Sherbourn Technologies LDS16-40 owner manual Input Selection Switches, Trigger Mode Switch

Fig. 1. Rear Panel of LDS1640 With Eight Zones

that this Test Sequence will be performed just once, immediately after the unit is first powered up.

If LDS LEDs are all Green (the test results are good)

If all the LDS LEDs are in green, bright or dim, it indicates all speakers connected to the amp are greater than 4 ohm, and no short-circuit exists in the speaker wiring. The amplifier is safe to drive the speakers.

The LDS LED of a zone will be in full brightness, if the trigger switch of that zone is set to ON, or to MUSIC if the amp is receiving a music signal, or to 12V if a 12Vdc trigger input is fed to the trigger input jack. Otherwise, it shall remain in low-level green.

For those zones with LDS LED in full brightness, their speakers are automatically connected (by internal relays); if an LDS LED is dim, the internal relay of that zone amp does not get connected to the speaker.

If any of the LDS LEDs are Red it is an indication that on the offending zone(s) either the load is too low or a short circuit exists.

Indicates the speaker connected to that zone amp either has a short-circuit connection or speaker impedance that is too low (less than 4 ohms

typically) for the amplifier. The amplifier repeats the LDS test on that zone, and the LDS LED keeps flashing red. The amplifier will not be connected to the speaker unless the fault condition is corrected. See the troubleshooting section on page 5 if you encountered this problem.

Input Selection Switches

The zone amplifiers of LDS16-40 are split into two groups, A and B, with zone 1 to 4 being the A group and 5 to 8 the B group. Except for zone 1, each zone contains an input selection switch allowing it to receive either a GLOBAL main signal or a LOCAL zone signal. The group A amplifiers can thus receive a Global-A signal (fed to the zone 1 RCA input) and the group-B amplifiers can receive either the same group-A signal by setting zone 5’s input selector to ZONE 1, or receive its own global- B signal (fed to the Zone 5 RCA input). With the input selection switch of a zone set to its own zone, the zone amplifiers receive the signal via the RCA jacks of that zone.

Trigger Mode Switch

On

Setting the trigger mode switch to the ON position allows the LDS16-40 to stay ON all the time. None of the amplifiers will enter the standby mode. The power to the amplifiers can only be turned off by turning off the front panel power switch or disconnecting the power cord.

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