Read Sharp 28JF-73H (serv.man32) Technical Bulletin online
CTV2004 06 04
Date of Issue:
8
th
July 2004
Classification:
White
TELEVISION TECHNICAL BULLETIN
Page 1 of 3
Sharp Electronics (UK) Limited
Reference – JC 16 06 2004
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
MODELS 28JW73H 28JF73H
32JW73H
REASON
To improve the beam current protection reaction time, extra components have been
added to the circuit. This circuit is physically located underneath the line output
transformer (T601).
added to the circuit. This circuit is physically located underneath the line output
transformer (T601).
These changes have taken place from the following serial numbers
28JW73H
310
872260
32JW73H 310
518287
28JF73H
310
525170
ACTION
For models that have serial numbers higher than those given above, please note the
circuit changes outlined in this Technical Bulletin.
circuit changes outlined in this Technical Bulletin.
Notes
x D1307 was originally a 5.2V zener diode, but it was found that this made the circuit
x D1307 was originally a 5.2V zener diode, but it was found that this made the circuit
too sensitive to beam current variations and the set would turn off to standby either
on channel change or dark to bright scenes. To alleviate this it was changed to a
6.1V zener diode.
on channel change or dark to bright scenes. To alleviate this it was changed to a
6.1V zener diode.
x
It is advisable to change D1307 to a 6.1V zener diode (if not already carried out) to
prevent phosphor burn.
prevent phosphor burn.
REF NO DESCRIPTION PART
NUMBER PRICE
CODE
D1307 Zener
Diode
6.1V
RH-EX0584BMZZ
AA
C1336
Capacitor, 1
PF 50V
VCEA0A1HW105M AA
IC1303 IC,
UPC358G2
VHIUPC358G/-1
AE
J0018
Jumper Wire, 300mm
VW7UGB1-300KK
AA
J0019
Jumper Wire, 200mm
VW7UGB1-200KK
AA
Q1306 SMD
Transistor,
2SC3198
VS2SC3198-G-1
AA
R1323
SMD Resistor, 1M
:
VRS-CY1JF105G AA
R1324
SMD Resistor, 56k
:
VRS-CY1JF563G AA
R1325
SMD Resistor, 1.8M
:
VRS-CYJF185G AA
R1326
SMD Resistor, 2.2k
:
VRS-CYJF222J AA
R1327
SMD Resistor, 1k
:
VRS-CYJF102J AA
R1328
SMD Resistor, 56k
:
VRS-CYJF563J AA
R1329
SMD Resistor, 2.2k
:
VRS-CY1JF222J AA
CTV2004 06 04
Date of Issue:
8
th
July 2004
Classification:
White
TELEVISION TECHNICAL BULLETIN
Page 2 of 3
Sharp Electronics (UK) Limited
Reference – SP035101X
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
Schematic Diagram of the New Circuit
Loction of Components - Print Side of the PWB
CTV2004 06 04
Date of Issue:
8
th
July 2004
Classification:
White
TELEVISION TECHNICAL BULLETIN
Page 3 of 3
Sharp Electronics (UK) Limited
Reference – SP035101X
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
Loction of Components - Component Side of the PWB
