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System Manual
WARNING
BEFORE PROCEEDING WITH ANY MAINTENANCE WORK, READ SECTION 1 - HEALTH AND SAFETY
.
Unable to strike a
Plasma (continued)
7)
Is the RF ON indicator on when requesting RF power? If not:
a)
Check the rf power demand is not zero
b)
Check the rf remote cable is properly connected
c)
Check the vacuum interlock is made
d)
Contact an Oxford Instruments Plasma Technology engineer.
8)
Check that the reflected RF power is less than 10% of the forward
power. If not, carry out the following checks:
a)
Check the cable between the RF generator and the automatch unit.
b)
Check the connection between the automatch and electrode.
c)
RF electrode resistance to chassis should be > 1Mohm, if
significantly less, look for a short circuit.
d)
If manual control of the automatch is available, attempt a manual
match. If, in a manual match the reflected power can be reduced to
less than 10% of forward power, the problem is in the automatch
unit – refer to the automatch manual.
9)
Check that the plasma really is absent: low power and high pressure
plasmas in O2 or SF6 emit very little visible light; DC bias values will be
low for these plasmas, and low or zero for PECVD, PE- mode and RIE
mode when an insulating cover plate is used.
10)
Check the condition of the process chamber. Heavy contamination of
either electrode can lead to difficulty in striking a plasma
11)
Try starting the plasma with the automatch capacitors at different
staring values. The approach to match can sometimes take the electrode
through a maximum voltage point which assists starting.
12)
If the reflected power is low but the pressure is too low to strike the
plasma, do NOT raise the power for more than one minute in an attempt
to strike. The power is being dissipated in the matching unit, which will
get hot.
13)
Do NOT use a Tesla coil or similar sparking device: voltages from these
devices exceed the ESD test limits of the equipment, causing permanent
damage.
In PC 2000, on the
Pump Control
page, the Water
Off indicator is
coloured red.
1) Check that the cooling water supplies are connected and turned on.
Troubleshooting
Issue 1: August 07
Page 7-6 of 12
Printed: 25-Oct-07, 11:47
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