Star Tech Journal

Issue: 1987-June - Vol 9 Issue 4

June 1987 (5)
STAR*TECH Journal
VA+
Exidy TOP SECRET Power Mod
By Exidy Customer Service
Fremont, california
IM741 Power Re-Direction fvk>d.
Following is our specifications for
CROSSBCM--type audio board modifications.
'Ibis modification will reduce comµ:ment
stresses and provide for better
reliability.
'Ibis change should be made on '!OP SOCRET
games purchased before March 1, 1987. ('!OP
SOCREI' games sold after this date have
already been modified.)
-
VA-
It is also being recommended for CROOSBCW,
CHEYENNE, ~CKSHOT, CA'ICH-22, CHIU..ER,
and CLAY PIGEON. Al though these GUN games
will function fine without the rood, it is
recornmended as a preventative rreasure and
will increase long term reliability.
TOCHNICAL DFSCRIPI'ION:
'lbe supply voltage to the LM741 is being
redirected from +18V/-18V to +12V/-12V,
also a current limiting resistor has been
added. (See circuit diagrams.)
E:'1.1S1"1N6
Williams Pins Power Supply
Low+SVdc
Vflt
+33,,_f
~
r
Sam Cross
Godwin Distributing Co.
North Little Rock, Arkansas
PROBLEM:
ool
'-'..f
VA-
By
3Jf.tf
A
PRCX:EDURE:

A 1k ohm, 1/ 4 watt resistor is added to
the base circuit of Qll and Ql2. Also, the
supply voltage is switched from +/-18v to
+/- 12v.
Low
+SVOC
POSSIBLE CAUSE: 'lbe reason for this
service note is that this component may be
overlooked in trying to find the cause.
CB, a 47 microfarad at SOVOC capacitor may
have opened up.
I encountered this problem shortly after I
was told about it at the A01E show in New
Orleans this past March. I have
encountered this cap as being the problem
only once before, but other technicians
seem to have encountered this cap as being
resµ:>nsible for low +SVOC several times
in the past.
June 1987 (6)
STAR*TECH Journal
Ardac MBA BIii Acceptor Harness
Strain Relief Caution
By
Stan Gossard
Ardac Incorporated
Eastlake, Ohio
our internal quality assurance has
isolated a potential problem with MBA.
acceptor harnesses manufactured and
shipped from March 18th through April
14th, 1987.
IDENI'IFIC.ATION
Systems having serial nunbers of 03701184
through 04702639 are suspect.
'Ibis is the MBA. system harness that goes
between the bill acceptor and the control
box.
PROBLEM
In MBA. system acceptor harnesses
manufactured during the period nentioned
above, the staking of the terminals to the
wires resulted in good electrical
connections, but in soire cases, the wire
does not have adequate strain relief.
'lbe problem could becoire apparent through
handling. Because of the inadequate strain
relief, it is possible that a wire may
pull out of its terminal men atterrpting
to disconnect the acceptor harness from
the control box.
Merit Counter-top Games
+12Vdc Supply
By
Sam Cross
Godwin Distributing Co.
North Little Rock, Arkansas
PROBLEM: I have fixed many of these garnes
with the same problem. It roost always
shows up in the +12vdc either rising too
high or dropping too low.
SYMiavl.S: If it drops low, intermittently
the game will reset.
If too high it can cause board damage.
FIX: '!he solution is to replace the 7812
regulator in the supply and resolder the
burnt connections around, and associated
with, the 7812 or complete replacenent of
the supply.
Wl'E: At the sarne tiire it is good to check
to see if the ventilation fan is clear of
excessive dirt accumulation and is
working, as a good deal of heat is
generated in this small cabinet.
CRANE MERCHANDISE
~TION
We recormend that these bill acceptor
harnesses be replaced if the MBA. systems
in stock are easily accessible. A recall
of bill acceptor harnesses installed in
working vendors is not required.
aJRRENI' ~ESSES MARKED
In order to avoid confusing current
production bill acceptor harnesses with
previously manufactured harnesses, we are
placing a blue mark on the control box end
of the acceptor harness.
Please clearly mark any returns of suspect
acceptor harnesses as "defective."
AVAIIABILITY
Irmrediate shiµnents of known good
harnesses are available. Please contact
Sharon Taylor or key Mastalski (Sales
Departnent) 216/946-3000.
prfzes,
DIFFERENT • UNIQUE • EXCITING
IMMEDIATE DELIVERY
Call Toll Free:
(800) 992-2388, (800) 992-6577 (in California)
1590 Sunland Lane, Costa Mesa, CA 92626

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