Text preview for : 46EX1B.pdf part of Hitachi 46EX1B Hitachi Projection Color Television
Models: 46EX1B
Chassis: AP12
Service Manual
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CONTENTS
This service manual gives differences between the 46EXlB and 55EXlK. For any other information, see the 55EXlK Service Manual YK No. 0405E issued in July, 1991.
SAFETY PRECAUTIONS. ...................................................... TECHNICAL CAUTIONS ....................................................... SPECIFICATIONS ............................................................. CIRCUIT PROTECl-ION ........................................................ GENERAL INFORMATION. ..................................................... ................................................ CONVERGENCE ADJUSTMENT CAUTIONS WHEN CONNECTING/DISCONNEClNG THE HV CONNECX)R EXPLODEDVIEW.. ........................................................ WlRlNGDlAGRAM............................................................l REPLACEMENT PARTS LIST .................................................. 2 5 6 6 7 9 11 ..12 5 .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 defective and/or have been deleted during servicing. (1) Protective shields are provided on this chassis to protect both the technician and the customer. Correctly replace all missing protective shields, including any removed for servicing convenience. (2) When reinstalling 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 control 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. Servicers 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 openings include, but are not limited to, (1) spacing between the picture tube and cabinet mask, (2) excessively 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 instrument 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 isolation transformer during this test.) Use a leakage current 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 position, 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-
DEVICE UNDER
LEAKAGE CURRENT TESTER L I
~r;;;:::~~;
(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 increased in excess of a predetermined value. Comply 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.
ct
Deflection High Impedance H.V. meter I
PW.B.
46EXl B g. X-radiation - TUBE: The primary source of Xradiation In thus receiver IS the picture tube. The tube utilized for the above mentioned function In this chassis IS 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 measurements In a receiver with a problem of excessrve high voltage, avoid being unnecessarily close to the p~cture tube and the high voltage component. Do not operate the chassis longer than IS necessary to locate the cause of excessrve voltage. h. X-radiation Shield 1) This receiver IS provided 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 troubleshooting and/or making test measurements. 2) To prevent 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 plate D (Install on CRT mounting bracket
Shield Cover A Glass lens
mounting
bracket)
Shield plate B (Install on CRT mounting bracket) mounting Shield mounting cover B
mounting
bracket)
bracket)
bracket)
Detailing
X-radiation Fig. 1 -3-
shields
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.
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 replaced 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.
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 is obtained, 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.
8. PRODUCT SAFETY NOTICE - Many TV electrical and mechanical parts have special safety-related characteristics 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 picture disappears. 9. Remove the jig and voltmeter.
Deflection
PW.B.
High Impedance H.V. meter
POWER
SUPPLY
f?W.B. (Front
View)
20kQ-B JIG
Fig. 2 -5-
46EXlB
SPECIFICATIONS
Model: Cathode-Ray Tube: 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 75 ohm 1 Voltp-p 75 ohm 0.4 volt rms, 40 k ohm 0.4 volt rms, 1 k ohm Front - 7 watts rms per channel, 8 ohm impedance. Rear - 3 watts rms per channel, 8 ohm impedance. Anode Voltage: Brightness: Speakers: Dimension:
30.0 kV
(Zero Beam Current) 390 ft-L Nominal (Peak White) 2 Woofers - 6 inch (16 cm) round Width . . . . . . . . . . . . .397/8" Height. . . . . . . . . . . .487/16" Depth . . . . . . . . . . . .227/16" Weight . . . . . . . . . .184 Ibs. 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.
Power Input: Power Consumption: Antenna Impedance: Receiving Channel:
Circuit Board Assemblies:
Intermediate
Frequency:
Video Video Audio Stereo Audio
input: Output: Input: Audio Output: Output Power:
CIRCUIT PROTECTION
Fuse (or Device)
F901 F903 F904 F905 5.OA-125V 4.OA-125V 4.OA-125V 1.6A-125V (AC) (DC) (DC) (DC)
Circuit
Protected
Signal Power Power Power
Physical Location
Circuit Supply Supply Supply Board Circuit Board Circuit Board Circuit Board
Main Fuse Main Fuse Audio Output Circuit Deflection Circuit
-6-
j 46EXlB
GENERAL
INFORMATION
POWER
button
I
"- syNc
knob
POWER
0
*O
0
V SYNC
Fig. 3 Control Panel -7-
46EXl B
INPUT INPUT AUDIO
1 jacks 2 jacks
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
Static Convergence I
ADJUSTMENT
1
1. PROGRAM LIST 2. STATION MEMORY 3. CHILD LOCK 4. CONVERGENCE 5. AUTO DEMO PUSH NO. TO SELECT PUSH MENU TO END
1 @ 1
Use button on Remote to align colors to form white lines Remote Control
RED
BLUE
r 0 0
VOLUME
MUTE
: Vertical Position
t0 21
PUSH NO. -- 3 ADJUST
RED
BLUE
Horizontal
Position
PUSH NO. -0 ADJUST
+ 7 60
LBLUE J
9
1 El
p-k-,
MENU
-9-
46EXl B Dynamic Convergence
_.-.-.-.-.I
- -.- -.-.-
- - -.-.
I
RED/BLUE
DYNAMIC
CONVERGENCE J
.-.-.-
-.-.-.-
- -.-,-.-.-
-. i
i i i i i i i i i i i i i i i i 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,
RH-L -SIZE I El
(
f-L-LIN,
,BH-TW,
rB,
Ib""`i
,jH-LlN;,,
li"Ei
f-KEY,
f-PljI
[-PIN,
Et+-L -SIZE I I El -.-.-.
i----------------------------------------.--------------------------------------
-I .-.-.GV-KEY GV-U-KEY GV-PIN GV-U .PIN
:
i
i
GV-PIN-PHASE
i
1 I
i i i
i
i
GH-PIN-PHASE GH-KEY GH-U-KEY GH-PIN GH-U -PIN I
I
i i i L.-.-.-.-.-
III -.-.-._._._ GREEN GEOMETRIC CORRECTION _ _ _._._._._._ _._._._.
i
I I
i
Layout of the Adjustment
VR
CONVERGENCE CORRECTION P.C B
i
n n
R2139 R2140
RH-L -SIZE
BH-L -SIZE
-lO-
1 46EXlB
CAUTIONS
WHEN CONNECTING/DISCONNECTING
THE HV CONNECTOR
Perform the following when the HV connector (anode connector) is removed or inserted for CPT replacement, etc.
-
HV cap
Anode connector Anode FBT Deflection F!W.B. connector
Fig. 5 During Removal 1. Insert a small flat-bladed screwdriver (adjustment screwdriver : 5-7 mm wide and 0.2-0.3 mm thick) into section @ in Fig. 6 then push it in the direction of arrow B . The lock will release with a click. (The state in Fig. 841) will change to that in Fig. 8-(2).)
Fig. 7 During Insertion 1. Insert the anode connector deep into the FBT (to section @ in Fig. 7) and then push the HV cap into the FBT until it clicks. 2. Make sure the connector is securely inserted. (Check that the claw is at the mark on the HV cap shown as in Fig. 8-(l).)
0
Anode
connector
HV cap
(1) Lock on (when connector
is inserted)
Fig. 6 2. Remove the HV cap and remove the anode connector (Fig. 7). -1%
(2) Release (when connector
is iemoved) Fig. 8
46EXlB
EXPLODED
VIEW (2/3)
46EXlB
/
EXPLODED VIEW (313) (3/3)
-+a-+ @-S,"/
lk=Ak--7
w
P-49 . ..- ,w ..-
-14-
SPEAKER (L) CRT (R) CRT (G) CRT (8)
I
r
P-LINE
COMB
CONVERGENCE CORRECTION
WE
UHF/VHF
I
IN
CONTROL F%`B
46EXl B
REPLACEMENT PARTS LIST
PRODUCT SAFETY NOTE: Components marked with a A have special characteristics important to safety. Before replacing any of these components, read carefully the PRODUCT SAFETY NOTICE of this Service Manual. Don't degrade the safety of the receiver through improper servicing.
r
SYMBOL NO. PART NO. DESCRIPTION CABINET a 1 2 3 4 5 6 7 8 9 IO 11 13 14 15 16 18 19 21 22 23 24 25 26 27 28 30 31 4304556 3209674 4288068 3700971 4618171 4305083 4305082 4524911 3785043 4137976 4159427 4518772 4331941 3811195 3332453 3821103 4335872 3746482 3209495 4520771 3123071 4137975 3794331 4519503 4520232 4336491 3447251 CRT UNIT BRACKET (HHEA MD) CONTROL PANEL ASSY MIRROR (HHEA MD) LEAD CLAMP RUBBER SPACER A LENS-CRT UNIT METAL SUPPORT LENS-CRT UNIT METAL SUPPORT R HEXAGON FLANGEHEAD 4X12 PUSH LOCK A 4X20 TAPPING SCREW W/WASHER 3X10 TAPPING SCREW W/WASHER 3X12 TNE MIRROR HOLDER U POWER KNOB SPRING FOR KNOB DOOR ASSY MIRROR HOLDER (HHEA MD) WIRE CLAMP TERMINAL BOARD ASSY 4X18 TAPPING SCREW WiWASHER CABINET ASSY (HHEA MD) 4X16 ZA R SCREW PRESET DRIVER 3X12 TAPPING SCREW 4X16 DT SCREW CASTER METAL UNIT METAL COVER (A) SYMBOL NO. 32 34 35 37 38 39 40 41 42 43 a 49 Q 50 a 51 PART NO. 3447252 3169681 4321071 3169691 4304282 4517997 3727972 3850473 3850474 3189482 4866863 4866862 4866861 DESCRIPTION UNIT METAL COVER (B) REAR BOARD (HHEA MD) SPEAKER COVER LOWER REAR BOARD (HHEA MD) COVER NET 4X12 SELF TAPPING SCREW Holder, AC Line Cord Screen Frame (H) Screen Frame (V) SCREEN ASSY (HHiA MD) LENS CRT BLOCK ASSY B (HHEA MD) LENS CRT BLOCK ASSY G (HHEA MD) LENS CRT BLOCK ASSY R (HHEA MD)
f
MISCELLANEOUS 3700732 2442842 2982471 2573442 2573621 2742559 3772201 3739671 4917312 2412921 2412921 2692481 2692461 2692481 LENS DELTA 12P W/O C (HHEA MD) DEFLECTION YOKE 300-75 VHF ADAPTER REM. CONT. CLU-GOOPR (HHEA MD) REM. CONTROL CLU-609 (HHEA MD) AC POWER CORD AC CORD HOLDER CORD HOLDER OPERATING GUIDE SPEAKER 160mm SPEAKER 160mm FOCUS LEAD WIRE (HHEA MD) FOCUS LEAD WIRE (HHEA MD) FOCUS LEAD WIRE (HHEA MD)
A
A 2
El01 E202 E301 E302 E9001
EE N201 Q SP401 Ld SP402 W811B W811G W811R
2994843
Mini plug w/ coax cable
46EXl B
MEMO
-19-
l
@
HITACHI
(AMERICA), INC.
Blvd., Norcross, GA 30093 Tel. 404-279-5800 Tel. Tel. Tel. Tel. 31 O-537-8383 201-935-8980 708-593-l 550 404-279-5660 3890 Steve Reynolds 401 West Artesia Blvd., Compton, CA 90220 1200 Wall St. West, Lyndhurst, NJ 07071 1400 Morse Ave., Elk Grove Village, Illinois 60007 3890 Steve Reynolds Blvd., Norcross, Georgia 30093
HITACHI HOME ELECTRONICS
NATIONAL HEADQUARTERS
OFFICE:
Western Regional Office: Eastern Regional Office: Mid-Western Regional Office: Southern Regional Office:
HITACHI SALES CORPORATION
3219 Koapaka Street, Honolulu,
OF HAWAII, INC.
Tel. 808-836-3621
Hawaii 96819
HITACHI SALES CORPORATION
DE PANAMA,
S.A.
Tel. 63-6491 Tel. 63-6500
Centro Comercial Plaza Balboa, Punta Paitilla PO. Box 7657, Panama 5, Republic of Panama