Symetrix 628 - Chapter 5 Solutions to Possible Problems; Audio Output Issues; Signal Integrity Problems

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No analog output signal.
1.) Verify that the 628 is receiving AC power. Check the MASTER display for a reading.
2.) If not, try another device at that outlet or power strip.
3.) Have you selected the correct input source at the MIC/LINE switch?
4.) Does the MASTER headroom meter show signal presence?
5.) If not, check the input cables and connections.
6.) If the 628s LED meter is active, check the output cables and connections.
7.) Verify that you are not connecting a microphone level output to a line level input.
8.) Have you connected a digital output to an analog input?
No digital output signal.
1.) Verify that the 628 is receiving power. Check the MASTER display for a reading.
2.) Does the MASTER headroom meter show signal presence?
3.) If not, check the input cables and connections.
4.) Have you selected the correct input source at the MIC/LINE switch?
5.) If the 628s LED meter is active, check the output cables and connections.
6.) Is the rear panel digital output format in the proper position? Does your digital input
want AES/EBU or S/P DIF?
7.) Is the rear panel SAMPLE RATE SELECT switch in the proper position? It must reflect
the sample rate of the digital recorder, workstation, etc.
8.) Do you have the digital output of the 628 connected to a digital input?
Hum or buzz in the audio.
1.) Verify that you have seated all connectors firmly.
2.) Try substituting input and output cables. Were testing for a broken connection in a
cable.
3.) Is all equipment in the system properly grounded? There may be a ground loop
between units. This occurs when a voltage difference exists between grounds.
Ground is not always ground.
4.) Is all equipment connected to the same AC ground? Plug all into the same power strip.
Distorted audio.
1.) Does the CLIP LED in the microphone preamp light? If so, turn down the GAIN control
or push in the 15 dB PAD switch.
2.) Does the MASTER headroom meter show clipping? Possibly the equalizer is clipping.
Turn down any large amounts of EQ boost.
3.) Does the MASTER headroom meter still show clipping; all LEDs lighted. If so, check
the MASTER OUTPUT LEVEL control for a large amount of digital gain, or lower the
input signal at the preamplifier.
4.) Bypass all processing functions one at a time; the ACTIVE LED will be off. If this
clears the distortion, check the program parameters for unusual or extreme settings.
Solutions to Possible Problems Chapter 5