March 1986 [2)
STAR*TECH Journal
Figure (1) shows the noise on the hit line
(blue wire) that results from noise on the
5 volt power line (yellow wire). This
noise is present without p:>inting the gun
towards the screen, and should be a steady
5 volts.
Nintendo DlJA4/0NI-SYS'IEM Gm Ganes
By Nintendo Service Department
Redrrond' WA
The factory has been made aware that there
is a problem with noise on the 5 volt line
that powers the gun. Generally this
problem has only shown up in the cocktail
tables, although it is p:>ssible that this
problem could surface in an upright model.
Figure (2) shows how the signal on the hit
line (blue wire) should look when the gun
is p:>inted toward the screen. To achieve
this clean signal and a steady 5 volt
signal when gun is not p:>inted towards the
screen, please add the modification to the
15 Pin Gun Harness shown in Figure (3) and
as described below.
The result of this noise on the p:>wer line
shows up in various forms as listed below:
1) Screen not flashing (white square) when
trigger is pulled.
2) During game play, hits are registered
on targets not being aimed at.
3) Game may be started without pointing
gun at screen.
Connect (+) side of lOOOuf capacitor to
yellow power wire. Connect the (-) side to
the green p:>wer ground wire. Also, from
the (-) side of the cap, run a piece of
wire about 18 inches in length with a ring
terminal on the end. This should be
attached to one of the carriage bolts that
holds the cable clanp to the control panel
as shown in Figure (4).
To remedy this problem, a lOOOuf capacitor
has been added to the 5 volt jumper
harness to reduce p:>wer supply noise, as
shown in the accompanying figures.
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Figure (1)
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Figure (2)
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2ms 1 V
WHIT!
BLUE
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MAIN HARNESS
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MODIFICATION
Figure (3)
HOLSTER
Figure (4)