37DT-25H (serv.man22). Countermeasure for height, tuning or video problems at switch on - Sharp TV Technical Bulletin (repair manual)

37dt-25h (serv.man22) technical bulletin
Model
37DT-25H (serv.man22)
Pages
2 Few pages! See other manuals at the bottom of the first or last page.
Size
79.59 KB
Type
PDF
Document
Technical Bulletin
Brand
Device
TV / CTR / Countermeasure for height, tuning or video problems at switch on
File
37dt-25h-sm22.pdf
Date

Read Sharp 37DT-25H (serv.man22) Technical Bulletin online

Sharp Electronics (UK) Limited
Reference UK84301X
Revision  2
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units
CTV981205
Month of Issue: December 1998
        Classification:
       White
TELEVISION TECHNICAL BULLETIN
Page 1 of 2
MODELS
37DM23H
37DT25H
37EM33H
37ET35H
51DT25H
SYMPTOM When the set is switched on from cold, intermittently there may be a lack of height, no
video or tuning problems.  If the set is turned off then on again, the fault may
disappear.
CAUSE
Noise from the CRT at switch on corrupting the operation of IC201.
ACTION
Refering to the diagrams below and on page 2, carry out the following circuit
improvement.
1. Add zener diodes D510 and D511to pins 63 and 64 of IC201.
2. Replace J122 with a 12uH peaking coil.
3. Add zener diode D403 to pin 30 of IC201.
REF NO
DESCRIPTION
PART NUMBER
PRICE CODE
D510/D511
Zener diode, 3.6V
RH-EX0404BMZZ
AB
J122
Coil, 12uH
VP-CF120K0000
AC
D403
Zener diode, 7.5V
RH-EX0412BMZZ
AB
Location of Additional Components on the Schematic Diagram
Sharp Electronics (UK) Limited
Reference UK84301X
Revision  2
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units
CTV981205
Month of Issue: December 1998
        Classification:
       White
TELEVISION TECHNICAL BULLETIN
Page 2 of 2
D510          D511
         SF201
                            T700
                                  J122
                                                                                                   Mother PWB (component side)
PLUG (K)
    D403
Location of Additional Parts on the Component Side of the Mother PWB
Page of 2
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Here you can read online and download Sharp 37DT-25H (serv.man22) Technical Bulletin in PDF. 37DT-25H (serv.man22) technical bulletin will guide through the process and help you recover, restore, fix, disassemble and repair Sharp 37DT-25H (serv.man22) 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.