Pioneer AVIC-X940BT, Service Manual

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AVIC-X940BT/XNUC
52
1 2 3 4
1 2 3 4
C
D
F
A
B
E
5.3 DIAGNOSIS FLOWCHART
Is the image
in error?
Go to FE related repair process.
Is VD8,
VCC5 power
supply voltage OK?
Execute check 7.
Is AVCC5
voltage OK?
Execute
check 8.
Standby
OK?
Execute
check 1.
Is VDD5
(VCC33, VCC12)
power supply voltage OK?
Execute check 2.
Can the
playback
start?
Is SDRAM
IF OK?
Execute check 6.
Is DACCLK
normal?
Execute
check 9.
Is the audio
circuit OK?
Execute
check 10.
Is the video
circuit OK?
Execute
check 11.
Repair the defective part.
*1)Note
Normal?
NO
YES
YES YES
Is AVCC5
voltage OK?
Execute
check 8.
Reset OK?
Execute
check 3.
Is VSENS
OK?
Execute
check 4.
YES
YES
YES
YES
YES YES
YES
Go to FE section check.
YES
YES
NO NO NO
Go to FE section check.
NO
Replace the unit.
YES
YES
Normal?
YES
Go to FE section check.
Is 27 MHz
OK?
Execute check 5.
NO
YES
YES
START
END
END
Is FE section
normal?
Replace the unit.
YES
Go to FE section check.
NO
NO
NO
Does the operation take time?
Is the
life of flash
memory OK?
Conduct check
item 12.
YES
YES
NO
NO
Is the sound
in error?
Is the
USB play
in error?
Is the iPod play
in error?
Is 48 MHz
OK?
Execute
check 13.
Is the USB circuit OK?
Execute
check 14.
Is the iPod circuit OK?
Execute
check 14.
Go to the product check.
The product
is normal?(iPod
attestation IC)
YES
YES
Product repair
YES
NO
NO
NO
NO
YES
NO
YES
Replace the unit.
YES
Replace the unit.
YES
NO
NO
*1)
With service, even when exchange of a flash ROM
is required, please replace core unit . (Since the key etc. are not written in in case of the flash simple substance)
LS2 BACK END section flow
NO
NO
NO
NO
NO