when debugging...

[jlullo]

hey everyone.. i need to debug my ts-808, and i'm not really clear on getting the voltages.  so i clip the black lead to the ground, but when i'm measuring the voltages of the components, where am i touching the red lead to?  the solder pads?

[Processaurus]

yes, the solder pads, or the metal component legs, whichever is easier.  You are measuring the voltage difference between each of those points and ground.  For instance, on your opamp IC, looking at the top of it, you'd touch the red lead to each metal leg and record the voltage you're getting at each one.

[jlullo]

ok then, so for each resistor and cap i'll have 2 readings, trannys 3, etc?

[Processaurus]

Just do the active components, which are the transistors and the opamp IC.  So yeah it would be three readings for the transistors, and 8 for the opamp.  If you need to know how the pins are named/numbered, you can look up the parts manufacturer datasheet at alldatasheet.com

[jlullo]

thanks a lot!

[petemoore]

ok then, so for each resistor and cap i'll have 2 readings, trannys 3, etc?
  Caps...ya just figure they work, I test with the other cap I know works, swapping it as last resort sometimes.
  Resistors...check across the resistor for a resistor value, mainly when having a bias problem...check the bias resistors for value, and that they're actually connected, this can be done by say...[for a resistor connected to t ground] connecting to 'another' ground instead of the resistor lead, this way you read the resistor 'through' it's connection to the grounds.