Troubleshooting

On-board Diagnostics

Pressing and holding the Hybrid OFF button (the bottom button on the front panel) for 3 seconds puts the unit into self-diagnostic mode. The Line Status display shows the current diagnostic state. This mode is only intended to provide status information and to confirm the hybrid unit is operational.

Note - The left hybrid front panel buttons control diagnostics of both hybrids on an Hx2 unit.

Software Version

Upon entering the diagnostic mode of operation, the Line Status display should indicate "V."  

The major revision number is displayed on the SND LED bar graph, while the minor revision number is displayed on the RCV LED bar graph. Simply count the number of illuminated LEDs in each bar graph for the respective numbers. In Figure 1 below, one segment is lit on the SND meter, and two segments are lit on the RCV meter, so the software revision number shown in this figure is Version 1.2.

DIP Switch Status

Press the Caller ON- HOLD button (the middle button on the front panel) to advance to the next diagnostic test. The Line Status display should indicate "S."

The SETTINGS bank of DIP switches is displayed on the SND meter bar graph, the OPTIONS bank of DIP switches is displayed on the RCV meter bar graph, and the internal bank of DIP switches is displayed on the EQ LO meter bar graph as shown in Figure 2 below.

For each bank of DIP switches, the status of Bit 1 is shown on the bottom LED segment of the bar graph, while the status of Bit 8 is shown on the top LED segment of the bar graph. If the switch is set to the ON position, the corresponding LED segment will light up. The figure below shows the Factory Default DIP switch settings. Note that for the default settings, all of the Bits of the internal DIP switch bank are set to the OFF position, and so no LEDs are lit on the EQ LO meter.

T1 Test - 400 Hz Tone Generation

Press the Caller ON-HOLD button (the middle button on the front panel) to advance to the next diagnostic test. The Line Status display should indicate "T1."

The DSP chip on the motherboard generates a 400 Hz sine wave that is sent to the RCV OUT XLR connector for each hybrid. The output level of the sine wave at the XLR is +20 dBu, and the output level should be displayed on the RCV meter bar graph as shown in Figure 3 below.

This diagnostic test also takes the telephone line off-hook and outputs a –7 dBm, 400 Hz sine wave. A telephone line or line simulator must be plugged into the LINE RJ11 jack to activate the telephone interface circuitry on the hybrid motherboard. The 400 Hz tone will also be audible on the PHONE RJ11 jack, but it will be heard mixed in with the telco’s dial tone or re-order tone.

T2 Test - Studio Loopback

Press the Caller ON-HOLD button (the middle button on the front panel) to advance to the next diagnostic test. The Line Status display should indicate "T2."

This test simply takes audio present on the SEND IN XLR connector and loops it back to the RCV OUT XLR connector without any processing. The loopback test works with either analog or AES inputs. This test can be used to adjust the INPUT LEVEL pot located in the back of the hybrid chassis by connecting a +4 dBu signal and adjusting the INPUT LEVEL pot until the yellow LED segment illuminates as show in Figure 4 below.

T3 Test - Feed Through

Press the Caller ON-HOLD button (the middle button on the front panel) to advance to the next diagnostic test. The Line Status display should indicate "T3."

This test takes audio present at the SEND IN XLR connector and feeds it to the LINE RJ11 connector without any processing. Likewise, whatever signal is being fed into the LINE RJ11 connector will be routed to the RCV OUT XLR connector.

Pressing the Caller ON-HOLD button once more will end the testing sequence and return the unit to normal operation.