Read Sony CX-LDB30 / CX-LDB50 / XR-DB30 / XR-DB50 Service Manual online
21
CX-LDB30/LDB50
4. After the adjustments, apply suitable locking compound to
the parts adjusted.
Adjustment Location: Record/Playback/Erase Head
3. Mode: Playback
set
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
R-CH
oscilloscope
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
MAIN board
SPEAKER terminal (J201)
L-CH
SPEAKER terminal (J201)
L-CH
Tape Speed Check
Mode: Playback
Note: Refer to “3-9. Cassette Panel” (see page 11)
adjustment screw
1. Insert the WS-48B into deck.
2. Press the TAPE N button of deck.
3. Confirm that the frequency counter reads 3000
2. Press the TAPE N button of deck.
3. Confirm that the frequency counter reads 3000
± 90 Hz.
Sample Value of Wow and flutter: 0.3% or less W.RMS (JIS)
(WS-48B)
+
–
–
set
test tape
WS-48B
(3 kHz, 0 dB)
WS-48B
(3 kHz, 0 dB)
MAIN board
SPEAKER terminal (J201)
L-CH, R-CH
SPEAKER terminal (J201)
L-CH, R-CH
frequency counter
Record Bias Adjustment
Procedure:
1. Record mode
2. Mode: Playback
i-Bass OFF
BASS 0
TREBLE 0
BASS 0
TREBLE 0
3. Confirm playback the signal recorded in step 1 become
adjustment level as follows.
Adjustment level: Playback output of 315 Hz to playback output
of 10 kHz: 0
± 1.0 dB (0 ± 4.5mV).
attenuator
set
MAIN board
AUX IN (J291)
AUX IN (J291)
1) 315 Hz
2) 10 kHz
2) 10 kHz
50 mV (–23.8 dB)
600
Ω
blank tape
CN-123
CN-123
AF OSC
+
–
–
set
recorded
portion
portion
MAIN board speaker terminal (J201)
level meter
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