Accuprint AP30CL - 6000 Service Manual page 109

94MS41 Rev. C1 S/W Ver 2.06
8) Check capacitors and relay circuit by:
The capacitors and relays are checked by watching the voltage changes
that take place at the different intensity levels. If a capacitor is not in the
circuit the voltage readings on input and output will be the same. If the
capacitor is pulled into the circuit the input and output voltages will be
hundreds of volts apart. Now the tricky part, if a capacitor is pulled into
the circuit the way it is supposed to be then we need to look at the voltage
itself to see if we see an increase in the overall voltage to make sure that
the capacitor is adding voltage to the circuit. If the capacitor is pulled
into the circuit when it is supposed to be but the overall voltage does not
increase then the capacitor is defective.
9) Check voltage from terminal 3 to the capacitor input (orange wire on top
of the capacitors). The voltage should be 500+ V~. If voltage is lower,
check the power path to the tap switch and ballasts. 500+V~ is typical
for 5kW light sources and 700+ V~ for the 6kW and 8kW light sources.
If the voltage on a 208/240V~ is low, then not all the ballasts are being
powered properly. This is usually caused by a bad tap switch or a burnt
connector at the tap switch, however any of the wiring between ballast
and tap switch is suspect. If the voltage is zero then a burnt wire at the
power relay or a bad power relay is most likely the problem. There is a
possibility that if there is zero V~ that you might have a grounded safety
interlock circuit.
• At idle, check voltage from terminal 3 to the capacitor outputs (yellow,
brown, and blue wires on top of the capacitors).
On the following charts find the Wattage of the unit you are working on
and then for the lamp installed into the unit, these are the general voltages
you should read. These voltages are a ball park figure depending upon
several factors and the actual voltage is not as important as to whether or
not the voltages change on the capacitors according to intensity level.
For instance on a 5kW light with an L1250 lamp at low intensity one
capacitor will be about 200V~ and three capacitors will be over 500V~.
Now when you go to medium intensity you should see two capacitors at
about 230V~ and two capacitors at over 500V~. NOTE the number of
capacitors at the lower voltage (i.e. in the circuit) and the voltage increase
from the previous intensity 200V~ at low and 230V~ at medium.
• At low power, manual expose on, check voltage from terminal 3 to the
capacitor outputs (yellow, brown, and blue wires on top of the capacitors).
• At medium power, manual expose on, check voltage from terminal 3 to
the capacitor outputs (yellow, brown, and blue wires on top of the
capacitors).
• At high power, manual expose on, check voltage from terminal 3 to the
capacitor outputs (yellow, brown, and blue wires on top of the capacitors).
• SEE CHART FOR PROPER VOLTAGE READINGS (ALL
VOLTAGES ARE READ TO TERMINAL 3).
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