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Adjustment of CD player
INPUT
OUTPUT
No.
ITEM
SETTING
SETTING
TEST MODE : While pressing the [DISC 3 PLAY] key, plug the AC power cord into the AC outlet.
Set the senor section of
LASER
–
1
the optical power meter
POWER
on the pickup lens.
Connect an oscilloscope
FOCUS
Test disc
as follows.
2
ERROR
Type 4
(+)side : RF(CN1-1)
BIAS
GND : VC (CN1, 4)
Note:
Type 4disc :SONY YEDS-18 Test Disc or equivalent.
LPF : Around 47k + 390pF or so.
(a) Laser Power
0.05~0.15 mW
Pickup
Optical power meter
The MD Adjustment is listed on page 8 through p10.
PLAYER
ALIGNMENT
ALIGN FOR
SETTING
POINT
On the power
from.0.05 to
Press the "PLAY"
0.15mw. when the
key to check that the
diffraction grating is
–
display is "03".
correctly aligned
with the RF level of
0.8Vp-p or more
Press the "PLAY"
key. Confirm that
VR1
Optimum eye pattern
the display is "05".
(b)
RF signal : AC coupled
RF signal in test mode (PLAY).
Perform the tangential and focusing offset are focused
into one point on the display. The crossing points above
and below the center shall also be looked clearly.
INPUT
NO.
ITEM
FIG.
SETTING
Unless otherwise specified, set the respective switches as follows:
TAPE : NORMAL
DOLBY : OFF
I Cassette mechanism unit (Adjustment of the REC / PLAY head)
Demagnetization
(a)
(1)
—
and cleaning
SCC-1727
Azimuth of the
TCC-153
(2)
REC / PLAY
MTT-114
head
10kHz, -10dB
(b)
II PC board adjustment.
(A)
Adjust the AG for the
BIAS
output of the DECK to
(1)
CURRENT
become 12.5KHz –20dBs.
400Hz / 12.5kHz
(AC-224)
X09 CN3
TEST PIN
1
PLAY (L)
2
GND
3
PLAY (R)
AC voltmeter
Oscilloscope
Frequency counter
(B)
OUTPUT
CASSETTE TAPE
ALIGNMENT
ALIGN FOR
SETTING
DECK SETTING
POINTS
Demagnetize the REC / PLAY head
Recording
Power : OFF
with the head eraser. Clean the REC/
head, erase
—
Demagnetization,
PLAY head, erase head, capstan and
head, capstan
cleaning, PLAY
pinch roller using a cotton swab slightly
pinch roller
damped with alcohol.
Adjust the output to maximum and
adjust the azimuth adjustment screw
(B)
PLAY
for the Lissajours waveform pattern of
the oscilloscope to become close to a
RVS
FWD
45˚ straight ling.
Record 400Hz and 12.5kHz alternately,
VR3(L)
and adjust the bias current adjustment
(B)
REC PLAY
VR4(R)
potentiometer for the playback levels to
become the same.
AC voltmeter
AG
(A)
FIG.
0dBs = 0.775V
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