Sony SS-CT270, Руководство по обслуживанию

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19
HCD-DP1000D
REC Bias Adjustment
DECK B
Procedure:
INTRODUCTION
When set to the test mode performed in
Tape Speed Adjustment
,
when the tape is rewound after recording, the “REC memory mode”
which rewinds only the recorded portion and playback is set.
This “REC memory mode” is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to VIDEO.
(If do not operation of stopped from recording complete, and rotette
of shuttle knob then rewind to recording start position.)
1. Press MD (VIDEO) button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B.
3. After press REC PAUSE/START button, press REC PAUSE/
START button, then recording start.
4. Mode: Record
5. Mode: Playback
6. Confirm playback the signal recorded in step 3 become
adjustable level as follows.
If these levels do not adjustable level, adjustment the RV304
(L-CH) and RV354 (R-CH) on the AUDIO board to repeat steps
4 and 5.
Adjustable level: Playback output of 315 Hz to playback output
of 10 kHz: 0
±
0.5 dB
Adjustment Location: MAIN board
REC Level Adjustment
DECK B
Procedure:
INTRODUCTION
When set to the test mode performed in
Tape Speed Adjustment ,
when the tape is rewound after recording, the “REC memory mode”
which rewinds only the recorded portion and playback is set.
This “REC memory mode” is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to VIDEO.
(If do not operation of stopped from recording complete, and rotate
of shuttle knob then rewind to recording start position.)
1. Press MD (VIDEO) button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B.
3. After press REC PAUSE/START button, press REC PAUSE/
START button, then recording start.
attenuator
set
MD/VIDEO (AUDIO) IN
1) 315 Hz
2) 10 kHz
50 mV (–23.8 dB)



600
Ω
blank tape
CN-123
AF OSC
+
–
set
recorded
portion
CN301 (Pin
3
: L-CH)
(Pin
1
: R-CH)
level meter
Tape Speed Adjustment
DECK B
Note: Start the Tape Speed adjustment as below after setting to the test
mode.
In the test mode, the tape speed is high during pressing the
CD SYNC HI-DUB
button.
Procedure:
1. Turn the power switch on.
2. Press the
x button, DISPLAY button and DISC 3 button
simultaneously.
(Cursor segment flash on the FL display tube.)
To exit from the test mode, press the
?
/
1
button.
Mode: Playback
1. Insert the WS-48B into the deck B.
2. Press the
Y button on the deck B.
3. Press the CD SYNC HI-DUB button in playback mode.
Then at HIGH speed mode.
4. Adjust RV1001 on the LEAF SW board do that frequency
counter reads 6,000
±
180 Hz.
5. Press the CD SYNC HI-DUB button.
Then back to NORMAL speed mode.
6. Adjust RV1002 on the LEAF SW board so that frequency
counter reads 3,000
±
90 Hz.
Adjustment Location: LEAF SW board
Playback level Adjustment
DECK A DECK B
Procedure:
Mode: Playback
Deck A is RV302 (L-CH), Deck B is RV303 (L-CH) so that
adjustment within adjustment level as follows.
Adjustment Level:
CN301 PB level: 334 to 375 mV (–6.8 dB
±
0.5 dB) level
difference between the channels: within
±
0.5 dB
Adjustment Location: MAIN board
Sample Volue of Wow and Flutter: 0.3% or less W. RMS
(WS-48B)
+
–
set
test tape
WS-48B
(3 kHz, 0 dB)
main board
CN301 (Pin
3
: L-CH)
(Pin
1
: R-CH)
frequency counter
+
–
set
test tape
P-4-L300
(315 Hz, 0 dB)
main board
CN301 (Pin
3
: L-CH)
(Pin
1
: R-CH)
level meter