----- Original Message -----From: Jon CarrollSent: Tuesday, September 22, 2009 10:19 PMSubject: Re: [Ensoniq-VFX-SD] Re: newbieLooking at the power supply schematics, i dont see a +35... i see a +50...
----- Original Message -----
From: "Gary Brumm" <gabru@comsec.net>
To: <Ensoniq-VFX-SD@yahoogroups.com>
Sent: Tuesday, September 22, 2009 1:44 PM
Subject: RE: [Ensoniq-VFX-SD] Re: newbie
Hi Jamie,
I do not remember a -35 from the PS....I will check. Sometime the display
lights up all segments and sometimes it is blank....the buttons
are non-responsive for the most part...seems different every time I start it
up. It also came with a Cesium Sound ROM Cart.
Thanks,
Gary
From: Ensoniq-VFX-SD@yahoogroups.com [mailto:Ensoniq-VFX-SD@yahoogroups.com]
On Behalf Of jammie
Sent: Tuesday, September 22, 2009 10:12 AM
To: Ensoniq-VFX-SD@yahoogroups.com
Subject: Re: [Ensoniq-VFX-SD] Re: newbie
its +5v and -5v for the filament of the fip then theres a -35v from psu for
the anode and cathode suplly
via 2 display drivers 1 does the row 1 does the colume the 1 display driver
also does the push button switches and drives the leds for those swithches
via led drivers and logic
its the same design used in the eps /eps16+/asr10/vfx-sd/and the ts10/12
until they did the purple lcd screen for the asr88 and later asr10
----- Original Message -----
From: tomlinson6050<mailto:tomlinson6050@roadrunner.com>
To: Ensoniq-VFX-SD@yahoogroups.comEnsoniq-VFX-SD@yahoogroups.com>
Sent: Tuesday, September 22, 2009 5:46 PM
Subject: [Ensoniq-VFX-SD] Re: newbie
i'm in Richmond KY. about 100 mi south of Cincinatti.
my thoughts on your VFX:
i don't think there is a -5 volt line: two +5s
there should be a 50-volt output from the power supply for the vacuum
display.
when you open the front panel, there will be three connectors to the panel
/display board: one on the left, two on the right. check them for corrosion.
thanks for the welcome
bill
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Message
Re: [Ensoniq-VFX-SD] Re: newbie
2009-09-23 by jammie
thers no +50
the biggest voltage is a 38vac which goeos into a
bridge rectifier circuit which is tied at c.t to give 19v 0v -19v
ac
then the 38vac goes to a rectifier that makes it
vdc38 then it goes through an inverter circuit comprising of 2 transistors the
c.t of the filament supply 5.5 vac being 0v also goes to this inverter
circuit the output leg has -35 volts coming from it pin 3 on the psu
connector for the keypad and disply header it will have this written on the psu
the other header comes from the mainboard and has
display written on it