, handle bracket, metal

cabinet, screwheads, metallic overlays, control shafts,

etc.), especially any exposed metal parts that offer

an electrical return path to the chassis. Any current

measured must not exceed 0.5 milliamps. Reverse

the instrument power cord plug in the outlet and

repeat test. -2-

LEAKAGE

CURRENT

DEVICE TESTER

UNDER L I

~r;;;:::~~;;~~ND

(Using AC adapter

plug as required)

AC Leakage Test

ANY MEASUREMENTS NOT WITHIN THE LIMITS

SPECIFIED HEREIN INDICATE A POTENTIAL

SHOCK HAZARD THAT MUST BE ELIMINATED

BEFORE RETURNING THE INSTRUMENT TO THE

CUSTOMER OR BEFORE CONNECTING THE

ANTENNA OR ACCESSORIES.

High Voltage -This receiver is provided with a hold

down circuit for clearly indicating that voltage has in-

creased in excess of a predetermined value. Comp-

ly with all notes described in this Service Manual

regarding this hold down circuit when servicing, so

that this hold down circuit may correctly be operated.

Serviceman Warning - With minimum contrast and

brightness, operating high voltage in this receiver is

lower than 31.6kV. In case any component having

influenced on high voltage is replaced, confirm that

high voltage with minimum contrast and brightness

is lower than 31.6kV.

To measure H.V. use a high impedance H.V. meter.

Connect (-) to chassis earth and (+) to the CRT

anode button. (See the following connection

diagram.)

Note: Turn power switch off without fail before the

connection to the anode button is made.

Deflection PW.B.

High Impedance I

H.V. meter

46EXl B

g. X-radiation - TUBE: The primary source of X-

radiation In thus receiver ISthe picture tube. The tube

utilized for the above mentioned function In this

chassis

spectally constructed to limit X-radiation

emissrons.

For continued X-radiation protection, the replacement

tube must be the same type as the original, HITACHI

approved type.

When troubleshooting and making test measure-

ments In a receiver with a problem of excessrve high

voltage, avoid being unnecessarily close to the p~c-

ture tube and the high voltage component.

Do not operate the chassis longer than

necessary

to locate the cause of excessrve voltage.

h. X-radiation Shield -

1) This receiver ISprovided X-ray shield plates for the

protection of X-radiation. Do not remove X-ray

shreld plates A, B, C, D, E, F and shield covers A,

B shown in Fig. 1 unnecessarily when trouble-

shooting and/or making test measurements.

2) Toprevent X-radiation, after replacement of picture

tube and lens, confirm these components to be

fixed correctly to bracket and cabmet, and not to

be taken off easily.

R-Lens

G-Lens

B-Lens

Shield plate A

(Install on CRT

mounting bracket) Shield

Cover A

Glass lens

Shield plate D

(Install on CRT

mounting bracket

mounting bracket)

Shield plate B

(Install on CRT

mounting bracket)

Shield cover B

mounting bracket)

Detailing X-radiation shields

Fig. 1

-3-

46EXlB )

2. Read and comply with all caution and safety-related

notes on or inside the receiver cabinet, on the receiver

chassis, or on the picture tube.

3. Design Alteration Warning - Do not alter or add to the

mechanical or electrical design of this TV receiver.

Design alterations and additions, including, but not

limited to, circuit modifications and the addition of items

such as auxiliary audio and/or video output connections,

might alter the safety characteristics of this receiver and

create a hazard to the user. Any design alterations or

additions may void the manufacturer’s warranty and may

make you, the servicer, responsible for personal injury

or property damage resulting therefrom.

4. Picture Tube Implosion Protection Warning - The

picture tube in this receiver employs integral implosion

protection. For continued implosion protection, replace

the picture tube only with one of the same type number.

Do not remove, install, or otherwise handle the picture

tube in any manner without first putting on shatterproof

goggles equipped with side shields. People not so

equipped must be kept safely away while picture tubes

are handled. Keep the picture tube away from your body.

Do not handle the picture tube by its neck.

5. Hot Chassis Warning - a. Some TV receiver chassis

are electrically connected directly to one conductor of

the AC power cord and may be safely serviced without

an isolation transformer only if the AC power plug is

inserted so that the chassis is connected to the ground

side of the AC power source. To confirm that the AC

power plug is inserted correctly, with an AC voltmeter

measure between the chassis and a known earth

ground. If avoltage reading in excess of l.OV isobtained,

remove and reinsert the AC power plug in the opposite

polarity and again measure the voltage potential between

the chassis and a known earth ground. b. Some TV

receiver chassis normally have 85V AC (RMS) between

chassis and earth ground regardless of the AC plug

polarity. These chassis can be safely serviced only with

an isolation transformer inserted in the power line

between the receiver and the AC power source, for both

personnel and test equipment protection. c. Some TV

receiver chassis have a secondary ground system in

addition to the main chassis ground. This secondary

ground system is not isolated from the AC power line.

The two ground systems are electrically separated by

insulating material that must not be defeated or altered.

6. Observe original lead dress. Take extra care to assure

correct lead dress in the following areas: a. near sharp

edges, b. near thermally hot parts - be sure that leads

and components do not touch thermally hot parts, c. the

AC supply, d. high voltage, and e. antenna wiring. Always

inspect in all areas for pinched, out-of-plate, or frayed

wiring. Do not change spacing between components,

and between components and the printed circuit board.

Check AC power cord for damage.

7. Components, parts, and/or wiring that appear to have

overheated or are otherwise damaged should be re-

placed with components, parts, or wiring that meet

original specifications. Additionally, determine the cause

of overheating and/or damage and, if necessary, take

corrective action to remove any potential safety hazard.

8. PRODUCT SAFETY NOTICE - Many TV electrical and

mechanical parts have special safety-related charac-

teristics some of which are often not evident from visual

inspection, nor can the protection they give necessarily

be obtained by replacing them with components rated

for higher voltage, wattage, etc. Parts that have special

safety characteristics are identified Hitachi service data

by shading on schematics and by a (8) in the parts

list. Use of a substitute replacement that does not have

the same safety characteristics as the recommended

replacement part in Hitachi service data parts list might

create shock, fire, and/or other hazards. Product safety

is under review continuously and new instructions are

issued whenever appropriate. For the latest information,

always consult the appropriate current Hitachi service

literature. A subscription to, or additional copies of

Service literature may be obtained at a normal charge

from Hitachi.

-4-

1 46EXlB

TECHNICAL CAUTIONS

High voltage limiter circuit operation check

1. Connect the high voltage voltmeter between the high

voltage connector and chassis ground as shown in

Fig. 2.

2. Set the AC input voltage to 12OV

3. Set the contrast and brightness control fully to + side

(max.) of the on-screen indication.

4. Connect the jig as shown in Fig. 2 to POWER SUPPLY

PW.B. .

5. Turn the ZOkQ-BVR of the jig fully clockwise viewed from

the knob side.

6. Turn on the set.

7. Gradually turn the 20 k&B VR of the jig counterclockwise

and check that the picture disappears when the high

voltage is less than 38kV

8. Turn off the set immediately after checking that the pic-

ture disappears.

9. Remove the jig and voltmeter.

High Impedance

H.V. meter

POWER SUPPLY f?W.B. (Front View)

Deflection PW.B.

20kQ-B

JIG

Fig. 2

-5-

46EXlB

SPECIFICATIONS

Model:

Cathode-Ray Tube:

Power Input:

Power Consumption:

Antenna Impedance:

Receiving Channel:

Intermediate Frequency:

Video input:

Video Output:

Audio Input:

Stereo Audio Output:

Audio Output Power:

46EXl B

80° deflection 7 inch

(170WB22RM70WB22Gl

17OWB22B)

120

volts AC, 60Hz

225 watts - Maximum

155 watts - Operating

75 ohm Unbalanced

VHF/UHF/CATV CH

VHF

2-13

UHF 14-69

EXT. Mid (A-2)-(A-l), 4*

CATV Mid A-l

CATV Super J-W

CATV Hyper (W+l)-(W+28)

CATV Ultra (W+29)-(W+53)

Picture I-F carrier 45.75 MHz

Sound I-F Carrier 41.25 MHz

Color Sub Carrier 42.17 MHz

1 Voltp-p

ohm

1 Voltp-p

ohm

0.4

volt rms, 40 k ohm

0.4

volt rms,

k ohm

Front - 7 watts rms per

channel, 8 ohm impedance.

Rear - 3 watts rms per

channel, 8 ohm impedance.

Anode Voltage:

30.0

(Zero Beam Current)

Brightness: 390 ft-L Nominal

(Peak White)

Speakers: 2 Woofers - 6 inch

(16 cm) round

Dimension: Width . . . . . . . . . . . . .397/8”

Height. . . . . . . . . . . .487/16”

Depth . . . . . . . . . . . .227/16”

Weight . . . . . . . . . .184 Ibs.

Circuit Board Assemblies: CPT (B) P.C.B.

CPT (G) l?C.B.

Convergence

Correction f?C.B.

Signal PC.B.

Power Supply l?C.B.

Deflection PC.B.

SP Terminal l?C.B.

Control PC.B.

2-LINE COMB l?C.B.

CIRCUIT PROTECTION

Fuse (or Device) Circuit Protected

F901 5.OA-125V (AC) Main Fuse

F903 4.OA-125V (DC) Main Fuse

F904 4.OA-125V (DC) Audio Output Circuit

F905 1.6A-125V (DC) Deflection Circuit

Physical Location

Signal Circuit Board

Power Supply Circuit Board

-6-

j 46EXlB

GENERAL INFORMATION

POWER button I “- syNc knob

POWER

0 V SYNC

Fig. 3 Control Panel

-7-

46EXl B

INPUT 1 jacks

INPUT 2 jacks

AUDIO TO HI-FI jacks

REAR SPEAKER

80 ONLY

SP MATRIX

SURROUND

VHF/UHF EXT.

Rear speaker termmal

Fig. 4 Monitor Connection Panel

-8-

46EXl B

CONVERGENCE ADJUSTMENT

Static Convergence

1. PROGRAM LIST

2. STATION MEMORY

3. CHILD LOCK

4. CONVERGENCE

5. AUTO DEMO

PUSH NO. TO SELECT

PUSH MENU TO END

PUSH NO. --3 ADJUST

<PUSH MEI’+/ TO END ,

PUSH NO. -0 ADJUST

<PUSH MEN J TO END /j

p-k-,

Use button on Remote to align colors

to form white lines

Remote Control

RED

BLUE

Vertical Position

RED

to 81

BLUE

Horizontal Position

7 9

LBLUE J

VOLUME

MUTE

-9-

46EXl B

Dynamic Convergence

_.-.-.-.-.- - -.- -.-.- - - -.-.

RED/BLUE DYNAMIC CONVERGENCE .-.-.- -.-.-.-

I I

1 r-LIN, E r-1 f;yj 6 E fhU-F+ 6 5

i (H-R-Lli ,RHfW, ,RHfW, , i”“’ j,, li”i ,f-KEk, F-KEY, ,fPl)] [e”‘-PIN,

( f-L-LIN, ,BH-TW, rB, Ib”“‘i ,jH-LlN;,, li”Ei f-KEY, f-PljI [-PIN,

i----------------------------------------.--------------------------------------

GV-PIN-PHASE GV-KEY GV-U-KEY GV-PIN GV-U .PIN

GH-PIN-PHASE GH-KEY GH-U-KEY GH-PIN GH-U -PIN

i III

L.-.-.-.-.- -.-.-.- _._._ GREEN GEOMETRIC CORRECTION _ _ _._._._._._ _._._._.

- -.-,-.-.- -.

-I

RH-L -SIZE

Et+-L -SIZE

.-.-.- -.-.-.

Layout of the Adjustment VR

CONVERGENCE CORRECTION

P.C B

RH-L -SIZE

R2139

BH-L -SIZE

R2140

-lO-

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