DigiPete Posted September 10, 2008 Report Share Posted September 10, 2008 I want my Pearl Phono trannies Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted September 10, 2008 Author Report Share Posted September 10, 2008 I want my Pearl Phono trannies they'll be done today Quote Link to comment Share on other sites More sharing options...
DigiPete Posted September 11, 2008 Report Share Posted September 11, 2008 they'll be done today :prettyprincess: Quote Link to comment Share on other sites More sharing options...
swt61 Posted September 11, 2008 Report Share Posted September 11, 2008 I want my trannies Fixed! Quote Link to comment Share on other sites More sharing options...
DigiPete Posted September 11, 2008 Report Share Posted September 11, 2008 Fixed! Wrong part number Quote Link to comment Share on other sites More sharing options...
DigiPete Posted September 11, 2008 Report Share Posted September 11, 2008 Toshiba... Quote Link to comment Share on other sites More sharing options...
DigiPete Posted September 12, 2008 Report Share Posted September 12, 2008 they'll be done today Any luck finishing those transistors Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted September 12, 2008 Author Report Share Posted September 12, 2008 Any luck finishing those transistors yes, I need to find your address and take them to the post office. I'm a bit behind on the rest ... Quote Link to comment Share on other sites More sharing options...
DigiPete Posted September 16, 2008 Report Share Posted September 16, 2008 Well, I soldered in the final transistors from Marc today, and..... the circuit not measuring right, no workie.... I will need trouble shooting assistance:mikey2: Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted September 16, 2008 Author Report Share Posted September 16, 2008 okay. voltage across R2? voltage after regulator (R8)? did you install R27 (47k)? voltages at all three legs of Q5 and Q3 (ok, and Q4)? edit: referenced to ground are both boards not working? verify all resistor values. Quote Link to comment Share on other sites More sharing options...
DigiPete Posted September 16, 2008 Report Share Posted September 16, 2008 input voltage from big cap 46.8 volts (don't know if too high an input voltage can screw the circuit) across R2 .08v at regulator input 46.7v at output 30.7v at zener 9.45v R27 47k is in voltages at Q3, Q4 and Q5 are where it really gets fucked up.... stand by Quote Link to comment Share on other sites More sharing options...
DigiPete Posted September 16, 2008 Report Share Posted September 16, 2008 Q3 30.6v, 26.68v, 30.3v the Q4 and Q4 base voltages are near 29v Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted September 16, 2008 Author Report Share Posted September 16, 2008 Q3 30.6v, 26.68v, 30.3v the Q4 and Q4 base voltages are near 29v for Q3 you should have around 0.6V across the base-emitter junction. You didn't identify which reading was which leg.... I'm going to guess the collector is at 30.6v (based on the output of the psu regulator voltage) in which case something is wrong here. Verify R13 and R16 are the proper values and R13, R16, Q3 are soldered properly. If you have a diode check function on your meter, verify that you are getting a diode drop across base-emitter, but I'm guessing this critter is bad. Also, did you remember to solder in the shorty to connect the top and bottom ground planes? Quote Link to comment Share on other sites More sharing options...
DigiPete Posted September 16, 2008 Report Share Posted September 16, 2008 Q3 30.6v, 26.68v, 30.3v the Q4 and Q5 base voltages are near 30v So is the voltage at the transistor quad and output cap... The resistors are all correct, and I ohmed them out before install. After building an M Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted September 16, 2008 Author Report Share Posted September 16, 2008 So is the voltage at the transistor quad and output cap... have you assembled the second board? (i.e. do you have some extra parts laying around?) Quote Link to comment Share on other sites More sharing options...
DigiPete Posted September 16, 2008 Report Share Posted September 16, 2008 f Also, did you remember to solder in the shorty to connect the top and bottom ground planes? huh ? Where is this on the board. Could this be the cause of my bad readings? Quote Link to comment Share on other sites More sharing options...
DigiPete Posted September 16, 2008 Report Share Posted September 16, 2008 have you assembled the second board? (i.e. do you have some extra parts laying around?) The second board is assembled, but I did not put in the transistors you sent, until I debug this board Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted September 16, 2008 Author Report Share Posted September 16, 2008 huh ? Where is this on the board. Could this be the cause of my bad readings? heh.. check out the silk screen near C15. Quote Link to comment Share on other sites More sharing options...
DigiPete Posted September 16, 2008 Report Share Posted September 16, 2008 heh.. check out the silk screen near C15. Ok, I see a jumper hole near C15. I guess I didn't read the big print right there Do you think that is likely my issue? Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted September 16, 2008 Author Report Share Posted September 16, 2008 heh, I just looked at your pics.. it's not populated. Dew eet! It's from the negative terminal of C15 to the hole that's right below C15. You can see an arrow pointing to a white line on the top of the silk even when C15 is installed. The text is "behind C15". This the negative of the caps will be connected to that empty hole, and hence the top ground plane. Quote Link to comment Share on other sites More sharing options...
DigiPete Posted September 16, 2008 Report Share Posted September 16, 2008 I'm the typical engineer: When all else fails.... read the directions Quote Link to comment Share on other sites More sharing options...
DigiPete Posted September 16, 2008 Report Share Posted September 16, 2008 Darn! Now I have to sit here at work all day..... Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted September 16, 2008 Author Report Share Posted September 16, 2008 Darn! Now I have to sit here at work all day..... amateur. check out my board pic I posted and zoom in, you'll see what I'm talking about. for everyone else the easiest way to install this is just bend the leg from the capacitor over before you clip it and solder it in. Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted September 16, 2008 Author Report Share Posted September 16, 2008 Darn! Now I have to sit here at work all day..... you look like you may not be feeling well? wait, is that the baby I hear? Quote Link to comment Share on other sites More sharing options...
DigiPete Posted September 16, 2008 Report Share Posted September 16, 2008 you look like you may not be feeling well? wait, is that the baby I hear? Yes! the wife needs to take her into the doctor's office, so I have to sit the other kids I am an amateur!! Aero Engineer, so I have enough electrical knowledge to be dangerous Does R27 always remain as 47K, or do you change it based on resistor load reqmt for the cart? Or is it that if you parallel in a 100ohm, the 47k ohm becomes insignificant and the total resistance is essentially 100ohm? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.