Akai 1710W

VI. MECHANISM ADJUSTMENT
1. ADJUSTMENT OF PINCH WHEEL
It is important that the pinch wheel shaft is kept in
complete alignment with the capstan shaft. A proper
pinch wheel pressure is between 1,000 and 1,150 grams
when the unit is operated at the tape speed of 7-1/2 ips.
Any deviation from this specification will result in wow
and flutter. Check pinch wheel pressure by a spring
scale, and if necessary, adjust the pinch wheel load
spring.
2. ADJUSTMENT OF TAKE-UP IDLER
WHEEL
The take-up idler wheel must be kept in complete align-
ment with the take-up reel shaft. When the unit is set in
fast forward condition, the idler wheel will contact
with the upper knurled wheel of the take-up reel shaft
assembly, and it will contact with the lower knurled
wheel during record or play operation. Adjust idler
wheel load spring so that the idler wheel pressure is kept
between
50
and
80
grams.
The
idler
wheel
rapidly
wears
if
the
pressure
is
excessive.
Slippage
occurs
if
the
pressure
is
smaller
than
the
specification.
(a) Rewind reel shaft assy. (b) Take-up reel shaft assy.
|
reel Sd
reel table |'___reel stopper
reel table ; er
base plate
drive shaft
ring
rewind pulley
conical spring "=> ‘aétal- washer =
felt clutch «mm=ss—~retainer =a
take-up EEE
ia
a
drive
wheel
xr
t star-shaped
waa : woe
spring = oles
washer —— = > metal washer ss
retainer ~—>== nylon washer “==
oilite metal 4+— oilite metal
mig. plate t
star-shaped
—
ohn
=
coil
spring
spring for == paper washer :
brake == retainer washer
=e retainer
nto fi nylon spring
$>——->—- washer
set s
as leeve
- 34
Fig. |
3. ADJUSTMENT OF REWIND IDLER
WHEEL
The rewind idler wheel must be kept in complete align-
ment with the rewind reel shaft. The amount of pressure
to the knurled motor bushing should be maintained
about 50 grams during rewind operation. Adjust both
the idler load spring and rewind roller.
4. ADJUSTMENT OF INTERMEDIATE
WHEEL
The intermediate wheel is located between the rewind
idler wheel and the rubber ring which is used on the
upper part of the supply reel shaft assembly. When the
unit is set in rewind condition, it will contact with these
parts simultaneously transmitting torque of motor. An
adequate pressure is 50 grams. Adjust the load spring of
the intermediate wheel if the pressure is not sufficient.
5. ADJUSTMENT OF TAKE-UP REEL
SHAFT ASSEMBLY
A felt clutch material is attached to the bottom side of
the reel table base plate so that recording tape will not
be stretched during fast forwarding operation due to
excessive tension. To check the amount of friction of
this part, place a 5-inch reel with recording tape wound
by 60 m/m in diameter, and gently pull the end of tape
upward using a spring scale. Adjust the conical spring so
that the amount of tension at this part will be kept bet-
ween 400 to 500 grams. Another felt clutch material
is attached to the take-up drive wheel. It is to provide
proper slipping operation during record or play mode.
The procedure for checking friction of this part is same
as the foregoing, and between 150 and 200 grams of
friction will provide the best result. Adjust the star-
shaped spring just under the take-up drive wheel. When
the unit is set to rewind operation, the amount of
friction of this part will be greatly reduced and will
become 15 to 20 grams. Check to see whether this is
satisfactory, if not, readjust the star-shaped spring for
Brake, and spring retainer washer accordingly.
(See figure 1 (b) at left)
6. ADJUSTMENT OF SUPPLY REEL
SHAFT ASSEMBLY
Felt clutch material is used between the lower side of
the reel table base plate and the rewind rubberring to
protect recording tape from excessive tension dui ng the
recording operation. To check the amount of friction of
this part, place onto the supply reel table a 5—imch reel
with a tape 60 m/m in diameter, and gently pull the end
of tape upward by a spring scale. Adjust the conical
spring so that the amount of tension is kept be tween
400 and 500 grams. Other felt clutch matwial is
attached to the rewind drive wheel to provide proper
slipping operation during record or play operation. The
procedure for checking friction of this part is the same
as the foregoing, and between 80 and 120 gnams of
friction will give the best result. When the unit 4 set to
fast forward operation, the amount of friction will be
greatly reduced and will become 15 — 20 grams.
Check to see whether this is correct. If not, readji st coil
spring and spring retainer washer. (See figure ] (a) at
left)
[9]