Akai AP-206

VIII. ELECTRICAL ADJUSTMENT
0
- -
- -
-
- -
-
-
-
-
-
0
~
15 14
13 12 11
10 9 8 7
6 5 4
0
3-
2-
DTP-I
I-
0
'"0
0
~OO
~
500B
DUTY
RATIO
VR4
VR5
VR6
~ ,:~.~~, zoxa
300KS
16 17 18 19
TORQUE
••••
§ OFF-SET VOLTAGE
DIFFERENCE
§ VR2,VR3 SPEED
o 0 0 0
0 VR2 VR3 2021
0
lOOKS lOOKS --
Fig.16 Direct Drive P.C Board Adjust Points
IDEAL
(All peaks are at the same level)
1. DIRECT DRNE p.e BOARD
ADJUSTMENT
1) Off-set Voltage Adjustment (VR4, VRS)
a) Disconnect the motor connection wire. (Open
pins 4 through 11 and 14,15 then leaving the
other pins connected.)
b) Connect a DC voltmeter (digital voltmeter)
between pins 6 and 8 (ground).
c) Short the circuit of pins 9 and 10.
d) Power "ON" (move the tone arm)
e) Adjust VR4 until the output at pin 6 IS OV ±10
mV for the AP-206/C and 80 ±1O mV for
AP-306/C.
f) Power "off' and open the circuit of pins 9 and
10.
g) Connect a DC voltmeter (digital voltmeter)
between pins 7 and 8 (ground).
h) Short the circuit of pins 4 and 5.
i) Power"ON" (move the tone arm).
j) Adjust the VR5 until the output at pin 7 is
OV ±10 mV for AP~206/C and 80 mV ±10 mV
for AP-306/C.
* After Off-set Voltage Adjustment, make the
connection as normal position.
'"
:.,:.. •..
BAD
(Peak levels are not equal)
Fig. 17
2) Duby Ratio (1: 1) Adjustment (VRl)
a) Connect an oscilloscope to rp-I.
b) Set the SPEED selector to the "33-1/3" posi-
tion.
For the AP-306/C, release the Quartz Lock
button to the OFF position.
c) Move the tone arm to rotate the motor.
d) Adjust VR1 until the oscilloscope shows a
waveform or as Fig. 17.
18