Sony HCD-CL5MD Service Manual page 31

3. Mode: Playback
test tape
P-4-A100
(10kHz, –10dB)
set
Pin 3 (R-ch)
Waveform of oscilloscope
in phase 45°
good
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location: Record/Playback/Erase Head
Tape Speed Check
Note: Set the test mode using the following method and begin tape
speed adjustment.
Procedure:
With the power turned ON, press the x button, ENTER/YES
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.
2. Press the Y button of deck.
3. Check the reading of frequency counter becomes 3000 ± 15 Hz.
Sample Value of Wow and flutter
W.RMS (JIS) less than 0.3%
(test tape: WS-48B)
main board
CN301
Pin 1 (L-ch)
oscilloscope
Pin 2 (GND)
L
R
90° 135° 180°
wrong
Record Bias Adjustment
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjust-
ment, 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 ad-
justment. During recording, the input signal FUNCTION will auto-
matically switch to VIDEO.
(After recording, press the m button without stopping will re-
turn to the position where recording was started.)
1. Press FUNCTION button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck, press the TAPE REC PAUSE/START
button, and then press the Y button to start recording.
3. Mode: Record
VIDEO (AUDIO) IN
1) 315 Hz
2) 10 kHz
AF OSC
600 Ω
attenuator
4. Mode: Playback
recorded
position
set
5. Confirm playback the signal recorded in step 2 become adjust-
ment level as follows.
If these levels do not adjustment level, adjust the RV304 (L-CH)
and RV354 (R-CH) on the TC board to repeat steps 3 and 4.
Adjustment level: The playback output of 10 kHz level difference
against 315 Hz reference should be 0 ± 0.5 dB.
Adjustment Location:
[TC BOARD]
HCD-CL5MD
} 50 mV (–23.8 dB)
blank tape
CS-123
set
level meter
main board
CN301
Pin 3 (R-ch)
Pin 1 (L-ch)
RV354
RV304
RV304(Lch),RV354(Rch)
Record Bias
31