STAR*TECH JOURNAL/OCTOBER 1982
18
A Regular Monthly Feature Technically Outlining a Newly Released Game
TAITO'S JUNGLE KING
By Joe Connor, Active Amusement, Philadelphia, PA
Transformer - The AC input voltage is applied to a
single transformer via the line filter, on/off and interlock
switches. Different line cords are used for 120v or for
240v operation. There are 5 secondary windings which
provide all necessary AC voltages. A voltage programming
block is located on the primary side of the transformer to
compensate for low or high line voltages.
Power Supply - The game power supply was designed
for numerous applications. It can provide 4 regulated DC
voltages (+5, +12, -12, and -5) as well as the system
reset signal. The only voltages necessary to operate the
"Jungle King" board system, however, are +5 and +12
volts. Both of these regulator circuits are essentially the
same, employing a UA 723 regulator which controls the
gain of a series pass transistor in a standard fold-back
current limiting circuit design. These circuits provide + 5
volts at 7 amps and + I 2 volts at 4 amps with each one
protected by an SCR-type "crowbar" circuit. The +5
volts will "crowbar" at any voltage above 5 .8 and the+ I 2
volts will act likewise at any voltage above 13.
Voltage Adjustments- Voltage indicator LEDs are
present on the power supply but, as always, a meter
should be used to verify proper voltages. Both the +5 and
+ 12 volts have voltage (RI 6, R28) and current limiting
adjustment pots located on the power supply. These pots
are factory sealed and usually no adjustment should be
necessary. However, should any adjustment be needed,
there are instructions located in the "Jungle King" game
manual for the proper method of calibrating these pots.
Generally the current limiting pots (RI&, R25) are set at
about 11 o'clock. It seems that at this position, adjusting
the +5 and+ 12 voltage pots provides optimum operating
conditions.
Based on early collections, "Jungle King", the latest
game from Tai to, has the potential to be the strongest new
piece of the fall season. Game play is based on a hero
(Tarzan?) maneuvering through a jungle of vines, swim-
ming across a crocodile-infested river, running over
and under boulders to rescue a kidnapped princess.
Electronically this game possesses Taito's recently
developed "Japanese Board System". This is the system
that doesn't print up on the monitor "Memory Failure '
Open Coin Door". That was the system used on "Qix",
"Kram", "Space Dungeon", and "Electronic Yo Yo".
This new system has appeared in two earlier games:
"Alpine Ski" and "Wild Western". Neither of these
games had much commercial success, hence very few
technicians are familiar with this new system. The simi-
larities in these three games include the transformer and
power supply assemblies, standard Wells-Gardner color
monitor, and a 3-board logic set which is identical in all
three games but for the program RO Ms and a few jumpers.
Taito has encountered very few problems with either
"Alpine Ski" or"Wild Western". Therefore, they decided
to stick with it and use this same system for " Jungle
King", a game which will probably be a good indicator
(large sales) of exactly how good (reliable) this system is.
System Power
The system power ( see Diagram I) distribution is very
basic and should be quite familiar to most technicians as it
employs Taito's universal transformer and power supply
assembly, which was first used on "Qix" and has been
found on all games since then ("Kram", "Electronic Yo
Yo", "Space Dungeon", "Alpine Ski", etc.)
Notes
• -5 volts is unused but is wired from power supply to filter
board.
1. On/Off switch located in the front of the game at the
bottom left side of cabinet.
2. TWO interlocks, one on coin door, one on back door.
3. There are NO fluorescent tubes, marquee lighting is
accomplished using (7) #4 7 bulbs.
4. Varistor across input to line filter is V150LA 1 OA
(domestic)
Diagram 1 System Power
120vac isolated ---------------------;,,)l'--_M_o_n-it-or _ __,
f----
6.3vac - - - - - - - - - - - - - - - - - ,
Marquee
On/Off
Switch
+
l
Line
Voltage
17vac
H
Line
Filter
+12vdc
Coin Ooor
Power
Supply
r
+
17vac
Heat Sink
Assembly
Interlock
Switches (2)
Service
Outlet
+5vdc
Instruction
Panel
Lighting
1----
-5vdc•
12vac
Logic Bds.
-------------------1~~----------------
Location
Line cord bracket
Pwr. Sup. bracket
Pwr. Sup. bracket
Pwr. Sup. PCB (F1)
111111
3 amp SB
2 amp SB
2.5 amp SB
10 amp
Circuit
Line in A.C.
Isolated A.C. (monitor)
Incandescent lights
BR1
Locatlon
Pwr. Sup. PCB (F2)
Pwr. Sup. PCB (F3)
Pwr. Sup. PCB (F4)
Pwr. Sup. PCB (F5)
Value
10 amp
2 amp
4 amp
4 amp
Circuit
BR2
BR3
+5vdc out
+5vdc out