Panasonic GPH5D User Manual
Page 36
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the result is compared to a reference voltage. The reference voltage is provided
by a zener diode. If the output of the comparator goes high, Q6741 turns on
effectively grounding the SOS line. The SC board uses a similar circuit to monitor
the +17V line.
The SS and SC boards contain an LED indicator to alert the technician when a
problem exists. The LED should be lit during normal operation, a dark LED
indicates that a problem exists on that board.
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