Symetrix 628 Digital Voice Processor, Руководство пользователя

Страница: 23 / 38

628
21
5.) Verify that the 628’s output level is correct for the mixer input level. Are you feeding a
line level signal into a preamp input? If so, convert one of the 628’s XLR outputs to
microphone level. See Appendix C.
6.) Is the PHANTOM LED on? Use phantom power only with BALANCED (3 conductors
on the plug) condenser, or electret, microphones.
7.) Check the source audio quality with another device. “Garbage in” equals “garbage
out.”
Noise in the form of hiss.
1.) Check the input signal level. Is the GAIN control set between 9:00 o’clock and 12:00
o’clock? Is the -15 DB PAD button in the out position?
2.) Check the equalizer section for large amounts of boost (+10 dB, or more) above 1 kHz.
3.) Do the compressor LEDs display large amounts of compression?
4.) Check the digital gain by turning the OUTPUT LEVEL knob until one click is felt. The
MASTER display should show “0.” If not, turn the knob for a “0” reading.
5.) Verify that the 628’s output level is correct for the mixer input level. Are you feeding a
line level signal into a preamp input?
6.) Check the source audio quality with another device. “Garbage in” equals “garbage
out.”
No processing action.
1.) Verify that the processing stage (de-esser, expander, compressor or equalizer) is
activated. The ACTIVE LED associated with that stage must be on.
2.) Are you trying to modify one of the factory presets? Presets 120-127 are read-only; you
must move the program to another location before you can modify it. Check Chapter 3
for instruction on moving presets to new locations.
3.) Check the RATIO control. Low ratio settings, 2:1 or less, produce very little processing
action. Read Chapter 4 on audio processing theory.
4.) Check the THRESHOLD control value. No processing takes place until the signal level
passes the threshold. Is your threshold set too high? Review Chapter 4.
5.) Are you in the bypass preset? The MASTER display will read "byP". This is a read-
only preset with no processing and flat equalization.
The SAVE button does not operate. I cannot save changes to a preset.
1.) Are you trying to make changes to a factory preset (#120-127)? These are read-only
programs; you cannot change them. To change a factory preset, copy the preset to
another location and then the 628 will let you modify the program.
2.) Are the front panel controls locked out? See Chapter 3 for the lockout instructions.
The MASTER display shows a value outside of the normal operating limits.
1.) If a program buffer of a processing preset becomes corrupted the MASTER display will
try to display the erroneous value. For example: The equalizer CUT/BOOST value may
read “-99” in the MASTER display. This is outside of the equalizer's normal range.
Turn the CUT/BOOST control until a value between -15 and +15 is displayed. Next,
push the SAVE button twice. This should correct the problem.