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1
7.3 TROUBLE SHOOTING
• Counter measures
The improved point with running change(MP electricity problem)
A
No. items
Symptoms
1 The audio
_The noise such
output is
as the hams
abnormal.
occurs.
_The sound is
not emitted.
B
2 The screen
_It seems that
becomes like
brightness goes
C
white.
up when the
video signal of
specific VTR is
input.
3 Service
The User
mode
MENU is
problem
initialized when
the service
mode entered .
D
E
F
78
1
2
Provisional
Cause
measure
The Control
The voltage of the
voltage margin
microcomputer is
was insufficient
improved.
of audio selector
Changed the
IC.
resistor
JP model:R50
200 Ω (1%)
210 Ω (1%) :
US & GA
model: R468
11K (1%)
10K (1%)
This case is
VTR is limited as
generated by Y
spec.
level of the Sync
level AGC.
Specification
change
PDP-505MX
2
3
Serial NO. for
Permanent
Provisional
measures
measure
JP 42inch:
The level shift
EITY002266JP
circuit is added to
JP 50inch:
the control line
EITY002872JP
from the
microcomputer and
US 42inch:
the control voltage
EITY002256UC
is improved.
US 50inch:
(Board Assy
EITY002566UC
modification).
GA 42inch:
three of Transistor
EITY002866EH
and nine of
GA 50inch:
resistance
EITY002870EH
additions.
---
The firmware is
improved, and the
AGC function is
deleted.
JP model : Ver1.5
US&GA : Ver1.6
---
The firmware is
changed, and
service MENU is
added.
JP model : ver1.3
US&GA : ver1.3
3
4
Permanent
measures
beginning lot
synchronized to the
mentioned board
assy modifications.
---
OK since this serial
NO.
JP 42inch:
EITY002766JP
JP 50inch:
EITY002872JP
US 42inch:
EITY002868UC
US 50inch:
EITY003774UC
GA 42inch:
EITY002866EH
GA 50inch:
EITY002870EH
4
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