m_emelchenkov
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Posts posted by m_emelchenkov
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I have replaced IC401. The wobbling now way less than before, but far from ideal. I also stabilised input voltage (not to 220V, but to 230V). Now I have some more ideas what to try, it will takes time though.
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I will write here after my experiment of IC401 replacement and stabilizing input voltage.
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@Zitruskeks, yes, I think it is IC401, I checked its output with oscilloscope and it points out problems in this chip. I am awaiting shipping right now, in two weeks, maybe. Also possible cause is an over-voltage on +9/-9 lines (due the fact that instead 220V I have 240-250V)—I need to buy a voltage stabilizer to isolate this cause.
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I looking at https://console5.com/techwiki/images/f/f8/Vectrex-Troubleshooting_Guide.pdf, Symptom "Picutre size changed and unstable when input voltage is normal". There is info that IC501 should have PIN 5 = 5VDC and PIN 8 = 3VDC. I have 5V on pin 5 but 12 V on PIN 8. Something wrong with the system? I looking at LM555 datasheet, its MIN voltage is 4.5V and MAX voltage 16V (it's supply voltage, pin eight). So, how could it be 3V? It simply will not work, if I understand correct.
Also, waveforms of T502 pin 7 and Q502 base (pin 1 according to datasheet) should be the same. It is not. Here is a screenshot (blue is T502 and yellow is Q502). It was made not at Test #3, but as far as I remember it is the same in any mode.
Waveform of IC501 in my board is 45 ms, not 50ms. Wrong? Can change it to 49ms using potentiometer (max position), and no change in wobbling issue.
Also, I have a different input voltage: ~11.5 V instead 8.5-9V. I suppose it's due input voltage 250V instead 220V, and (maybe) not very good chinese AC transformer (I bought 220V 9-0-9 as a replacement to a dead original). However, I can say all these wobbling were with an old transformer too (it was a 220V model in 250V network).
Any ideas what to do?
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I have one dual amp. chip: LF353N.
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Spinball on my Vectrex. Video does not reproduce wobbling very well, but wobbling is very high.
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Zitruskeks, mine looks not very bad at turn on and become worser after several minutes powered on. Not only wobbling but zoom in-zoom out picture. After recapping it become better, but still not good. Integrator caps were replaced too (I bought a full recap kit from Console5). When I asked about buzzing sound people told me it is OK for this model.
Did you tune the DAC offset yet?
Yes. If I did it right: I tuned it to the zero level with oscilloscope.
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Hi! I have replaced all caps on my Vectrex MB. I have checked +5V, -5V and -13V, they seems OK. I have not tune high voltage yet, because awaiting shipment of a high voltage probe for oscilloscope.
The "wobbling" problem still exists. Please look at the video. What do you think, where to dig next?
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Indeed, I have only 100:1 oscilloscope probe, it was a typo. I checked prices of 1000:1 probes before and found only very expensive. Now with your help I checked again, both for multimeters and oscilloscopes and there are good variants. Thanks for help!
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Hi all! In Vectrex service manual you can find info about troubleshooting, one of paragraphs contains instructions to measure 5.8 KV voltage. My oscilloscope can't handle it even with 1000:1 probe which I have, my digital multimeter don't have a such large limit also. What equipment do you use for these measurements?
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I mailed local transformers factory, they do not have necessary frame to build the same. So, my question now, are you sure its power is 3A? There are no such info in manuals.
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Try https://www.ebay.com/itm/280746981090
Wire colours are different. onnect the blue wire to where the red wire was on the power board, and the black wire where the white wire was on the power board.
Thank you! 3A power is fine for Vectrex, right? Also, if you have the same transformer, does it fits into original case? (or, at least, does it have the same distance for screws?)
Upd: unfortunately, this item is USA Shipping Only. I need one in Russia. I will order, probably, from a local factory. Because it is a heavy item so I will need to pay for shipping a lot to deliver from abroad.
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By the way, @Vectrexer, where did you read about 8.5V? I am looking at power board schematics and see 9V.
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Hi! Please recommend replacement for "ELECTRONIC SALES ES-66-073 2T1935" 220V Vectrex transformer. It should be 220 - 8.5x0x8.5, right? And what its current, what to buy? By the way, I can't find anything with 8.5v, only 9v. Are you sure it is good to supply over-voltage to Vectrex?
And what may happened if all three wires of secondary winding shows 0 Ohm?
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I've got the connectors I ordered, and should to say they are really good. Here are photos.
The package (it was in a box with air bags inside):
New connectors:
Left — an old (original) one, right — the new one.
A motherboard with installed new connector, unsoldered yet.
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Luckily, I've negotiated the shipping with one of US-based sellers of these items, and the topic can be closed now.
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It is computer DB9, not game console. For game consoles they are plastic, look at any Sega, Vectrex, etc.
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mattsoft, it will be the easiest way, if the caps cause the problems. I awaiting shipping of ESR meter to check capacitors first, and if any faulty, then order a replacement set. Right now I am looking for joystick sockets (http://atariage.com/forums/topic/284488-wtb-atari-like-db9-sockets/?do=findComment&comment=4145039), to be able to start Test cart program.
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I looking for Atari-style DB9 male sockets for joysticks. Preferred — Vertex original ones, but modern is acceptable too. I tried Ali, everybody sells NES and Sega clones with these sockets but nobody sells sockets separately. Asking sellers who sells SNES sockets gave no results. Where to buy spare parts? Shipping from China/EU preferred.
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For Vectrex MB want to buy:
- two controller connectors (from Vectrex side). Are they standard? Appreciate any recommendations where to buy originals or alternatives. I see, it is standard DB9, and I hope someone know where to buy original plastic ones or just its pins.
- reset button.
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With some help from "Rolo" user and looking at schematics from service manual I found out that 9th pin on both connectors (from Vectrex side) was broken. What a pity! I need a replacement for both connectors now. Are they standard? Can I buy it somewhere?
UPD: I see, it is standard DB9, and I hope someone know where to buy original plastic ones or just its pins.
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I want to fix joystick issues first. According to info I've found about its voltage:
GND (pin
<--> -5V (pin 9) — I get 4.72VGND <--> +5V (pin 7) — I get 4.89V
GND <--> analog X (pin 5) — I get 4.72V at center and +- 0.1V at stick's extremum positions. But I should get 0V at center and 3.4V at extremums.
So... how to debug it, where is the problem could be?
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Yes, this will require proper debugging. Most likely capacitors to be replaced.
Probably. But which ones, it is still a question. I just found Troubleshooting Guide, I'd like to try its recommendations, but am I understand correct that I need to load a test cartridge before doing any measurements (including those ones with oscilloscope)? It's a problem to me, I don't have a Test Cartridge, only Multicart with Test Cartridge ROM loaded, but can't run it due to joystick malfunction.
There is a brightness control on the back. Reduce the brightness until the rays disappear. If that doesn't help it is another hardware problem that will require debugging.
It helped. Thanks! And sorry that I did not notice the forum topic about this issue, it was already covered on the forum.
You'll find a lot of hardware description online for the voltages for the joystick and buttons
I'll look. When I will fix the joystick I'll be able to load Test Cart and try to debug display shaking.
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Picture wobbling
in Vectrex
Posted
I think, mine one could be improved. I'll post here if I will have any success with it.