28HW-53 (serv.man9) — Sharp TV Service Manual (repair manual)

Model
28HW-53 (serv.man9)
Pages
44
Size
4.65 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / CTR
File
28hw-53-sm9.pdf
Date

View Sharp 28HW-53 (serv.man9) Service Manual online

1
28HW-53H
      MODEL 
 28HW-53H
CONTENTS
SHARP  CORPORATION
 PAL I 
  
SYSTEM COLOUR TELEVISION
SE
SG
28HW53H00
SERVICE MANUAL
In the interests of user safety (required by safety
regulations in some countries) the set should restored
to its original condition and only parts identical to
those specified should be used.
                Issued: 26th July 2001
DA-50W
 CHASSIS
ELECTRICAL SPECIFICATIONS......................3
IMPORTANT SERVICING NOTES....................4
ADJUSTMENTS PROCEDURES......................5
LED FLASHING CODES..................................10
PRINTED WIRING BOARDS................
............11
COMPONENT LOCATION TABLES.................18
SCHEMATIC DIAGRAMS.................................24
BLOCK DIAGRAM............................................32
PARTS LISTING...............................................33
PACKING OF THE SET & ACCESSORIES.....42
CONTROLS &TERMINALS..............................43
2
28HW-53H
Use this page to keep any special servicing information as Technical Report (Bulletin), Technical Information, etc.
If only part  number changes are required, just change part number directly the part number in the Parts Listing Section.
If you need more information, please refer to the Technical Report (Bulletin).
SERVICE MANUAL UPDATE LOG SHEET
Part No.
Technical Report  No.
Technical Bulletin No.
Cause / Solution
Page No.
Application
Data /Serial No.
3
28HW-53H
ELECTRICAL SPECIFICATIONS
•Convergence
Static (Centre) .. between any two colours
Dynamic .............. after static equals zero
•Focus ................ High Bi-Potential Electrostatic
•Sweep Deflection ............................... Magnetic
•Picture Intermediate frequency .......... 38.9MHz
•Sound  Carrier Trap ........................... 32.9MHz
•Adjacent  Sound Carrier Trap ............ 40.9MHz
•Adjacent  Picture  Carrier Trap ........... 30.9MHz
•Aerial Input Impedance
VHF/UHF ................. 75 ohm Unbalanced
•Tuning Ranges ..... 45.75MHz thru 855.25 MHz
VHF: IR A - J / S1 - S41 CH (Hiperband)
UHF: I21 - I69 CH
CATV Special Channels
•White Level
Set brightness control to get total picture tube cathode current of 600 milliammeter under no signal
condition. Maximum necessary correction of each picture tube cathode current to get 8900 de-
grees K-20 MPCD screen temperature should not exceed 15% of its original value.
X=0.290               Y=0.284
                                            WARNING
The chassis in this receiver is partially hot. Use an isolation transformer between the line cord plug
and power receptacle, when servicing this chassis.
To prevent electric shock, do not remove cover. No user-serviceable parts inside. Refer servicing to
qualified service personnel.
Specifications are subject to change without prior notice.
•Power Input ...................... 220V-240 Volts AC 50Hz
•Power Consumption
Normal Operation ...................................88W
Stand-by Operation ..................................1W
•Audio Power Output Rating (MPO) / Impedance
Internal Left Speaker ...................... 10W, 7
Internal Right Speaker .................... 10W, 7
•Speakers
Left / Right ....................................... 6 x 12cm
4
28HW-53H
IMPORTANT SERVICING NOTES
Only qualified service personnel are allowed to carry out maintenance and repair of this receiver.
SERVICING OF HIGH VOLTAGE SYSTEM AND CRT
It is important that the static charge is removed from the high voltage system when carrying out work
on the receiver. This can be achieved by connecting a 10K resistor (with a suitably insulated lead) from
the CRT cavity connector to the CRT ground tag. This must be carried out with the AC supply discon-
nected from the receiver.
Note the following:
 The CRT in this receiver employs Integral Implosion Protection.
 If the CRT has to  be changed  it  MUST  be  replaced  with  the  correct  type for continued safe
working
 DO NOT lift the CRT by its neck.
 When handing the CRT, ensure that shatterproof goggles are worn.
 Ensure that the CRT is discharge before handling.
X-RAY
This receiver is designed to keep any x-ray emission to an absolute minimum. Some fault conditions
and servicing procedures may produce potentially hazardous x-ray radiation levels. This is a problem
when in close proximity to the receiver for long  periods of time. To reduce any risks associated with
this, please observe the following precautions:
1. When undertaking any servicing on this chassis, DO NOT increase the EHT  to more than 32 KV,
   (at a instantaneous beam current of 1500
µΑ).
2. Ensure that during normal operation the EHT does not exceed 30KV
±
1.5KV (at a beam current of
1300
µΑ). This level has been preset in the factory. Always check that this level has not been ex-
ceeded after carrying out any repair on the receiver..
3. DO NOT replace the CRT with any other type than that specified in the parts listing as this may
   cause excessive x-ray radiation.
BEFORE RETURNING THE RECEIVER TO THE CUSTOMER
In addition to the above checks, the following should also be carried out before  returning the receiver
to the customer.
1. Inspect all the leads to ensure that they are dressed correctly and that they are not obstructed or
    pinched by any other parts.
2. Ensure that all protective devices are in good condition. These will include nonmetallic control
   knobs, insulating fish papers, cabinets backs, compartment covers or shields, mechanical insulators,
    etc.
Page of 44
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Download Sharp 28HW-53 (serv.man9) Service Manual (Repair Manual)

Here you can view online or download Sharp 28HW-53 (serv.man9) Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sharp 28HW-53 (serv.man9) CTR. Information contained in Sharp 28HW-53 (serv.man9) service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).