Star Tech Journal

Issue: 1988-April - Vol 10 Issue 2

STAR*TECH Journal
3
April 1988
WANTED: Dead or Ahve
USED P .C. BOARDS!
P.O. Box 1065
18 North Centre Street
Merchantville, NJ 08 l 09
Phone: 609/662-1080
FAX:
609/488-9326
Modem: 404/631-2928
Publisher /Editor:
Office Manager:
Contributors:
James Calore
Sharon DiRenzo
Arnie Aarstad
James Beck
Dave Cantrell
John Coccioletti
Sam Cross
Jim Ennis
Mike Jones
John Robertson
Mohamed Salem
Frank Seninsky
Neal Zook
STAR*TECH Journal, April 1988, Volume 10, Number 2,
Copyright ©1988 by Star Tech Journal. Inc. All rights
reserved. Address inquiries to: PO Box l 065. Mer-
chantville, NJ 08109. Phone: 609/662-1080. Subscrip-
tion rates: USA $56.00. Canada $63.00 (US funds) .
Other Countries $98.00 Air Mail (US funds) .
POSTMASTER: Send address changes to ST AR* TECH
Journal, PO Box 1065, Merchantville , NJ 08109.
STAR*TECH Journal (ISSN 0739-1048) is published
monthly by Star Tech Journal. Inc .. 18 North Centre
Street, Merchantville, NJ 08109. Second Class post-
age paid at Camden, NJ.
7 Amp Power Supply ........ $29.95
12 Amp Power Supply . .. ..... 35.95
(6 month warrenty on power supplies)
19" Color Monitor .. . ......... $199
13" Color Monitor . ........... $189
We are the leading
CONVERSION KIT
PARTS SUPPLIER
in the business. Joysticks,
Buttons, Wiring Harness, etc.
14253 West 11 Mile Road• Oak Park. MI 48237
Toll-Free: 1-800-826-7268
IN MICHIGAN: (313) 542-5530
SEMITECH INC.
DISCOUNT ELECTRONICS
With The Operator In Mind
Same Day Shipping
- APRIL SPECIALS -
P4040 - 1 4.50 (Draw 80 Processor)
2716 - 2.50
Call Linda
2732 - 3.75
Today She
2764 - 2.50
Wants Your
27128 - 3.95
Business
27256 - 4.25
8080A - 5.95
7805, 7812, 7905, 7912 - 49¢
Quantity Discounts
O.E.M. Account Specialist
We Have A Full Line Of
Integrated Circuits And Electronic
Components At Discount Prices.
1 -800-356-3 7 59
In NJ - 609-346-9814
13 Tenby Chase Dr.
Voorhees, NJ 08043
1 Million Dollars
On The Shelf
Inventory
STAR*TECH Journal
I
Aptil 1988
Data East Vigilante Power Supply Short
Neal Zook
Data East Service Department
San Jose, California
PROBLEM
Mounting feet shorting out power supply.
The Vigilante conversion kit comes with
metal mounting feet to facilitate mounting
the PCB set to the cabinet wall. The mount-
ing hardware supplied consists of four
mounting feet with screws and fiber wash-
ers. The fiber washers are supposed to be
installed between the PCB and the metal
mounting feet as shown in Figure 1.
CAUSE
We have reports from the field indicating
that the fiber washer has been installed
between the screw and the PCB as shown in
Figure 2. The PCB foil pattern has +5 volts on
the component side and ground on the sol-
der side. This mounting configuration can
cause a shorted condition between the +5
volts and ground.
Reports indicate that this can cause damage
to some types of power supplies and can
cause failure to the Vigilante PCB.
c:.-=J='*••~ f1e.£0
WASeER
Figure 7 (correct)
Figure 2 (wrong)
SOLUTION
When using metal mounting feet, always
install the fiber washer between the PCB and
mounting feet as shown in Figure 1.
Wells-Gardner 194901 Brightness Problem
Sam Cross
Godwin Distributing Company
North Little Rock, Arkansas
PROBLEM
Rippled brightness or problems with bright-
ness consistency.
CAUSE
C702, a 10 microfarad capacitor at l00vdc
with radial leads has failed, causing bad
filtering on the B+ boost voltage supply to the
final color output transistors.
NOTE
Even though the B+ boost voltage is
180vdc, the monitor design is such that the
negative lead of C702 is connected to the
positive B+ voltage of 125vdc, and this a
allows use of a capacitor without such a WI'
high voltage rating.
***

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