Derek92994's 700 Ser II White Oak conversion

[derek92994]

Not necessary, a non-essential part. What are you measuring now on the collector(tab) of Q1 (MJE15032)? Should be ~+100V

Reconnected D80
VR1 still 0v on all points.
Q1 measured 12.3 (right hand side pin)

 

[derek92994]

Middle Pin of Q1 101 volts, sorry Joe I have no idea sometimes

 

[Gepetto]

Middle Pin of Q1 101 volts, sorry Joe I have no idea sometimes

OK good, you have a voltage feed. Now how about the 20K resistor in location R85, both ends

 

[derek92994]

R85 - 100 Volts on one end 0 on the other

 

[Gepetto]

Is R85 any good? You will be able to tell because it will be on the upper side of warm

 

[derek92994]

Is R85 any good? You will be able to tell because it will be on the upper side of warm

THermal gun says rise of only 3 degrees over a minute or so

 

[derek92994]

R85 Looks slightly darker than the other one, I don't think its gone

 

[Gepetto]

R85 Looks slightly darker than the other one, I don't think its gone

Measure it with the power off...is Q1 any good? BCE measurements?

 

[derek92994]

Measure it with the power off...is Q1 any good? BCE measurements?

I finally found where my email notifications were going, should be able to reply faster now

R85 Measures 24 ohms, Rises to 25 Ohms after a minute or so. R85 Measures 0 volts with power off.

As for Q1, do you want me to measure it in volts or ohms and with power on or off?

 

[Gepetto]

I finally found where my email notifications were going, should be able to reply faster now

R85 Measures 24 ohms, Rises to 25 Ohms after a minute or so. R85 Measures 0 volts with power off.

As for Q1, do you want me to measure it in volts or ohms and with power on or off?

R85 should measure 20K, not 24 ohms.

Measure Q1 with the diode scale on your DMM

 

[derek92994]

R85 should measure 20K, not 24 ohms.

Measure Q1 with the diode scale on your DMM

I had the meter set to 200k range when I got 24 on the R85, not sure if this makes a difference.

Left hand pin of Q1 makes the multimeter beep and I get a value of 9
Middle Pin just says 1 (like its out of range of meter)
RIght hand side pin Says 1 also

 

[laatsch55]

Q1 is an NPN transistor. You are going to diode checvk each junction in that transistor, power off, Positive lead on pin 1 ( if the front is facing you with the pins down , far left is base) negative lead on pin 2, then pin 3. Should have around .600 volts DC on diode check...

 

[derek92994]

Q1 is an NPN transistor. You are going to diode checvk each junction in that transistor, power off, Positive lead on pin 1 ( if the front is facing you with the pins down , far left is base) negative lead on pin 2, then pin 3. Should have around .600 volts DC on diode check...

This is with power off?

 

[laatsch55]

Yes...

 

[derek92994]

555 and 561 (Q1)

 

[laatsch55]

Now, reverse the leads, same test.

 

[derek92994]

Seems those are both out of range on multimeter, leads reversed (Q1 Leads reversed)

 

[derek92994]

For your info, here is Q2 (Leads both ways, 4 tests)

 

[laatsch55]

Measure R85, one lead on each side..

 

[derek92994]

Measure R85, one lead on each side..

R85 is 20.5 ohms