Vector The Black And White Monitor Faq And Guide

Black & White Vector Monitor Guide  
Page 41 of 51 You might try unplugging the high voltage supply and see if that cools things down.  Also check 
the fuses. F100 and F101 should be 5 Amp slow-blow.  F700 and F600 should be 2 Amp fast-blow. 
F102 should be 1 Amp slow-blow. 
 
If the fuse values are all correct, try unplugging the output transistor connectors (P700 and P600).  
If unplugging either of those helps, check the output transistors that connect to those connectors.  
They are mounted on the...

Black & White Vector Monitor Guide  
Page 42 of 51  
Symptom: Slight Vertical Size Changes Back And Forth In The Picture. 
 
This is often caused by a flaky linearity POT on the monitor deflection board. With a Wells-
Gardner V2000, the vertical adjustment is at R600. The Electrohome G05 has four POTS instead of 
two, with vertical adjustments at R600 and R602.  
  
Symptom: Fuzzy Picture. 
 
The picture getting fuzzy implies fading capacitors. Replace all the capacitors in the HV cage. Get 
low ESR and...

Black & White Vector Monitor Guide  
Page 43 of 51  
Also check for bad solder joints or a hairline crack in a trace. I would check the pins that connect to 
the large transistors mounted on the side REALLY closely. I would also do a continuity test on all 
the pins. 
  
Symptom: No Picture. Neck Glows. Damage To C100, P701 And C102. Fuses Blow. 
 
Check the chassis transistors for shorts. If one is shorted the right way (emitter to base) or 
(collector to base) it will destroy the new deflection board...

Black & White Vector Monitor Guide  
Page 44 of 51  
G05-801 troubleshooting information 
(from Atari’s “The Book”) 
 
 
G05-801 Power Supply Board 
 
The following procedure is for the +25 volt power supply. Components in parentheses are for the 
–25 volt power supply. All voltage measurements are to the chassis. 
 
  
Symptom: Fuse 100 (101) open 
 
Check bridge rectifier DB100 for shorted diodes. Check capacitor C100 (101) for short. Check 
ZD100 and ZD101. 
  
Symptom: 25VDC measures 40V 
 
Zener...

Black & White Vector Monitor Guide  
Page 45 of 51  
G05-801 High-Voltage Board 
 
 
Symptom: Fuse open (F900) 
 
This may be a matter of adjustment. Locate the high-voltage adjustment pot R912 (next to Q901). 
Rotate it completely clockwise. Replace fuse and apply power. Place positive lead of meter on pin 
5 (gray wire) of the harness input connector P900. Slowly turn the high-voltage adjustment until 
the meter reads 90V. If the fuse opens again, check the following components. 
 
Opens: ZD900, ZD901,...

Black & White Vector Monitor Guide  
Page 46 of 51 Follow the steps listed below to determine which is the faulty board. The Y measuring points are in 
parentheses. 
 
Missing X (Y) information 
1. Set your voltmeter on “AC” and on the 10-volt scale. 
2. Measure the voltage at pin 1 (3) of P703. The meter should read 4.5V +/- 1V. If less 
than 3.5V or even zero, the game PCB is defective and the monitor is probably OK. 
3. Measure the voltage at pin 2 (3) of P702. The meter should read 4.5V +/- 1 V. If...

Black & White Vector Monitor Guide  
Page 47 of 51 If the red LED is off: 0504 is open, Q503 is shorted, contrast control R526 is open or there is no Z 
input from the game PCB. 
 
  
G05-801 Transistor data 
 
Alrighty, then, let’s look at the schematics for the G05-801 monitor. Q701 and Q702 is a 
differential amp powered by Q703, a constant current supply. Q703 is being run at about 3.6 mA 
(0.65 volts through 180 ohms). Q701 and Q702 normally share this current equally, so about 1.8 
mA average...

Black & White Vector Monitor Guide  
Page 48 of 51  
WHAT TO DO WHEN YOU DON’T KNOW WHAT TO DO  
If you are totally confused about where to begin to hunt for a problem, and can’t find the problem 
in the “SYMPTOM DIAGNOSIS” subsection, there may be another way to proceed. 
 
Take a VOLTMETER and (if possible) an oscilloscope and begin probing the jacks. You can start 
with the input jack to the monitor. Using the oscilloscope, make sure both the “X” and “Y” 
information is present (which it isn’t during...

Black & White Vector Monitor Guide  
Page 49 of 51 Appendix A: Common Ground Connections  
 
 
From: John Robertson  
Newsgroups: rec.games.video.arcade.collecting 
Subject: TechTIP: How to make VECTOR MONITORS very RELIABLE! 
Date: 22 Oct 2001 
 
 
It’s been a little while since my last Tech Tip, but this is something that’s been on my mind for a 
while now, and a posting in the Vector mail-list got the following response from me...: 
 
Vector monitors blow up because the ground reference for the...

Black & White Vector Monitor Guide  
Page 50 of 51 Appendix B: Testing Transistors  
Most of the failures in the Electrohome G05 or Wells-Gardner V2000 monitor (as is the case with 
most electronic devices) are semiconductor failures, specifically, the transistors. All transistors 
discussed in this document can be tested in the same way; it does not matter if they are the large 
chassis-mounted transistors or the tiny PCB-mounted transistors. With the transistors out of circuit, 
set your multi-meter on...