ENSONIQ VFX-SD MANUAL PDF

Also, a lot of the Ensoniq power supplies are virtually identical or at least very similar to the VFX series, so a lot of this applies to additional machines such as the SQ80, etc. The service manual contains the basic info needed to check the power supply, so reference the service manual to check whether the AC and DC voltages are in spec or not. The transformer outputs three separate sets of AC voltages, each one is a "triad" of wires with the middle wire being the common wire. Use a multimeter to measure the AC voltage between the two reds, the two yellow, and the two browns. Make sure the results reflect what is in the service manual.

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Also, a lot of the Ensoniq power supplies are virtually identical or at least very similar to the VFX series, so a lot of this applies to additional machines such as the SQ80, etc.

The service manual contains the basic info needed to check the power supply, so reference the service manual to check whether the AC and DC voltages are in spec or not. The transformer outputs three separate sets of AC voltages, each one is a "triad" of wires with the middle wire being the common wire.

Use a multimeter to measure the AC voltage between the two reds, the two yellow, and the two browns. Make sure the results reflect what is in the service manual. The brown triad supplies about 9VAC to the display. Most of the AC voltage supplied by the transformer goes through two points: rectifier diodes and fuses. The other four rectifier diodes CR3-CR6 are 1N as well and as a group form a full-wave bridge rectifier. The brown triad stays AC so it does not go through any rectifier diodes and simply goes through fuse F5 before being sent out to the display filament.

The DC voltages should be checked with the method given in the service manual. The PCB has each pin silk-screened, so it should be very obvious what to check for. The biggest thing to watch out for is the display filament AC output on the display header pins 5 and 6 , as everything else is DC voltage on the PSU output headers. Assuming the values at all these points fall within the accepted ranges specified by the service manual then all is probably well. However, there are a few other points to consider.

If the problem goes away then there are a couple things that could be going on. One way to narrow that down is to test the PSU for ripple. In other words, check for AC voltage where there is only supposed to be DC voltage present. In an ideal world, the AC voltage would show exactly 0. See those four black rectangles with the metal "fins" that are lined up and screwed into the back of the PSU? Those are voltage regulators. Ultimately, they are supposed to take voltage that is higher but imperfect and drop it down into a lower but perfect voltage.

LM - This is the only one that has five pins, all the rest have only three. The output voltage on and can be measured by putting the black probe on the center pin pin 2 and the red probe on the right pin pin 3. The output voltage on is measured differently!

The black probe goes on the left pin pin 1 and the red probe is on the right pin 3 [remember, the voltage will be negative on this regulator].

The voltages need to be significantly higher on the input for a regulator than what they are intended to output, so the inputs should be in the ballpark of 5 volts higher. Assuming the AC voltages off the transformer measure correctly, if either the input or the output voltages are incorrect then there are a few things it could be. Before the AC voltage hits the regulators, the AC voltages goes through rectifier diodes and smoothing capacitors which clip and smooth the AC voltage into DC voltage.

If only is giving weird results, look at C14 same kind of cap as C There is one small cap before and after each regulator usually a 0. This is usually coupled with excessive buzzing or other anomalies on the audio outputs.

If everything seems to work in general, but you experience lots of random crashes, lockups, etc. This is an often overlooked fact.

I think that about covers most of the common power supply woes in the Ensoniq VFX. One other regulator can be found close to where the power header is on the mainboard. Last edited by Rasputin on Fri Jun 30, pm, edited 1 time in total.

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Like ribbon cable length issues etc. Several soft buttons are intermittently non-functional, The VFX has 21 voices of polyphony. It can combine up to 6 waveforms in a single patch, resulting in some complex layered sounds. The synth also has full MIDI implementation with 12 channels for multitimbral functions.

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