System Will Not Pass Emergency Alert System ("Eas" Usa Standard) Tones At The Legally Required Modulation Level; System Receiving 8500S's Digital Output Will Not Lock; You See A "Communications Board Error" Message; 19 Khz Frequency Out-Of-Tolerance - Orban OPTIMOD-FM 8500S Operating Manual

5-6
TROUBLESHOOTING
System Will Not Pass Emergency Alert System ("EAS" USA Standard) Tones at the
Legally Required Modulation Level

System Receiving 8500S's Digital Output Will Not Lock

You See A "Communications Board Error" Message

19 kHz Frequency Out-of-Tolerance

L–R (Stereo Difference Channel) Will Not Null With Monophonic Input

Audio Mute Occurs When Switching Between UL and Non-UL Presets

Talent Complains About Delay in Their Headphones

HD Output Sounds Too Bright

See System Will Not Pass Line-Up Tones at 100% Modulation (directly above) for an
explanation. These tones should be injected into the transmitter after the 8500S, or
the 8500S should be temporarily switched to
Be sure that the 8500S's output sample rate is set match the sample rate that the
driven system expects. Be sure that the 8500S's output FORMAT (AES3 or SPDIF) is set
to match the standard expected by the driven system.
This can be caused by applying an AES3, AES3id, AES11, or AES11id to the
10 MHz/wordclock input. Use one of the AES3 inputs for AES3 sync sources.
First, verify that a problem really exists by using a second frequency-measuring de-
vice and/or verifying the problem with a monitoring service. If the problem is real,
contact Orban Customer Service for a crystal replacement; there is no frequency trim
available.
This problem is often caused by relative phase shifts between the left and right
channels prior to the 8500S's input. This will cause innocuous linear crosstalk be-
tween the stereo main and subchannels. Such crosstalk does not cause subjective
quality problems unless it is very severe.
This is normal. It occurs because the DSP code must be reloaded.
Dedicate an output to low-delay Monitor mode and use this to drive headphones.
See Monitoring on Loudspeakers and Headphones on page 1-25, and step (B) on
page 2-30. Alternatively, use an Ultra-Low-Latency (UL) preset. See Ultra-Low-
Latency Five-Band on page 3-19.
Enable adjustment of the HD output's spectral balance by putting the on-air preset
into I mode. Do this by setting the FM HD C
NDEPENDENT
the HD L page of A
IMITING
control via two buttons on the button bar in 8500S PC Remote. See page 3-64.
In this mode, the HD processing channel's equalizer, five-band compressor, and
band-mix controls are independent of the corresponding controls in the FM channel
and can be adjusted separately. You can therefore fine-tune high frequencies by ad-
justing the equalizer, parameters in the band 4 and band 5 compressors, the band 4
and band 5 B M
AND IX
ways to tame harsh high frequencies dynamically is to activate the HD channel's
band 5 compressor. See HD Audio Controls on page 3-70.
C
DVANCED ONTROL
controls, and the HD D
to pass the tones.
BYPASS
C
ONTROL
to I . You can also toggle this
NDEPENDENT
- control. One of the most effective
E ESS
ORBAN MODEL
control in
OUPLING