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Rodek r2180a and protect
Rodek r2180a and protect
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Old 24th December 2017, 09:00 AM   #11
mladenke is offline mladenke
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Join Date: Dec 2017
Location: Serbia
Ok. i put it in car and its run fine. To get 494 voltage while in protect directly in car will be a problem becouse of small space in trunk, so i hope that amp will run fine. If it do, i need some power supply with 14v becouse on 12v its working normal.

Tnx perry, i'll report results.
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Old 24th December 2017, 11:17 AM   #12
mladenke is offline mladenke
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Join Date: Dec 2017
Location: Serbia
And what i forget to say, phase control was apparently bad soldered, becouse all 8 legs of phase control, if i remeber right, have shorts between solder on board. Someone change phase control switch and do it bad.
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Old 24th December 2017, 03:09 PM   #13
mladenke is offline mladenke
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Join Date: Dec 2017
Location: Serbia
Ok. amp works well in car on 12v and 14v. Then sudenly go to protect on 12v and same one 14v. Pull amp from car and put in power suply and have this messurement:

tl494 on 12v and protect
pin1 1.27v
pin2 4.05v
pin3 4.70v
oin 4 0v
pin 5 1.46v
pin6 3.29v
pin7 0v
pin8 10.98v
pin9 0v
pin10 0v
pin11 10.98v
pin12 11.71v
pin13 4.94v
pin14 4.94v
pin15 4.94v
pin16 7.14

Voltage on speaker terminals are 0.04v, messured on + and - speaker terminals.
Voltage on power fets 12v
voltage on positive and negative rectifiers are 0.54 and 0.12v
Voltaage on transistors are same as on rectifiers.

So what can be my problem?
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Old 24th December 2017, 03:54 PM   #14
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
The attached diagram is similar in layout but the designations and values are different.

The first thing you need to be able to do is to make it go into protect reliably. Otherwise, disabling the protection circuit may not help much.

To disable the protection circuit, find and remove the equivalent of R25 from the circuit.

Do whatever you did to force the amp into protection. Does it work perfectly doing whatever you did to cause it to go into protect or does it malfunction in some way when it would normally be in protect?
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File Type: pdf rodek_ACR_R680A_12_09_02.pdf (628.0 KB, 36 views)
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Old 24th December 2017, 04:18 PM   #15
mladenke is offline mladenke
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Join Date: Dec 2017
Location: Serbia
it wont go to protect now on the bench.
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Old 24th December 2017, 04:25 PM   #16
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
Reinstall that resistor.

Look at the diagram. Find the equivalent of R375 and R475 in the two output channels. Remove one at a time to see if you can tell which channel is driving the amp into protect mode.
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Old 24th December 2017, 07:19 PM   #17
mladenke is offline mladenke
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Join Date: Dec 2017
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if i do it right its a r256 and r155 on my board. With r155 removed, no protection, only strange sound from the speaker. With r256 removed i got protection mode. Same with r154 and r255. So, with removed r256 i got protection. Same with r154. Thats resistors are for negative channel.
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File Type: jpg IMG_20171224_211413.jpg (966.4 KB, 21 views)

Last edited by mladenke; 24th December 2017 at 07:47 PM.
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Old 24th December 2017, 08:11 PM   #18
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
Are you sure that the corresponding parts in each channel aren't the same except for the first number after the R?
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Old 24th December 2017, 08:29 PM   #19
mladenke is offline mladenke
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Join Date: Dec 2017
Location: Serbia
yes. i got protected mode from resistor r 154. if i folow trace from resistor r254 it will go to mps 160 transistor and then to smal box with screw for adjustment. I dont know what is it.

si its 154 and 255 on my board. both negative on each side of board.
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Old 24th December 2017, 08:38 PM   #20
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
Are the transistors connected to those resistors marker 4403?
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