Text preview for : 46UX7B.pdf part of Hitachi 46UX7B Hitachi Projection Color Television
Models: 46UX7B, 46UX7K
Chassis: AP13
Service Manual
Back to : Hitachi_46UX7B.rar | Home
CONTENTS
This service manual gives differences between the 46UX78/K and 5OUX78/K/W. For any other information, see the 50UX7B/K/W Service Manual YK No. 0403E issued in May, 1991.
SAFETY PRECAUTIONS ....................................................... TECHNICAL CAUTIONS ....................................................... SPECIFICATIONS...: ......................................................... CIRCUIT PROTE(=TION ........................................................ GENERAL INFORMATION. ..................................................... CONVERGENCE ADJUSTMENT ................................................ CAUTIONS WHEN CONNECTINGIDISCONNECTlNG THE HV CONNECTOR EXPLODEDVIEW .......................................................... WIRING DlAGRAM............................................................i REPLACEMENT PARTS LIST .................................................. 2 5 6 6 7 9 ,I1 ..I 2 5 .I7
...........
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.SUWECT TO CtiANGE FOR IMPROVEMENT
PROJECTION COLOR TELEVISION
August 1991 HHEA - MANUFACTURING DIVISION
46UX7B/K
/
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 might 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.
(Reading should not be above 0.5 mA)
I
Test all exposed surfaces
metal r4
(Using AC adapter plug as required)
*
GROUND
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.
I
High Impedance! H.V. meter
Deflection
P.W.B.
46UX7B/K
g. X-radiation - TUBE: The primary source of Xradiation in this receiver is the picture tube. The tube utilized for the above mentioned function in this chassis is specially constructed to limit X-radiation emissions. 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 excessive high voltage, avoid being unnecessarily close to the picture tube and the high voltage component. Do not operate the chassis longer than is necessary to locate the cause of excessive 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 shield 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 cabinet, 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 for shielding Shield mounting plate E
bracket)
Shield plate B (install on CRT mounting bracket) mounting Shield cover B (Install on CRT mounting bracket)
mounting
bracket)
bracket)
Detailing
X-radiation Fig. I 3
shields
46UX7B/K
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 a voltage 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.
46UX7BlK
TECHNICAL
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 120V. 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.
CAUTIONS
5. Turn the 20kQ-B VR 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.
Chassis
ground
,
Deflectioi
f?W.B.
High Impedance H.V. meter
POWER
SUPPLY
F?W.B. (Front
View)
20kQ-B JIG
Fig. 2 5
46UX7BlK
I
SPECIFICATIONS
Model: Cathode-Ray Tube: 46UX7B/K 80° deflection 7 inch (180CZB22R/180CGB22G/ 180CZB22B) 120 volts AC, 60Hz 310 watts - Maximum 210 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 - 10 watts rms per channel, 8 ohm impedance. Rear - 5 watts rms per channel, 8 ohm impedance. Anode Voltage: Brightness: Speakers: 30.0 kV (Zero Beam Current) 600 ft-L Nominal (Peak White) 2 Woofers - 6 inch (16 cm) round 2 Tweeters - 2 inch (5 cm) round Width . . . . . . . . . . . . .393/4" Height . . . . . . . . . . . .483/8" Depth. . . . . . . . . . . . .263/' Weight . . . . . . . . . .210 Ibs. CPT (9) PCB. CPT (G) l?C.B. CPT (R) P.C.B. Convergence Correction PCB. Signal l?C.B. Power Supply PCB. Deflection PCB. 3-Way PC. 9. Pro-Logic f?C.B. P in P Selector P.C.B. SP Terminal P.C.B. Control PC. B.
Power Input: Power Consumption: Antenna impedance: Receiving Channel:
Dimension:
Circuit Board Assemblies:
Intermediate
Frequency:
Video Video Audio Stereo Audio
Input: Output: Input: Audio Output: Output Power:
CIRCUIT PROTECTION
46UX7B/K
GENERAL
INFORMATION
V SYNC POWER button INPUT
knob BALANCE knob
1 7 0 POWER
Fig. 3 Control 7
Panel
46UX7B/K
/
INPUT INPUT AUDIO
1 jacks 2 jacks, TO HI-FI INPUT jacks 3 jacks
VHF/UHF
REAR SPEAKER
I
AUX
I Rear speaker terminal
Fig. 4 Monitor Connection
Panel
8
46UX7B/K
CONVERGENCE
Static Convergence 1 MENU 1
ADJUSTMENT
1
' 1. PROGRAM LIST
2. 3. 4. 5.
STATION MEMORY CHILD LOCK CONVERGENCE AUTO DEMO
PUSH NO. TO SELECT
PUSH MENU TO END
Use button on Remote to align colors to form white lines Remote Control
RED
BLUE :
Vertical Position
to 21
to 8-I
RED
BLUE
Horizontal
Position
PEDi
L BLUE J
1
1
NORMAL VIEWING
46UX7B/K
Dynamic Convergence
_.___.___._._.-.-.-.-.-.-.-.-.-.
I
1 RED/BLUE
I
DYNAM,C
CONVERGENCE
I.-.-.-.-.-.-.-.-.-.-.-.-.-.-.I
i
1
n"".LlN,
E
t-;i
,t-~;;~
t"`"]
E
fi
fM+
5
1
,L3WMj
i*i",
I"ii",
fS,Zi,,
,ii"`Nii,
li"`w,
ii"",
(+I),
ic"l
j
RH-L -SIZE i
LIEi 1 f-L.LtN, ,BH.SfW, ,"HTW, (SIX, ,fLM,, [K'F, li"", 1"""31 EfPlN, Et+L .SIZE ;
;---t t t I t I I
------------------`-----------------------~------------------------------~, GV-PIN-PHASE GV-KEY G"-U-KEY GV-PIN GV-U -PIN i
UEJ .-.-.-.-.e GV-CENTER --E
GH-PIN-PHASE
GH-KEY
GII-U-KEY
GH-PIN
GH-U -PIN
i
GH-CENTER
i
al
t ;.-.-.-.-.-.-.-.-.-
.-.-.-
GREENGEOMETR,CCORRECT,ON .-.-.-.-.-.-
.-.-.-.-.-.-.
`m
Layout of the Adjustment
VR
CONVERGENCE CORRECTION P.C.8
n n n n
R2 139 R2140 R2185 R2186
RH-L -SIZE
Et+L .SIZE
GV-CENTER
GH-CENTER
46UX7B/K
CAUTIONS
WHEN CONNECTING/DISCONNECTlNG
THE HV CONNECTOR
Perform the following when the HV connector (anode connector) is removed or inserted for CPT replacement, etc.
-
Anode connector Anode connector
/
Deflection P.W.B.
FBT
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 The lock will release with a click. (The state in a. Fig. 8-(l) 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).)
Anode
connector
0 HV cap
Mark HV cap
(1) Lock on (when connector
is inserted)
Fig. 6 2. Remove the HV cap and remove the anode connector (Fig. 7). 11
(2) Release (when connector
is removed) Fig. 8
46UX7B/K
/
EXPLODED
VIEW (l/3)
46UX7B/K
EXPLODED
VIEW (2/3)
46UX7B/K
/
EXPLODED VIEW (3/3) @----P I7 P--cc
46UX7B/K
REPLACEMENT PARTS LIST
PRODUCT SAFETY NOTE: Components marked with a Lb 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.
SYMBOL NO.
PART NO.
DESCRIPTION CABINET
SYMBOL NO. 17 18 19 22 24 27 28 31 32 33 A 41 Lb 42 A 43 44
PART NO. 4304343 3209492 3853201 4329271 4522901 4519503 4520232 3447251 3447252 4519512 4866383 4866382 4866381 4530841 H410241 3470951 8781638
DESCRIPTION BACK COVER SUPPORT METAL TERMINAL BOARD ASSY SUPPORT METAL COVER WASHER (F) NUT 3X12 TAPPING SCREW 4X16 DT SCREW UNIT METAL COVER (A) UNIT METAL COVER (B) TAPPING SCREW 4X16MM LENS CRT B ASSY B (HHEA MD) LENS CRT B ASSY G (HHEA MD) LENS CRT B ASSY R (HHEA MD) HEXAGON BOLT & W ASSY 4X16 CASTER (HHEA MD) CASTER BASE (HHEA MD) 4X12 TAPPING SCREW
1
2 3 6 9 15 20 21 21
23 25 26 29 30 34 35 36 37 38 39 40
3209672 3785043 3811195 3332453 3821102 3462207 3811971 4524911 4520771 4137975 3122991 3122992 3742021 4526351 4288066 3794331 3483211 4618172 4524912 3169602 4304282 4517997 3727972 3850473 3850474 3189412
CONTROL PANEL ASSY PUSH LOCK A POWER KNOB SPRING FOR KNOB DOOR ASSY BACK COVER (HHEA MD) BACK COVER DOOR HEXAGON FLANGEHEAD 4X12 4X18 TAPPING SCREW W/WASHER 4X16 .?!A R SCREW CABINET ASSY B (HHEA MD) CABINET ASSY K (HHEA MD) LEAD HOLDER (CABINET) SPACER K55 UPPER MIRROR PRESET DRIVER SPEAKER COVER RUBBER SPACER HEXAGON FLANGEHEAD 4X16 REAR BOARD (HHEA MD) COVER NET 4X12 SELF TAPPING SCREW HOLDER-AC LINE CORD SCREEN FRAME (H) SCREEN FRAME (V) SCREEN ASSY (HHEA MD)
MISCELLANEOUS A a El01 ElOlG E103G El04 E104G Lb E105G E202 E301 E302 A E9001 ;i::i N201 Lb N200B Lb N200G Lb N200R a SP401 2 ;E A SP404 W811B W811G W811R 2 2443107 2443108 3810831 2774965 2774962 2774976 2982471 2573414 2573621 2742559 3772201 3739671 4917302 3393227 3393226 3393226 2414201 2414201 2410954 2410954 2692461 2692461 2692461 DEFLECTION YOKE V8-6.7ST DEFLECTION YOKE V8-6.7ST ASSY MAGNET SPACER BEAM ALIGN. MAGNET (HHEA MD) BEAM ALIGNMENT MAGNET FOCUS MAGNET (HHEA MD) 300-75 VHF ADAPTER REM. CONT. CLU-950GR (HHEA MD) REM. CONTROL CLU-609 (HHEA MD) AC POWER CORD ACCORDHOLDER CORD HOLDER OPERATING GUIDE LENS SASS SP B LENS SASS SP RG2 LENS SASS SP RG2 SPEAKER 16OMMN SPEAKER 16OMMN SPEAKER SODGB (HHEA MD) SPEAKER 50DGB (HHEA MD) FOCUS LEAD WIRE (HHEA MD) FOCUS LEAD WIRE (HHEA MD) FOCUS LEAD WIRE (HHEA MD)
LENS-CRT-CHASSIS BLOCK a 4 5 7 8 9 10 11 12 13 14 15 16 4304553 3700971 4305083 4305082 4524911 4159427 8781440 4518772 3716742 3746482 4520771 4520883 CRT UNIT BRACKET LEAD CLAMP LENS-CRT UNIT METAL SUPPORT L LENS-CRT UNIT METAL SUPPORT R HEXAGON FLANGEHEAD 4X12 3X10 TAPPING SCREW W/WASHER 3X10 TAPPING SCREW 3X12 TNE PLASTIC HOLDER WIRE CLAMP 4X18 TAPPING SCREW WIWASHER M3X12 SCREW WITH WASHER
17
46UX7B/K
MEMO
18
46UX7B/K
MEMO
19
l
@
HITACHI
(AMERICA), INC.
8lvd., Norcross, GA 30093 after 11-2-91 Tel. 404-279-5600 Tel. Tel. Tel. Tel. Tel. 213-537-8383 31 O-537-8383 20 l-935-8980 708-593-l 550 404-279-5600 3890 Steve Reynolds 401 West Artesia Blvd., Compton, CA 90220
HITACHI HOME ELECTRONICS
NATIONAL Western HEADQUARTERS Regional Off ice:
OFFICE:
Eastern Regional Off ice: Mid-Western Regional Office: Southern Regional Office:
1200 Wall St. West, Lyndhurst, NJ 07071 1400 Morse Ave., Elk Grove Village, Illinois 60007 3890 Steve Reynolds Blvd., Norcross, Georgia 30093
HITACHI SALES CORPORATION
3219 Koapaka Street, Honolulu, Hawaii
OF HAWAII, INC.
96819 Tel. 808-836-362 1
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