94MS20 Rev. B4
9-11
Lamp Voltage
The lamp voltage measurement can provide useful information for lamp
striking, lamp output and switching information. The meter used to
measure can cause different results. The waveforms are not sinusoidal,
so different meters may produce different results.
Here is a chart with typical measurements, (see P.C. Board Layout
Diagrams for the location of the test points).
See Shrouding The Lamp before continuing.
Lamp voltage measured from lamp lead common to:
Low
Med.
High
Trigger
Low (Yellow)
130
140
150
270
Medium (Brown)
270
140
150
270
High (Blue)
270
270
150
270
Path Of Power To The Lamp
The basic path is incoming line, safety interlock, P.C. Board, ballasts,
capacitors, back to the P.C. Board, then to the lamp.
In detail first see Path of Power to the P.C. Board.
Then see P.C. Board Layout, showing ballast power (yellow 120V) and
ballast common (yellow COM).
This is the feed to the ballast and should be 120 V~. The ballast then
feeds the capacitors with the wire labeled "CAP" (see Capacitors and
Level Switching for detailed wiring).
From the capacitors the power feeds back to the P.C. Board on the yellow,
brown, and blue wires. The P.C. Board does the electronic switching of
the capacitors and sends the power to the lamp.
Capacitors and Level Switching
The capacitors pass all the current that flows through the lamp. They are
also used to switch power levels. The capacitors are divided into three
sections. The unit has two low power (idle) capacitors connected with a
yellow wire. There is one medium power capacitor connected with a
brown wire. There is one high power capacitor connected with a blue
wire. All capacitors have an orange feed wire coming from the ballast.
The low power (idle) capacitors are always in the circuit. The medium
power capacitor gets pulled into the circuit for warm-up, medium power
exposures, and high power exposures. The high power capacitor gets
pulled into the circuit for warm-up and high power exposures.
Summary of Contents for OLITE
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