Arcade game monitor problem
I have an old asteroids full size vintage video game .
I has a black & white monitor . When it first comes on its fine . Within 10 minutes the whole image gets bigger , things disappear off the edges . The center of the screen gets a bit darker . I suspected the hi voltage diode off the flyback and adjusting the hi voltage pot but replacing that did not help . I dont have any model #s the monitor has one medum circuit board and one small board with the flyback in a metal box . Thanks |
Arcade game monitor problem
rec.games.video.arcade.collecting is the correct newsgroup.
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Arcade game monitor problem
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Arcade game monitor problem
Thanks Franc .. I dont know which conection is B+ on this . It seems to
be a Wells Gardner monitor according to a website provided i an arcade newsgroup . |
Arcade game monitor problem
Ken G. wrote:
I have an old asteroids full size vintage video game . I has a black & white monitor . When it first comes on its fine . Within 10 minutes the whole image gets bigger , things disappear off the edges . The center of the screen gets a bit darker . I suspected the hi voltage diode off the flyback and adjusting the hi voltage pot but replacing that did not help . I dont have any model #s the monitor has one medum circuit board and one small board with the flyback in a metal box . Thanks This is an XY monitor, the scan is very different compared to a normal tv. Try this Page http://www.gamearchive.com/Video_Gam...i/monitor.html The fault sounds like b+ is going low, maybe a bad cap in power supply. I think from memory its 123v to HT Generator Board. |
Arcade game monitor problem
On Fri, 24 Oct 2008 08:33:20 -0600, (Ken G.) put
finger to keyboard and composed: Thanks Franc .. I dont know which conection is B+ on this . It seems to be a Wells Gardner monitor according to a website provided i an arcade newsgroup . I would think that one end of the primary winding would be connected to the collector of the switching transistor, the other to the B+. If the FBT has any part numbers, try locating a substitute he http://www.hrdiemen.es/products/inde...anguage=eng-GB The HR substitute will have a wiring diagram with voltages. I notice that the Wells Gardner Quadrascan colour monitor at the Atari link provided by Dean uses a HV regulator circuit that senses a 180V pulse from a tap on the primary winding and uses this feedback to vary the B+ to the FBT, and thereby control the EHT. - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
Arcade game monitor problem
Ken G. wrote:
I have an old asteroids full size vintage video game . I has a black & white monitor . When it first comes on its fine . Within 10 minutes the whole image gets bigger , things disappear off the edges . The center of the screen gets a bit darker . I suspected the hi voltage diode off the flyback and adjusting the hi voltage pot but replacing that did not help . I dont have any model #s the monitor has one medum circuit board and one small board with the flyback in a metal box . Thanks Sounds to me, more like the Filament Voltage is dropping, cold solder joint in filament circuit ? This describes what happens to the image when I reduce the filament Voltage on my Transmission Electron Microscope ! Yukio YANO |
Arcade game monitor problem
Yukio YANO wrote:
snip This describes what happens to the image when I reduce the filament Voltage on my Transmission Electron Microscope ! Your _own_ TEM? Really! Do you have photos of it on a site somewhere? Michael |
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