800R
Appendix A: Service Information
ONYX
Warranty Service
Details concerning Warranty Service are spelled out in the Warranty section on page 23.
If you think your Onyx preamp has a problem, please do everything you can to confirm it before calling for service. Doing so might save you from the deprivation of your Onyx preamp and the associated suffering.
These may sound obvious to you, but here are some things you can check. Read on.
Troubleshooting
No Power
•Our favorite question: Is it plugged in?
•Make sure the power cord is securely seated in the IEC socket [25] and plugged all the way into the AC outlet.
•Make sure the AC outlet is live (check with a tester or lamp).
•Is the POWER [10] switch on? Make sure the POWER switch on the front panel is in the ON posi- tion (up).
•Are any LEDs on the front panel illuminated? If not, make sure the AC outlet is live.
•Are all the lights out in your building? If so, contact your local power company to get power restored.
•If there are no LEDs illuminated on the front panel, and you are certain that the AC outlet is live, it will be necessary to have your Onyx 800R serviced. There are no user serviceable parts inside. Refer to “Repair” at the end of this section to find out how to proceed.
Bad Channel
•Is the LINE switch [2] in the correct position?
•Is the input GAIN control [1] for the channel turned up?
•Is the signal source turned up? Make sure the signal level from the selected input source is high enough to light up some of the INPUT meter [7] LEDs for that channel.
•If it is channel 7 or 8, make sure the
•Try the same source signal in another channel, set up exactly like the suspect channel.
Bad Output
•If it’s the BALANCED LINE LEVEL OUTPUT [17], make sure the DB25 connector is correctly wired (see Appendix B: Connections).
•If it’s the OPTICAL OUT [18], make sure the optical cable isn’t kinked or damaged, and that the connec- tors are securely seated at both ends.
•If it’s the AES/EBU OR S/PDIF OUT [21], make sure the DB25 connector is correctly wired (see Appendix B: Connections). Determine if the device to which the Onyx 800R is connected is operating in SINGLE WIRE or DUAL WIRE mode. Make sure the buttons above the AES/EBU OR S/PDIF OUT connector are in the correct positions.
Bad Sound
•Is the input connector plugged completely into the jack?
•Is it loud and distorted? Make sure the input GAIN control for the channel is set correctly. Reduce the signal level on the input source if possible.
•Are the Onyx 800R and the device to which it is connected locked to the same clock rate? If the Onyx 800R is operating on its own internal sample rate, make sure the device to which it is connected is set to external clock and is locking to the word clock either through the OPTICAL or the AES/EBU OR S/PDIF connections. If the Onyx 800R is set to EXTERNAL clock, make sure the LOCK LED is lit.
•If possible, listen to the signal with headphones plugged into the input source device. If it sounds bad there, it’s not the Onyx causing the problem.
Noise/Hum
•Turn down each channel, one by one. If the noise disappears, it’s coming from whatever is plugged into that channel.
•Check the signal cables between the input sources and the Onyx. Disconnect them one by one. When the noise goes away, you’ll know which input source is causing the problem.
•Sometimes it helps to plug all the audio equipment into the same AC circuit so they share a common ground.
•Make sure you are using shielded cable designed for digital audio transmission, like Belden 7880A.
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ONYX 800R
