TB 9-6625-2309-24
NOTE
Multimeter negative lead may be connected to shield of TP1
(fig. 17) on A/D 1A2A8.
e. Record multimeter indication (multimeter indication should be near -2.00 V dc).
f. Move multimeter positive lead to ICU5, pin 24 (fig. 17).
g. Multimeter will indicate positive within 0.05 V dc of recorded value in e above; if
not, adjust R6 (fig. 17) R).
h. Repeat technique of d through g above for a multimeter indication within 0.05 V dc.
i. Connect multimeter negative lead to ICU6, pin 12 and positive lead to ICU5, pin 23
(fig. 17). Multimeter will indicate between +9 and +11 mV dc; if not, adjust R1 (fig. 17) (R).
Perform (1) through (7) below:
j.
(1) Set ON-OFF switch to OFF.
(2) Disconnect multimeter leads.
(3) Install electrical shunt across JP2 (fig. 17).
NOTE
Electrical shunt is currently on one of two pins on JP2 (fig. 17).
(4) Remove A/D SHORTING PLUG (LPTF-1047) from J1 (fig. 17).
NOTE
Tie down strap on TI inside chassis wall may need to be cut to
allow more coax movement (observe caution).
(5) Install coax connector on J1 (A/D 1A2A8) (fig. 17) circuit board (observe caution).
(6) Remove existing optical module from TI.
(7) Install LPTF-1056 (TS-4320) MODULE SIMULATOR in TI optical module
compartment (fig. 15).
NOTE
Ensure module switch positions on module simulator board are
set to any one of the three optical modules.
k. Set ON-OFF switch to ON.
NOTE
Allow 15 minutes for TI to warm-up before making voltage
measurements.
l. Connect multimeter negative lead to ICU6, pin 12 and positive lead to TP2 center
post on A/D 1A2A8 circuit board (suggest making connections on solder side of A/D 1A2A8
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