Read Sharp 21KF-80 (serv.man13) Service Manual online
1
21KF-80H
GA-1E CHASSIS
SERVICE MANUAL
SHARP CORPORATION
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.
regulations in some countries) the set should restored
to its original condition and only parts identical to
those specified should be used.
ELECTRICAL SPECIFICATIONS ..................... 3
IMPORTANT SERVICING NOTES .................. 4
CONTROLS & TERMINALS ............................. 5
ADJUSTMENT PROCEDURES ...................... 6
HOTEL MODE FUNCTIONS .......................... 12
LED FLASHING CODE ...................................13
CHASSIS LAYOUTS .......................................14
IMPORTANT SERVICING NOTES .................. 4
CONTROLS & TERMINALS ............................. 5
ADJUSTMENT PROCEDURES ...................... 6
HOTEL MODE FUNCTIONS .......................... 12
LED FLASHING CODE ...................................13
CHASSIS LAYOUTS .......................................14
CONTENTS
PRINTED WIRING BOARDS ........................... 15
ICs ADDITIONAL INFORMATION ..................20
SCHEMATIC DIAGRAMS .............................. 27
BLOCK DIAGRAMS ....................................... 33
TROUBLESHOOTING TABLES ...................... 36
PARTS LISTING ............................................. 39
SOURCE OF DOCUMENTATION ................. 43
ICs ADDITIONAL INFORMATION ..................20
SCHEMATIC DIAGRAMS .............................. 27
BLOCK DIAGRAMS ....................................... 33
TROUBLESHOOTING TABLES ...................... 36
PARTS LISTING ............................................. 39
SOURCE OF DOCUMENTATION ................. 43
MODEL
21KF-80H
PAL
I
SYSTEM COLOUR TELEVISION
Issued: 31
st
March 2003
SE0021KF80H00
2
21KF-80H
Service Manual update log sheet
Part No.
Technical Report No.
Technical Bulletin No.
Technical Bulletin No.
Cause / Solution
Page No.
Application
Data /Serial No.
Data /Serial No.
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).
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).
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21KF-80H
ELECTRICAL SPECIFICATIONS
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.
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
(Method IEC60107)
........ 49W
Stand-by Operation .................................. 3W
•
Audio Power Output Rating .............. 4W x 2 (MPO)
•
Speaker ............................ 16
Ω 4W, 12 x 5 cm, 2pcs
•
Convergence ................... Self Converging System
•
Focus ............................... 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 (HYPERBAND)
UHF ......................................... I21 - I69
CH
•
White Level
Set the brightness control, with no signal connected, so that the CRT cathode current is
600
µA. The maximum
correction applied to each cathode current to achieve a screen temperature of 8900 degrees K-20 MPCD
should not exceed 15% of its original value.
should not exceed 15% of its original value.
X=0.290 ± 0.015 Y=0.284 ± 0.015
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21KF-80H
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 disconnected from the receiver.
Note the following:
• The CRT in this receiver employs Integral Implosion Protection.
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 disconnected 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.
•
• 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:
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 31.0 KV,
(at a instantaneous beam current of 1200
(at a instantaneous beam current of 1200
µA).
2. Ensure that during normal operation the EHT does not exceed 27.5 KV±1.5KV (at a beam current of
1050
1050
µA). This level has been preset in the factory. Always check that this level has not been exceeded 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.
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.
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.
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.
