PDX 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.
