Technics SL-PD647

Mi TROUBLESHOOTING GUIDE
No CD playback
\
Does the test NO
disc rotate?
YES
Check if TOC NO
reading is performed.
Does “PLAY” appears, No access
on the display?
Below 700 mV
or no output
Check output at
pin © of 1C101
(ARF)
Playing time appear on the display
Are there outputs
at pins ©, @ and @
of 1C102?
NG At about 1 Vp-p
@® BCLK
@ LRCK OK
@ SRDATA
Are there outputs
at pins @ and @
~.of CN102?
OK
Is there en output NG
at pin @ of 1C102?
NO
t t fin abe chy t t
| 1C102 failure | | pra | | 1C102 failure
No waveform or upper and
f\ -lower amplitudes are
not equal.
of 10101.
(FE)
Optical pickup
failure
R120
47kQ
1C102
failure
failure
Check pin @
Upper and lower
amplitudes of
waveform are equal.
1C101 failure
Remove the test disc
Press the play key
Does lens make
. NO
vertical movements?
YES
Are there outputs NG
at pins @ and @ of
10103?
Does laser diode NO
come on? OK
YES Optical pickup
Measure
voltage
Below0.4V
|
failure
cross R101.
Load the series La
test disc
(1) Hold the play, stop and NG is there en output
disc
1
keys
(3
keys)
on
at
pin
:
pe
ae
and set the power :
j Switch to ON. j » Above 0.4V- | j
(2)
Press
the
play
key
and
Optical
pickup
play the test disc. failure
Remains at 1102 failure 1C103 failure
Check pin @
of 1C101.
(RFDET)
Above 0.6 V Measure voltage
between © and ©
‘ of Q101.
Changes from
“bE
or
“LL”,
Below
0.6
V
Remains at
ope
Check pin ©
of CN102.
(FLOCK)
Changes from
“H" of “L”,
10103 failure
1C102 failure 1C101 failure
| SL-PD647