HCD-CPX22/NXM3
2. Turn the adjustment screw and check output peaks. If the peaksCD SECTION
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
Note:
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
within3. Use an oscilloscope with more than 10MW impedance.
L-CH1dB
4. Clean the object lens by an applicator with neutral detergent
peak
withinwhen the signal level is low than specified value with the
Output1dB
levelfollowing checks.
S-curve Check
R-CHConnection:
peak
ScrewScrew
positionL-CHR-CHpositionoscilloscope
peakpeakCD board
3. Mode: PlaybackTPO102 (FE1)+
TP117 (VC)�
test tape
P-4-A100
(10 kHz, �10 dB)oscilloscopeProcedure:
pin 11. Connect an oscilloscope to test point TPO102 (FE1) and TP
L-CH
pin 2117(VC) on the CD board.
MAIN
L2. Turn the power on.
boardVH
CN3013. Put the disc (YEDS-18) in and turned power switch on again
R
setand actuate the focus search. (actuate the focus search when
disc table is moving in and out)
R-CH
4. Check the oscilloscope waveform (S-curve) is symmetrical
pin 3
between A and B. And confirm peak to peak level within 2.4
? 1 Vp-p.
waveform of oscilloscope
S-curve waveform
in phase 45° 90° 135° 180°symmetry
goodwrong
A
4. After the adjustments, apply suitable locking compound to
within 2.4 ? 1 Vp-p
the pats adjusted.
B
Adjustment Location: Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).Note:
YTry to measure several times to make sure than the ratio
of A : B or B : A is more than 10 : 7.
YTake sweep time as long as possible and light up the
brightness to obtain best waveform.
Checking Location: CD board (SIDE B)
(See page 20.)
reverseforward
18 |
ACEC
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