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Transformer in Samson servo 500

Transformer (trafo) broken on primary circuit. Amplifier has been left switched on for many days and suddenly stopped working. All electronic is fine. All I want is know the place where can I buy new transformer, or place where can I fix it.

Posted by Anonymous on

  • Anonymous Apr 27, 2008

    I tried on radio shack, but they have popular trafos, but mine amplifier is a professional 500 W, and have untypical unit. There is no other equipment using transformer like this one in my Servo.
    Thanks for trying.
    P.S. I need original Samson part, or another amplifier with f.ex. burnt MOSFETS, or eventually company doing trafo's rewiring.

  • Anonymous Mar 25, 2014

    I need just wiring Trafo-primary...to Volt adjust

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  • Master
  • 682 Answers

Check (radio shack)near to you for transformer with same rating.or any electronic store.

Posted on Apr 25, 2008

  • Anonymous Apr 27, 2008

    do not mention.

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My 92 gsx600 I have a problem where I get plenty of juice out of the positive to my coil but my ground is weak from the coil to the ignition box


I suggest you check the circuit diagram to discover whether the ignition system is a true Capacitive Discharge Ignition or whether the electronic box of tricks is a programmed amplifier that effectively replaces the old fashioned contact breaker.

There are few genuine CDI systems due to the size, complexity and the lethal level of their output. Most systems are the latter type where the current flows through the ignition coil to the amplifier where it is grounded as if by a contact breaker. When the engine rotates a trigger causes the amplifier to suddenly switch off breaking the circuit so the collapsing magnetic field of the coil primary winding induces a spark from the coil secondary winding.

The trigger could be an optical type, a hall effect generator or most commonly a magnetic reluctor type.

When the engine is stationary the programmed amplifier usually switches off after a few seconds preventing the relatively high current flow from overheating the coil and discharging the battery making checking the system difficult to check by conventional methods.

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Amp keeps blowing fuses


Blowing fuses, was caused by many thing.
Short of rectifier,resistor,elco,tube heater,tube pin, and also trafo itself (primary or secondary winding). It must check step by step.
CAUTION :
THIS IS HIGH VOLTAGE AREA.
RISK OF ELECTRIC SHOCK THAT CAN KILL.
DON'T DO THIS IF YOU ARE NOT TECHNICIAN OR NOT FAMILIAR WITH VACUM TUBE CIRCUIT. THE CIRCUIT MAY STILL CONTAINS ELECTRIC SHOCK EVEN IF IF THE AMP IS NOT POWER PLUGGED.


The simple steps (see picture) are:
  1. Disconnect all connection from secondary of power trafo (PLV,PDCH,PACH and PHV).
    Power ON the amp. If fuse is not blowing,trafo is good.
  2. Power OFF the amp. Unplug the cord.
    Connect PLV1-PLV2-PLV3 (this are Bias voltage,+/-15VDC and Backlight PCB voltage) to power trafo.Power ON the amp. If fuse is not blowing,PLV circuit is good.If fuse blowing,there are parts is damage (dioda,elco,7815/7915,resistor) in this PLV circuit.
  3. If step 2 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV circuit stay connected,connect PDCH 1-2 and PACH 1-2 to power trafo. Power ON the amp.
    If fuse is not blowing,PDCH and PACH circuit is good and all tubes heater/filaments are lights after a few seconds.
    If fuse blowing,there are parts is damage (dioda,elco,tube heater pins) in this PDCH/PACH circuit.
  4. If step 3 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV,PDCH,PACH circuit stay connected,connect PHV 1-2 to power trafo.
    Power ON the amp. CAUTION: HIGH VOLTAGE AREA is ON.
    If fuse is not blowing,PHV circuit is good.
    If fuse blowing,there are parts is damage (dioda,elco,tube pins) in this PHV circuit.
.amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-0.jpg
Notes:
  • Steps had to be done sequentially from 1 to 4, not upside down.
  • If tube/heater pin is short,it can't be repair. The tube must be replacing.
  • PDCH circuit is voltage for V1-2-3-4 heater/filaments.
  • PACH circuit is voltage for V5-6-7 heater/filaments.
  • Always replace fuse with same type.

amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-1.jpg

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If its a transformer based Amplifier you can rewind the primary winding for 230Volt. But it has to be done by a transformer specialist.
All one has to do is unwind the primary on a winding machine and make a note of the number of turnings in the coil. Then wind back twice the number of turns using half the thickness of the wire that was used for 110v.
Eg: if the there were 1000 turns of 20 swg wire in the 110 circuit when you rewind you have to use 40swg wire and wind 2000 turns on the bobin.

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Your issue is that the dimmer is not rated to handle the type of fixture/lamps its controlling.

From a lighting control standpoint, the 12V-lamps classify as "low-voltage halogen" and, somewhere in that circuit, have a transformer(s) converting the 120V~ down to 12V~. Using incandescent dimmers (like the one you are using) can cause compatibility issues with those transformers. What I suspect is happening is that the incompatibily is either throwing voltage spikes or current spikes on the line which are causing the dimmer to enter some sort of "safety" mode to shut everything down before any problems occur.

My recommendation is to first figure out what type of transformer it is: Either magnetic low-voltage, or electronic low-voltage. Ideally you would contact the transformer manufacturer (or look up their specs online) to figure that out. Other rules of thumb: if the transformer's big & bulky, it's probably magnetic - conversely if its lightweight, it's probably electronic. If its only one transformer controlling all of the lamps together, it's probably magnetic - conversely if its one of those transformers where the transformer and light bulb come togheter as one assembled unit and then snap into the track, it's probably electronic.

Then make sure the dimmer is rated for magnetic low-voltage, or electronic low-voltage (depending upon what the transformer is).

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If the hum stops you have something causing noise to the input.

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Make shure with an ohm meter that the primary and secondary windings have very little resistance on the main trasformer,then check voltage in trasformer and out from transformer...BIGRED

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