3-28 | Model 933 UV Analyzer
d. The green status LED (LED100) on the Host Controller board
(Figure 3-5) will stay ON steady for a few seconds before pulsing
at a rate of once per second. Verify this operation. The pulsing
indicates that communication has been established between the
Microcontroller and Host Controller boards.
You can also verify communication between the Host Control-
ler and Microcontroller boards by viewing LEDs D201 and D200
on the Microcontroller board (Figure 3-11). Both LEDs should be
pulsing in unison once per second.
e. Check the UV lamps to ensure they are firing (flashing).
Figure 3-11.
Microcontroller board
(P/N 100-1781).
LED D201
LED D200
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