P
DX a2
Adjustment manual
1. Temperature Sensor Comparative Voltage Adjustment
Measurement Point
:
TP-4 (VC) TP-I(GND)
Adjusting Point
:
R351 (470ohm Cermet Trimmer
Measurement Equipment
:
DC Millivoltmeter (input impedance I00K ohm )
Setting Conditions
:
Power on. Turntable stopped.
Adjustment Sequence :
(1)
Power on.
(2)
Connect DC Millivoltmeter to TP-4.
(3)
Adjust R351 to give 1,540mV± 5mV.
2. Center Frequency of Pitch Control Adjustment
Measurement Point :
TP-3 (CP) TP-I(GND)
Adjusting Point
:
L501 (3.3mil OSC Coil)
Measurement Equipment
:
Frequency Counter
Setting Conditions
:
Power on.- Turntable stopped. Quartz Lock o-ff.
Adjustment Sequence:
(1)
Power on.
(2)
Connect Frequency Counter to TP-3-
(3)
Pitch control fader center position.
(4)
Adjust L501 for Frequency Counter 230.4KIlz ±0.IKHz.
3. Meter Sensitivity adjustment.
Measurement Point
:
Check meter needle deflection.
Adjusting Point
:
R506 (4.7Kohm Cermet Trimmer)
Measurement Equipment: :
N/A
Setting Conditions
:
Power on. Turntable stopped. Quartz Lock off.
Adjustment Sequence:
(1)
Power on.
(2)
Quartz Lock off.
(3)
Set Pitch control fader to @10% position.
(4)
Adjust R506 so that meter shows +10%.
(5)
Set Pitch control fader to -10% position.
(6)
Recheck points so that -10% and +10% are in correct
position.
4. APC Offset Adjustment
Measurement Point
:
TP-2 (APC) TP-1(GND)
Adjusting Point
:
R308 (47Kohm Cermet Trimmer)
Measurement Equipment
:
DC Millivoltmeter (input impedance 100Kohm.)
Setting Condition
:
Power on. Turntable 33 1/3rpm. Quartz Lock on.
Adjustment Sequence:
(1)
Power on.
(2)
Quartz Lock on, Speed 33 1/3 rpm, Start.
(3) Adjust R308 so that DC Millivoltmeter shows
3.5volt±0.2volt.
(4) Set Pitch control fader to -10% position.
NOTE; Rotate R308 slowly to allow correct voltage to set.
