Sanyo CP10 - Service Mode Operations; Setting, Operating, and Exiting Mode; Tracking Balance Adjustment

ADJUSTMENTS
1. Setting the service mode
(1)
(2)
(3)
(4)
Disconnect the AC power plug from the unit.
Press the PLAY/PAUSE key or the MEMORY key
due to discharge C904 connected to pin 18 of
1C 501 (RESET) and the +V_ IN smoothing
capacitor (C951). Consequently, pin 18 of IC 501
becomes “LOW”.
Ground the pattern of TP36 (see wiring diagram of
page 38 ~ 39) using jumper wire.
Two kind of IC is used as !C501 in this unit.
Follow step according to the particular part No,
concerned.
TMP47C420AF8172Z ...Connect the AC power
plug. (This mean is not
operation of the power
switch ON/OFF)
TMP47C420AF8173Z °° .Connect the AC power
plug while pressing the
PLAY key.
The player will be in the service mode and the LCD
displays « Og og 00”
2. Particular operation in service mode
(1)
(2)
(3)
(4)
When the SKIP/SEARCH key is pressed, the pickup
moves to the outermost or innermost portion of the
disc. This enables to check the operation of the sled
motor.
When the MEMORY key is pressed, the pickup
perform a focus search. If a disc is loaded in the
unit, the focus servo will go “ON”. If a disc is not
loaded, the focus search will take place indefinitely.
When the REPEAT key is pressed in the condition
of step 2, the tracking servo will go “ON”, and the
unit will go into a play condition.
When the STOP key is pressed at any operating
mode, you can cancel the ongoing operation.
3. Cancelling service mode
Disconnect the AC power plug. and then remove the
jumper wire from the pattern of TP36. (See the wiring
diagram of page 38 ~ 39.)
Tracking balance adjustment
Test disc ; YEDS 18 (Sony)
Measuring equipment ;
Oscilloscope
Connection point ; TP-3
Adjustment point ‘
Adjustment value ;
a
b
SVR - 101
Waveform symmetry
Put the unit in the service mode.
Load the test disc and then press the MEMORY
key.
The
disc
will
rotate
and
the
focus
servo
will
go
ON,
Note: !f the pickup is at the innermost track, first
press the PP key to move the pickup slightly
to the outside and not to play the TOC (zero
pattern) on the disc.
Observe the tracking error signal ( from TP3 ) on
the oscilloscope and adjust SVR101 so that the
waveform becomes symmetrical with respect to
0 V. (See Fig. 1.)
Focus offset adjustment
Test disc ;
YEDS 18 (Sony)
Measuring equipment ; Oscilloscope
Connection point ; TP-2 (FE-Signal) TP - 1 (RF-Signal)
Adjustment
point
;
SVR102
SVR
102
Adjustment value :
o
when unit in STOP status
Connect the oscilloscope to TP2 (FE signal).
Connect the oscilloscope to TP1 (RF signal).
Follow steps (a) and (b) of the “Tracking balance
adjustment” to turn the focus servo “ON”,
Press the REPEAT key, The tracking servo will go
ON, and the player will be in a play condition.
Measure the DC offset voltage of the waveform
[focus error signal from TP2] using a DC voltmeter,
and note the measured value.
Press the STOP key and remove the disc.
Adjust SVR102 so that the DC offset voltage at
TP2 becomes the same as the voltage measured in
step (e).
Re-load the disc, and then follow the steps (c) and
(d) to put the unit in a play condition.
(MEMORY
key
“ON”
>
REPEAT
key
“ON”.)
Confirm
that
the
‘a’
portion
of
the
waveform
(RF
signal)
from
TP1
must
be
a
straight
line,
and
the
‘b’
portion
(eye
pattern)
must
be
open.
(See
Fig.
2).
Also,
verify
that
the
height
of
the
wave
is
maximum,
OPENING EXPANDED
Ao—
Fig. 2
a
(
Voltage when unit in PLAY = Voltage