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Old 17th February 2008, 03:22 AM   #1
vypr is offline vypr  United States
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Default Hifonics Boltar VIII Problem

Hi, i have recently aquired an old hifonics boltar that has a problem with drawing current only when power is applied to the remote terminal, changed out all 10 IRFZ44N mosfets in the power supply, also checked all of the 220ohm gate resistors all were within tolerance, also all output devices and drivers checked good, attached is a picture of the amplifier only the power supply fets on towards the top of the picture get warm the others are cool, amp did the same thing before i changed all the fets in the power supply i have more pics of scope readings and power supply pics of when amp is on
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File Type: jpg img_03ttrtr50.jpg (73.8 KB, 208 views)
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Old 17th February 2008, 03:25 AM   #2
vypr is offline vypr  United States
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here is a pic of the scope reading set at .2 volts and 50uS scope probe set at x1 taken of the leg of the first rectifier on the side of which the fets get hot
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Old 17th February 2008, 03:28 AM   #3
vypr is offline vypr  United States
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heres a pic pf the power supply when power is applied to the remote terminal normally is at 13.8 volts
thanks for all your help
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Old 17th February 2008, 04:20 AM   #4
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Can you post photos of the gate signal (on the gate leg of the FET) for each bank of FETs (1 photo/bank)?

If possible, also post photos of the drive signals on the base of the driver transistors.
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Old 17th February 2008, 10:36 AM   #5
sdoom is offline sdoom  Germany
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If the Boltar is equipped with SGSD100 and SGSD200 check them with an ohmmeter. I once worked on a VIII - Zeus and the SGSD200 had failed. The SGS are part of the power supply. If they have a short you might have trouble finding the SGSD. The company audiodesign (distributor in Germany) fixes the Series VIII amplifiers with "self made" SGSD100 / 200. transistors. They make their own darlingtons with TIP102+TIP35C (replaces SGSD100), TIP107+TIP36C (replaces SGSD200).

If there was no other source , you can get the SGSD100 here

http://bg-electronics.de

and the SGSD200 here:

www.conrad.com


You may also check the output sinal of the TL594 , as in a Pluto repair the TL594 had gone bad and didnīt provide both output signals. the TL594 is located on the small sub-board next to the transformer.
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Old 17th February 2008, 09:52 PM   #6
vypr is offline vypr  United States
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I checked SGSD100 and SGSD200 both sets are good
perry i have photos of the gate signals of both banks starting with the top bank with respect to the first pic i posted all with scope set at 50uS and 1 VOLTS/DIV probe set on x1
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Old 17th February 2008, 09:53 PM   #7
vypr is offline vypr  United States
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heres the gate leg of the bottom bank
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Old 17th February 2008, 09:56 PM   #8
vypr is offline vypr  United States
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heres the photos of the drive signals starting with top one first
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File Type: jpg base drive top bank.jpg (35.6 KB, 107 views)
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Old 17th February 2008, 09:57 PM   #9
vypr is offline vypr  United States
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now the base of the bottom driver transistor, all this was done with a 4 ohm dummy resistor in series with the 13.8 volt supply to limit current
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Old 17th February 2008, 11:08 PM   #10
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Pull the driver transistor (2SD1292?) and check it. If it's OK, the output transistor of the TL594 may have failed. Check the drive signal on pins 9 and 10 of the 594 with the driver transistor out of the circuit. It should look more like the drive signal you have on the bottom bank of FETs.


If you pull both driver transistors, the voltage drop through your 4 ohm resistor should be much less and should allow the drive signal to swing to ~12v. The low voltage (caused by the 4 ohm resistor) could be causing the driver IC to go into shutdown. If you have two 4 ohm resistors, connect them in parallel to allow more voltage at the amp.
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