Akai TX-500 - Electrical Adjustment

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 “mm (stop)” 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.
e Adjustment should be started more than 30
seconds after the power is switched ON.
1. Test tape/input signal
2. Mode
3. Check point, adjustment part
4. Remarks (#) and result (*)
Adjustment Part
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~e.
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~
~
fs
Test Point
| 2 | TAPE-| NORMAL TAPE SPEED
| 1 | TAPE-I (X2) TAPE SPEED
[5 | BIAS OSC FREQUENCY
e Adjustment should be made on X2 speed mode
first then adjust the normal speed mode.
e Adjustment should be made in the forward
1. 3,150 Hz test tape (TF-110CT)
2. TAPE-i, PLAY
1. 3,150 Hz test tape (TF-110CT)
2. TAPE-I, PLAY
1. Normal type blank tape
2. TAPE-II, REC
3. P11 @ pin, T1
3. TP-R.OUT, VR302
4. e Connect a frequency counter to the TP-R.OUT
and press the “DUBBING” button again to
resume normal tape speed.
%* 3,150 + 10 Hz
3. TP-R.OUT, VR301
4. © Connect a frequency counter to the TP-R.OUT
(or L.OUT) and press the “DUBBING” button
to engage double speed.
* 6,340 + 20 Hz
direction.
3) To disengage the “DECK test mode”, press the
“POWER” button or unplug the AC power cord
from the AC outlet.
4. © Connect a frequency counter between P11 @
pin and GND. (10 : 1 probe should be used to
avoid affecting the measurement.)
e Start a recording (press the “REC” button then
press the “” button).
The “AUX” source indicator appears auto-
matically.
* 100.0 + 0.2 kHz
[3 [TAPE-I(X2)TAPE SPEED
1. 3,150 Hz test tape (TF-110CT)
2. TAPE-II, PLAY
3. TP-R.OUT, VR303
4. © Press the “TAPE-II” button and play back the
test tape.
© Connect a frequency counter to the TP-R.OUT
and press the “DUBBING” button to engage
double speed.
* 6,320 + 20 Hz
| 4 | TAPE-II NORMAL TAPE SPEED
1. 3,150 Hz test tape (TF-110CT)
2. TAPE-I, PLAY
3. TP-R.OUT, VR304
4. ¢ Connect a frequency counter to the TP-R.OUT
and press the “DUBBING” button again to
resume normal tape speed.
* 3,140 + 10 Hz
en
~~
b oe
TP L.OUT TP GND TP R.OUT
TUNER/DECK PCB
7 (PARTS SIDE) T
:
a
;
3
3
%
i
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SERVICE MANUAL
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