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STAR*TECH JOURNAL/SEPTEMBER 1982
SERVICE 'llPS:
* SEEBURG
PHONOS * ATARI "TEMPEST"
* NINTENDO
"DONKEY KONG"
Service Dept., Lieberman Music Co., Minneapolis, MN
Seaburg Phonographs
System: LPCl to STD4
Symptom: Runs slow or wow
Solution:
1. Remove motor shaft worm gear bearing assembly (TOWER).
Disassemble lock nut, set screw and ball bearing. Clean thoroughly,
oil and reassemble. Install bearing, set screw, and lock nut. Tighten to
snug, then back off one quarter(¼) turn.
2. Remove end thrust plate bearing. Clean thoroughly, oil and inspect
bearing for flatness. Replace ifnecessary. Reassemble and adjust end
play for .003 to .007 .
Worm Gear Bearing Size .250
Thrust Bearing Size .187
System: LS3 to STD4
Service Hint: Clean edges of circuit boards on both Black and Grey
boxes. Raise contacts on connector housings. You'll save a lot of service
calls.
The Rush Fyberglass Eraser Pen works well for cleaning circuit
board edges.
ATARI
"DIG DUG" CREDIT MOD
Problem: Four credits for one coin.
Solution: Do the following modification (for early PCBs only). There
are two ways you can tell apart old and new PCBs:
1. Older PCBs are marked as part no. A038156, and newer PCBs are
part no. A038575 .
2. Early PCBs have large 40-pin chips located near their centers. Newer
PCBs have these chips along one edge, away from the edge connector.
Modification:
1. Cut trace between pins 18 and 19 of LS3 77, located at 4D ( see
illustration).
2. Jumper pin 1 of74S04 at location 3A to the feed-through, as shown.
3. Jumper pin 2 of 7 4S04 ( at location 3A) to feed-through between pins
1 and 42 of the custom integrated circuit at location 1 /2C ( see
illustration).
Note: Mod inverts the signal I/O2H• (IOEN) to custom chip 53
(1/2C) and custom chip 51 (1/2E).
0
System: LS3 to STD4
Symptom: Blowing fuse in Control Center F3102 (-27v)
Solution: Unplug both Grey and Black boxes, and power up. Fuse
doesn't blow? Problem is probably a 33v Zener in either one. Plug in
each, one at a time, to determine faulty unit. Black box location
CR3742, CR3744. Grey box location CR3228. Use 1N4752 as
replacement.
Atari "Tempest" Owners
1. When you begin to have complaints of the picture developing jitters,
remove the high voltage cage and change C901 and C902. These are
electrolytic capacitors with a value of 100 'mf 35 volts. Be sure to
reinstall these properly.
2. There is an overvoltage protection board available for "Tempest".
It's well worth your investment.
3. The C503 (33 mfd 250 volt), if open, shorted, or cold soldered, will
cause the 5 amp fuses to open. These capacitors are located on the PC
Board which attaches to the neck of the tube.
Nintendo "Donkey Kong" Owners
The E.C.L. (Emitter Coupled Logic) is highly sensitive to voltage
changes and, when under the influence of erratic power supply systems,
will produce lines, double characters, etc., on the screen. The 4-board set
draws a lot of current on both the +5 and -5 (better than 4 amps). Before
you request exchange boards, make sure your power supply is operating
properly.
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EXIDY
"VICTORY'' TO "VICTOR BANANA"
MODIFICATION KIT
After the tremendous acceptance of"Venture" to " Pepper II" Modifica-
tion Kits, Exidy now has another offer: The "Victory" to "Victor
Banana" Modification Kit. Operators may convert their "Victory"
games to "Victor Banana". What's "Victor Banana" ? A zany new space
game, filled with imaginative new characters. "Victor Banana" has
tested extremely successfully in many locations.
Available through distributors for the suggested retail price of $450,
operators should send in boards for modification. Exidy is doing all they
can to keep profits mounting on ALL Exidy games. Interested operators
should see their distributor for more details, or contact Exidy, 390 Java
Drive, Sunnyvale, CA 94086. Phone: 408/734-9410.
Star*Tech Journal, Volume 4, Number 7, September 1982. Copyright 1982 by Star*Tech Journal, Inc. All rights reserved. Star*Tech Journal is published 12 limes a year.
Address inquiries to: P.O. Box 1065, Merchantville, New Jersey 08109. Phone: 609-662·3432. Star*Tech Journal verifies the contents of the articles herein as much as
possible. However, any reader using this information does so at his/her own risk. Star*Tech Journal accepts no responsibilities for its advertisers' activities. Subscription
rates: U.S.A. - $32.00. Canada - $36.00. Other Countries - $56.00. Please remit payment In U.S. Funds. Advertising rates available upon request. Staff: Publisher/Editor:·
James Calore. Administrative Assistant: LT. Di Renzo. Art/Advertising Coordinator: Paul Ehllnger. Circulation Promotion: Linda Geseking. Contributing Technical Writers:
Todd Erickson, Joe Connor.