Nakamichi 481 Service Manual - page 33

5.8. Record Head Stroke Adjustment 

Refer to Figs 5.14 and 5.15. 

Note:  This adjustment will be required only to insure 

freedom from misalignment of the record head 

stroke in the record head stroke check mode. 

(1)  Check the accuracy of the record head stroke. 

(2)  Remove Head Mount Base Ass’y referring to item 

3.22. 

(3)  Remove the record head assembly. 

(4)  Adjustment of Record Head Mounting Gauge M-9048 

(DA09048A) 

(a)  Mount the Block B onto the Mounting Gauge Plate. 

(b) Loosen the 2 screws fixing the Block A. 

(c) As shown in the Fig. 5.14, hold the Gauges (3.05 

mm and 0.1 mm thickness) between the Block A 

and Block B, fix the Block A with screws, pushing 

the Block A to the 2 guide pins. 

(5)  Remove the Block B from the Mounting Gauge Plate. 

(6)  As shown in the Fig. 5.15, mount the R-8L record head 

assembly onto the Mounting Gauge Plate, then check 

the location of the R-8L record head surface. (If record 

head contacts to the Block C, loosen 2 pcs. of screws 

that assembled record head and R-8L record head 

assembly, then place the R-8L record head assembly 

onto the Plate.) 

(7)  Remove the R-8L record head assembly from the 

Mounting Gauge Plate. 

(8)  Readjustment of Record Head Mounting Gauge 

M-9048 (DA09048A) 

(a)  Mount the Block B onto the Mounting Gauge Plate. 

(b)  Loosen the 2 screws fixing the Block A. 

(c)  As shown in the Fig. 5.14, hold the Gauges (3.05 

mm and either one of 0.05, 0.15, 0.2, 0.25, 0.3 or 

0.35 mm thickness) between the Block A and 

Block B, fix the Block A with screw, pushing the 

Block A to the 2 guide pins. 

(9)  Remove the Block B from the Mounting Gauge Plate. 

(10) Mount the R-8L record head assembly onto the 

Mounting Gauge Plate. 

(11)  As shown in the Fig. 5.15, loosen the R-8L record 

head with 2 pcs. of screws onto the record head plate. 

As the location of the Block A is secured by the item 

(8) - (c), push the record head to the directions A and 

B, then tighten 2 pcs. of screws. 

(12)  Check to insure freedom from gap between the Block C 

and record head surface, then tighten the 2 pcs. of 

screws on the record head plate with lock tight paint. 

(13)  Assemble the record head assembly to the head mount 

base assembly. 

(14) Assemble the head mount base assembly to the 

mechanism assembly. 

(15)  Check the record head stroke. 

If the above are inaccurate, items (1) through (15) will 

have to be repeated till satisfactory results are obtained.