3-2

Diagnostics

Table 3-1LED diagnostic messages.

The ISP-100 was designed with built-in diagnostics that activate when power is applied to the unit. During the power-up cycle, the ISP-100 performs several self-checks. The ISP-100 also will report problems, as they happen, while the unit is running. The diagnostic messages are communicated through the front panel LEDs. Refer to Table 3-1 for a list of common LED conditions and corresponding diagnostic messages.

Factory Default Mode

A yellow host LED indicates factory default mode. This mode usually results from either an OS update or memory erasure. When in this mode a default QuickMAP and QuickSET are loaded that prevents the unit from passing damaging signals. The QuickMAP configures the ISP-100 as a straight through processor with high pass filters on the outputs. The corner frequencies of the high pass filters are set to

20 kHz.

To enter factory default mode, hold in the default switch (see Figure

2-1, item 6) while turning on the power. Continue to hold in the switch until the front panel LEDs turn red and begin to rotate.

Note that when the factory default QuickMAP is loaded one or more slot LEDs may blink yellow. This is normal operation and not an error.

10 July 1998

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Telex ISP-100 manual Diagnostics, Factory Default Mode