Nakamichi 481 Service Manual - page 30

5.5. Tape Guides Adjustment and Erase Head Stroke 

Adjustment 

Remove Head Mount Base Ass’y. Refer to Figs. 5.8 and 59. 

(1)  Supply Tape Guide Height Adjustment 

(a)  Load an EH Stroke Check Gauge M-9042/M-9051 in 

the N-481. 

(b)  Set the N-481 in play mode. 

(c)  Slide the Supply Tape Guide Check Bar down against 

the supply tape guide, thus check can be made on 

supply tape guide height. 

(d)  If the supply tape guide is misaligned, the Supply Tape 

Guide Check Bar will not come into the supply tape 

guide. If such is noted, turn to adjust the height 

adjustment nut A till the Supply Tape Guide Check Bar 

is accepted by the supply tape guide. 

(e)  If the above are insured, set the N-481 in pause mode, 

then in play mode to see whether adjustments are 

appropriately made. If not, (b) through (e) will have to 

be repeated till satisfactory results are obtained. 

(2)  Take-up Tape Guide Height Adjustment 

(a)  Load an EH Stroke Check Gauge M-9042/M-9051 in 

the N-481. 

(b)  Set the N-481 in play mode. 

(c)  Slide the Take-up Tape Guide Check Bar down against 

the take-up tape guide, thus check can be made on 

take-up tape guide height. 

(d)  If the take-up tape guide is misaligned, the Take-up 

Tape Guide Check Bar will not come into the take-up 

tape guide. If such is noted, turn to adjust the height 

adjustment nut B till the Take-up Tape Guide Check 

Bar is accepted by the take-up tape guide. 

(e)  If the above are insured, set the N-481 in pause mode, 

then in play mode to see whether adjustments are 

appropriately made. If not, (b) through (e) will have to 

be repeated till satisfactory results are obtained. 

(3)  Erase Head Stroke Adjustment 

(a)  Load an EH Stroke Check Gauge M-9042/M-9051 in 

the N-481. 

(b)  Set the N-481 in play mode, thus check can be made 

on erase head stroke through the EH Stroke Indicator. 

(c)  Check to insure whether the erase head surface is 

aligned with red line on the EH Stroke Indicator. If not, 

adjust the erase head stroke by loosening 2 screws that 

assembled erase head and erase head plate. 

(d)  After completion of adjustment, 2 pcs. of screws shall 

be locked with lock tight paint. 

Note: EH Stroke Check Gauge M-9042 (DA09042A) 

should be used for the Models from serial Nos. 

A30601001 to A30604798, and EH Stroke Check 

Gauge M-9051 (DA09051A) is for the Models 

bearing serial Nos. A30604799 and greater.