Nakamichi 481 Service Manual - page 32

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.