Star Tech Journal

Issue: 1989-March - Vol 11 Issue 1

Sega Controls Maintenance Program
James Beck
Greater Southern Distributing Co.
Atlanta, Georgia
1. You've obviously owned the game for some-
time now, and you undoubtedly keep track of
the money income, so anticipate problems
BEFORE they occur. You don't wait until your
car throws a rod or wastes a bearing before you
replace the oil doyou?No, you keep track of the
mileage and replace the oil when before it
becomes a problem.
Well, consider the coin meter an odometer and
set up a regular cable replacement schedule
based on the data you collect from past failures
(i.e. the average number of coins before a failure
occurs). That might seem a little extreme, but
not when it comes down to the difference be-
tween having the game up for the weekend in
addition to having to send someone to that
specific location to repair the game. The cost of
the extra cables could easily be recouped.
2. Pre-lubricate the cables before putting them
on. Devices to do this can be found at nearly
every motorcycle shop, and they are very easy to
use. I recommend using "TEFWN" or a graph-
ite-based lubricant. That will definitely increase
the life of the cable.
GOOD NEWS/BAD NEWS
The bottom line is the bottom line. The game must
make money or you wouldn't keep it in the field, in
other words the controls wouldn't fail if the game
wasn't being played regularly. That's the good news.
The bad news is, yes, the controls can be a bitch to
keep up, but with care you can help keep the main-
tenance costs from eating up your bottom (line).
3. Avoid sharp angles when mounting the cables
to the handlebar assembly. After installation let
the cable rest naturally then pull it into place
and install the hold downs.
4. Tighten ALL nuts, bolts, and screws. A kid
pulling on a loose bolt etc. will tum that 1 /32 of
an inch play into a broken joint or a welled-out
hole in no time.
5. Lubricate everything that moves. You can find
the recommended lubrication points in your
owners manual, and use grease if possible. Oil
just gets slung around and can cause other
problems.
6. To avoid premature pot failure, adjust the
cables properly so that no pot hits the end of its
travel, and keep grease and oil away from the
pot's shaft and body. If you give the pot a little
coating of spray epoxy before installation it will
seal all of the seams and keep excess moisture
and oil out making it last longer.
SEND 'EM TO THE FIELD
Hopefully in the future the design engineers will take
us poor people in the field into mind before they flnis1l-,.
up a design, but until then do what must be done '
Maybe if the design engineers were required to do the
field repairs on their units, that were tested in the
field, they would have a different attitude!
Leland Coin Input
Ckt Clarification
Douglas E. Totty
The Leland Corporation
El Cajon, California
This note is to clarify some misinformation delivered
in the article entitled "Leland Coin Input Circuit" by
James Beck which appears on page 15 of the Janu-
ary, 1989 issue of STAR*1ECH Joumal.
Seeburg CD Inter-
Dlittent Proble111s
Chuck Green
Snodgrass Sales
Terra Haute, Indiana
PROBLEMS
Well, after much research, and some help from
Seeburg, I have finally solved the problem of songs
being cut off, songs not playing and credit problems
on the Seeburg CD jukebox.
CLARIFYING DESCRIPTION
We do rwt use the /NMI input of the master Z80
processor as the means by which we count coins and
generate credits. An /NMI is only generated with the
first depression of the service switch or the first coin
drop through either of the two coin mechs. All subse-
quent /NMI's fail to reach the master processor
because Ul 15 is never reset.
ACTUAL CAUSE
~Coins are read by polling an input port (25) times
ivery VBLANKG and reading a specific bit. When a
coin switch gets stuck closed, the program goes into
a continuous polling loop. This is the official reason
for a game freeze-up Oust to keep the record straight).
·.-:-::::::::::;:::::::::::::::::::::::::::::::;:::::::::::::::::;:::::::::•:::::::::;:::::::::::::::::::::;:::::::::::::::::::;:::::::::::::::::::::;:;:;:;:;:;:::::::;:;:;:;:;:;:;:;:;:::::::::::::::::::::::;:;:;:;:;:;:;:;:;:;:;:;:::;:::;:;::::,:-,•.
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REMOTES
First of all, get rid of the wireless remote. They are
junk. In most locations you have got neon signs that
create lots of interference. Especially the ones that
flicker. The range of the remote is VERY short. In
some locations it would not work across the room!
Wired remotes are available from Seeburg.
PROGRAM UPDATE
Program update R3/R5, U3/U5 solves the problem of
songs being cut off. That bug has been alive for years.
INTERMITTENT$
To solve the intermittent problems: credits, the songs
being cut off and songs not being played: Take your
updated program and read it into a Epromreader and
copy it to a GOOD Eprom. The brand of Eproms that
Seeburg uses we had problems with -BUT the pro-
gram was just fine. We had an L5 that was cutting
every song off. So we replaced it with another L5 and
it worked fine. Took the suspect L5 and put it in a good
box and it cut every song off. I then read the good L5
and the bad L5 and the programs were the same!
So I copied the L5 into known good Eproms and
updated our boxes. That cured a lot of problems. The
difference between R5 & U5 is that a minor bug was
fixed on the playmaker stimulator. I have used R5 on
a box (that is played a lot) for a month now and so far,
no errors. (Cross my fingers!) Be sure that when you
update the box that you check the pricing. R5 factory
default is 3 for a dollar but can be set to 5 for a dollar.

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