3-2-2. Tape Transport System Adjustment
1) Pm-adjustment
When parts are replaced, perform the required adjustments
by referring to the procedures for the tape transport
system. When parts are replaced, the tape path may be
changed.
First run a T-l 60 tape and be sure excessive tape wrinkle
does not occur at any tape guide.
1. If tape wrinkles at the
S.
T-guide rollers, turn
the S,T-guide rollers until the wrinkle
drsappears.
2. If tape still wrinkles at the tape
gurde,
do the tilt adjustment of the A/C head.
2) Adjustment procedures
1. A/C head assembly adjustment
Test
Point
:
TP302 (Envelope)
TP804
(Audio
Out)
TP202
(H’D
SW Pulse
-Trigger)
TP201 (Control Pulse)
Test Tape :
ST-N1
(Blank Tape (T-160)
L
0
Fig. 3 Location of Test Point (Main
PCB)
a. A/C head height adjustment
1. Run the alignment tape (ST-Nl)
In
the playback
mode.
2. Observe the surface of the audio head using a
dental mirror.
3. Turn screws(A), (B), (C) clockwise or
counterclockwise until the gap of the lower tape
edge and the lower edge of the control head is
about 0.25 mm. (Refer to
Fig.
4. and 5.)
I----
CCREW
(6)
SCREW(C)
ITU
An.11
IST
TILT
ADJUST
X
-
POSITION
ADJUST GEAR(E).
HOLE (F)
\
SCREW(D)
X
-
POSITION LOCKING
SCREW (A)
HEIGHT ADJUST
Fig.
4 Locatron of A/C Head Adjustment Screw
AUDIO HEAD
VIDEO TAPE
0
-
0.25mm
I
CONTROL HEAD
Fig.
5 A/C Head
Height
Adjustment
b. A/C head tilt adjustment
1. Playback a T-160 tape and observe the
posItron
of
the tape at the lower flange of the tape
guide.
2. Confirm that there IS no curl or wnnkle at the lower
flange of the tape guide, as shown
In
Fig. 6
(B).
3. If a curls or wrinkle of the tape has
occured,
slrghtlyturn
the screw (C) tilt adjust on the
A/C
head ass’y clockwise
until
It
disappears, as shown in
Fig.
6
(B)
4. Reconfirm the A/C head height.
(BAD)
Fig. 6 Tape Guide Check
3-4
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