Hello ,Im working on this amp and need some help .
-The red light is on (no relay click, no sound ).
-If l remove QS1 or QK1 (green marks on picture) the amp gets out of protection and it works (clean sound ,no overheating ) ,so i think the output section is fine .
-I found a bad transistor on the back of the smaller board QK3 (red mark on picture), l did some research but i couldn`t find the part number, maybe someone here can help me identify this part.
Thanks in advance!
-The red light is on (no relay click, no sound ).
-If l remove QS1 or QK1 (green marks on picture) the amp gets out of protection and it works (clean sound ,no overheating ) ,so i think the output section is fine .
-I found a bad transistor on the back of the smaller board QK3 (red mark on picture), l did some research but i couldn`t find the part number, maybe someone here can help me identify this part.
Thanks in advance!
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I took it out of the board and checked with my DMM and the only reading I get is 1.106 (diode mode) with negative test prove on center pin and red one on the right pin.I get nothing using other combinations ,thats why i assume is bad, unless this is a special type of transistor.
Thanks Perry, i just checked resistance between Pin 1 and 2 ,I get about 20K ohms ,so this is a KRC102S ,at least is not shorted and internal resistors are still ok .Ill keep looking to find out what is triggering the protection circuit.
Post the DC voltage on all pins of the 8-pin IC on the power supply driver board if you need help tracking down the problem.
Reinstall QS1 and alternately remove RS1 and RS3. Which of those two, when out of the circuit, allows the amp to power up?
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