Creative Engineering ROCK-A-FIRE EXPLOSION - Page 252

Once you have established that the Long Driver Board is good
then move on to the light box, see chart - pages 5-067 and 5-081,
also 5-074. Determine exactly which bit is the one to control the
light and find the corresponding number in the light box and the
Light Module board that controls it. ( Be careful not to touch or
brush up against the A. C. voltage). Jumper the red terminal #3
to a good ground to be located on the chassis or box. You should
read 25 volts on that test point. If you do not have that voltage
on the CEI 1 Board, then the cable is possibly bad, exchange it
for another cable. If that is the problem then repair or replace
it.
On the inside left hand side of the light box, find the
correct terminal in the white set of terminals and jumper this
terminal with the matching one in the yellow set of terminals.
(Be extremely careful -- Be sure the jumper is insulated • DO NOT
TOUCH the exposed lead, bare wire or terminal. This is live A. C.
110 volts! ) If that turns the light on, then replace the CEI 1
board and triac with one of the spare ones at the bottom right
hand corner of the box. Be sure you shut off the whole box before
you replace the Module.
CC Panel 8 Triac or 20 Triac Boxes )
Take a reading on the 110 volt A.C. line to see if you have
the power to the box. You can read the voltage with a probe at
the negative lead at the 1000 mfd. cap. on the power supply. The
positive side can be read from the black wire of the A.C. input.
Caution, live 110 volts in the Triac box. See the circuit layout
drawing for 8 or 20 Triac Driver boxes of detailed information,
see pages 5-065 and 5-071.
Houselight Problems
Check the override switch and see if it has been switched to
override by mistake. If so, return it to the correct position.
Verify the background music mute by hitting a manual stop and then
play again and see it the background music turns off and on
correctly. If the background music mutes, but the lights do not
dim, then replace Q3. If the background music doesn't mute then
replace the Show Control Board.
A.C. Monitor - Check the A. C. Monitor output on pin #5. You
should read 12.5v. A. C. at 120hz. with a positive going pulse
waveform, see pages 5-063 and 5-064, also 5-068 and 5-076. If you
do not have this, then trace the A. c. signal back through the
Dual P. C. Mount, cable and Tunnel, and out the rear of the
cabinet. Unplug the molex cable from the J13 Interface at the
rear of the cabinet, ( red and white wire), and check for A. c.
voltage, on the cable. Next, unplug the same cable at the A. C.
monitor box and check the output of the monitor, see schematics
and drawings on pages 5-063 and 5-064, also 5-068 and 5-076.
Houselight Dimmer Board - If the Houselights are in the dim
position try to adjust the 'Pots' on the board see schematic, page
5-063 and 5-064. Set VR2 counter-clockwise all the way and VR3.
counter-clockwise all the way. Set VRl to minimum light level