Transport Mechanism; Driving Of Capstan; Driving Of Pinch Roller; Recording And Play Back - Akai 1700 Service Manual

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TRANSPORT MECHANISM
Driving of Capstan
Fjgure l.
{Aj Motor
(B) Driving Belt (flat belt)
(C) Capstan
(D) FlYwheel
High-speed rotation of Mot / (A) is reduced by D/trire'
Br, (B) and transmitted to Capstan (C), which is connected
to Flywheel with ample inertia and €nables rated rotaiion
by absorbing mino. rotation distortion ofDotor itself.
C a p s t a n R o t a t i o n 6 0 6 r . p . m . a t 7 - % ' ( l 9 c n ) p e . s e c .
303r.p.m. at 3-%'(9.5 cm) per sec.
l5l.5r.p.m, at l -16' (4.7s cmlper sec.
Motor Rotation 2,900 to 1,450 r.p.m. at 50 cps.
3,480 to 1,74{r.p.m. at 60cps.
Fig. I
Driving of Pinch Roller
Put tape between rotating capstan and pinch roller and
push pinch rouer against capstan, this will transport thc
tape at rat€d spe€d. Th€ appropriate pressure of pinch
roller is between I,000 to I,150 grams at the tape sp€ed
of 7-%' (19cm) per s€cond.
R€coding and Play Back
TuJ[ rhe RECORD, PLA rB,4Cf knob (A) to "PLAY"
position, and pinch roller presses against capstan to move
tape at the rated sp€ed. At the same time, Idlel (B) moves
between Motor &tshitag ICI znd t}:'e Tahe-Ut Reel Spindle
lD) b rr^ns'lr.it the motol /rldtro,
to {D) so that th€ tape is
moved and wound on the take-up re€I.
The Tak€-Up Reel Spindle Base is made up of two plas-
tic rollers (l and 2l with a clutch felt in betw€€n. The ldler
is rot^titg
the plastic mUel (2) under.
Therefore, the tape-
winding friction is adjust€d by the slipping of the felt to
enabl€ rated winding of the tap€.
on the other ha d, the S*pfb
Reel Sbtndle IHI h^s a
Blake lo e/ lEl hwg on the Plastic Roll€r {4) under which
provides app.opriate back tension by the .lutch fet slipp-
ing to the rotation ofthe Pull€y (3)above.
To prevent accidental er^sure, the Record lnterloch But-
to, (F) mut be depressed before the RECORD, PLAY-
BACK knob can be moved to the "REC" position. The
Safet! dnice lclls
depressed to ente. the record mode
(See Fisures 2 and 3)
ffi
\
Slipping Rotation
Fig. 2
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