Star Tech Journal

Issue: 1991-March - Vol 13 Issue 1

Prince's Corner
Donald B. Prince
D&RMusic
Bozeman, Montana
Cutting Your Troubleshooting Tinie
With The IC Pinout Guide
SUBJECT
I recently came across a great troubleshooting
aid. It's called the IC Pinout Guide by Globe
Engineering.
Each IC number lists the manufacturer, a de-
scription, packaging information, and where to
find the pin-out.
J
The IC Pinout Guide (IPG from now on) can save
you a third, or even hal.f the time it takes to look
up pin-outs in manufacturer data books. This
can save you much needed time and money
when you have one of the following problems:
The pin-out section lists the IC's in order to pin-
count and then sequence number, for example
20-5871 means a pin-count of 20 nd a se-
quential number of 5871. The packaging infor-
mation shows physical characteristics, pin ori-
entation, and includes surface mounted devices
1) Schematics with omitted pinouts
2) You're not sure of the function of an IC
3) You don't have any schematics
4) You need a manufacturer source for an IC
(SMD's).
The IPG has over 175,000 IC's with complete
pinouts. packaging and pin orientation. and
function description. It includes all kinds ofIC's:
The manufacturer directory lists 400 world wide
IC manufacturers with their logo's, manufac-
turer abbreviation. address, telephone, FAX
number, and their device numbering system.
This section is extremely helpful in itself.
OpAmps
Processors
MemDry
Peripherals
Buffers
Line Drivers
PROMs
Digital Logic
EAsv To UsE
The IGP is really easy to use. It's broken down
into four parts: (1) the part number locator. (2)
the package and pin orientation, (3) pinouts,
and (4) manufacturer directory.
All the sections are color coded for quick ref er-
encing. The part number locator lists the I C's by
generic number (for example 7 4LS244) and by
manufacturer root (for example M74LS244P).
SOURCE INFO
IPG won't take long to pay for itself with all that
information packed into one book. It's also risk
free since it has a 30 day money back guarantee.
If you have bought any data books lately, you can
see $99.00 for all that information is a good
price. Call Global Engineering at 800/854-7179
for ordering information.
Data East Simpsons Lost Balls
& Other Pin Tips
Losr BALLS
GREEN
Yes, the ball gets stuck in several places. Two so
far that I've found (and probably a dozen more
that I haven't!). Naturally, the solution to most
dead spots is the proper pitch on the table (see
the Quick& Dirty Inclinometer in the April, 1990
issue of S,tTJ). If that doesn't help, then we have
to resort to field modifications.
This mod is easier. Using a pair of channel lock
pliers, bend the inboard rail down slightly and
the outboard rail up slightly. This directs the ball
down into the plastic channel and prevents the
upper saucer from kicking the ball straight to the
dead spot. Also, bending the outboard rail in
slightly will help too.
I see the spot that was referred to in the January,
1991 issueofS::JtTJandagreethatthedesigners
did goof a little, but where they goofed alot is on
both the yellow AND the green ramps. Let's take
them one at a time.
YELLOW RAMP
It has happened a number of times, that the ball
will jump on top of this ramp (down by the kicker
area) and get stuck between the ramp and the
glass.
Fax
The solution is easy. Use a hacksaw and cut out
the Inboard Rail (top rail only) approximately 1 /
4" from the metal hoop supports (see Figure 1).
This does not adversely affect the looks of the
game, and does reduce service calls. Be sure to
clean up the cuttings when done, it will ruin the
table finish otherwise.
YELLOW
GREEN RAMP
Again, we have had numerous service calls on
the ball getting stuck on top of the plastic by the
lower red "Bart Lamp" (see Figure 1).
OPTO
Fax
PACKING
~
While we're on the subject of pinball, here's
another tip. Space the opto coupler approxi-
mately 1 /32" from the board. Solder it down and
then apply the silicone around the base. I use a
match stick for this, so I can "pack" a little under
the edge of the opto coupler. So far I've only had
to replace one that was done like this and it was
a bad coupler, not a mechanical failure.
As for the E-clips, if it's really an annoyance, you
can thread the ends of the studs (6-32, 8-32 or
whatever it takes) and try using an aircraft (self
locking nylon insert) nut. I haven't tried this
personally, but I have seen it done once. This
should help
ADD TO THE "STICKY FLIPPER CHECKLIST"
Clean the insert and plunger with TFE or an-
other spray solvent and wipe clean and dry. Any
oils present will be cooked into a gum that slows
them down and may present a fire hazard if
sufficient heat builds up in the coil assembly. In
fact, it would be nice if the manufacturers would~
put that on the mech diagrams in the manuals.
How about it, guys?

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