Technics SL-PD647

a,
i
DISPLAY
FUNCTION
OF
AUTOMATICALLY-ADJUSTED
RESULTS
(SELF-CHECK
FUNCTION)
The
unit
contains
a
function
which
displays
the
result
of
the
automatically
adjustment
of
the
servo
circuits
(tracking,
focus
servo,
etc.)
as
an
error
code
on
the
FL
display.
The
error
code
display
serves
as
a
repair
guide
showing
the
automatically
adjustment
circuit
is
at
fault.
The
procedures
for
displaying
the
error codes
are
given
below.
¢ Procedures to display the error code
(1)
Procedure
to
display
the
error
code
before
disassembly
(finished
unit)
1.
When
the
key
is
pressed
while
holding
down
the
[STOP
(Mi),
and
keys
simultaneously,
the
FL
display
illuminates,
release the
power
turns on.
When
the
FL
display
illuminates,
release
the
[STOP
(m™)],
and
keys.
Press
the
key
to
open
the
disc
tray
and
load
the
test
disc
(SZZP1054C).
Press the key to start the play operation.
After the time display appears, press the key to display the error code. (e.g. E-0)
The
error
code
display
can
be
used
as
a
repair
guide
showing
which
servo
circuit
is
at
fault.
(See Error Code Based Troubleshooting.)
OaARwN
(2) Procedure to display the error code when disassembled
Prepare the unit as described in “How to Check the Main and Servo P.C.B.” on pages 16, 17.
Press the key while holding down the [STOP (MD, and keys simultaneously.
When the FL display illuminates, release the [STOP (|, and keys.
Load the test disc (SZZP1054C) on the turntable and secure it with the clamper ass’y.
Perform steps 4 and 5 in section (1) above.
aAPons
° Error code based troubleshooting
% The unit is satisfactory if the error code is E-0 of E-2.
%
Before
testing,
check
that
the
test
disc
is
free
of
scratches
and
dirt
and
optical
pickup
is
clean.
Normal the values of
FL
error
Signal
to
check
voltage
and
waveform
code Symptom Probable cause
display
PLA
Signal ;
MDATA | 10102 ® pin
MCLK 1102 © pin
MLD 1C102 © pin
SENSE | 10102 @ pin
RST 1102 @ pin
x1
F
2 c
z =
Focus and
tracking offset
adjustments did
not complete in
the specified
time period.
4,
PLAY
0
:
mike Ae
F *16.9344 MHz F 216.9344 MHz
F
© 16.9344MH2 F*16.9344MHz
T
© Clocks X1 and X2, power supply VDD, and
reset/RST, all on 1C702
@ MDATA, MCLK, MLD, and SENSE signals
to/from the mechanism controller
Y STOP
x
T#13.6ms.
Vv Vv
d
> © <
1C102 @ pin
PLAY
2ms.0.tV/DIV.
PLAY
E | 10102 @ pin depen”
2ms.0.1V/DIV.
(C102 @ pin
KICK | 16102 @ pin
TFLOCK | 16102 O pin
/RF DET | 16102 © pin
RF TJ101
UE 3.4V
0.5
@® Scratches or contaminants on disc
surface
Disc play @® Focus and tracking servo circuits (check 1C102 @ pin 24V
unstable waveforms, voltages, and part constants.)
® Spindle driver circuit
@® Optical pickup
us 0.1 V/DIV.
| SL-PD647
‘ Normal the values of
FL error Signal to check voltage and waveform
code Symptom Probable cause eiaaal
display : Location PLAY STOP
Focus gain @® Scratches or contaminants on disc surface : fre
: ; F 10102 6 pin Hab baa 2.4V
aa
are
@®
Focus
servo
circuit
(check
waveforms,
f
fete
:
the specified voltages, and part constants.) 1C102 @ pin
© Duties! pickup ITLOCK | 1C102 @ pin
time period.
PLAY
® Tracking circuit (check waveforms,
voltages, and part constants.)
® Optical pickup
2ms.O,1V/01V,
(C102 @ pin
(C102 © pin
PLAY
1C102 @ pin| ANA?
2ms6.0.1V/DIV,
PLAY
TE 10102 @ pin a
1C102 @ pin
ITLOCK | 1C102 @ pin
E
Tracking gain ; .
suicctaent ef d @ Scratches or contaminants on disc surface 1C102 ® pin fabek| 93”
not complete in
the specified
time period.
Perform the same check as for error codes <E4, E6> and
<E8, A>.
@ NEW DIGITAL SERVO CIRCUIT
Notes:
1. There are two types A and B of new digital servo circuit.
2. Refer to “How to distinguish between A and B” shown below.
3. There are two types (MN66271 and MN662712RA) for IC102. When changing IC102, use MN662712RA.
¢ How to distinguish between types A and B.
VR101 Not mounted
R114 ERJ6GEYJ104V
R134—136 ERJ6GEYJ331V
CHIP JUMPERS
RJ101 ERJ6GEYOROOV
Not mounted ECBT1H331KB5