Akai MX-550

IV. ELECTRICAL ADJUSTMENT
Before making adjustments 1 - 5, load a test disc as follows.
After first setting the unit to the test mode 1, press the »/# button to open the disc tray and place a SONY TYPE 3 test disc on
the DISC 1 holder. Press the »/4 button again to close the tray. Adjustments can now be made.
1. TEST DISC
Test point
ADJUSTMENT
2. MODE or TEST mode
3. TEST POINT and ADJUSTMENT parts.
4. REMARK (¢), RESULT (-)
ADJ.part
FOCUS OFF-SET
2. Test mode 2 and 1
3. FE (TP-2)/VR5
*A=B
1. Test disc SONY TYPE 3 (AT-711881)
4. «Connect a digital DC voltmeter to the TP 2 (FE)
and check the voltage A in the test mode 2, then
press STOP button and adjust the voltage B so
that the reading on the digital DC voltmeter is
the same as voltage A.
| 4 | TRACKING SERVO GAIN
1. Test disc SONY TYPE 3 (AT-711881)
2. Test mode 5
3. Pi @pin/ VR4
4. eConnect an oscilloscope to the P1 connector
© pin.
%*500 to 800mVp-p
[+00 to SOOmVp- p
MUSIC CALENDAR
button
TEST MODE | HOW TO SET EACH MODE | FUNCTION
While pressing the li and ¢|ndicates that unit is set
1 PP buttons, into the TEST mode. ON OFF OFF 1
insert the power cord.
fe pe ea FADE AID Io oe
2 Press the & OPEN/CLOSE | .eocus SERVO is on. OFF | ON | OFF. 2
DISC 1 button
~_| Press the & OPEN/CLOSE
3 *CLV-S SERVO is on. ON | ON | OFF 3
[ DISC 2 button ies
4 Press the & OPEN/CLOSE | . +p ackING SERVO ison. | OFF | OFF | ON 4
DISC 3 button
2 Press the PLAY ® DISC 1 | *CLV-AandSLEDSERVO | oy | ore | on -
button are on.
6 Press the PEAY P DISC 2: |. SANTI SHOCKis on OFF | ON | ON 6
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OFF—SET, ie
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VR4
TRACKING
GAIN
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A
(TP=1) |
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vb MAIN PCB
FRONT
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FOCUS SERVO GAIN
. Test disc SONY TYPE 3 (AT-711881)
. Test mode 5
. P1® pin/ VR3
. «Connect an oscilloscope to the P1 connector
pin
*1.0 to 1.4Vp-p
E-F BALANCE
. Test mode 3
. TE (TP 2)/VR2
1.
2
3
4
*A=B
Test disc SONY TYPE 3 (AT-711881)
. eConnect an oscilloscope to the TP 2 (TE)
. Test mode 1
. WECK (TP-1) / VR 1
. eConnect a frequency counter to the TP 1
(WECK).
*7,350 +10Hz
The disc tray can be opened or closed by pressing the > / mm button (during any mode).
After opening the tray, closing it will move the pick up to the inward position and return the unit to the TEST MODE 1.
¢ Pressing the @ button will return the unit to the TEST MODE 1 regardless of the test mode presently engaged. However,
the pick up will not be moved.
Test modes can be selected directly.
SERVICE” AA ANU A La ee
41
CD-650