Panasonic sa ak 58 schematic

Page 1

No CD playback

Dose
the test disc
rotate?

NO

Check
if TOC reading is
performed

NO

Dose
">"appear on
the display?

NO access

Playing time appear
on the display

Are there ii if ls pin
t uts al iris H of |C702 at
and (repel - "HIGH" or
lC702? LOW"?
NO .L.

lC702 failure Check the unit |C702 failure
N

R727 or R749
failure

|C703 failure

QU

Without
2.5 V 11.25 V 5 there

Im an output at pi
3'3 of IC702?

2.5 V
limit

IC702 failure

O ical pickup
failure

Below 700mV

Check or no output

output at of TJ7ot

At about i Vprp

oi IC702 at "L"

®
HIGH or LOW"7

an output at pin
17, of |C702'?

|C702 failure

U

5 there
an output at pin
14 of |C7037
(INS)

G

Measure
voltage between

iii and ii: of lC703
is 3.5V

Remove the test disc

Does
optical pickup
move?

Optical pickup
moves toward
inner track once.
and then toward
outer track slightly
(2 or 3 mm

Does
lens make vertical
movements?

Does
laser diode
come on?

Measure
voltage across
R701

Below 0.8V

Above 0.8V

Load the test disc

Remains

at "H" Check

Traverse motor
failure

OK

No waveform or upper
and lower amplitudes
Check
are not equal pin 25 01'0701
(FEOUT)

Upper and lower
amplitudes of
waveform are
equal

|C70i failure

n

:1 .25 V

pin iii of K3701
(/RFDET)

anges from

C
.. to "L"

Check
pin ii) of |C702
(/FLOCK)

Remains at "H"

Changes
trom "H" to "L"

Remain at 2.5V
(High impedance)

Is there

an out ut at in

Z}, 0 |C70 ?
(ECM)

Changes from
2.5V to "L
(High impedance)

lC703 failure