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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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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 |
#2
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Arcade game monitor problem
rec.games.video.arcade.collecting is the correct newsgroup.
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#3
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Arcade game monitor problem
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#4
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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 . |
#5
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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. |
#6
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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. |
#7
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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 |
#8
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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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