Star Tech Journal

STAR*TEcH
Journal
May 1996
CID
WILLIAMS JOHNNY MNEMONIC
BLOWING FUSES INTERMITIENilY
Williams Parts & Service
Williams Games
Chicago, Illinois
SYMPTOM
Hand magnet causing fuse to
blow intermittently.
SOLUTION
This procedure will move the
hand electromagnet power sup-
ply circuit from fuse Fl04 to fuse
F103, which is not used by any
other circuit in the game. These
fuses are located on the Power
Driver Board Assembly.
PROCEDURE
1. Remove the balls from the
game and disconnect the power.
2. Raise the playfield and lean it
against the backbox.
3. Locate the 6-pin connector
containing two red/brown 18 ga.
DIAGRAM A
wires in the same pin, two red/
white wires in the same pin, one
blue/yellow wire in its own pin,
and one purple/blue wire in its
own pin. This connector comes
off the back panel assembly and
is located at the back of the
.
playfield.
4. Cut the paired red/brown
wires on the side of the connec-
tor going away from the playfield
and towards the backbox as
shown in DIAGRAM A.
5. Splice the wires as shown in
DIAGRAM B.
6. Cut an 8 ft. length of 18 ga.
wire and splice into the wire end
left at the connector. Run the
other end into the backbox and
press the wire end into position
no. 1 at the insulation displace-
ment connector J 107, located on
the Power Driver Board Assem-
bly. NOTE: IT IS VERY IM-
PORTANT THAT GOOD
ELECTRICAL CONTACT IS
MADE AT THE IDC 0107)
WHEN INSTALLING THE 18
GA. WIRE!
7. Replace the fuse at position
F103 with a 4 amp slow blow A
250v fuse.
W
8. Dress the new 18 ga. jumper
wire inside the black corrugated
cable tube at the right side of the
backbox. Wire tie as needed at
the playfield, making sure to stay
clear of all moving mechanisms.
Route the jumper inside the
backbox as needed.
DIAGRAM B