Precision II Operation and Maintenance Manual C
3-32
996-0255 rev. b
EOC FAILURE PU [x]
[x] represents the power unit(s) that have failed to charge. If more than
one power unit has failed to charge, the display will sucessively show on
the 1st line the power units that have failed.
d) FIRE
In the manual mode, pressing this key causes a fire com-
mand to be issued to the power units. The shot count will
be incremented by 1.
The power units generate a trigger signal to the capacitor
bank(s) and the flashlamp(s) will flash. If the fire key is
pressed, without the capacitor banks charged, the
CU601C halts the issuance of a fire command to the
power units. The fire button may also be used as a “single
shot” command when in the automode (refer to “PA-
RAMETER SELECT” below).
e) SHUTTER
The shutter only opens in auto mode in program 2 or
greater. Pressing the shutter key causes the shutter to
toggle open or closed. The shutter LED, when on, indi-
cates that the shutter is open and the oscillator cavity is
free to oscillate. When the shutter LED is off this indicates
that the shutter is inserted into the oscillator cavity and
lasing action is inhibited.
f) Q-SWITCH ON/OFF
This key must be ON in order to activate the Q-switch.
When the Q-switch is ON the red LED labeled “Q-
SWITCH ACTIVE” will also be lit.
g) PARAMETER SELECT
This key only works in the auto mode and when a pro-
gram has been selected, but not activated. This mode will
not change PGM 1-3 which are factory set. When pressed
a blinking cursor will appear over one of the three laser
parameters (Pulse division, Rep rate, or parameter). When
the cursor is positioned over the appropriate parameter,
that parameter may be changed using the parameter
increment or parameter decrement keys.
The Q-switch delay shows the delay time that the CU601C will wait
before Q-switch action occurs (after receiving a Q-switch trigger signal
from the capacitor bank). The rep rate parameter is the pulses per second
between flashlamp firings. Pulse division is the parameter that deter-
mines at what fraction of the rep rate the Q-switch operates. For example:
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