TWR Lighting E-1DBSL Manual page 20

DUAL MEDIUM INTENSITY LED/STROBE
3.8.6 Timing Signal Verify (PCB #1, LED9)
3.8.7 Flash Verified (PCB #1, LED5)
3.8.8 Strobe Fail Test (PBC #1, LED2)
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
MODEL E-1DBSL
Timing pulses (either primary or secondary) are received at LED9 (D28).
The LED will flash according to the pulses received from the timing circuit,
but should be 40 +/-2 FPM. In the unlikely event that this LED is out, then
total timing failure has occurred.
Current from the Cathode side of the flashtube (FTC) is sent through the
current sensing transformer T4 on PCB #1. T4 will send a pulse to the gate
of the SCR's Q13, and turn it on. Capacitor C15, which is fully charged via
Q13, will send voltage to LED5. After each confirmed flash, LED5 will
blink. Absence of a blinking LED signifies that the strobe beacon has ceased
to flash.
Switch S1, when turned downward, cuts off the timing signal to the trigger
circuit and extinguishes LED9 (D28). Then LED2 (D25) flashes to confirm
the trigger circuit is disabled. At this time, a strobe alarm should be received
at P12. The normal position of switch S1 is on (switch upward).
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