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nasyo
Copper Member
Philippines
5 Posts |
 Posted - 03/19/2010 : 01:47:26
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it was a defective item when i bought it.
but the switching works fine.
so I download directly the schematics, then tried to pull out K30 transistors, tried to check it individualy with a tester. they were all good. and I still replaced them with new ones to make sure it's OK. redundant move.
then I checked. sill no octaves.
then I traced the circuitry, it could have been the flip-flops.
MN4013B and BA634
I bought MN4013BP, is it the same with MN4013B? i don't have datasheets for this old Dual D-Type Flip-flops.
But still, no octaves.
Now, i'm pulling all the dual op-amps, tried to checked it individually too. IR9022/555A and IR9022/556B they have a different reading in my tester. Are they the same?
I'm still researching about this 555A and 556B marks on the dual op amps. there's a 777 and 76C in the pictures. What's there difference? |
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OC-2 no octaves
