21
STAR*TECH JOURNAL/APRIL 1983
Problem #1
INPUT LOGIC STATE
A
----➔ OUT
B 0--------====--....J
C
D
E
A
B
C
D
E
F
1
0
1
0
0
0
F
Now for the technicians out there who like to build circuits: I have
another "Building Block" circuit The Quad NANO #4011 is more
versatile than its TTL counterpart (the #7400 IC). You, of course, can
~e it for standard NAND gate logic functions such as a control gate,
mverters, etc., but due to the high impedance input you can produce
current drivers such as ...
3
o- - - - OUT
This month's technical review has been submitted to me by Peter Gurko,
the chief technician for Kiddie Rides USA in Davenport, Iowa. Peter is
helping me fill my column this month and next ( as ifl didn't talk enough!)
He will be contributing periodically on kiddie rides, hydraulic pumps,
motors, valves, etc. I thing you'll enjoy ... so here's Peter.
Gino Rondlna "Scoutball" Troubleshooting Tips for
Dlrectlonal Movement Failures
By Peter Gurko. Artwork by Mike Mier.
Kiddie Rides USA, Davenport, IA
an inverter! And it's OK to add more gates to this function!
The same goes for the 4001 Quad NOR gate. It has more
applications than its TTL counterpart, the 7402. If you're building a
circuit that requires an RS latch, but you don't want to use a whole 4044
IC ( quad RS latch) and you have a 4001 or other NOR gate IC with two
gates free, this is how you would hook up the circuit:
When a lever control switch of the "Scoutball" is depressed, a relay is
energized on the relay board located under the motor cover. This in turn
supplies 12v to the electrovalve. The EMF of the coil surrounding the
spool valve pushes the spool forward, which makes contact with the
piston and changes the position of the piston across the channels of the
electrovalve plate. Ride movement will occur with respect to the
channels opened/closed. If loss of movement occurs, a few simple
troubleshooting procedures will isolate the problem.
I. Remove the motor cover, initiate play, and manually override the
electrovalve. This is accomplished by pressing a finger, the end of a
screw driver, or the handle of a ratchet against the rear of the spool
valve, forcing it against the piston. If movement occurs, the electro-
valve is sound. If the spool valve resists the pressure applied, it needs
to be disassembled, cleaned, and reassembled.
2. Check for voltage at the actuator plug of the electrovalve. 12v should
be present for normal operation.
3. Check switches and wires for continuity to the relay socket
4. Check socket inserts for stability and relay for contact potential.
5. Check relay to electrovalve wires for continuity.
A
BOTTOM VIEW
0
0
(Q)
RETURN
0
0
DOWN
UP
(Q)
INTAKE
0
0
12v---..._....._
j
_,,_--12v
B
r
7
C
D
PISTON
The answer to Problem # 1 is 1 or High. Next issue we get tougher. If you have an idea on
how to improve a non-video arcade piece, call me at 714/661-6808. Until then ... "Bear''.