5
6. Does the pedal pass audio when the bypass LED is ON and the DEPTH knob fully counter clockwise?
If not...
A. If not, are the jumpers soldered correctly, as in the pictures on page 48 of the assembly
manual? I can’t tell you how many times people solder these wrong or not at all (...are we not
communicating something clearly enough?).
B. Are the DIP switches set properly (or at all)?
C. Is the isolation paper is under the pots? Make sure there are not holes in it and nothing is able
to poke through to short out against the pots.
D. Are the voltages of U2 correct? ...See the U2 VOLTAGES section.
E. Is the relay silencing circuit working correctly?
I. Check for 5V on R28 (see PCB voltage graphic)
II. Are the components of this circuit soldered and installed correctly? Check R27, R28, R29,
Q3, C18, C17, R33. Make sure that Q3 and C18 are not reversed, and the pads of C17
and C18 are not bridged.
7. Can you hear the tremolo effect working when the bypass LED is ON and the DEPTH knob fully
clockwise?
A. Is the relay properly switching the signal path?
I. With the bypass LED OFF, check for continuity between the tip of the input jack and the
tip of the output jack.
•
Check for good solder joints on the input and output jacks.
•
Check for good solder connections on all the relay associated components...D1, D2,
Q4, Q5, R31, R32, and RL1. Also make sure D1, D2, Q4, and Q5 are installed in the
correct orientation.
II. With the bypass LED ON, check for continuity between the tip of the input jack and
R1, and also continuity between the center lug of the VOLUME pot to the tip of the
output jack (see “Relay Test Points” graphic). If you don’t have continuity between either
of these connections, there is a problem with the relay circuit. Is the tip of the input jack
staying connected to the tip of the output jack, depsite the status of the bypass LED? If so
this means the relay is not swtiching.
•
Are you able to hear the relay “click” when the bypass foot switch is pressed? If not, check
for good solder joints and correct orientation on the relay associated components... D1,
D2, Q4, Q5, R31, R32, and RL1.
•
Make sure the microcontroller is seated firmly in it’s socket
Summary of Contents for QUAK
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