Sony HCD-VZ50MD Service Manual page 34

3. Mode: Playback
test tape
P-4-A100
(10kHz, –10dB)
set
Waveform of oscilloscope
in phase 45°
good
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location: Playback Head (Deck A)
Record/Playback/Erase Head (Deck B)
Reverse
Tape Speed Adjustment (Deck A)
Note: Set the test mode using the following method and begin tape
speed adjustment.
In the test mode, the speed will switch to double speed or
normal speed each time the HIGH-SPEED CD-MD SYNC but-
ton is pressed.
Procedure:
With the power turned ON, press the x button, DISPLAY button,
and DISC 3 button simultaneously.
(The "VOLUME" on the fluorescent display tube will blink while
in the test mode.)
To exit the test mode, press the "/1 button.
1. Insert the WS-48B into deck B.
2. Press the H button of deck B.
3. Press the HIGH-SPEED CD-MD SYNC button and play the tape at
double speed.
4. Adjust RV1001 of the LEAF SW board so that the reading of
the frequency counter becomes 6000 ± 180 Hz.
5. Press the HIGH-SPEED CD-MD SYNC button and play the tape at
34
main board
CN302
Pin 1 (L-ch)
oscilloscope
Pin 2 (GND)
L
R
Pin 3 (R-ch)
90° 135° 180°
wrong
Foward
normal speed.
6. Adjust RV1002 of the LEAF SW board so that the reading of
the frequency counter becomes 3000 ± 90 Hz.
7. Press the "/1 button, after the turned ON.
8. Insert the WS-48B into deck A, and insert the normal tape into
deck B.
9. Press the SYNC REC button and display "TAPE A t B HIGH-
SPEED" and then press the REC button to start recording.
10.Press the x button.
11.Press the H button of deck B and check the reading of fre-
quency counter becomes 3000 ± 90 Hz.
Adjustment Location: LEAF SW board
Sample Value of Wow and flutter
W.RMS (JIS) less than 0.3%
(test tape: WS-48B)
Playback Level Adjustment (Deck A, Deck B)
Procedure:
Mode: Playback
Deck A is RV311 (L-CH) and RV411 (R-CH), deck B is RV301
(L-CH) and RV401 (R-CH)
so that adjustment within the following adjustment level.
Adjustment level:
CN302 playback level: 301.5 to 338.3 mV (–8.2 to –7.2 dB)
level difference between the channels: within ± 0.5 dB
Adjustment Location: AUDIO board
test tape
P-4-L300
(315Hz, 0dB)
set
Adjustment Location
[LEAF SW BOARD]
RV1001(High Speed)
RV1002(Normal Speed)
RV1002 RV1001
level meter
main board
CN302
Pin 1 (L-ch)
Pin 3 (R-ch)