Sony TC-K670 - Mechanical Adjustment Details; Erasehead Adjustment Procedures; Torque and Pinch Roller Force Specifications

> TC-K670/K677ES
Note:
Only
perform
this
adjustment
when
the
erasehead is to be replaced.
Insert
the
mirror
cassette
and
put
the
unit
in
record/
playback
mode.
(Azimuth
Adjustment)
Adjust
the
azimuth
of
the
erasehead
by
adjusting
screws
@
and
@
so
that
the
tape
runs
as
evenly
as
possible.
pe
tor
TT
Tighten @ Tighten @
Loosen @ Loosen @
(The
erasehead
as
seen
when
erasing
the
mirror
cassette.)
Normal
(Height adjustment) Turn screws ®,@, and @ all
by the same angle so that the portions of the
erasehead visible at top and bottom are nearly
of equal width. If the width at the top is greater,
tighten the screws; if the width at the bottom
is greater, loosen the screws.
Erasehead
(The
erasehead
as
seen
through
the
mirror cassette.)
4.
Tape —»
a Cay
Make these the same width.
(Declination Adjustment) Leaving it in the
playback position, put the back tension to 0 and
make certain the erasehead part and supply pinch
roller guide part do not shift. If there is a shift,
turn the screw ® and change the declination.
Looking at it using the mirror cassette, if the
tape shifts up, tighten the screw, and if it shifts
down, loosen the screw.
Repeat the adjustments beginning with step 2 and
fine adjust the height and declination. And make
sure the tape does not curl up on the pinch roller
guide or the guide part of the record/playback
head.
(Depth Adjustment) In order to make the entire
head play the tape smoothly, and to make sure
the depth of the erasehead is neither too shallow
nor too deep, loosen screw @ a bit,
About 0.56 mm
ae _}
T I oa
Normal Erasehead ~~
|
Record/ playback
“fT
|
7
>
head
Not deep enough Too deep
Check
1. Check to make sure that there are no curls or
shifts throughout the whole tape path and that
the tape runs smoothly.
2. Reapply the locking compound to the adjusted
screws. (The locking compound should only be
applied to screw © after the azimuth has been
adjusted.)
TORQUE MEASUREMENT
Torque Torque meter
C Q-102C ‘28-60 g- cm(0, 39-0. 83 02 + inch)
FWD
CQ-102C
TC-K570:1-5
g
+
cm(0.
014-0.
069
oz
+
inch)
Back
tension
|
Yo-ro/eorrs:7-1
g
+
cm(0.
097-0.
15
0z
*
inch)
PF, REW| CQ-201B | 85-90 g + cm(0, 9-1. 25 02 « inch)
Meter reading
Pinch Rolier Pressing Force Measurement
Mode : playback
Hook needle of the tension gauge to the pinch roller
shaft and push back pinch roller to detach it from
capstan. Then, return it gradually to capstan and
read the gauge when the pinch roller begins turnning.
Standard Limits :
Tape-up side .
TC-K570 : 210-320 g(7. 4-11.3 02)
TC-K670/K677ES : 270-350 g(9. 5-120 02)
Supply side
TC-K670/K677ES : 180-280 g(6. 4-9.9 oz)
capstan
pinch roller
tension gauge