Technics SL-PS900 Service Manual

SL-PS900
Mi
TROUBLESHOOTING
GUIDE
No CD playback
Does the test
YES
Turn
on
open/close
switch (S626)
Check if TOC NO
reading is performed.
Does “PLAY” appear
on the display?
Below 700 mV
or no output
Does lens make
vertical movements?
NO
Check output at
Playing
time
appear
on
the
display
:
pin
@
of
CN102
YES
At
about
1
Vp-p
Does laser diode NO
@
LRCK
fs
pin
@
of
1c30T~"
is
pin
@
of
1C102
come
on?
@
aan
OK
at
“HIGH”
or
“LOW”?
at
“HIGH”
or
“LOW”?
YES
A\
re
there
"
“HW
up
Is
pin
@
Measure
voltage
Below
0.5V
i oops
Rois
at
egos]
P<
of
10301
at
“HIGH”
Load
the
aciezs
Ole
and
1C804?
or
“LOW"?
test
disc
NO
wen
Is
there
an
output
NG
Is
pin
@
of
CN102
at
pin
@
of
1C102?
at
“HIGH”
or
"LOW"?
Turn on
open/close
Above
0.5V
switch (S626
{C801 or 1C803
and IC804 failure
Check waveform
between IC805~
808, 891, 892, 51
and JK801, 802
1C301
failure
OK
i
ad
R114
failure
1C102
failure;
1C301
failure
Check
10401
elegy
at
Optical pickup
failure
Check pin @ of
1€101
Measure
voltage
between © and ©
of Q101.
Above 0.6 V
Changes from
“H"
to
“L”.
Below
0.6
V
No
waveform
or
upper
and
lower
amplitudes
are
Remains
at
not
equal.
Check
pin
@
“H”
Check
pin
@
of
of
1C101.
CN102
Upper
and
lower
Changes
from
amplitudes
of
“H”
to
“L.
waveform
are
equal.
Optical
pickup
A
10301
or
10402
10101
failure
1C102
failure
failure
10101
failure
—
26—
—
27
—
Are there outputs
at pins © and @ of
Optical pickup
failure
NG
10103?
NG Is there an output
at pin @ of 16102?
1C102 failure 10103 failure
SL-PS900
SL-PS900
MINTER?
e Grid cor
[ao la um
e Anode ¢
e Pin cor

Technics SL-PS900 Specifications

General

Brand	Technics
Model	SL-PS900
Category	CD Player
Language	English