Hi guys
Amp is not in protect. Draws 1A at idle. No class D switching at all even with RCA signal and the output mosfets in.
New LM393, new IRS2184S, all new MMBTA92 + MMBTA42 transistors on the driver board, new gate drive diodes, D15,D18,D101 which are the small 3 diodes on the driver board - 1SS355TE - reads fine.
Exact driver board is also used in Orion HCCA-D2400.
IRS2184S pinout:
1 - square wave same freq as the injected signal thru the RCA
2 - 2.63v above neg rail
3 - neg rail
4 - neg rail
5 - neg rail
6 - 0v
7 - 0v
8 - 0v
I haven't changed the two optocouplers KPC117 as I can't find them in my country. Have not checked D102 - 1N5227.
I do have the schematics for the amp, but the driver board is missing there.
Can't figure out why the driver is not turning on.
Any ideas would help. Will provide the schematics if needed.
Amp is not in protect. Draws 1A at idle. No class D switching at all even with RCA signal and the output mosfets in.
New LM393, new IRS2184S, all new MMBTA92 + MMBTA42 transistors on the driver board, new gate drive diodes, D15,D18,D101 which are the small 3 diodes on the driver board - 1SS355TE - reads fine.
Exact driver board is also used in Orion HCCA-D2400.
IRS2184S pinout:
1 - square wave same freq as the injected signal thru the RCA
2 - 2.63v above neg rail
3 - neg rail
4 - neg rail
5 - neg rail
6 - 0v
7 - 0v
8 - 0v
I haven't changed the two optocouplers KPC117 as I can't find them in my country. Have not checked D102 - 1N5227.
I do have the schematics for the amp, but the driver board is missing there.
Can't figure out why the driver is not turning on.
Any ideas would help. Will provide the schematics if needed.
Attachments
HERTZ EP1D Service Manual download, schematics, eeprom, repair info for electronics experts
page 7 is the driver board (or a similar one).
Shouldn't you have 12v above the negative rail on pin 5 of the 2184?
page 7 is the driver board (or a similar one).
Shouldn't you have 12v above the negative rail on pin 5 of the 2184?
Once again IRS2184S pinout:
1 - square wave same freq as the injected signal thru the RCA
2 - 1.83v above neg rail
3 - neg rail
4 - neg rail
5 - 1.8~2.2v above neg rail.
6 - 0v
7 - 0v
8 - 0v
So there is no +12v above neg rail to feed the irs. But IC21 (LM317) + IC22 (LM337) are giving out stable 12.5v.
I will try to trace the +12v above neg rail line along its way.
Schematics can be found here:
FOCAL FP POWER AMPLIFIER Service Manual download, schematics, eeprom, repair info for electronics experts
1 - square wave same freq as the injected signal thru the RCA
2 - 1.83v above neg rail
3 - neg rail
4 - neg rail
5 - 1.8~2.2v above neg rail.
6 - 0v
7 - 0v
8 - 0v
So there is no +12v above neg rail to feed the irs. But IC21 (LM317) + IC22 (LM337) are giving out stable 12.5v.
I will try to trace the +12v above neg rail line along its way.
Schematics can be found here:
FOCAL FP POWER AMPLIFIER Service Manual download, schematics, eeprom, repair info for electronics experts
Okay. Issue was in a bad D215, 1N4744 ZENER Diode which is tied to pin 5 of the IRS and Tip41C transistor. Changed it and it works now, but the relay won't engage. Tested the relay manually and confirmed it works.
Q3 - which suppose to engage the relay (it's a 2sb1260) tested fine but something else is not ok in this circuit:
Q3:
B - 11v
C - 11v
E - 0v
Q3 - which suppose to engage the relay (it's a 2sb1260) tested fine but something else is not ok in this circuit:
Q3:
B - 11v
C - 11v
E - 0v
