Star Tech Journal
Issue: 1994-March - Vol 16 Issue 1 - Page 5
March 1994
...;.._"'TAR TECH JOURNAL
DATA EAST
BALLY TWILIGHT
REDEMPTION
JURASSIC PARK
ZONE HARNESS
GAME METER
LOCK-UP
PROBLEM
Aoo-ON
Chad Martens
Action Amusements
Appleton, Wisconsin
Robert Gill
Castle Golf Family Fun Park
Prescott Valley, Arizona
Vic Fortenbach
Vicco Electronics
Cathedral City, California
SYMPTOMS
SUBJECT
SUBJECT
I have recently encountered two
Data East's Jurassic Park pinballs
with the same problem. They
have been intermittently locking
up, resetting, and the display
blanking out.
I have a problem with the Trough
Proximity switch and I have seen
others with this same problem. ( 4
of 4!) As a pin player, I can say
that it is important for this sen-
sor to work right for proper game
play.
Adding a mechanical meter to a
redemption game.
CAUSE
After close inspection, I found
that CN-2 on the sound board (lo-
cated in the bottom right hand
,orner of the backbox) had bad
solder joints.
SOLUTION
I have resoldered CN-2 on both
pins and the problem has disap-
peared. To check, wiggle CN-2
and the display will blank out,
and the game will reset. Resolder
and you done.
I.Aw
#1601
MuRPHY's
A good plan
today
is better than a
perfect plan
tomorrow.
SYMPTOM
Right after receiving our T-Zone,
the Trough Proximity sensor
failed. The 2-wire harness that
connects the Trough Coil Assy
(P# A-16528) with the Proximity
Opto Sensor Assy (P# A-16534)
has a 3-pin plug on each end to
connect these boards. I could
wiggle the plug on the Proximity
Opto Sensor Assy and the prob-
lem was temporarily cured.
Fix
But after 3 days of this, I decided
something was wrong with the
plug. I resoldered the pins on the
board and R&R'ed the wires on
the plug. Finally, as a last resort,
I eliminated it -I soldered the
wires directly to the board!
All was well for about 2 weeks.
Then the plug on the Trough Coil
Assy went bad. I eliminated it
also, and the proximity sensor has
worked ever since!
~ ~ ~
PROCEDURE
I have used a 5 volt coin meter
(Durant style .n.Q1 the big metal
ones) connected to the notch out-
put on a Deltronics DL-1275
ticket dispenser.
MODIFlCATION
Change the notch transistor to a
TIP 120 (it's a weak 2N2222) and
connect the other meter wire to
+12Vdc.
THEORY
Since the notch duration is so
short, the actual voltage going to
the meter is about 5.8 volts when
connected to the 12 volt power
supply.
CAUfION
Be sure to use a diode across the
meter (1N4001, 1N4002, etc.) for
spike protection.
If wiggling these plugs cause the
problem to come and go, I sug-
gest you ELIMINATE THE
PLUGS! Just solder the 2-wire
harness directly to the boards at
both ends.
------------------5-----------------
...;.._"'TAR TECH JOURNAL
DATA EAST
BALLY TWILIGHT
REDEMPTION
JURASSIC PARK
ZONE HARNESS
GAME METER
LOCK-UP
PROBLEM
Aoo-ON
Chad Martens
Action Amusements
Appleton, Wisconsin
Robert Gill
Castle Golf Family Fun Park
Prescott Valley, Arizona
Vic Fortenbach
Vicco Electronics
Cathedral City, California
SYMPTOMS
SUBJECT
SUBJECT
I have recently encountered two
Data East's Jurassic Park pinballs
with the same problem. They
have been intermittently locking
up, resetting, and the display
blanking out.
I have a problem with the Trough
Proximity switch and I have seen
others with this same problem. ( 4
of 4!) As a pin player, I can say
that it is important for this sen-
sor to work right for proper game
play.
Adding a mechanical meter to a
redemption game.
CAUSE
After close inspection, I found
that CN-2 on the sound board (lo-
cated in the bottom right hand
,orner of the backbox) had bad
solder joints.
SOLUTION
I have resoldered CN-2 on both
pins and the problem has disap-
peared. To check, wiggle CN-2
and the display will blank out,
and the game will reset. Resolder
and you done.
I.Aw
#1601
MuRPHY's
A good plan
today
is better than a
perfect plan
tomorrow.
SYMPTOM
Right after receiving our T-Zone,
the Trough Proximity sensor
failed. The 2-wire harness that
connects the Trough Coil Assy
(P# A-16528) with the Proximity
Opto Sensor Assy (P# A-16534)
has a 3-pin plug on each end to
connect these boards. I could
wiggle the plug on the Proximity
Opto Sensor Assy and the prob-
lem was temporarily cured.
Fix
But after 3 days of this, I decided
something was wrong with the
plug. I resoldered the pins on the
board and R&R'ed the wires on
the plug. Finally, as a last resort,
I eliminated it -I soldered the
wires directly to the board!
All was well for about 2 weeks.
Then the plug on the Trough Coil
Assy went bad. I eliminated it
also, and the proximity sensor has
worked ever since!
~ ~ ~
PROCEDURE
I have used a 5 volt coin meter
(Durant style .n.Q1 the big metal
ones) connected to the notch out-
put on a Deltronics DL-1275
ticket dispenser.
MODIFlCATION
Change the notch transistor to a
TIP 120 (it's a weak 2N2222) and
connect the other meter wire to
+12Vdc.
THEORY
Since the notch duration is so
short, the actual voltage going to
the meter is about 5.8 volts when
connected to the 12 volt power
supply.
CAUfION
Be sure to use a diode across the
meter (1N4001, 1N4002, etc.) for
spike protection.
If wiggling these plugs cause the
problem to come and go, I sug-
gest you ELIMINATE THE
PLUGS! Just solder the 2-wire
harness directly to the boards at
both ends.
------------------5-----------------
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