17
CX-LFA660/LFA770
SECTION 6
ELECTRICAL ADJUSTMENTS
[Record/Playback Head Azimuth Adjustment]
Procedure:
1. Mode : Playback
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1 dB of peak.
test tape
P-4-A100
(10kHz, –10dB)
MAIN board
J201
speaker terminal
level meter
set
+
–
L-CH
peak
R-CH
peak
screw
position
within 1dB
DECK SECTION 0 dB=0.775V
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to
the parts adjusted.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in
this service manual. (As a general rule, playback circuit
adjustment should be completed before performing recording
circuit adjustment.)
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switches and controls should be set as follows unless otherwise
specified.
4. After the adjustments, apply suitable locking compound to
the parts adjusted.
Adjustment Location: Record/Playback/Erase Head
[Tape Speed Check]
Procedure:
1. Turn the power on.
2. Insert the WS-48B into deck.
3. Press the TAPE
nN
button of deck.
4. Check the reading of frequency counter becomes 3000
±
90
Hz.
Sample Value of Wow and flutter
W.RMS (JIS) less than 0.3%
(test tape: WS-48B)
3. Mode: Playback
test tape
P-4-A100
(10kHz, –10dB)
oscilloscope
set
Waveform of oscilloscope
in phase
45
°
90
°
135
°
180
°
good
wrong
MAIN board
J201
speaker terminal
L
R
Signal
Used for
Tape
P-4-A100
WS-48B
10 kHz, –10 dB
3 kHz, 0 dB
Azimuth Adjustment
Tape Speed Adjustment
adjustment screw
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