Servicing Note - Sony TA-AV571 Service Manual

[Fluorescent Indicator Tube, LED All Lit, and Key Check Mode]
1. When the plug is inserted into the outlet while pressing the
3 CLASSIC button, the fluorescent indicator tube and LED
will light up completely.
2. The mode changes as follows each time the 3 CLASSIS button
and DBFB ON/OFF button are pressed together after 1.
Sequence of Service Modes
Fluorescent Indicator
Tube and LED Check Mode
AMP check mode
KEY check mode
*1 For checking if the fluorescent indicator tube and LED are lit
completely
*2 When the AMP check mode is set, "AMP" is displayed on the
fluorescent indicator tube. As this mode is not used for servic-
ing, perform step 2 to enter the KEY check mode.
*3 When the KEY check mode is set, "KEY 0" is displayed on the
fluorescent indicator tube. Each press of the button is counted.
(This excludes the POWER button)
When all buttons are pressed, the AMP check mode is set.
Buttons pressed once will not be counted when pressed again.
3. To exit the test mode, press the POWER button.
SECTION 1

SERVICING NOTE

*1
• Press the 3 CLASSIC button and DBFB ON/OFF
button at the same time.
*2
• Press the 3 CLASSIC button and DBFB ON/OFF
button at the same time.
*3
• Press the 3 CLASSIC button and DBFB ON/OFF
button at the same time.
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