Sony CMT-CP100K Service Manual - Page 13

Browse online or download pdf Service Manual for Stereo System Sony CMT-CP100K. Sony CMT-CP100K 50 pages. Micro hifi component system
Also for Sony CMT-CP100K: Service Manual (2 pages)

Print Page
Sony CMT-CP100K Service Manual

ELECTRICAL ADJUSTMENTS

DECK SECTION

0 dB=0.775 V
Note: Confirm each contents of this section first of all. If the results are
not satisfied, do the adjustment.
1.
Demagnetize the record/playback head with a head
demagnetizer.
2.
Do not use a magnetized screwdriver for the adjustments.
3.
After the adjustments, apply suitable locking compound to the
parts adjust.
4.
The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5.
The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)
6.
The adjustments should be performed for both L-CH and R-
CH.
7.
Switches and controls should be set as follows unless otherwise
specified.
• Test Tape
Tape
Signal
Used for
P-4-A100
10 kHz, –10 dB
Azimuth Adjustment
WS-48B
3 kHz, 0 dB
Tape Speed Adjustment
P-4-L300
315 Hz, 0 dB
Level Adjustment
Record/Playback Head Azimuth Adjustment
Procedure:
1.
Mode: Playback
test tape
MAIN board
P-4-A100
SPEAKER terminals (SJ301)
(10 kHz, –10 dB)
L-CH, R-CH
level meter
set
+
–
SECTION 5
2.
Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
within
L-CH
1 dB
peak
Output
level
R-CH
peak
Screw
position
L-CH
R-CH
peak
peak
3.
Mode: Playback
MAIN board
SPEAKER terminals (SJ301)
test tape
P-4-A100
L-CH
oscilloscope
(10 kHz, –10 dB)
L-CH
MAIN
V
board
CN301
set
R-CH
R-CH
waveform of oscilloscope
in phase 45 °
90 ° 135 ° 180 °
good
wrong
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

CD SECTION

Note:
1.
CD Block is basically constructed to operate without
adjustment.
2.
Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10 MΩ impedance.
4.
Clean the object lens by an applicator with neutral detergent
within
when the signal level is low than specified value with the
1 dB
following checks.
5.
Check the focus bias check when optical block is replaced.
Focus Bias Check
Screw
position
BD board
TP (RF)
TP (VC)
Procedure :
1.
Connect oscilloscope to TP (RF) and TP (VC) on the CD board.
H
2.
Press the
I/1
button to turn the power on, and press the
(CD) button to open the CD disc tray.
3.
Put disc (YEDS-18) in and press the
back.
4.
Confirm that oscilloscope waveform is as shown in the figure
below. (eye pattern)
A good eye pattern means that the diamond shape ( ) in the
center of the waveform can be clearly distinguished.
13
13
Checking Location:
– CD BOARD (Conductor Side) –
oscilloscope
(DC range)
+
IC103
–
TP (RF)
Z
TP (VC)
u
(CD) button to play-
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level:
1.2 ± 0.1 Vp-p
HCD-CP100/CP100K