Pioneer SC-LX90, Service Manual

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SC-09TX
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5. DIAGNOSIS
5.1 DIAGNOSIS FLOWCART
5.1.1 SET DIAGNOSIS WITHOUT REMOVING BONNET
No sound
Specific device
Failure generated between
the input connector and
the switch circuitry
Confirmation of symptoms
• Is the sound from a specific device not output?
• Or sound from several devices not output?
1
Set the speaker setting for all channels to Large.
2
Set the function to Multi Ch In.
3
Set the listening mode to Pure Direct.
4
Fix the signal switch at Analog.
Determination of whether the analog or
digital circuitry is in failure
NG OK
Determination of whether the preamp
or power-amp block is in failure
• Is a signal output from the Preout connector?
Failure in the
power-amp block
NG OK
Failure in the analog
small-signal system
block
Determination of whether the AD line or
other digital system line is in failure
• Is the sound of the digital input output?
Set the signal selection to Auto.
NG OK
Failure in the
A/D converter
or its periphery
1
Input a PCM signal (signal from a CD, etc.).
2
Set the listening mode to Pure Direct (PCM Direct).
3
Set the signal switch to Auto or PCM.
Several devices
Determination of whether the DSP or other block is in failure
NG OK
Failure in the DSP
Failure in the DIR
Determination of whether the
DIR or other block is in failure
• When the signal selection is set to
Auto, is the input signal recognized as
digital? (Is the DIR locked at digital?)
Failure in the D/A
OK NG