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Each grid of the FL display tube sequentially lights up while
all tubes being lighted up finally.
\
Level meters go out one after one.
Y
Press any of the remote controller for DAT in this state. Thus,
all level meters go out. (It may sometimes occur that one or
two meters remain lighting up according to switch setting at
that time.)
q
Everytime a switch on the panel is pressed, display tubes light
up sequentially one after one. With all keys once pressed, all
level meters go out.
¢
To reset the test mode, disconnect the wire shorting XTEST
and GND. After completion of adjusting, be sure to reset the
test mode.
Adjust Parts Location
— Mechanism assembly —
9. Check the following items for correct tape speed, after comple-
tion of adjusting.
(1) Set the REC MODE switch to STANDARD and check for
normal recording and playback. (x 1)
(2) Set the REC MODE switch to LONG and check for normal
recording and playback. (x 0.5)
(3) With QUE (> + PP) or REVIEW (> + <4), check that qurrr,
qurrr sound is heard. (x 3, x 8)
(4) Check thatcorrecttime is displayed after FF (PP) or REV (<4).
(x 16)
(5) Check that SEARCH (Ce, KK) is normal.
— Main board —
(Component side)
CN501
PBRF
O«SWP
9«GCA
o«XTEST MAIN
T-END
1C330
S-END
oe
D321
0<BATT-
BATT+
CN151
CN301
o«XTEST SERVO
@ rve601
— Control SW board —
(Conductor side)
{[3CN752
FWD back tension
adjustment screw
3-1.
ELECTRICAL ADJUSTMENTS
End Sensor Check
Perform the following adjustment when the holder has been removed
or part of the mechanism deck section replaced.
Check Procedure:
1. Connect an oscilloscope to the test land SE (in the S side) and TE
(in the T side) of the main board.
2. Actuate the test mode (main- servo), mount an end sensor cassette
and effect the STOP (MB) mode.
3. Check that p-p values of waveform of the oscilloscope satisfy the
following.
In the S side: 300mVp-p or more
In the T side: 150mVp-p or more
FWD Torque Adjustment
Adjustment Procedure:
1. Put the set into the test mode (main - servo) and load the FWD
torque meter TW-7131 (8-909-708-71).
2. Put the set into the PLAY (») mode.
3. Adjust RV601 so that the minimum value of FWD take up torque
(take-up side rewinding torque) is between 10-11 g-cm (0.14-
0.15 oz:inch). Also, make sure that the maximum reading does
not exceed 16 g+cm (does not exceed 0.22 02: inch).
4. Confirm that the value indicated by the torque meter is maintained
for one full cycle.
Adjustment Point: MAIN board
FWD Back Tension Adjustment
Adjustment procedure:
1. Put the set into the test mode (main - servo) and load the FWD
torque meter TW-7131 (8-909-708-71)
2. Put the set into the PLAY (®) mode.
3. Turn the FWD
back tension adjustment screw locked on the
mechanical deck side so that the minimum value of FWD back
tension torque (supply side) is between 4—5 g-cm (0.06
— 0.07
oz: inch).
Also, make sure that the maximum reading does not exceed 8 g-
cm (does not exceed 0.11 02: inch).
After completion of adjusting, be sure to apply screw lock.
4. Confirm that value indicated by the torque meter is maintained for
one full cycle.
To tighten (clockwise) — back tension becomes larger.
To loosen (counterclockwise) — back tension becomes smaller.
Tape Path Fine Adjustments (x 1.5 FWD Mode)
Perform the following adjustment when the drum has been replaced.
Adjustment Procedure :
1. Connect an oscilloscope CH-1 to TP (PBRF) and CH-2 to TP
(SWP) on the main board.
2. Put the set into the test mode (main - servo) and load test tape TY-
7252 (8-909-822-00).
3. Press the AMS (CP) key.
Each part of switches on Test Mode.
OFF
SET
ATE
=
0
+
REC MODE
|
|
|
STANDARD
ee
_
TIMER
LONG
441kHz2
48kHz
4. With the REC MODE switch set to STANDARD (ATF: OFF)
and the TIMER switch set to PLAY or REC (OFFSET: + or -),
fine adjust the S1 and T1 guides so that the oscilloscope RF signal
waveform remains the same when high-low is repeated.
* Finish the adjustment by screwing in.
5. Check the RF signal waveform with the REC MODE switch set
to LONG (ATF: ON) and the TIMER switch set to PLAY or REC
(OFFSET: + or -).
6. Check the RF signal waveform with the REC MODE switch set
to LONG (ATF: ON) and the TIMER switch set to PLAY or REC
(OFFSET: 0).
(1) Confirm theat the RF signal waveform peak value (B) is 60
mV or more.
ATF Pilot
Perform thi
cassette.
CH-2 to
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