Star Tech Journal

Issue: 1983-December - Vol 5 Issue 10

28
STAR*TECH JOURNAL/DECEMBER 1983
Troubleshooting E/ectrohome and Wells Gardner Monitors (Part I) continued from page 27.
6. NO RASTER OR HIGH VOLTAGE, HAS FILAMENT
Since both the filament and high voltage are taken off the flyback windings,
missing one of these two voltages tells us the input signal is good to the
flyback. However, that particular section of the transformer may be bad to
prevent high high voltage.
The high voltage lead which connects to the picture tube comes directly
off the fly back. The secondary windings of the transformer for filament and
high voltage are separate from each other. The focus and screen voltage
come off the same winding as the high voltage. Test whether these voltages
are present ( focus measures with a high voltage probe). If not, suspect the
transformer. With voltages present, unplug power to monitor and discharge
high voltage from the second anode of the CRT to ground.
Disconnect the second anode cap from the CRT and place the cap by
itself so it won't short to anything. Be cautious, this voltage is normally about
25,000 volts DC. Power up the monitor. If you hear it snapping, crackling,
arcing or hissing, tum off the monitor. The high voltage is present, but the
CRT is defective. If no arcing sounds can be heard when the monitor is
powered up, measure the second anode cap with a high voltage probe. High
voltage is present, suspect the CRT - if it is missing, it can possibly be a
defective flyback transformer.
High Voltage Limiter (Protection) Circuit
The HVL circuit, also known more commonly as the high voltage limiter, is
a protection circuit Federal regulations require all manufacturers to provide
a way to protect individuals from receiving X-radiation, which can be
emitted from the monitor by excessive high voltage.
CONDITION
Raster, B+ High
Normally, as the B+ rises, so does the high voltage. To prevent
excessive high voltage, a protection circuit is added to the monitor which
samples the B+ voltage. The protection circuit acts as a triggering circuit, so
that when the B+ reaches a certain increased amount, the HVL is activated,
thus allowing no high voltage to the picture tube.
This symptom was mentioned earlier as no raster, no filament, no high
voltage and finding that the B+ measured too high.
An activated HVL circuit (higher than normal B+) can be caused
basically by one of three areas: the power regulator, protection, or horizontal
circuits. To narrow down the problem, tum off the monitor and disconnect
the triggering device. On Electrohome this would be the collector of X701 .
Wells Gardner is the collector of the transistor TR353.
After the collector lead has been disconnected from the rest of the board
circuitry, power up the monitor. At this point, the screen will show one of
two conditions: a raster (lit screen) or no raster. If a no raster condition is
seen, verify the no raster l>Y turning up the brightness control.
Obtaining a raster, measure the B+ at the emitter of the power regulator
transistor (Electrohome X04, Wells GardnerTR502). Normal B+ voltage
on the Electrohome monitor is 120vdc. Wells Gardner is 127vdc.
Normal B+ with a raster - the problem will be in the protection circuit.
B+ still high with raster indicates the problem is in the power regulator
circuit. No raster condition - the problem will be definitely in the horizontal
section.
Refer to the chart below for a breakdown of conditions and suspected
components.
ELECTROHOME
WELLS GARDNER
Raster, B+ Normal
D905, X902,
X901,X04
X701, D-701
X501, TR501,
TR502
TR353, TR354
No Raster
IC501
TR351
No Raster
X501, T501
TR352, T602
No Raster
X01, T502
TR601, T701
FUNCTION
Regulator
Circuit
Protection
Circuit
Horizontal
Oscillator
Horizontal
Driver
Horizontal
Circuit
Remember to reconnect disabled triggering component when finished (collector of X701 or TR353) .
*
ATARI
COIN VIDEO CUSTOMER SERVICE NEW LOCATIONS
Atari Coin Video Customer Service Centers in California and New Jersey have moved. Please note their new locations:
CALIFORNIA
735A Sycamore Drive
Milpitas, CA 95035
408/943-1120
800/538-1530 Toll Free
NEW JERSEY
22A World's Fair Drive
Somerset, NJ 08873
201/469-5993
800/526-3849 Toll Free
*
BALLY MIDWAY
MS. PAC-MAN SPEED-UP MOD
By Jake C. Leonard, Richmond, VA
REJUVENATE MS. PAC-MAN!! You will need a good
quality SPDT micro switch attached to the front panel. Lift pin
11 at 8C, run a jumper from the lifted pin to the common lug.
Attach a wire to pin 2 at 9C (leave pin 2 in the circuit). Run
this wire to the N .C. lug. Attach a wire to pin 12 of the V. RAM board.
Run this wire to the N.O. lug. Any time you flip the switch, the game
will run about twice as fast.
29
STAR*TECH JOURNAL/DECEMBER 1983
SfAR1i IECH JOURNAL
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VOL. 5/#1 MARCH '83
Purity, Converpence, and Tracking Adjustments for Wells-Gardner
Color X·Y Monitor • On The Service Trail ... Atari's "Pole Position"
Notes, Atarrs"Oig Dug'" Difficulty Adjustment, Atarrs"BlackWidow''/
"Gravita(' Update, The Operato(s Business Status, Sega"Tac·Scan"
Conversion Kit Bally/MidwafSuper Pac-Man" Drop Off, Bally/Midway
"Pac-Man Plus" • Sega 'Frogge/' Intermittent Sound • Rowe/
Seeburg Service Tips • Atari "Pole Position" High Score Retention
Mod, Gas Pedal Maintenance, Steering Wheel Lock·Up, Intermittent
Gear Shift, Double Vision • ROM/ PROM Test Cable Assy • Sega
Electronics' ROM Line (Part 6) • Data East Cassette System Power
Supply Mod • New System Preview/Atari's "Xevious" • Coinco
Com Return Level Mod • Bally/Midway "Pac-Man Plus" Precaution
• Taite "Front Line" Ribbon Cables • Taite "Wild Western" Option
Switch Settings • Atari Coin Door Part Numbers • Bally/ Midway
Picture Tube lnterchanpeability • Manufacts: Summary of Major
Op-Amp Circuits (Part 3) • News Bits/NEC 4·Me9abit Memory Chip
• BallyFeatureLampPowerSupplyMod • Gottheb"Q•Bert''Tem-
nical Notes, GoWieb's MA4000 Filter Board, Troubleshooting
Gottlieb's "Q•Bert" GG·III System • The "Bea(' Facts ... Digital
Logic Intro, 555 Timer Circuits, Kasee "Driver II", Ticket Dispenser
Feedback • An R&O Tax Credit for Your Electronic Coir>-Op
Business? • lnQuizitive • In Other Wolds/Video Games
Grade Coolant • Bally Midway "Grand Slam" Fly-Away Target
Adjustmen~ Bally Midway "Journey" Cassette Notes • New
System Preview/Cinematronics' "Cosmic Chasm" • Tech Shop
Profile/United Distributors, Inc. • Sega Electronics Service Bulletins:
Sega G·80 Power Supply Ground Mod, Sega "Zaxxon" Upright/Table
Joystick Mod • Sega Color X·Y Monitor Zener Replacement •
Analyzing the Data East Cassette System • The "Bea(' Facts: PAO
Show, R·S Latch O,P!ration, Keyboard Programmable Oivide-By-N
Counter, "Scoutbalr Troubleshooting Tips for Light or Sound Failure
• Sole Proprietorshig Life Insurance • Randustrial Corp. Mair>-
tenance Catalog • In therWords/Pinball Games/Mfg. • lnQuizitive
VOL. 5/#5 JULY 1983
News Bits/Dept of Labor Service Industry Growth Report New Tube
Family • Abloy Electric Switchlocks Get UL Listing • On The
Service Trail ... Atari "Pole Position" Front Glass Panel, Atari "Oig-
Oug" and "Xevious'' Contact Points, Sega Sit Down "Star Trek'' Start
Button, Meltec "Boom Balls" Trouble Areas • Bally Micway Service
Bulletins: "Journey" lntermittentShut·Off of Tape Cassette, "Mappy"
Difficulty Level Setting, "Wacko'', "Kozmik Kroot(', "Journey", etc.
Power Schematic Manual Errors, "SuJ>er Pac·Man"f'Mappy" Similar
Electronics Circuits • Micway Initiates Service Newsletter for
Operators • American Lock Company Develops New Security Cam
Lock • Wells-Gardner Color X·Y High Voltage Supply • Pace's
Pulse Heat Power Source • Manufacts: Sega Electronics' "Turbo"
Troubleshooting (Part 1) • Sega's New 24·Hour Rapic Return on
Serviced Parts • Cherntronics Triple Purpose Plastic/Glass Cleaner
• Build Your Own Logic Probe • Cinematronics "Cosmic Chasm"
Engineering Changes: Monitor: Jitter, Stray Lines, Power Problem,
Cooling, Erratic Trackball, Game Lock Up, Power Up Credits, Muffled
Audio • Sega Electronics' ROM Line (Part 10) • New System
Preview/Universal's "Mr. Do!" • Analyzing the Data East Cassette
System (Part 2) • The Importance of Good Cash Management •
Tech Shop Profile/Pioneer Sales & Service Inc. • The "Bea( Facts:
Power Supply Primer, JK Oivice-By-Counters, "Audio Skeebalr'
Tickets, Cotton Candy Vendor Retrofit Kit/New EPROM, Trouble-
shooting the CDC Micron Timer • Industry Technical Schools •
Bally "Baby Pac-Man" Switched Illumination Mod, Atari "Quantum"
Monitor Mod • In Other Words/Conversion Kits • lnQuizitive •
HELP! Williams "Gorga(' Solenoid Problem
VOL. 5/#2 APRIL '83
Stern "LostTomb" Service Notes • Atari "Pole Position'' Gas Pedal
Moddication • On The Service Trail .. Atari Customer/ Field Service,
Atari "Millipede" and "Tempest'' Option Setti~ Recommendations,
Wico's New Contact Points • Oes,Qn Scene Simulation System for
Sale • Bally Midway Service Bulletins: "Baby Pac-Man" Vidiot PCB
Adjustments, "Baby Pac-Man" Schematic Typo, "Baby Pac--Man''
Flipper E.O.S. Wiring, "Centau(' & "S~ak Easy" Solenoid Expander
PCBs • SegaElectronics' ROM Line(Part7) • ManufacturerPhone
Numbers for Canada and Other Countries • Gottlieb "Q•Bert''
Symptoms/Possible Causes, 8088 Microprocessor Notes • Nintendo
"Donkey Kong Jr." Speed Up/Down Kits • News Bits/Flat Computer
Displays • Manufacts: L~ic Board Lock·Ups • New System
Preview/Nintendo's "Popeye • Taite Troubleshooting Chart for
FMP001 Switching Regulator • Atari "Pole Position" Pulley Cable
• The "Bea(' Facts ... Logic Truth Tables, "Scoutbalr' Troubl&-
shootin9 Tips • In Other Words/Technical Terms • Data East
"BllTip N' Jump" Option Switch Settings • lnQuizitive
VOL. 5/#3 MAY '83
AOE '83 Highlights • Coin Acceptors, Inc. Introduces Low-Cost
Logic Board Tester • Bally Micway Service Bulletin: Thumper
Bumper Locking Ring • On The Service Trail ... National Lock
Reports on Lockout Problem, AOE '83 in Review • ADE Expo
'83/Nor>-Viceos • Manufacts: Sega "Turbo" PROM ldentdication
Chart • News Bits/Service Trends Survey • AOE Asides • Sega
Electronics' ROM Line (Part 8) • A New Company Introduces a New
Imaging Surface • New System Preview/Sega's "Star Trek'' •
Bally Midway Wire Cheating Kits • Tech Shop Profile • Bally
Feature Lamp BurnoutCIKe • New-Tone Electronics, lnc.'sTransient
Voltage Protection Unit • The "Bea(' Facts ... Logic Gates, Logic
Math, Oivide-by-N Counters, Pulse Generator, Namco "Hotbalr'
Hockey, Destron "Bio-Rhythm" and"Astrograph" Modifications• In
Other Words/Video Game Manufacturers • lnQuizitive
VOL. 5/#4 JUNE '83
AOE '83: Largest Yet • Kiddie Rides USA Debuts New Rices •
COINCO Coriducts Service Seminars • On The Service Trail ...
Williams Drop Target Jumper Wire Fix, Williams "Black Knight"
Flipper Coil Replacement• Atari"Tempest'' ColorX·Y Monitor, Bally
Midway "Super Pac-Man" Enhancement Chip • TCG Adds New
Replacement Parts • Manufacts: Introduction to the 68000 •
News Bits/Hybrid Flat Displays, Other Viceo Game Applications •
Sega Electronics' ROM Line ( Part 9) • Chemtronics Electronic
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VOL. 5/#6 AUGUST '83
News Bits/Downloading Video Software, ICs Soon to Become
Centipedes • Armor Chain Company Announces New Ant~ Theft
Anchor for Vending Machines • On The Service Trail ... Varistor
Protection, Sega's "Star Trek" Kil Taite Rectdier Heat Sinks,
Williams' New Plastic Cabinets • Atari Tech Tips: Dangerous
Di5P.lay Harness, Using the ZBO Interface, "Food Fight" Joystick
CahbratiorvSelecting Options • Bally Midway 125VA Power Supply
Blown Fuses Care • Bally Midway Service Bulletins: "Baby Pac--
Man" Memory Combinations, "Ms. Pac-Marl' RFI Modification •
Atari "Star Wars'' Hardware • Sega "StarTrek''f'The Kit" • Sega
24·Hour Turnaround Update • Gottlieb Power Distribution for the
~~1
O~~!~: atAtn~~\ !c~:e::r~~i~" Tie,:~ ~: "~o~~~
/! ~~;°
~::1:.2;~~=;f~e~it~~rw!~~fo~C~:~:~:;9~~s f~r N:;,~~!~c~
TF650 • Tech Shop Profile/Sandler Vending Company • Manu-
facts: Sega Electronics' "Turbo" Troubleshooting (Part 2) • The
"Bea(' Facts: Using Ohm's Law, How to Troubleshoot DC Power
Supplies, Troubleshooting Gino Rendina Hydraulic Toys, "Superbalr'
Ticket Motor Drive Mod; Ball Release Kit Ball Stop Guard, Ikemoto
"Frog Hunte(' Ticket Dispenser Kit • How to Use Low-Cost Photo
Equipment to Fight Crime• lnQuizitive •Al,Purpose Nar>-Contact
Aerosol Oust/Lint Remover Announced by Cherntronics • In Other
Words/CPU System
r---------------------Filloutandmail
VOL 5/#7 SEPTEMBER '83
News Bits/Funtastic Signs with the Games Network, Home Computers
to Win in Electronic Game Markel Gameline Offers Or>-Line Video
Games for the Atari VCS • Sega Monitor Repair Policy • On The
Service Trail ... Atarrs "Food Fight" Location Adjustments, Atari's
"Star Wars" Controls/Monitor Hi·Volta9e Board, Williams New
Flipper Assembly, Sega's "Star Trek'' Kit Installation • Trouble-
shooti"Q Gottlieb's "Q•Bert''/Foreground, Background • AMOA
Exposition 1983 • The "Bea(' Facts ... Series and Parallel
Resistance/Capacitance Ckts, Nor>-Viceo Game Troubleshooting
(Part2), Bally"Baby Pao-Man" Power-Up Problem, Solid State Sound
~eplacesTape Players in Kiddie Rices • Sega Plans Release of Rea,
Time Interactive Laser Oise System • Bally"Mr. & Mrs. Pac-Man"
Top Saucer Problem • Ten Ways to Ruin Your Business •
Manufacts: Troubleshooting the Atari Amplifone Color X·Y Display,
Atari "Crystal Castles" Checksums • Atari "Star Wars'' Color X·Y
Monitor Modifications • New System Preview/Cinematronics'
"Dragon's Lai(' • Sega Tech Tips/Universal Sound Board • Arcade
Debit Card System • 7th Annual Bally Midway 5·0ay School •
Tech Shop Profile/Bally Southwest • Atari Tech Tips: Amplifone
Color X·Y Monitor Voltage Regulator C~ "Tempest" Wells-Gardner
X·Y Monitor IPC Board Mod • Service Tips: Nintendo Monitor
Vertical Roller, Bally Pins 555 Lamp Burnout Bally "Baby Pac-Man"
Feature Lamp Burnout • In Other Words/Game Synonyms •
lnQuizitive
VOL. 5/#8 OCTOBER '83
News Bits/Plastic EPROMs Target Production Applications •
Cinematronics' "Dragon's Lai(' Intermittent Vertical Roll • Stern
"Frenzy" Power·Up Credits • Coin Alarm Systems by Capricorn •
On The Service Trail ... Sega "Star Trek'' G·BO Power Pins Nintendo
Control Panels, Manufacturers Need Help, Pre-AMOA Industry
Outlook • Bally Micway Service Bulletins: "Discs of Tron" 125VA
Power Chassis Mod, "Professor Pac-Man" Video Distortion • Sega
Burnt Power Supply Connector Mod • Managerial Strategies •
Base-Car Communication • New-Tone Electronics Quartz Crystal
Application Guice • New System Preview (Part 2) Cinematronics'
"Dragon's Lai(' • Troubleshooting Sega's "Frogge(' • Sega
Service Notes: Electrohorne Color X·Y Monitor Deflection Amp Mod,
G·BO Power Supply Connector Mod, "Pengo" EPROM Lock·Up •
Atari "Star Wars'' Unreliable Power-Up • The "Bea(' Facts: Laser
Oise Technology Brief, 555 Timer Update, Troubleshooting Motors,
Clutches and Brakes for Kicdie Rides and Arcade Pieces, Gino
Rendina "Rally Viceo Ca(' Review • Manufacts: Understanding
Speech Synthesizers • Star*Tech Journal 4th Annual Reader
Survey Results • Mylstar Sound/Speech Piggyback Board Replace-
ment • Jensen's New Catalog of Computer Equipment and Tools •
New System Preview/Atarrs "Crystal Castles" • Tech Shop
Profile/Workl-Wide Distributors • In OtherWords/S*TJ Advertisers
• lnOuizitive
VOL. 5/#9 NOVEMBER '83
News Bits/Videogames to Become Computer Terminals? New Color
Display Uses Liquic Crystals, Zilog's 32·Bit Microprocessor Chip,
The "McDonald's of Information'', Aandom-Access CED • On The
Service Trail ... Rowe OBA 1 /5 Bill Acceptor/Atari "Pole Position II",
~Joust" Pinball by Williams: Problems and Percentaging • Bally
Midway Service Bulletin: "Discs ofTron" Wiring Error • A Glossary
of Microprocessor Terms • Gino Rendina "Rally Video Ca(' Circuit
Operation (Part 1) • The "Bea(' Facts: 7 Segment Displays •
Videodisc Maintenance • Reading Effectively • Atari "Star Wars''
Tech Tips: Control Calibration, Freeze Mode Warning, PCB Component
Changes, AMO RAMs, Game Options • New System Preview/
Centuri's "Gyruss" • Manufacts: Sega "Champion Basebalr' Theory
of Operation • Bally Midway Service Manual • Pioneer PR·7820
L.fser Disc Notes: "Dragon's Lai(' Options/Mods, PR· 7820 Warranty
Procedure, Disc Mounting, Disc Cleaning • Tech Shop Profile/Brady
Distributing Company • In Other Words/Laser Disc Optics •
lnQuizitive
------------------y
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