Front Panel Function Button is intermittent or Function is Incorrect (C_P0173).pdf

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CONFIDENTIAL
Service Bulletin
Computer Monitors
â
CSI-111
Sony Service Company
National Technical Services
A Division of Sony Electronics Inc.
Park Ridge, New Jersey 07656
173
Model:
CPD-100ES, CPD-200ES
No.
Subject:
Front Panel Function Button is intermittent or
Function is Incorrect
Date:
December 9, 1997
Symptom:
(222)
If, the front panel buttons, mainly the brightness and contrast buttons, are pressed,
other functions are activated different from the one shown by the On Screen Display.
This may be caused by the push buttons switch’s internal metal contact surfaces not
being smooth. This irregular surface causes higher contact resistance giving
incorrect push button signals.
Solution:
Then, please perform the following correction procedure.
1.
To ensure all switches are properly formed, push each Brightness and Contrast
button, FIRMLY, TEN times in succession. This will condition the switch
electrical contact surface to improve contact resistance. Switch should operate
properly for the life of the unit.
2.
If irregular operation persists, repeat Step 1.
3.
If irregular operation continues, then replace the switch(es) as required. See
parts list below.
REF
DESCRIPTION
PART NUMBER
S1801
BRIGHT + PB SWITCH
1-692-431-21
S1802
CONT + PB SWITCH
1-692-431-21
S1803
BRIGHT - PB SWITCH
1-692-431-21
S1809
CONT - PB SWITCH
1-692-431-21
The correction procedure is completed.
Reference: M. DeRosa, J. Grose
PRINTED IN USA
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