Sony AIWA XR-MN5 Service Manual page 25

3. Mode: Playback
MAIN board
SPEAKER terminal (J201)
test tape
L-CH
P-4-A100
(10 kHz, – 10 dB)
L-CH
set
R-CH
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
adjustment screw
Note: Refer to "3-6. Cassette Panel" (see page 9)
Tape Speed Check
Mode: Playback
test tape
WS-48B
(3 kHz, 0 dB)
set
MAIN board
SPEAKER terminal (J201)
L-CH, R-CH
1. Insert the WS-48B into the deck.
2. Press the N button on the deck.
3. Confirm that the frequency counter reads 3,000 ± 90 Hz.
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)
oscilloscope
V H
90 ° 135 ° 180 °
wrong
frequency counter
+
–
(WS-48B)
Record Bias Adjustment
Procedure:
1. Record mode
MAIN board
AUX IN (J602)

1) 315 Hz

50 mV (–23.8 dB)
2) 10 kHz

AF OSC
600 Ω
attenuator
2. Mode: Playback
i-Bass OFF
BASS 0
TREBLE 0
recorded
portion
set
MAIN board speaker terminal (J201)
3. Confirm playback the signal recorded in step 1 become
adjustment level as follows.
4. If these levels do not adjustment level, adjustment the SFR451
(L-CH) and SFR452 (R-CH) to repeat steps 1 and 4.
Adjustment level: Playback output of 315 Hz to playback output
of 10 kHz: 0 ± 1.0 dB (0 ± 4.5mV).
Adjustment Location: MAIN board
[MAIN BOARD] – Component Side –
IC901
IC601
SFR451
Record Bias
Adjustment(L-CH)
CX-LMN5
blank tape
CN-123
set
level meter
+
–
SFR452
Record Bias
Adjustment(R-CH)
23