Click here to make tpub.com your Home Page

Page Title: Diagnostic Circuits
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home


   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 

T.O. 31W2-2GSC24-2
TM 11-5805-688-14-1
NAVELEX 0967-LP-545-3010
The high error output enables AND gate U23-8, causing
The minor frame counts from both minor frame
link error rate signal LLER to be generated and light the
generation circuits are identical when the equipment is in
LINK ERROR RATE indicator on the front panel. At the
a no-error condition. Therefore, diagnostic comparator
same time, remote alarm relay K3 energizes and initiates
U22 produces an A=B output that holds flip-flop Ull-6
remote link error rate signals LERRC1 and LERRC2.
output high. When an error condition exists, the minor
The output from AND gate U24-10 applied to AND gate
frame counts applied to U22 do not compare and the
U23-3 is inhibited by the low-level ST1-signal applied to
A=B output is low. As a result, the output of Ull-6 goes
the second input to AND gate U23-3. AND gate U23-3 is
low and generates loss-of- frame error signal LOMFC-
used only in the diagnostic self-test function to test the
the next time signal DEOS2B- occurs. In the self-test
ERD logic.  When the count from U25'reaches zero,
mode, flip-flop Ull-6 is held in the clear condition to
AND gates U24-10, U24-13, and U23-11 combine to
generate signal LOMFC-.
produce an inhibit signal to AND gate U17-6. With AND
gate U17-6 inhibited, no further count down occurs in
U25.
5-559. When the SELF TEST switch on the front panel
is set to the on(up) position, self-test signal ST1- goes
5-557. Remote Alarm Circuits. The diagnostic circuits
low and sets latch U18-11, U18-3. The high signal from
in the power supply generate power supply fail signals
U18-11 enables one input of AND gate U23-3. At the
PSFR and -12 PSFR to energize remote alarm relay K6
same time, the low output from U18-3 clears U33,
when a power supply failure occurs. Energizing relay K6
forcing error up/down counter U25 to count down and
generates a closed-loop condition through remote power
generate an error signal from AND gate U24-10 to AND
supply fail signals PSFC1 and PSFC2. that are routed to
gate U23-3.  When AND gate U23-3 is enabled, rate
the REMOTE ALARMS connector on the rear panel.
detector diagnostic error signal DERD- is generated. At
The functional operation of each of the remote alarm
the same time, signals ST1- and ST2- are applied to all
relays K1 through K6 is basically the same.  A card
the cards in the multiplexer set to set all diagnostic
failure in the multiplexer set is applied as signal FAIL to
circuits in the self-test mode.  In the self-test mode
relay K1. An out-of-tolerance condition in the multiplexer
remote alarm relays K1 through K6 are energized to
function is applied as out-of-tolerance signal LMOOT to
produce error indications. When the SELF TEST switch
relay K2. Relay K3 is energized when the count in the
is set to the off (down) position, signal STS is applied to
output of error up/down counter U25 decreases to a
reset latch U18-11, U18-3. The output from U18-3 goes
count of three.  Relay K4 is energized by multiplexer
high and enables AND gate U26-3 in the reset circuits.
loss-of-timing signal LOTRA- or by demultiplexer loss-of-
The low output from U26-3 causes error reset signals
timing signal DLOF. Relay K5 is energized by a loss of
ERST-, ERST, DERRS, DERRS- and reset temperature
frame sync signal DFS.
alarm signal RTA to be generated and reset all the
diagnostic circuits in the multiplexer set to their off state,
5-558. Diagnostic  Circuits.
Shift  register  U13,
assuming that the multiplexer set is in a no-error
counters U14 and U6, and comparator U15 form the
condition.
diagnostic minor frame generation circuits that are
identical to the functional minor frame generation circuits.
5-151

Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business