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21
ADJUSTMENT OF THE TPAE TRANSPORTING SECTION. (CONTINUED)
A. Adjustment of the S/T GUIDE ROLLER
a. Check the Playing back with a T-120 TAPE.
b. Make sure that excessive tape wrinkle does not occure at
eatch S.T GUIDE ROLLER.
c. If tape wrinkle is observed at the S/T GUIDE ROLLER,
turn the guide roller screw until there is not tape wrinkle.
B. Adjustment of the AC HEAD ASS’Y(TILT)
a. Play back a T-120 TAPE and check the running status of
lower side of GUIDE POST.
b. If there is any problem, Turn the AC HEAD TILT
SCREW until the running status improved (Fig. 5.2)
C.Adjustment of the AC HEAD Height(Fig. 5.3)
a. Play back T-120 TAPE.
b. Make sure that the gap between the lower end of AC head
is 0.25m.
c. If the measurement of the gap is different from the refer-
ence value 0.25m, turn the screw !,# until the desired
gap is obtained.
D.Adjustment of the AUDIO AZIMUTH(Fig. 5.4)
a. Play back the ALIGNMENT TAPE
(DN2 : SP, NTSC,7KHz)
b. Check the AUDIO output with a AUDIO LEVEL
METER.
c. Turn the AC HEAD AZIMUTH SCREW @ until the
maximum AUDIO output(-9dBm ~ -3dBm)is obtained.
E. Adjustment of the X-POSITION(Fig. 5.4 5.5)
a. Connect the PATH ADJ. FIXTURE to the PT01 on the
MAIN CIRCUIT BOARD.
b. Play back theALIGNMENT TAPE
(DN2 : SP MONOSCOPE).
c. Connect the S/W pin and ENVE pin of the PATH ADJ.
FIXTURE with the SCOPE PROBE.
d. Insert the adjustment bar in the AC HEAD ADJUST hole
$ and adjust the X-POSITION of the AC HEAD ASS’Y
until the ENVE is maximum when the VR is on the CEN-
TER.
* Three is the possibility that an another TRACKING CEN-
TER can be occur when the AC HEAD ASS’Y turned
completely in the counterclockwise direction, Hence
adjust the X-position with AC HEAD ASS’Y adhering
closely to the right side until the maximum ENVE is
obtained.
e. The adjustment of the X-POSITION finished, check if the
AUDIO LEVEL is degraded, then readjustment of the
AUDIO AZIMUTH is required.
FIg.5.2 Adjustment of the AC HEAD ASS’Y
FIg.5.3 Adjustment of X-POSITION
FIg.5.4 Adjustment of AUDIO AZIMUTH, X-POSITION
S/W PULSE TEST PIN PATH ADJ. FIXTURE
ENVELOPE TEST PIN PATH ADJ.FIXTURE
Measurement Equipment OSILLOSCOPE
VR CONTROL PATH ADJ.FIXTURE
AC HEAD ADJUST HOLE ADJUSTMENT BAR
Test Point
Adjustment