7. Test the
wet signal path B
with the signal test probe. BROWN 1 - 19 is the signal
path of the wet delayed signal from the output of the second delay chip to the R5/R6
junction where the wet and dry signals are mixed together before entering the output
buffer when the pedal is in normal echo mode, not pingpong mode. If the second delay
chip is receiving wet signal A at PIN16, but is not producing a further delayed
signal(delay time at output of chip B should be more than the delay time at the output of
chip A) at PIN14, then there is a problem with the chip. Make sure it's oriented correctly.
IF YOU ARE ONLY GETTING ONE REPEAT WHEN IN NORMAL ECHO
MODE:
Check BROWN 8 - 14. This is the feed backloop. The repeats knob is
essentially a volume knob within the feedback loop. It cuts the wet signal that goes back
to the input of the delay circuit. Each repeat that gets reduced in volume a little
everytime it passes through the feedback loop until there is no more signal left. Turning
it down counter clockwise cuts more signal, so the repeats decay faster. Turing all the
way counter clockwise allows no wet signal to feedback into the delay circuit, so you will
only hear one “slapback” repeat. Turning the repeats knob up clockwise cuts less signal
so the repeats will last longer. The wet delay signal of the delay chip is actually stronger
than the unity gain dry signal, so when you turn the repeats knob all the way up and cut
no wet signal, the wet signal will actually become amplified a litte more each time it
passes through the feedback loop. This is what creates self-oscillation.