Technics SL-PD665

SL-PD687
AUTOMATIC
ADJUSTMENT
RESULTS
DISPLAY
FUNCTION
DIGITAL
SERVO
SYSTEM
(SELF-CHECK
FUNCTION)
The
unit contains
a
functic
hich
displays
the
result
of
the automatically
adjustment
of the servo
circuits
(tracking,
focus
‘servo,
etc)
a
sean
error
tode
‘on
the
FL
display.
i
=
i
Adjustment
VR
has
been
deleted.
‘MN66271RA
(Super
1
chip
IC)
The
error code display
serves as
a
repair
guide showing
the automatically
adjustment
circuit Is at
fault,
The
be
tel
ean
o
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 (a) and keys
simultaneously, the FL display illuminates, release the power turns on.
2. When the FL display illuminates, release the (STOP (i), and keys.
3. Press the [OPEN/CLOSE (A)] key to open the disc tray and load the test disc (SZZP1054C).
4. Press th key to start the play operation.
5. After the time display appears, press the [STOP (M)] key to display the error code. (e.g. E-0)
6. The error code display can be used as a repair guide showing which servo circult is at fault.
(See Error Code Based Troubleshooting.)
(2) Procedure to display the error code when disassembled
1. Prepare the unit as described in “How to Check ." on pages 19, 20.
2. Press the [POWER] key while hoiding down ine (sory and [DISC 1] keys simultaneously.
3. When the FL display illuminates, release the (STO> (m) ind [DISC 7] keys.
4, Load the test disc (SZZP1054C) on the turntable and secure the clamper ass'y.
5. Perform steps 4 and 5 in section (1) above.
* Error code based troubleshooting
3K The unit is satisfactory if the error code is E-0 of E-2.
3X Before testing, check that the test disc is free of scratches and dirt and of
RF signal =>}
ind Servo.
‘Traverse coil
I pickup Is clean.
FL enor Signal to check Normal vokage and
code
|
Symptom
Probable
cause
7
aopiny
Signa
[Location
uy
Sror.
The
following
flow
chart
shows
the
sequence
of
automatic
adjustments,
Moata | 10702 @ pin 4av Flow chart automatic adjustment sequence
MCLK | 1C702 © pin inant
Focus and | clocks x1 and x2, power supply [mio 16702 @ pin] _—‘ii=" | 48¥ T (sum)
a DD, and reset/AST, all on 16702 [Sense | 10702 @ pin OV ov
€1 | adlustments not | @ paTa, MCLK, MLO, and SENSE
completed in signal: “te trom. mechanism RST 1C702 @ pin 43V 4.9V.
‘the specified tones tol aw
time
period.
Sentrolier
x1
|
16702
@
pin
AMS
AM
Focus
search
operation:
ON
x2 | 10702 @ pin AW AWs" f ©
ae = Focus offset adjustment Focus servo operation: ON
FE | 10702 pin 2av uUu————_ ‘Tracking servo operation: OFF
te | 10702 @ pin 2a Focus offset adjustment
eS
®
Scratches
or
contaminants
on
adj
ES
disc
surface
FOO
|
1C702
@
pin
2av
‘Temporary
adjustment
of
tracking
gain
e7 @ Focus and tracking servo circuits
9
{Disc
play
TRO_|
1G702
@
pin
24V
‘Approk.
2500
ES
|
unstable
ore
easy
me
voaaes:
and
arcK
|
16702
@
pin
24V
Focus
offset
adjustment
£0 ® Spindle driver circuit TFLOGK | 16702 © pin ov 4av
EF ® Optical pickup IRF OET | iC702 @ pin ov 48V
RF ‘Ts701 a ie 34V No|
STAT | 16702 © pin ‘35V ov
FRAL | 10702 @ pin 2521.25V 2.5+1.25V
Best Eye (PD @® Scratches or contaminants on re tt eaven
£4
|
Balance)
disc
surface
RF
tarot
|
Bl
Sat
Focus
balance
adjustment
&6 adjustment not | @® Focus and Tracking servo circuit
eC completed in (check waveforms, voltages, and FE 1C702 ® pin ov
RE: the specified part values.)
time
period.
®
Optical
pickup
ITLOCK
|
1C702
@
pin
ov
Fine
adjustment
of
focus
gain
OFT | 16702 @ pin ov * Because the microcomputer precisely performs
Focus
or
@
Scratches
or
contaminants
on
FE
|
1C702@pin
2av
adie
orp
=
shew
“
Ate:
fom:
Tracking
gain
disc
surface
t
sappron,
3.
Sevan
s
gs:
Fine
adjustment
tracking
gain
8
|
adjustment
not
|
@
Focus
and
Tracking
servo
circuit
as
rs
reading
TOC
data
if
a
used
disc
is
eccentric
one
EA
compieted
in
(check
waveforms,
voltages,
and
ae.
(0702
@
pin
.
or
its
surface
is
warped.
the
specitied
part
values.)
FTLOCK
|
16702
B
pin
ov
4
(a0)
time period. | @ Optical pickup OF [emo pn ov
—