Click here to make tpub.com your Home Page

Page Title: Section X. MAINTENANCE OF TTY LOOP MONITOR ASSEMBLY SM-D-936640
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
   
   

 

TM 11-5895-1123-34
Section X. MAINTENANCE OF TTY LOOP MONITOR
ASSEMBLY SM-D-936640
3-31. Removal  of  TTY  Loop  Monitor  Assembly
the meter to the monitor assembly front panel. Remove
SMD936640 a. Loosen the four captive screws
the meter.
on the front of the TTY loop monitor assembly.
(4) Install the new meter; secure it to the monitor
b. Pull the TTY loop monitor assembly forward, and
assembly front panel using the hardware of b(3) above.
remove the three cables from the three rear panel
(5) Connect  the  capacitor  across  the  meter
connectors, J1 through J3.
terminals.
e. Disconnect the grounding cable from E 1 on the
(6) Connect the wires removed in b(l) above to the
rear panel of the loop monitor assembly.
meter terminals and solder.
3-32. Maintenance of TTY Loop Monitor Assembly
c. Replacement of Rear Panel Connectors J1, J2,
SMD936640 a. Replacement of Rotary Switches
and J3.
SI and S2.
(1) Remove the hexjam nut securing the connector
(1) On the defective switch, tag and unsolder the
to the monitor assembly rear panel.  Remove the
wires or clip off the wires. If the wires are clipped off,
connector.
leave a piece of wire long enough so that the color code
(2) Transfer the wires, one at a time, from the
is readable.
defective connector to the replacement connector.
(2) Loosen the screw holding the knob and then
(3) Mount the connector on the rear panel and
remove the knob.
secure it to the panel using the hex-jam nut removed in
(3) Remove the hexnut securing the switch shaft to
c(1) above.
the rear of the monitor assembly front panel.
d. Replacement of Terminal Boards A1and A2.
(4) Install the replacement switch on the monitor
(1) Remove the screws, nuts, and spacers from the
assembly and secure it to the front panel.
defective terminal board. Remove the terminal board.
(5) Prepare the wires for soldering. Solder the wires
(2) Install the replacement terminal board using the
to the rotary switch terminals.
screws, nuts, and spacers removed in (1) above.
(6) Replace and secure the knob.
(3) Transfer the wires, one at a time, to the
b. Replacement of the LOOP CURRENT Meter
replacement terminal board.
(M2)and the LOW LEVEL TTY VOLTAGE Meter (M1).
3-33. Replacement of TTY Loop Monitor Assembly
(1) Tag and remove the wires connected to the rear
SMD936640.
of the meter.
(1) Connect the external cables to the rear panel
(2) Unsolder and remove the capacitor terminals
connectors J1, J2, and J3. Also connect the ground lead
(C1 or C2) connected across the meter.  Check the
to E 1.
capacitor; if good, save.  If the capacitor is defective,
(2) Insert the TTY Loop Monitor Assembly into the
replace it.
rack and tighten the four captive screws securing the
(3) Remove the four screws and nuts securing
panel to the rack.
Section XI. MAINTENANCE OF CONTROL MONITOR
-48V/20Hz ASSEMBLY
3-34. Removal of Control Monitor -48V/20 Hz
pull the assembly forward. When the assembly is clear
Assembly
of the rack, reach in and disconnect the two cable
The control monitor assembly is not secured to
the
connectors.
equipment rack using hardware. It is a force fit.
To
3-35. Maintenance of Control Monitor 48V/20 Hz
remove the control monitor assembly, grasp two of
the
Assembly ac Replacement of Circuit Breakers
front panel toggle switches and pull forward.  If
the
CB1 and CB2.
control monitor assembly will not come out, remove
the
(1) Remove the cover over the defective circuit
1600 Hz ringing supply next to it and then
3-53

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

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