DOWNLOAD Sharp 66DW-18H (serv.man2) Service Manual ↓ Size: 333.82 KB | Pages: 13 in PDF or view online for FREE

Model
66DW-18H (serv.man2)
Pages
13
Size
333.82 KB
Type
PDF
Document
Service Manual
Brand
Device
TV / CTR / Fault finding guide
File
66dw-18h-sm2.pdf
Date

Sharp 66DW-18H (serv.man2) Service Manual ▷ View online

Sharp Electronics (UK) Limited
Originator AvW   Supervisor                        Approval Date    /   /     Reference GE84300X
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
CTV990104
Month of Issue: January 1999
        Classification:                White
TELEVISION TECHNICAL BULLETIN
Page 1 of 1
MODELS
66DW18H
76DW18H
SYMPTOM While in the NTSC mode, colour or sync may be lost.
CAUSE
Corruption of the EPROM data.
ACTION
Change the EPROM, using the part number given below.
REF NO
DESCRIPTION
PART NUMBER
PRICE CODE
IC1004
EPROM, 66DW18H
CH-IX1642CJH0
AZ
IC1004
EPROM, 76DW18H
CH-IX1642CJH1
AX
Sharp Electronics (UK) Limited
Originator AvW   Supervisor                        Approval Date    /   /     Reference SP84300X
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
CTV990105
Month of Issue: January 1999
        Classification:                White
TELEVISION TECHNICAL BULLETIN
Page 1 of 1
MODELS
66DW18H
76DW18H
SYMPTOM Poor teletext performance.
CAUSE
Poor video signal level into the teletext decoder and errors in the EPROM data.
ACTION
Carry out the following circuit change.
1.  Change R447 (connected to pin 9 of IC401) with a 0R jumper.
2.  Change the EPROM (IC1004) with the one listed below.
REF NO
DESCRIPTION
PART NUMBER
PRICE CODE
IC1004
EPROM, 66DW18H
CH-IX1642CJH0
AZ
IC1004
EPROM, 76DW18H
CH-IX1642CJH1
AX
R447
SMD resistor, 0R
VRS-TV1JD000J
AA
Sharp Electronics (UK) Limited
Originator AvW   Supervisor                        Approval Date    /   /     Reference GE84600X
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
CTV990106
Month of Issue: January 1999
        Classification:                White
TELEVISION TECHNICAL BULLETIN
Page 1 of 1
MODELS
66DW18H
76DW18H
SYMPTOM In the RGB mode, the picture is displaced to the right.
CAUSE
Error in the EEPROM data.
ACTION
While in the service mode, change the data in the following location.
NVM Page : 
08
NVM Address : 
5C
Data : 
45 (was 36)
Sharp Electronics (UK) Limited
Reference AM270799
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
CTV990707
Month of Issue: July 1999
        Classification:         White
TELEVISION TECHNICAL BULLETIN
Page 1 of 1
MODELS
66DW18H
76DW18H
SYMPTOM No picture - blank raster.
CAUSE
R1810, R1811 and R1812 changing in value.
ACTION
Replace R1810, R1811 and R1812.
REF NO
DESCRIPTION
PART NUMBER
PRICE CODE
R1810
Resistor 33k
, 1/8W
VRD-RA2BE333J
AB
R1811
Resistor 33k
, 1/8W
VRD-RA2BE333J
AB
R1812
Resistor 33k
. 1/8W
VRD-RA2BE333J
AB
Location of R1810, R1811 and R1812 on the CRT PWB
Sharp Electronics (UK) Limited
Reference UK84602X
Revision  1
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units
CTV991003
Month of Issue: October 1999
        Classification:                White
TELEVISION TECHNICAL BULLETIN
Page 1 of 1
MODELS
66DW18H
76DW18H
SYMPTOM Failure of Q509.
CAUSE
Excessive excursions of the positive forty volt supply from the line stage.
ACTION
Fit an extra zener diode, D632, in the position of R626 as shown in the diagram below.
Note  that  this  diode  has  been  fitted  during  production  as  of  the  following  serial
numbers.
 66DW18H  - 
712620
76DW18H 
714463
REF NO
DESCRIPTION
PART NUMBER
PRICE CODE
D632
Zener diode, 47V
RH-EX0431BMZZ
AA
40V
R611
D608
D632
C621
R626
Sharp Electronics (UK) Limited
Reference UK93000X
Revision  1
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units
CTV991004
Month of Issue: October 1999
        Classification:                White
TELEVISION TECHNICAL BULLETIN
Page 1 of 1
MODELS
66DW18H
76DW18H
SYMPTOM The reciever does not turn on - mains fuse blown.
CAUSE
Bridge rectifier diodes short circuit (D701, D702, D703 and D704).
ACTION
Replace D701, D702, D703 and D704 with the part specified below.
REF NO
DESCRIPTION
PART NUMBER
PRICE CODE
D701
Diode, RM4ALF-L1
RH-DX0317BMZZ
AD
D702
Diode, RM4ALF-L1
RH-DX0317BMZZ
AD
D703
Diode, RM4ALF-L1
RH-DX0317BMZZ
AD
D704
Diode, RM4ALF-L1
RH-DX0317BMZZ
AD
New
Old
   D703
D701
D704
D702
Sharp Electronics (UK) Limited
Originator AvW   Supervisor                        Approval Date    /   /     Reference SP84001X
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
CTV990107
Month of Issue:    January 1999
        Classification:                   White
TELEVISION TECHNICAL BULLETIN
Page 1 of 3
MODELS
66DW18H
REASON
During production, the CRT has been changed from a Philips to a Thomson type.
ACTION
When replacing a Philips CRT for a Thomson one, carry out the following.
1.  Replace the CRT.
2.  Replace wires FH, FV and KC as indicated on the following pages.
3.  Replace R609 with a 2.2R, 5% 2W resistor.
4.  Replace C601 with a 8.2nF, 1.5kV capacitor.
5.  Add a 4.7nF, 1.6kV capacitor in parrelel with C601.  This is screen printed on the
top of the mother PWB as C633 (see page 9 of the service manual).
6.  Remove SMD resistor R804.
7.  On the CRT socket PWB, add two 100nF, 5% 63V capacitors, designated C1860
and C1862 (see page 11 of the service manual – component side of the PWB).
When replacing a Thomson CRT for a Philips one, carry out the reverse of the above.
REF NO
DESCRIPTION
PART NUMBER
PRICE CODE
VB
66cm CRT, 16:9
VB66EGV2322*N
CT
KC
Wire lead
QCNW-2775BMZZ
AF
R609
Resistor, 2.2R, 2W
VRN-VV3DB2R2J
AA
C601
Capacitor 8.2nF, 1.5kV
RC-FZ0147BMZZ
AE
C633
Capacitor 4.7nF, 1.5kV
RC-FZ0148BMZZ
AD
C1860
Capacitor 100nf, 63V
RC-FZ9104BMNJ
AB
C1862
Capacitor 100nf, 63V
RC-FZ9104BMNJ
AB
Sharp Electronics (UK) Limited
Originator AvW   Supervisor                        Approval Date    /   /     Reference SP84001X
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
CTV990107
Month of Issue:    January 1999
        Classification:                   White
TELEVISION TECHNICAL BULLETIN
Page 2 of 3
THOMSON PICTURE TUBE
                                                                                                       Red          Orange       Yellow                Green
                                                                                                          FH lead                       FV lead
To change the deflection yoke wiring from a Philips CRT to a Thomson CRT, proceed as
follows.
1.  Unsolder the red and orange FH leads from the deflection yoke.
2.  Remove connector 1 from the yellow and green leads.
3.  Strip the yellow and green wires of insulation (about 4mm).
4.  Solder the red and orange (FH) leads as shown above.
5.  Solder the yellow and green (FV) leads as shown above.
6. Replace 
lead 
KC 
(QCNW-2757BMZZ) connects the CRT socket to the neck of the CRT
with QCNW-2775BMZZ type.
KC lead
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