While powered and intended to pulse, check voltage between G and the other side of the closest resistor, R4.
(this is pin three, but you are less likely to short against pin 2 or 4 accidentally.
I - If this voltage pulses, then the board is good except for the power transistor... remove it and the resistor, solder a wire into the hole of the resistor nearest the G terminal and run to your SSR...
II -if this voltage does not pulse, check voltage between pin 1 and pin 4 directly on the 555
(this is pin three, but you are less likely to short against pin 2 or 4 accidentally.
I - If this voltage pulses, then the board is good except for the power transistor... remove it and the resistor, solder a wire into the hole of the resistor nearest the G terminal and run to your SSR...
II -if this voltage does not pulse, check voltage between pin 1 and pin 4 directly on the 555
a - if no voltage, find break or short
b - if voltage, check voltage between pin 2 and pin 4 with the POT turned in a few different positions
b - if voltage, check voltage between pin 2 and pin 4 with the POT turned in a few different positions
1 - if voltage is variable, replace 555 and/or cap
2 - if voltage does not vary, check for open/break near POT and R2,R3
2 - if voltage does not vary, check for open/break near POT and R2,R3
a - remove pot and test/replace
b - if still not fixed, buy a new kit and have a high school electronics kid assemble for you...
b - if still not fixed, buy a new kit and have a high school electronics kid assemble for you...