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Record/Playback/Erase Head Azimuth Adjustment
Procedure :
1. Mode : FWD playback
test tape
P-4-A100
(10kHz, –10dB)
set
2. Turn the adjustment screw for the maximum output levels. If
these levels do not match, turn the adjustment screw until both
of output levels match together within 1dB.
L-CH
peak
within
output
1 dB
level
R-CH
peak
Screw
position
3. Phase Check
Mode : FWD playback
test tape
P-4-A100
(10kHz, –10dB)
L-CH
set
R-CH
45 °
in phase
good
4. Change the reverse playback mode and repeat the step 1 to 3.
5. After the adjustment, lock the adjustment screw with suitable
locking compound.
Adjustment Location :
– record/playback head –
FWD side REV side
adjustment screw
level meter
47k Ω
LINE OUT
within
1 dB
screw position
L-CH
R-CH
peak
peak
Osilloscope
47k Ω
V
H
47k Ω
LINE OUT
screen pattern
90 °
180 °
135 °
wrong
Tape Speed Adjustment
Procedure :
– FWD Playback Mode –
test tape
WS-48B
(3kHz, 0dB)
1. Set to FWD playback mode.
2. Adjust RV691 so that the frequency counter reading becomes
3,000Hz.
Standar d v alue : 2,970 to 3,030Hz
3. Set to REV playback mode.
Confirm the frequency should be within the standard value.
4. Confirm the frequency difference between beginning and the
end of tape should be within 1.5% (45Hz).
Adjustment Location : TC RF board
TC RF board
– 15 –
frequency counter
47k Ω
set
LINE OUT
Mechanism deck
RV691 :
Tape speed adjustment
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