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37DM-23H (serv.man17). Countermeasure to cure popping from the loudspeaker during switch on - Sharp TV Technical Bulletin (repair manual)

37dm-23h (serv.man17) technical bulletin
Model
37DM-23H (serv.man17)
Pages
2 Few pages! See other manuals at the bottom of the first or last page.
Size
17.01 KB
Type
PDF
Document
Technical Bulletin
Brand
Device
TV / CTR / Countermeasure to cure popping from the loudspeaker during switch on
File
37dm-23h-sm17.pdf
Date
Next: Sharp 37DM-23H (serv.man18) Technical Bulletin

Read Sharp 37DM-23H (serv.man17) Technical Bulletin online

Sharp Electronics (UK) Limited
Originator AvW   Supervisor                        Approval Date    /   /     Reference UK82500X
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units
CTV980807
Month of Issue: August 1998
        Classification:              White
TELEVISION TECHNICAL BULLETIN
Page 1 of 2
MODELS
51DT25H
37DM23H
37DT25H
SYMPTOM Counter measure to stop 'popping' from the loudspeaker at switch on.
CAUSE
Timing of muting circuit too slow.
ACTION
Check that the chassis version is N6.  If it is then procede as follows.
1. Remove 
C308.
2. Remove 
D301.
3. 
Change R316 to a 33k resistor (was 10k).
REF NO
DESCRIPTION
PART NUMBER
PRICE CODE
R316
Resistor 33k, 1/8W
VRD-RA2BE333J
AA
                                                                                                                   To  R306
                                                                                                                               C302
                                                                                                                                   Q305
                                                                                      R316
                                                                                                              R317
                                                                                                                                      R318
                  To Q501/Q1007
Circuit Diagram after modification
Sharp Electronics (UK) Limited
Originator AvW   Supervisor                        Approval Date    /   /     Reference UK82500X
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units
CTV980807
Month of Issue: August 1998
        Classification:              White
TELEVISION TECHNICAL BULLETIN
Page 2 of 2
Location of C308 on a version 6 Chassis
F7213BMN6
C308
D301
R316
T601
S701
IC1001
TU201
PWB-B
Page of 2
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Here you can read online and download Sharp 37DM-23H (serv.man17) Technical Bulletin in PDF. 37DM-23H (serv.man17) technical bulletin will guide through the process and help you recover, restore, fix, disassemble and repair Sharp 37DM-23H (serv.man17) 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.

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