28HW-53 (serv.man24). Simplified procedure for the G2 and Grey Scale adjustments — Sharp TV Technical Bulletin (repair manual)

Model
28HW-53 (serv.man24)
Pages
1 Few pages! See other manuals at the bottom of the first or last page.
Size
11.72 KB
Type
PDF
Document
Technical Bulletin
Brand
Device
TV / CTR / Simplified procedure for the G2 and Grey Scale adjustments
File
28hw-53-sm24.pdf
Date

View Sharp 28HW-53 (serv.man24) Technical Bulletin online

CTV2000 01 04
Month of Issue: March 2002
        
Classification: 
         White
TELEVISION TECHNICAL BULLETIN
Page 1 of 1
Sharp Electronics (UK) Limited
Reference JC180100 - 1
Revision 4
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
56FW53H
66FW53H
66FW54H
76FW53H
76FW54H
59ESD7H
66ESD7H
66GF63H
66GF64H
76GF63H
76GF64H
28HW53H
32HW53H
REASON
Simplified procedure for the G2 and Grey Scale adjustments.
ACTION
Follow the procedure below to set the G2 and Grey scale.
1.  Tune the set to the output of a RF signal generator.
2.  In the user menu, set the picture levels to the FACTORY settings.
3.  In the user menu, set the tint control to its central position.
4.  Enter the test mode (see the service manual for procedure).
5.  Set the ABL levels in the NVM by adjusting positions 60, 61, 62, 63, 64 and 65 on page 00 to read
80.  Store each location by pressing the standby button on the remote control.
6.  When the ABL levels have been set, adjust the G2 and grey scale (if necessary) as below.
G2 Adjustment
 
i.  After setting the ABL levels as above, go to the Red Cut Off adjustment.  The following data will
appear on the screen.
(RED)
  (GREEN)
(BLUE)
(GAIN)
**
**
**
(CUT OFF)
e.g. 70
**
**
 
ii.  Using a cross hatch pattern set the G2 control on the line output transformer so that the display in the
red cut off box reads between 60 and 80 as indicated above.
 
iii.  Re-set at least one of the RGB adjustments to force the software to re-set the correct ABL levels.  It
is suggested that if the grey-scale is good one of RGB gains be adjusted by one point.
Grey Scale Adjustment
 
i.  Using a grey scale pattern set the Red Cut-off value to 32 and the Red Gain value to 50.
 
ii.  Leave the Red Cut Off and Gain as above and adjust Green and Blue Cut-off and Gain to achieve
correct grey scale tracking.  As with all grey scale adjustments it will be necessary to re-adjust the
settings to achieve good tracking.
Notes
1.  There is no need to store any of the gain or drive settings.
2.  When adjusting the grey scale, the figures displayed in the boxes are an indication of the CRT’s
performance only.
3.  These adjustments are for guidance only.  If any problems should be encountered the adjustments
should be carried out using a Colorimeter as explained in the service manual.
Display

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  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).