Recent content by clk1981

Doing a diode check on my meter on TR722, I was getting some funky readings. .007V drop and 2.2V drop on the two junctions. I pulled TR722 and it oddly enough tested as a good PNP transistor. Weird. I went ahead and replaced it, and now the unit is powering on and working fine with the outputs...

Ok, I tested voltage on what I believe was R750 and R752 (service manual is blurry and the board is not labeled) and it looks like I had .3V I did find that with the outputs taken out of the right channel, the socket for the NPN output had these voltages (40V, -17.6V, .1V) and the PNP output...

Ok thank you so much. I won't be able to get back to this until monday but I will do what you suggested and report back. Thanks!

Thank you for the reply. I guess what I am confused about is if there were shorted components other than the outputs, how does the unit power on and give a relay click with just the outputs removed? Wouldn't the other shorted components cause the bulb to dim?

I have a beautiful CR-620 that HAD bad outputs. I replaced all 4 outputs with MJ21193/94 and recapped the power supply section. I used a dim bulb and powered it on. The unit was repaired and worked well for a few weeks... After running it for a few weeks, the main AC fuse (3.0A 250V) blew...

all fuses are good. I'm trying to get the amp board separated from the heatsink now...not much slack in the wires, this is gonna be a pain :)

1) -34V 4) 0V

Unit powers on, tuner meter works, however, the speaker relay never engages. All output transistors test ok, and the unit still doesn't have a relay click with the amp unplugged. Here are the power supply voltages I was hoping someone could help. 1) -34V 2-7) 0V 8) -34V 9) -.2V 10) -34V 11-15)...

J809 read 10.8V. No DBT tester being used now.

Ok, I checked the transistor voltages on the FM front end (100 board) and they seemed to all be there, although about 10% or so lower than the service manual. Here are some other voltages I measured. J205 - 1.4V J207 - 10.9V J210 - 10.9V J302 - 10.8V J304 - 38V J308 - 14.88V It looks like...

I didn't see the voltages stated in the service manual but I do remember seeing roughly 10VDC on a few pins.

I have a 2220 not a model B, that has no FM reception at all. I am thinking the problem is in the FM front end, but the board has no bottom access and I am not very good at rewinding tuner strings. Does anyone have any ideas where to look or what might be the cause? With an antenna hooked up...

I'm pretty sure I found the problem! Although the output transistors were not shorted, I pulled them, and BOTH of the NPN outputs (2SD586A) tested as a DIODE! Both of the PNP transistors are good. Whohoo!!! now off to finding some replacements. Thank you everyone for your input. Edit: YES! That...

after digging around all day, I am willing to bet the the problem is with the output transistors, as the headphone output is fine, and it is a resistive load from the outputs. Also, the output signal doesn't clip without speakers installed so its almost like the outputs are impedance...

this might be progress. Good signal on Q4, Q5, and Q6 On Q7 and Q8 I have a perfect sine wave on ONE of the legs, and on another, the bottom half of the sine wave is gone.