Derek92994's 700 Ser II White Oak conversion

[derek92994]

Yep, got em out, will test first one and post results to ensure i do all 6 tests correctly

 

[derek92994]

Ok I tested the first output:

B- to E+ 516
B- to C+ 510
E- to C+ no value
B+ to E- no value
B+ to C- no value
E+ to C- no value

How does this look?

 

[laatsch55]

That's good Darc, sorry I'm late here...I'll be watching now..

 

[derek92994]

2 more to test, number 4 has shorts, will post all results shortly

 

[derek92994]

All outputs measure the same except for number 4 which is:
B- to E+ 502
B- to C+ 502
E- to C+ Short
B+ to E- no value
B+ to C- no value
E+ to C- Short

 

[laatsch55]

So, you have an emitter to collector short.

Now, while those are out, check all emitter resistors, the big, light brown ones, one per output... Should be .33 ohms, your meter may not measure sub ohm accurately, but that's Ok, we're looking to make sure they are not open or shorted...

 

[laatsch55]

Is #4 the 4th from the bottom?

 

[AngrySailor]

I’m following intently...

 

[derek92994]

You mean the grey ones that say 0.33ohms-j?

 

[laatsch55]

Yes Darc....

 

[derek92994]

From top to bottom so 4th one down

 

[derek92994]

All emitter resistors 0.7

 

[laatsch55]

Good.. now do the Base to Emitter test on the empty sockets..

 

[derek92994]

All sockets B to E cause meter to beep and show value of 15 except very bottom one which does not beep and shows 211

 

[laatsch55]

On resistance correct?

 

[derek92994]

Thats on diode setting, do you want ohms?

 

[laatsch55]

Yes..

 

[derek92994]

All sockets measure 10.7 except very bottom one which is 180

 

[laatsch55]

What we did there was eliminate any other short that might be present. Good news there bud.

Collateral damage can occur on the board with a blown output. a LOT LESS chance with the WO boards but it can happen. Bless you for not keep putting in fuses after the first blow, that can cause additional problems.

So, do the BE,BC, Ec checks on the TO-220 pre-driver trannies on the bottom of the right side of the board, you'll get some weird readings on the reverse tests but we're looking for shorts or opens is all, in diode mode. Base on those 220's is left pin when pins are down and writing is toward you..

 

[derek92994]

Are we still on backplanes or have we moved to control board?