15FS-25H (serv.man3) - Sharp TV Service Manual (repair manual)

15fs-25h (serv.man3) service manual
Model
15FS-25H (serv.man3)
Pages
44
Size
4.58 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / CTR
File
15fs-25h-sm3.pdf
Date

Read Sharp 15FS-25H (serv.man3) Service Manual online

1
15JF-25H
GA-1E CHASSIS
    MODEL 
15JF-25H
Issued: 30
th
 Sept. 2002
SERVICE MANUAL
SHARP  CORPORATION
    
  PAL I SYSTEM COLOUR TELEVISION
   
SE0015JF25H00
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.
ELECTRICAL SPECIFICATION ....................... 3
IMPORTANT SERVICING NOTES .................. 4
CONTROLS & TERMINALS ............................ 5
SERVICE ADJUSTMENTS .............................. 6
CHASSIS LAYOUTS ....................................... 14
LED FLASHING CODES ................................ 15
PRINTED WIRING BOARDS ......................... 15
ICs ADDITIONAL INFORMATION ............. 20
SCHEMATIC DIAGRAMS ............................. 26
BLOCK DIAGRAMS ...................................... 32
TROUBLESHOOTING TABLES .................... 34
PARTS  LISTING ........................................... 37
ACCESSORIES ............................................... 42
SOURCE OF DOCUMENTATION ................ 42
CONTENTS
15JF-25H
2
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
15JF-25H
ELECTRICAL SPECIFICATIONS
•Sweep Deflection ..................................... Magnetic
•Picture Intermediate frequency .................  38.9 MHz
•Sound  Carrier Trap .................................. 32.9 MHz
•Adjacent  Sound Carrier Trap ................... 40.9 MHz
•Adjacent  Picture  Carrier Trap ................. 30.9 MHz
.
•Aerial Input Impedance
VHF/UHF ...................... 75 ohm Unbalanced
•Tuning Ranges........... 45.75 MHz thru 855.25 MHz
VHF.................... IR A-J
VHF .................. S1 - S41 (HYPERBAND)
UHF .................. I21 - I69 CH
•White Level
Set brightness control to get total picture tube cathode current of 
900 µA under no signal condition.
Maximum necessary correction of each picture tube cathode current to get 8900 degrees
 
K-20 MPCD
screen temperature should not exceed 15% of its original value.
X=0.290 ± 0.015         Y=0.284 ± 0.015
                                            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 (Method IEC60107) ............ 37W
Stand-by Operation ............................................ 3W
•Audio Power Output Rating ........................ 2 W (MPO)
Speaker .............................. 16
Ω, 
4W, 9 x 5 cm, 1pc
•Convergence ............................... Self Converging System
•Focus ....................... High Bi-Potential Electrostatic
15JF-25H
4
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.
• 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 27.5 KV, (at a
instantaneous beam current of 1000
µA
)
.
2. Ensure that during normal operation the EHT does not exceed 24.5 KV±1.5KV (at a beam current of
900
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.
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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Here you can read online and download Sharp 15FS-25H (serv.man3) Service Manual in PDF. 15FS-25H (serv.man3) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp 15FS-25H (serv.man3) CTR. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.