randyfromm.com
Technical Department
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Sci.Electronics.Repair FAQ - A collection of repair tips and hints
Sega Service Department
Stern Pinball Service Department
Pinball repair information from pinballHQ.com
Illustrated Merit XL hard drive conversion
Coin, Vending, and Amusement Machine Servicers and Repairers
 
Monitor_schematic_diagrams
ADI (Also known as "Disco")
Standard Resolution /Medium Resolution
Manual .pdf

Atari Raster Scan
Deflection / Video / Wiring
Manual .pdf

Atari X-Y
Deflection / EHT / Wiring
Manual .pdf

Ducksan
ducksan_cgm1301.jpg
ducksan_cgm1301v.jpg
ducksan_cgm1901cw.jpg
ducksan_type19.jpg
ducksan_type20.jpg
ducksan_vga.jpg
ducksan_vga_14_19.jpg

Electrohome
electrohome_g19_cco.jpg
electrohome_go5_eht.jpg
electrohome_go7_cbo.jpg
electrohome_go7_fbo.jpg
electrohome_go8_001.jpg
electrohome_go8_003.jpg
GO2 Manual .pdf
GO5-801 Manual .pdf
GO5-802 Manual .pdf
GO7 Manual .pdf
GO7 CAO Manual .pdf
GO8 Manual .pdf

Eygo
eygo_1520_e13.jpg
eygo_1520h.jpg
eygo_1620.jpg
eygo_1620_h19.jpg
eygo_1628h.jpg
eygo_deflection.jpg
eygo_remote_pcb.jpg
eygo_video_output.jpg
Manual .pdf

Hantarex
hantarex_mtc900.jpg
hantarex_mtc9000.jpg
hantarex_mtc9300_ps.jpg
hantarex_polo_deflection.jpg
hantarex_polo_ps.jpg
MTC900E Manual .pdf
MTC9000 Manual .pdf
MTC9110 Manual .pdf

Happ Controls
KJxx15 Manual .pdf

LAI
LAI KZXYB Manual .pdf

Matsushita
matsushita.jpg (Pole Position)
matsushita_tm144gsr.jpg
TM202 Manual .pdf

Motorola Monochrome
motorola_m5000.jpg
motorola_xm501.jpg
XM501 Manual .pdf
M5000 Manual .pdf

Mr. Do!
mr_do_14inch.jpg
mr_do_20inch.jpg

Nanao
nanao_kz_20en_d.jpg
nanao_mc1600.jpg
MC2000S Manual .pdf

Neotec
neotec_nt25_deflection.jpg
neotec_nt25_ps.jpg
neotec_nt25_video.jpg
NT2515 Manual .pdf

Nintendo
nintendo_20ezv_rb.jpg
nintendo_20ezv_rc.jpg
nintendo_video_inverter.jpg
Pentranic
pentranic.jpg
pentranic_model1000_ps.jpg

QNIC
qnic_cgm2500.jpg

Sampo
sampo_kgr1901.jpg

Sanwa
sanwa_20i16du_delfection.jpg
sanwa_20i16du_video.jpg

Sanyo
sanyo.jpg
14 Inch Manual .pdf
EZV Manual .pdf

Sejoo
sejoo.jpg

Sharp Image

sharp_image_25_27_cga.jpg
sharp_image_dual_scan.jpg
sharp_image_si134.jpg
sharp_image_si319.jpg
sharp_image_si325.jpg
sharp_image_si327.jpg
SI134.pdf
SI134DS.pdf
SI134EGA.pdf
SI134SVGA.pdf
SI214SVGA .pdf
SI219SVGA.pdf
SI227EGA.pdf
SI227SVGA.pdf
SI239.pdf
SI239DS.pdf
SI239EGA.pdf
SI239SVGA .pdf
SI313FV .pdf
SI319.pdf
SI319S.pdf
SI325.pdf
SI325EGA.pdf
SI327.pdf
SI327DS.pdf
SI425DS.pdf
SI525DS.pdf
SI527DS.pdf
SI527DS-SY.pdf
SI534DS.pdf
SI538DS.pdf

Sharp
sharp_xm2000n.jpg
Manual .pdf

Tatung
tatung_deflection.jpg
tatung_video.jpg

TEC Monochrome
tec.jpg
TM600 Manual.pdf

Telcovision
telcovision.jpg
telco14.jpg

Toei
toei.jpg

VT-2040
vt2040_deflection.jpg
vt2040_video.jpg

Wells-Gardner sub-dir
(more schematics)
wg_color_xy.jpg
wg_k4600.jpg
wg_k4800.jpg
wg_k4900_med_res.jpg
wg_k4901.jpg
wg_k4902.jpg
wg_k4903.jpg
wg_k4904.jpg
wg_k4911.jpg
wg_k7000.jpg
wg_k7191.jpg
wg_k7201.jpg
wg_k7302.jpg
wg_k7401.jpg
wg_k7500.jpg
wg_k7501.jpg
wg_k8104_deflection.jpg
wg_k8104_ps.jpg
wg_u2000.jpg
wg_u3000.jpg
wg_u3000ps.jpg
wg_u5000.jpg
wg_v1001.jpg
wg_v2000.jpg
19V1001.pdf
19V2000.pdf
K4600.pdf
K4901.pdf
K4915.pdf
K6100.pdf
K4500.pdf
K7000.pdf
U5000.pdf

By Subscription Only
Subscribers Enter Here

Membership includes the complete contents of Randy Fromm's Big Blue Book of Really Great Technical Information, available in high resolution PDF format for printing and in HTML for quick online viewing.

Also inside are my popular and efficient Troubleshooting Flowcharts for Monitors

150 Podcasts featuring:
  Videogame Troubleshooting
   Monitor Repair
   XY Monitor Repair
   Beginning Electronics
   Semiconductors
   Linear Power Supplies
   Switching Power Supplies
   Videogame Conversions
   How to Use an Oscilloscope
   Easy Pinball PCB Repair
   Using a DMM

More content being added all the time!

Please allow 48-72 hours for username and password to be established.

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Over 30 years of game repair experience condensed on one website.

Here is some of what you'll find inside:
An Introduction to Electronics 
Understanding Resistors and Resistance
Grounded!
Electrolytic Capacitors
Electrolytic Capacitors and ESR
Understanding Diodes and Transistors 
Take a “Triac” and Call Me in the Morning 
The MOSFET
Darlington Transistors
Datasheets
The Digital Multimeter
When Test Instruments Lie
Optical Couplers
How Components Fail
Locating Short Circuits
Phantom Voltage
Videogame troubleshooting
A Day in the Life
More troubleshooting tips
The Minimalist Mechanic
Repair Log
The Zen of Troubleshooting
Transformers
Understanding Linear Power Supplies 
Switching Regulator Power Supplies
Power Supply Repair Guide
Meet Peter Chou (Mr. Power Supply)
Testing the Power Supply
Three Terminal Regulators
How Monitors Work
Adjusting Monitors 
Isolation Transformers
Linear Voltage Regulator Failures
Using a Variac
Troubleshooting SMPS Primary Failures 
Unlock the Mystery of Monitor Troubleshooting
B+ is the key
Video
Video B+
Low Voltage Equals High Brightness
Loaded to Death
Understanding Vertical Deflection Circuits
Which Chip is Which?
Troubleshooting Horizontal Deflection Circuits
When Horizontal Drive Goes Bad
High Voltage Units
Flyback Derived Power Supplies
High voltage indicator tool
X-Ray Protection 
He Shoots, He Scores! 
Blanking
Sync Me! 
Repair Log - The Dark Side
Deflection Yoke Interchangeability 
Swapping Neck Boards  - Not! 
Color Monitors and Degaussing 
Replacing Picture Tubes 
Swapping Picture Tubes 
Shooting the Tube 
CRT Rejuvenation and Restoration
Heater-to-Cathode Short?  Put a long in it!
Bright Ideas for Monitors 
Using an ordinary light bulb
Phil, the Filter Capacitor 
Common Capacitor Failures in Older Monitors
Wells-Gardner's U2000 
Troubleshooting Neotec Monitors 
Hantarex MTC9000 Monitor 
Electrohome G07 Monitor 
Adjusting Monitor Widths 
Understanding Monitor Resolution
The Time Machine 
How to Choose a Replacement Monitor 
Adding Remote Monitors 
Do It Yourself Logic Board Repair 
Understanding Solenoid Driver Circuits 
Understanding Pinball's Switch Matrix 
Understanding Pinball's Lamp Matrix
A technical look at Pinball 2000
Troubleshooting Pinball Switch Failures
Pinball’s High Voltage Power Supply
Gottlieb Bows “Smart Switch” 
Gottlieb’s System 3 Pinball
Troubleshooting Audio Amplifiers
Lightning Strikes
Protecting your games from damaging discharges
Beating static electricity
Motor Control 
Understanding Ticket Dispensers 
Deltronics Ticket Dispenser Manual 
Ticket dispenser troubleshooting chart
Servicing Bill Accepters - Mars VFM4 
Understanding The Oscilloscope
Curve Tracer 
Introduction to Digital Electronics 
Replacement Parts 
What to get and where to get ‘em
Component Replacement and Soldering
SMD Rework 
Removing Integrated Circuits from Junk Boards
Conversion Hookups 
Connectors
Meter Methods - Adding coin meters
Working With Plexiglass 
Formica Magic
Mondo Bondo
Video Game Shopout Checklist
REFERENCE SECTION
Guide to Schematic Symbols
Resistors 
Semiconductors 
Power Supplies
Pinball Switch Matrix/ Lamp Matrix
Monitor Troubleshooting Flowcharts 
The Zener Diode