Noise section problem RESOLVED
Posted: Mar 28th, '16, 16:47
Hello everybody.
My problem with the noise section still present with the mods (in the manual p15) or without.I change the OP amp, changes nothing.
I have +14,4V at pin 8 and -14,97V at pin 4 and +13,8OV at pin 1 (but in DC mod) when the IC is in position (+15,08V and -15,1V with no IC). No regular result with pin 1 in AC mod.
I check and test all the parts, the welds... no problem from this side (both capacitors have result up to their writing, the 18nF have a result of 35nF and the 39nF have a result of 54nF), I test the 2SC828 with my hFE tester the result is 260 and I have 13,8V in DC mod at pin1 without the 828 and 8,4V with it (I make a test with a 2SC945, same result).
When I modify TM4 nothing is happening.
My power supply send 17,80V (AC mod).
With no power on the board I have 100 Ohms at pin 4 and pin 8 of IC U24.
My multimeter: Mastech MS8240B.
So if you can give me an advice to find the problem it will be cool.
My problem with the noise section still present with the mods (in the manual p15) or without.I change the OP amp, changes nothing.
I have +14,4V at pin 8 and -14,97V at pin 4 and +13,8OV at pin 1 (but in DC mod) when the IC is in position (+15,08V and -15,1V with no IC). No regular result with pin 1 in AC mod.
I check and test all the parts, the welds... no problem from this side (both capacitors have result up to their writing, the 18nF have a result of 35nF and the 39nF have a result of 54nF), I test the 2SC828 with my hFE tester the result is 260 and I have 13,8V in DC mod at pin1 without the 828 and 8,4V with it (I make a test with a 2SC945, same result).
When I modify TM4 nothing is happening.
My power supply send 17,80V (AC mod).
With no power on the board I have 100 Ohms at pin 4 and pin 8 of IC U24.
My multimeter: Mastech MS8240B.
So if you can give me an advice to find the problem it will be cool.
