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Chapter 3---Electrical
3-6
Model 250 Service Manual
ALPS - Inputs:
AC input power: Directly from the AC Line Filter. The input range is from 220-
240 VAC, at 50/60 Hz.
/LAMP_ENA - from the System Controller PCB. Turns on the ALPS.
/COVER_ON - signal enabling the Arc Lamp Power Supply.
/LAMP_OK - the input is jumpered at the Arc Lamp Power Supply (tied to
ground) so it is always low.
/ = Active Low
ALPS - Outputs:
!
+170 VDC output during the boost phase to get Arc Lamp ignition. This
supplies the power for the Igniter.
!
Run Voltage - 25 to 31 V to maintain the arc lamp operation.
!
Current - 70 to 85 amps to maintain the arc lamp operation.
!
LAMP_OUT - Lamp output voltage, positive.
!
LAMP_RTN - Lamp return.
!
/LAMP_LIT - signal to System Controller PCB indicating that the Arc Lamp
is lit.
!
/LAMP_OK - signal to System Controller PCB (no real indication).