Nakamichi 481, Руководство по обслуживанию

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5.7. Playback Head and Record Head Height
Adjustment and Azimuth Alignment
Refer to Fig. 5.12.
(1) Playback Head Height Adjustment and Azimuth
Alignment
(a) Connect a VTVM to the Output Jacks.
(b) Load a 1 kHz Track Alignment Tape (DA09007A), then
set the N-481 in play mode.
(c) Turn the PH Height Gear until the output of both
channels becomes minimum.
(d) Load a 15 kHz Azimuth Tape (DA09004A), then set the
N-481 in play mode.
(e) Turn the PH Azimuth Alignment Screw until the output
of both channels becomes maximum.
(f) Repeat (b) through (e) 1 — 2 times.
(2) Record Head Height Adjustment and Azimuth
Alignment
(a) Connect a VTVM to the Output Jacks.
(b) Load a Reference SX Tape (DA09025A). Set the Eq.
and Tape Switches of the N-481 to 70 ps and SX
positions, then set the N-481 in record and play mode.
(c) Feed in 400 Hz (0 dB), then turn the RH Height Gear
until the output of both channels becomes maximum.
(d) Feed in 15 kHz (-20 dB), then turn the RH Azimuth
Alignment Screw until the output of both channels
becomes maximum.
(e) Repeat (c) and (d) 1 — 2 times.
(f) After completion of both adjustment and alignment,
feed in 400 Hz (0 dB) and record it to the same portion
of both A and B sides of the tape.
(g) Immerse the recorded tape in a magnetized develop
ing solution. In turn, check to insure that the recording
head tracks across the center are separated with a
distance of 0.55 to 0.75 mm (typically 0.65 mm) as
illustrated in Fig. 5.13.
Note: Liquid for tape magnetized development solution
“MAGNA-SEE, SOUND CRAFT a product of
CBS RECORDS a division of Columbia Broad
casting System, Inc., Danbury, Conn. 06810
U.S.A., or equivalent”.
After development, clean the tape otherwise
pressure rollers and heads will become dirty.