HCD-CP100/CP100K
SECTION 5
ELECTRICAL ADJUSTMENTS
2. Turn the adjustment screw and check output peaks. If the peaks
DECK SECTION0 dB=0.775 VCD SECTIONChecking Location:
do not match for L-CH and R-CH, turn the adjustment screw
Note:Confirm each contents of this section first of all. If the results areso that outputs match within 1dB of peak.
Note:� CD BOARD (Conductor Side) �
not satisfied, do the adjustment.
1. CD Block is basically constructed to operate without
1. Demagnetize the record/playback head with a head
adjustment.
demagnetizer.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
2. Do not use a magnetized screwdriver for the adjustments.
within
3. Use an oscilloscope with more than 10 M& impedance.
3. After the adjustments, apply suitable locking compound to theL-CH1 dB
peak4. Clean the object lens by an applicator with neutral detergent
parts adjust.within
Outputwhen the signal level is low than specified value with the
4. The adjustments should be performed with the rated power1 dB
levelfollowing checks.
supply voltage unless otherwise noted.
5. Check the focus bias check when optical block is replaced.
5. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustmentR-CH
Focus Bias Check
should be completed before performing recording circuitpeak
ScrewScrew
adjustment.)positionL-CHR-CHposition
6. The adjustments should be performed for both L-CH and R-peakpeakoscilloscope
CH.(DC range)
7. Switches and controls should be set as follows unless otherwise3. Mode: PlaybackBD board
specified.MAIN board
test tapeSPEAKER terminals (SJ301)TP (RF)IC103+
P-4-A100L-CHTP (VC)�
Y Test Tapeoscilloscope
(10 kHz, �10 dB)
TP (RF)
TapeSignalUsed forL-CH
Procedure :
P-4-A10010 kHz, �10 dBAzimuth Adjustment1. Connect oscilloscope to TP (RF) and TP (VC) on the CD board.
MAIN
VH
WS-48B3 kHz, 0 dBTape Speed Adjustmentboard2. Press theI/1 button to turn the power on, and prZess theTP (VC)
CN301
P-4-L300315 Hz, 0 dBLevel Adjustment(CD) button to open the CD disc tray.
set
3. Put disc (YEDS-18) in and press theu (CD) button to play-
R-CHback.
R-CH4. Confirm that oscilloscope waveform is as shown in the figure
Record/Playback Head Azimuth Adjustment
below. (eye pattern)
Procedure:
waveform of oscilloscope
A good eye pattern means that the diamond shas ) in the pe (
1. Mode: Playback
center of the waveform can be clearly distinguished.
test tapeMAIN board
P-4-A100SPEAKER terminals (SJ301)in phase45° 90° 135° 180°VOLT/DIV: 200 mV
(10 kHz, �10 dB) L-CH, R-CHTIME/DIV: 500 ns
goodwrong
level meter
setlevel:
+1.2 ? 0.1 Vp-p
4. Repeat step 1 to 3 in playback (REV) mode.
�
5. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location:
reverse
forward
1313 |
ACEC
