Denon DN-730R DN--730R, Adjustingmechanism Andsectionchecking The, ReplacincTthe Pinch Roller

DN--730R

ADJUSTINGMECHANISM ANDSECTIONCHECKING THE

1.ReplacincTthe Pinch Roller (36)

Before replacincl" tl_e pinch roller, clean the tape contact surface o[ the pinch roller and the capstan shaft.

Most causes of poor tape transport can be traced to dirty pinch roller and capstan shaft.

Remove the clips that press the pinch roller and pull the pinch

roller forward to remove it.

After replacing, run a padless C-90 tape to check for tape curls at the tape guide section of the head.

2.Checking the Pressure Force of the Pinch Roller (36).

In the playback mo_d.e_hpok a. spring weight opto the bracket at

the center o; the pinch roller. After separating the pinch roller from the capsta'q s_'aft, allow fl_e pinch roller to contact the caps- t_n shaft again. Check to make sure the spring weight reads be-

twveen 250-- 350 g when the pinch roller starts to rotate

Replace the pinch roller (36) when it does not conform to the

slandard specification values.

Capstan shaft

Pinch roller

li

:i

_._ 250 -- 350 g

, Replacing the Record/Playback Head (14)

(1)How to remove _e RiP HEAD.

1)Remove securing screw (1) and azimuth adjusting

screw (1) from the record/playback head

2)Remove the soldered head wire and disassemble the

mech_,nical unit to remove the record:playback head.

(2)How to assemble the R,,P HEAD.

Reverse the above 1 procedures for removrng the R,"P

HEAD

" Solder the HEAD WIRE according to the diagram

mechanism (re('ordingiplayback head)

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4.Replacing the ERASE HI'AD (15)

(1)Unscrew the erase head holding screws (53).

(2)By unsoldering the HEAD W RES can be taken off the

mechanism unit.

(3)When the replacement is completed, secure the screws with the screw lock

____F--ZZ_-:±-J

5.Checking the Take-upTorque

Load

the

cassette

type

torque meter

',SONY

TW21:11

).

Check

to

make

sure

that

the

aver3ge

torque

meter reading is

within

30-70

g-cm

during

playback.

If it is not within

thi,_; range.

check

the

voltage

(approx.

4V)

of

th_

reel

motor.

If the

voltage is

low,

the torque

will

be

weak:

if

it is

high,

the

torque

will

be strong

6.Checking the FFand RE\_/ Torques

Load the cassette type torque meier (SONY TW2231). Check to

make sure the torque meter indicates within 90--180 g-cm at the end of FF and REW.

7.Checking the Back Tension Torque During Record/Playback

Load	the	cassette		type	torque		meter	(SONY	TW2i11):	check
to make		sure	the	torque	meter		read_	between	2 --6 g-cm	during
playback		and	that	there	is	no unevenness
If it is	not	within	this range,			replace the		reel ass'y (5) or Washer.

8.Checking the FF and REW Times

Load a C-60 cassette tape (DENOI'4 GR-2/60); check to make sure the tape is fast forwarded o: rewound within 110 sec- onds. if it is not within this range, rheck sections 5 and 6.

9.Checking the Existence of a Cassette Housing and the Operation of the Erase

Prevention, Metal and Chrome Switch

Confirm that the sensor arm properl !, detecting the tape type de-

tection holes on the cassette housin(.;

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