Akai 1700 Service Manual

Fig. 1
VY TRANSPORT MECHANISM
Driving of Capstan
Figure 1.
{A) Motor
(B) Driving Belt (flat belt)
(C) Capstan
(D) Flywheel
High-speed rotation of Motor (A) is reduced by Driving
Belt (B) and transmitted to Capstan (C), which is connected
to Flywheel with ample inertia and enables rated rotation
by absorbing minor rotation distortion of motor itself.
Capstan Rotation 606 r.p.m. at 7-14” (19 cm) per sec.
303 r.p.m. at 3-34” (9.5 cm) per sec.*
151.5r.p.m. at 1-1" (4.75m) per sec.
Motor Rotation —_ 2,900 to 1,450 r.p.m. at 50 cps.
3,480 to 1,740 r.p.m. at 60 cps.
Driving of Pinch Roller
Put tape between rotating capstan and pinch roller and
push pinch roller against capstan, this will transport the
tape at rated speed. The appropriate pressure of pinch
roller is between 1,000 to 1,150 grams at the tape speed
of 7-14 (19 cm) per second.
Recording and Play Back
Turn the RECORD, PLAYBACK knob (A) to “PLAY”
position, and pinch roller presses against capstan to move
tape at the rated speed. At the same time, /dler (B) moves
between Motor Bushing (C) and the Take-Up Reel Spindle
(D) to transmit the motor rotation to (D) so that the tape is
moved and wound on the take-up reel.
The Take-Up Reel Spindle Base is made up of two plas-
tic rollers (1 and 2) with a clutch felt in between. The Idler
is rotating the plastic roller (2) under. Therefore, the tape-
winding friction is adjusted by the slipping of the felt to
enable rated winding of the tape.
On the other hand, the Supply Reel Spindle (H) has a
Brake roller (E) hung on the Plastic Roller (4) under which
provides appropriate back tension by the clutch felt slipp-
ing to the rotation of the Pulley (3) above.
To prevent accidental erasure, the Record Interlock But.
ton (F) must be depressed before the RECORD, PLAY-
BACK knob can be moved to the “REC” position. The
Safety device (G) is depressed to enter the record mode.
(See Figures 2 and 3)
Braked Rotation Slipping Rotation
io
Fig. 3

Akai 1700 Specifications

General

Brand	Akai
Model	1700
Category	Tape Deck
Language	English