So what is the "Panasonic power supply issue"?

[dishdude]

Originally Posted by starbond

The only reason I say may is because i found about a dozen pf these tiny strands of tape inside the transport area, its slightly possible one shredded into the gap on the video head while spinning, I really hope
its not a blown head. But i have only put $10 into this unit at this point so if it turns out the head it dead then at least it was a learning experience how to troubleshoot a power supply
Attachment 203934

It looks like something is misaligned in the tape path and shaving the tape off!

[starbond]

Originally Posted by dishdude

It looks like something is misaligned in the tape path and shaving the tape off!

Its possible, but hopefully not.

Q4 arrived today, put it in the circuit and it STILL blows.
I tested diodes 1-5 on the circuit as well as Q1 and q2 which appeared to be still in spec
D1 is a bridge rectifier so its probably fine
D2 reads .5V forwards and OL reverse
D3 reads .6V forwards and 2V reverse
D4 reads .6V forwards and 2V reverse
D5 reads .6V forwards and 1.8V reverse
these were tested in circuit as the leads are so short, if i removed them i dont think id be able to get it back in.

[vortalexfan]

Originally Posted by starbond

Its possible, but hopefully not.

Q4 arrived today, put it in the circuit and it STILL blows.
I tested diodes 1-5 on the circuit as well as Q1 and q2 which appeared to be still in spec
D1 is a bridge rectifier so its probably fine
D2 reads .5V forwards and OL reverse
D3 reads .6V forwards and 2V reverse
D4 reads .6V forwards and 2V reverse
D5 reads .6V forwards and 1.8V reverse
these were tested in circuit as the leads are so short, if i removed them i dont think id be able to get it back in.

D3-D5 on your VCR appear to be bad, because on diodes they're only supposed to measure voltage one direction, and you're measuring voltage (albeit a very small amount) in both directions, which tells me that D3-D5 might be part of your problem (and possibly something for me to check on my VCR as well.)