Philips LX7500R, Service Manual

Page: 25 / 181

EN 25 5. LX7500R Diagnostic Software
servtest LX7500R sh 3, 051004
Press PLAY button.
Y
DISPLAY TEST
Back to main menu.
fig. 1
fig. 2
PLAY button
pressed?
N N
Y
Y
Y
N
Display shows all
segments and flags
for checking open circuits.
All LEDs are switched on.
See figure 1.
Display shows figure 2.
All alternate pins (2, 4, ..)
of the
µ
P display control pins
are activated
for checking short circuits.
See figure 2.
PLAY button
pressed?
STOP button
pressed?
PASS
Y
EEPROM TEST
Display shows
ERR
Display shows
Test pattern is written to
address 1
and
read back again
STOP button
pressed?
Test ok?
N
Y
N
Y
Press PLAY button.
Back to main menu.
Back to main menu.
Y
FORMAT EEPROM
Display shows
for 2s.
EEPROM is cleared and
default values are stored.
NEW
Press PLAY button.
The test checks writing and reading of data to EEPROM 7108 on Combi board.
A test pattern is written to the first location in the EEPROM.
PASS
is displayed when the test pattern is read back correctly, else
ERR
.
Each software module using the EEPROM is forced to write the
default values in its part of the EEPROM.
This test should only be used to clear the EEPROM in case
of a
µ
P-"hangup".
The DISPLAY test is intended to check the driver circuits
and the LEDs for open- or short-circuits.
Press
S
or
T
button
and select
EEPROM
Press
S
or
T
button
and select
DISPLAY
Press
S
or
T
button
and select
EP FORMAT