Eventide Ultra-Harmonizer H3000 Service Manual page 10

SERVICING THE H3000
This manual is intended to be used as a relerence for the qualified technician
tesponsible for repairing, maintaining and updating professional audio equipment. Printed
circuit boards and integrated circuit chips are unfortunately often victims of abuse from well
intended soldering irons. Heat and static electricity are too often responsible for electronic
troubles. Extreme care should be used when working within the H3000. Refer repairs to a
qualified service person whenever possible.
CONFIRMING А PROBLEM
Typical of most good trouble shooting techniques is being able to confirm and
identify a problem and its symptoms before effecting any solutions. With a device as
complex as the H3000 there are many occasions when operator error, wiring mistakes or
faulty installation account for what was thought to be a device breakdown. The H3000
Owner's manual is the best place to start.
A thorough under-standing of the operator's manual will avert many operator error
conditions. Н the device is passing processed audio signals, displaying correct information
on the front panel and reacting to the buttons and knob in most cases the H3000 is
working properly.
A good understanding of differentially balanced inputs and outputs will take
care of most wiring mistakes.
Faulty installations can be anything from bad audio connections, low ac line
voltage or improper ventilation. The H3000 will get very hot if the top and
bottom vent siots are blocked by other devices or the unit is in a sealed road
case. Overheating in this way will have the effect of "crashing" the audio in
time or "locking up" the front panel.
Some words about "crashing" the audio are certainly in order here. The entire unit
relies on the two main address and data busses. If any component of the system fails
(meaning any digital chip) the entire system could crash or at the very least the audio could
be turned to noise and distortion. When the program running is a basic delay or a non-
shifted Harmonizer and the audio output is not any facsimile of the input the audio has
most likely "crashed". This is effectively random noise generated by such things as bus
contention, wrong timing or no timing at all. Don't be overly concerned with the quality or
level of this noise. It will change with different programs.
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