Technics SL-PS670D

m@ Troubleshooting Guide
| No CD playback |
Does
the test disc
rotate?
YES
NO
Check
if TOC reading is
performed
NO
‘PLAY” appear on
he display?
| SL-PS670A
SL-PS670A
Remove the test disc
Turn on close detect
switch (S782)
Does
optical pickup
move?
NO
At about 0.5 Vp-p
Playing time appear
on the display
Are there
Outputs at pins
@ and ® of
1C702?
@ BCLK
@) LRCK OK
@ SRDATA
NG
Are there
outputs at pins
@and@of
|C702?
OK
NO
v
1C702 failure Check the unit 1C702 failure
aos
Without
25V+1.25V
limit.
1C702 failure
No waveform or upper
and lower amplitudes
are not equal.
lens make vertical NO
jovements?
YES
Does
laser diode
come on?
an output at pin NO
@ of IC 702?
OK
YES
IC702 failure
Load the test disc
NG
Turn on close detect
switch (S782)
hes
pene
1C708
failure
Remains
at "H?
Check
pin @ of lIC701
(RFDET)
Changes from
Ht tL
Remains
at"H” Check
pin @ of IC702
(FLOCK)
Check
pin @ of IC701
(FEOUT)
Upper and lower
amplitudes of
waveform are equal.
AS
s there
an output at pin
@ of |C702?
(FBAL)
Within
25V+1.25V
limit.
Optical pickup :
|C702 failure 1C702 failure
-~27-
Changes from
“H" to tL"
Optical pickup moves toward inner
track once, and then toward outer
track slightly (2 or 3 mm).
0.4 V
Above 0.4 V
Q751 or optical
pickup is defective
1C701 failure
Is there
an output at pin
@ of |C702?
Cc
Changes from
2.5 V to “L”
(High impedance)
{C703 failure
Is there
an output at pin
of 1C7027
FOD)
Remain at 2.5 V
(High impedance)
1C702 failure
At outer or around
middle track
Check the
position of optical
| At inner track
Inner track limit switch
is defective or
disconnected
outputs at pins
@ and @ of
C703?
Traverse deck
failure
s there
an output at pin
@ of |C702?
(TRV)
1C702 failure IC703 failure
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