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Configuration & Controls
Sonifex HY-03 User Handbook
7
HY-03 Internal Controls & Adjustments
If you need to get inside the unit to make configuration adjustments, simply remove the 4 screws in the corners of the
rear panel. The rear panel and main PCB will slide backwards out of the metal chassis.
When re-inserting the main PCB, ensure that the PCB edges are in the runners inside the chassis and also that the front
panel LED and divert button are in the correct place in the front panel.
Warning :
The power must be switched off at the supply or the power lead must be disconnected before attempting to
open the unit. Removal of the cover can expose dangerous voltages.
Warning :
The telephone line plug should be disconnected from the telecommunications network exchange line before
removing the cover.
Figure 2-4 : HY-03 Preset Controls and Alignments
Setting the Number of Rings for The Ringing Detector
To alter the number of rings that occur before the ringing detector auto answers the call, use a jeweller’s screwdriver to
adjust RV8. The equipment is factory set for 3 rings, but this can be adjusted between 1 and 6 rings.
Note : The number of rings above are for UK ring tones and may vary for non-UK telephone exchanges.
Switching the Noise Gate On/Off
An output noise gate operates when the telephone signal is below the noise gate threshold control. This noise gate reduces
the output gain by 34dB under no signal conditions eliminating the affects of telephone line cross talk. The noise gate can
be switched off if you don’t wish to use it by adding JP1 on the main circuit board.
JP1 ON – Noise Gate Off
JP1 OFF – Noise Gate On
Mic Gain
Limit Level
Noise Gate
Disable
Res Auto
Disable
Line
Reverse
K-Break
Cap Auto
Disable
Noise Gate
Threshold
Optional
HY-03DTD
Board
On units serial number
HY000323 upwards
Plug-in
Header
Mounting screw
on a pillar
Output
Level
Sample
Threshold
Rings
Res Set
Cap Set
RV4
RV7
RV2
JP1
JP4
JP5
JP1
JP16
JP2 JP3
RV6
RV5
RV8
RV3
RV1