Akai AX-890 User Manual

V. ELECTRICAL ADJUSTMENT
NOTE:
1) The following adjustment should be performed in
the “ADJUSTMENT TEST MODE". To engage
the “ADJUSTMENT TEST MODE", connect the
AC power cord to the AC outlet while pressing the
TAPE-| ‘®” and “DUBBING START” buttons
together.
When the “ADJUSTMENT TEST MODE” is
engaged, the X1 DUB indicator is lit.
2) When performing the tape speed adjustment,
observe the following notes.
e Adjustment should be started more than 30
seconds after the power is ON.
e Adjustment should be made at X2 speed mode
first then normal speed mode.
e Adjustment should be made in the forward
direction. ,
3) To disengage the adjustment test mode, unplug
the AC power cord from the AC outlet.
4) Set the DOLBY NR switch to the “OFF” position
during adjustment.
5) Use one of the following tapes during adjustment
in step 9.
Normal tape : Maxell UDI C-60
CrO2tape :TDK SAC-60
Metal tape :TDK MAC-60
6) Before and after adjustment, clean and de-
magnetize the heads.
STEP | ADJUSTMENT
1. Test tape/input signal
2.
Mode
<>
Adjustment
Part
om
13. Check point, adjustment part ~
Test Point
4. Remarks (¢) and result ()
s]DIPPOINT
1. Normal type blank tape
2. TAPE-II REC 7
3. R413, T402 (L) & T452 (R) a
4, ¢ Connect a DC voltmeter to both of the R413's
leads,
* Turn the core of the T402 and T452 alternately
so that the meter registers a minimum reading.
1. Normal type blank tape
2. TAPE-II REC
3. C405, T401
4. ¢« Connect a frequency counter between C405's
lead and GND. (10: 1 probe should be used to
avoid affecting to the measurement.)
* Turn the core of the T401 so that the frequency
is 100.0 + 0.2 kHz.
[3 | TAPE-Ii (X2) TAPE SPEED
1. 3,150 Hz test tape (TF-110CT) -
2. PLAY
3. LINE OUT, VR603
4. ¢ Connect a frequency counter to LINE OUT
and press the “DUBBING START” button to
engage the double tape speed.
* 6,300 + 20 Hz
BIAS OSC PCB
|2 |TAPE-I NORMAL TAPE SPEED
1. 3,150 Hz test tape (TF-110CT)
2. PLAY
3. LINE OUT,VR602
to resume normal tape Spped:
* 3,150 + 10 Hz
DECK PCB
4. ¢ Connect a frequency counter to LINE OUT
and press the “DUBBING START" button again | .
SERVICE MANUAL
[4|TAPE-IINORMAL TAPE SPEED
1. 3,150 Hz test tape (TF-110CT)
2. PLAY
3. LINE OUT, VR604
4. ¢ Connect a frequency counter to LINE OUT
and press the “DUBBING START" button again
to resume normal tape speed.
3,150 + 10 Hz
1. 3,150 Hz test tape (TF-110CT)
2. PLAY
3. LINE OUT, VR601
engage the double tape speed.
* 6,300 + 20 Hz.
[4 | TAPE-I (X2) TAPE SPEED
4. ¢ Connect a frequency counter to LINE OUT
-. and press the “DUBBING START" button. to
5 | TAPE-I PB LEVEL
1. 315 Hz test tape (TF-101CL)
2. PLAY
3. Line out
4. ¢ Connect an AC milli-voltmeter to LINE OUT.
e Press the “AUDIO I-HQ” button during
playback.
%* Confirm that both the L and R output levels
are -6.0 + 3 dBs after the AUDIO I-HQ indicator
in the FL display has disappeared.
[6]TAPE-NPBLEVEL =
1. 315 Hz test tape (TF-101CL)
2. PLAY
3. Line out”
4. ¢ Connect an AC milli-voltmeter to LINE OUT.
e Press the “AUDIO I-HQ” button during
playback.
* Confirm that both the L and R output levels
are —6.0 + 3 dBs after the AUDIO I-HQ indicator
in the FL display has disappeared.
4. ¢ Load a normal type blank tape and start
recording.
* Press the “AUDIO I-HQ" button and then eject
the tape after the AUDIO I-HQ indicator in the
FL display disappeared and the "REC PAUSE”
mode has been engaged.
* Change the tape to the CrO2z and Metal types
respectively and repeat the preset with the
same manner as normal

Akai AX-890 Specifications

General

Brand	Akai
Model	AX-890
Category	Stereo System
Language	English