Akai AC-220 User Manual

IV. ELECTRICAL ADJUSTMENT
4-1. CASSETTE DECK ELECTRICAL ADJUSTMENT
PRECAUTIONS: Before adjustment, clean and demagnetize the heads and tape guides.
ADJUSTMENT STEP:
1. TEST TAPEffEST CONDTION
2. MODE
3. CHECK POINT/ADJUSTMENT PART
4. REMARK(•---> Test point) AND RESULT (*-3>-Adjustment part)
2 TAPE II NORMAL(x)1 SPEED
1. 3,000Hz Test Tape
2. play
3. Adjust VR508
4. Connect a frequency counter to
play L&R output test point TP3
(GND) and TP1 (LCH),
TP2
(RCH) 3000Hz ± 30Hz
,----
1
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1 TAPE II HIGH(x)2 SPEED
1. 3,000Hz Test Tape
2. Tape
II, play; Tape I, REC and
HIGH DUBBING
3. Adjust VR509
4. Connect a frequency counter to
play L&R output test point TP3
(GND) and TP1 (LCH), TP2
(RCH) 6000Hz
± 60Hz
--L-------,--7---7
,---------.---1------1----
CDffUNER/TAPE
PCB (TOPVIEW)
VR509
VR508
(GND)
TP6
(RCH) VR501
9~
VR502 (LCH)
@9
I I
I I
L ____ _
CN106
r-0
I
3 BIAS OSC FREQUENCY
1. No input signal, normal recording
test tape.
2. REC
3. Adjust T503
4. • Connect a frequency counter
between CN106 GND
& ERASE
* 96KHz+2/-1 KHz
-f
I
I
I
I
I
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__ _
13
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c3
6
I
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TP1
(RCH)
TP2
[3
(LCH)
TP3
(GND)
EQ/AMP P.C BOARD
(BOTTOM VIEW)
4 NORMAL POSITION BIAS
1. Connect AC Voltmeter between TP6
(GNO) and TP5(Lch), TP7(Rch) Rec
Adjust VR502(Lch), VR501(Rch) to
10mV (6.5mV AC-220)
2. AUX INPUT 1 KHz and 1 0KHz
LEVEL -20dB (Ref: TAPE 0dB)
3. REC and PB
4. Confirm the signal level of 1KHz and
1 0KHz is equal or within +0/-3dB
If
not good, repeat 1-3 steps

Akai AC-220 Specifications

General

Brand	Akai
Model	AC-220
Category	Stereo System
Language	English