Akai AC-410

V. ELECTRICAL ADJUSTMENT
5-1. TAPE DECK SECTION
NOTE :
1) The following adjustment should be performed in
the “DECK test mode”.
To engage the DECK test mode, connect the AC
power cord to the AC outlet while pressing the
“TAPE-II" and “w ( F )” buttons together.
When the “DECK test mode” is engaged, the
“DUBX1” indicator on the FL display will light.
2) When performing the tape speed adjustment,
observe the following notes.
® Adjustment should be started more than 30
seconds after the power is switched ON.
© Adjustment should be made on X2 speed mode
first then adjust the normal speed mode.
e Adjustment should be made in the forward
direction.
3) To disengage the “DECK test mode”, press the
“POWER?” button or unplug the AC power cord
from the AC outlet.
1. Test
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ADJUSTMENT
2. Mode
3. Check point, adjustment part
4. Remarks (¢) and result ()
| 1 | TAPE-1 (X2) TAPE SPEED
1. 3,150 Hz test tape (TF-110CT)
2. TAPE-|, PLAY
3. TP-R.OUT, VR3100
4. ¢ Connect a frequency counter to the TP-R.OUT
(or LOUT) and press the “DUBBING” button
to engage double speed.
* 6,340 + 20 Hz
tape/input signal Adjustment Part
~
—
Test Point
| 2 | TAPE-I NORMAL TAPE SPEED
1. 3,150 Hz test tape (TF-110CT)
2. TAPE-I, PLAY
3. TP-R.OUT, VR3101
4.
©
Connect
a
frequency
counter
to
the
TP-R.OUT
and
press
the
“p(
F
)"
button
again
to
resume
normal
tape
speed.
* 3,150 + 10 Hz
3 | TAPE-Il (X2) TAPE SPEED
1. 3,150 Hz-test tape (TF-110CT)
2. TAPE-il, PLAY
3. TP-R.OUT, VR3102
4. © Press the “TAPE-II" button and play back the
test tape.
e Connect a frequency counter to the TP-R.OUT
and press the “DUBBING” button to engage
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Bes ee Y | 4 | TAPE-II NORMAL TAPE SPEED
VR3103
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:
con
1.
3,150
Hz
test
tape
(TF-110CT)
‘ ra “s. | 2. TAPE-I!, PLAY
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MAIN PCB
(PATTERN SIDE)
—
Ss,/3. TP-R.OUT, VR3103
4. ¢ Connect a frequency counter to the TP-R.OUT
and press the “p( F )" button again to
resume normal tape speed.
* 3,140 + 10 Hz
| 5 | BIAS OSC FREQUENCY
1. CrO2_ type blank tape
2. TAPE-II, REC
3. P1004 @ pin, 71731
4. e Connect a frequency counter between F°1004
pin and GND. (10 : 1 probe should be wsed to
avoid affecting the measurement.)
* Start a recording (press the “REC” butto n then
press the “P” button).
The “AUX” source indicator appeais auto-
matically.
* 100.0 + 0.2 kHz
17