CD-E7 7 0
* Checking the DAC Unit of the Amplifier (A-E770/E970)
3-4.
No Sound Even When CD Player's PLAY Key is Pressed
<Sound output from other than digital source (CD)>
Is the 44.1kHz sampling indicator displayed?
YES
T
Are the CD player's "sec" display, etc, functioning?
• Is digital data being output from the digital OUT
terminal?
• Is there any input at pin 28 of the DIN terminal
vlC6 YM3623B of the F-6719t>oard in the amplifier?
(See waveform diagram 1.)
YES
Faulty vlC6 YM3623B in amplifier.
NO
Is the fiber-optic cable connected?
——Goto
®
NO
on page 11.
YES
NO
Connect the fiber-optic cable.
YES
Is the fiber-optic lighting?
;
\
!
\
\
\
NO
NO
Is digital data output from the emitter wQ8 on the
F-6110
board of the CD player?
(See waveform diagram 8,9.)
NO
YES
^
Faulty wQ8 on the
F-6110
board of the CD player or
wlC4 CXD1125QZ.
Faulty wlC5 on the
F-6110
board of the CD player.
Faulty amplifier
F-6178
vICI HFBR2550 vlC2, vlC4.
_vlC5 Check power supply.
• Is the waveform output from the TP5EFM terminal
of the CD player correct?
• Are there too few "L" level pulses at pin 23
(GFS terminal) of wlC6?
• Is the correct waveform output from the
RF terminal of TP1?
• Is there much fluctuation, etc, over
1
Vp-p?
YES
NO
*• Adjust focus tracking and VCO.
No change even after adjustment.
Faulty pickup.
• Is digital data being input from the CD player correctly?
• Does the waveform output from the emitter wQB on the
F-6110
board of the DC player change when switching
between STOP and PLAY
(see CD waveform diagrams 8 and 9).
Is there digital output from pin 17 (DO terminal) of
vlC6 on the
F-6179
of the amplifier?
PLAY recorded section exists, (see waveform diagram 1)
STOP, no recorded section.
NO
Faulty RAM
(IC5 CXKSBiePN,
etc) in
CD
player.
Faulty
CXD11 2 5 QZ.
YES
-jzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
,
sil
-V'
F-6179
board of CD player
)ofvlC11
-
Check data I/O
(LC7881).
Faulty vICI
(STM5807EP, etc.) and vlC12
3 (NJM2082D, etc) or vlC14 (NJM2082D).
10
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