Table of Contents
Advertisement
procedure, If it curls on the bottom side of the mirror
cassette (actually the inner side), tighten all the screws
equally; but loosen them if the tape begins to curl on the top
side(other side).
'
as seen from the side
Tighten screws
Loosen screws
of the erasehead.)
®.©, and @.
@,©, and @.
3. (Declination Adjustment)While
in the record/playback
position , set the back tension to O(wind the supply reel with
something thin like a pencil in counterclockwise direction)
and make
sure there is no
curling or shifting(shifting
up/shifting down)at the guide of the record/playback head.
Because shifting can only occur due to a difference in the
width of the tape and that of the tape guides(curling will
otherwise occur),it is necessary to pay close attention since
it can be easily overlooked.
When there is a shift, tighten screws @ and @ equally and
change the declination of the head. If the tape is shifting up,
tighten the screws, and if it is shifting down, loosen them.
. Repeat the adjustments in steps 2 and 3 and fine adjust the
height and the declination.
. (Preliminary Azimuth Adjustment)
After demagnetizing and cleaning the adjustment head, play
back WS-48B(3kHz, OdB).
Turn screw @ so that the reading on the level meter of the
unit or that of the level meter connected to LINE OUT is
maximized.
If the screw is turned at least half a revolution, repeat the
adjustments from step 1.
6. (Tape Path Check)Connect the oscilloscope to LINE
OUT and play back P-4~A100 (10kHz,-10dB)to display a
resurge waveform.
After 20 seconds
of record/playback
(after the tension
within the loop has been increased
sufficiently), make sure the variation in the resurge is
within + 90 degrees (within + 45 degrees is desired ).
If the variation is greater than this, it is because the decli-
nation and/or the height adjustment is not prefect. Repeat
the adjustment from step 1.
TC-K333ESA/K990ES
test tape
P-4-100S
(10 kHz, ~10 08)
Oscilloscope
UNE CUT
Oscilloscope Resurge Waveform
_In
Phase
45°
90°
195°
130°
nearness
erssnemamimnnm
A
rae
Good
Bad
Note: Only perform this adjustment when the erasehead is
. to be replaced.
1. Insert
the mirror
cassette
and put the unit
in re-
cord/playback mode.
2. (Azimuth Adjustment)Adjust the azimuth of the erase-
head by adjusting screws @ and @ so that the runs as
evenly as possible.
3. (Height adjustment)Tum 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.)
of.
Tape —»
Make. these the same
width.
Advertisement
Table of Contents
