Luxman PD-121 - Alignment Procedure; PB-650 D.C. Voltage Adjustment

MODEL: PD-121,131
Features of Black light by using a small
Cold Cathode Ultra violet light tube
This small discharge type tube was developed for use in our turntable. As its features far out
weighed that of the conventional Orange Neon as strobo~scope timing light.
It differs in operation from the usual fluorecent tube in that it has no starting filaments, but
instead has a small electrode near each main cathode at each end of the tube. So discharge is
enabled by a high firing voltage (250 volts).
However, since mercury is used as the gaseous medium in the sealed tube operation at very low
temperatures eg. below 5°C is very difficult. But with the special firing circuits used in the
PD-121, operation is guaranteed from above 0°C.
This tube is characterized by
1) Low power consumption (0.7W)
2) Low operating temperature
3) Smali-size
4) Long-life (20,000 hours)
5) Ultra Violet light at 3650 ik
So to make the strobo-scope pattern very clear as if to appear stationary, the tube is fired by
short duration pulses, and to make for a high visibility "dayglo” type paint is used for the strobo
markings, this type of paint converts Ultra violet light into visible coloured light.
MAIN MAIN
ALIGNMENT PROCEDURE
1) PB-650 D.C. voltage adjust
13.5 0.5 - PD121
| WE OSV -PD131
~ YAL-VOL