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U707B
LM339
Notes
DISPLAY
Amplifierfront panel indication includes a total of 7 LED's. These include
Enable, ODER, SPI/IOC, and ILOAD/ILIMIT.
The Enable indicator is an amber light which indicates presence of the
low voltage supply. It is powered by the unregulated +24VDC supply.
It will be on any time the power switch is depressed (unless the low
voltage fuse blows).
ODER indicators provide an on-line indication of amplifier thermal
reserve. The LED's are amber (although they may have a reddish
appearance) and are normally on. They dim and/or extinguish in the
eventthattheamplifier'sthermal reserve ¡sexhausted. ODER indicators
will also extinguish whenever the main supply relays are open (such as
a protection action being activated, or during Soft-start time-out).
Green SPI/IOC LED's show signal presence (SPl) and any form of
distortion (IOC) They flash dimlywith the audioto show signal. Inthe
event of an IOC condition (output waveform differs from input by
>0.05%) the light will be on brightly. An occasional flash of !OC usually
indicates clipping. If the IOC light locks in it usually ¡ndicates a protective
action, including ODER limiting.
MA-5000VZ - 29
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