Maintenance
6-24 1705A Spectrum Monitor
FRONT
J1
Removet hese screws
tor emove A3 Main bd.
Removet hese screws
tor emove 70MHZ Turner.
Removethis nut
toremove L-Band Turner.
Figure6 -11:Screws holding the Main board (A3) and the Tuners (A5 and A6) in
place
4. Remove the six screws that hold the cover on the 70 MHz tuner. (The cover
serves asa hold down for the L--Band tuner.)
5. Slide the tuner backand upward until the L--BAND INPUT connectoris
clear of the rear panel.
1. Unsolder the threewires from the feed-through capacitors at the back of the
70 MHz tuner.
2. Unplug the coax connectorfrom the rear of the 70 MHz tuner.
3. Remove the 70 MHz tunercover. It is held on by six screws. S eeFig-
ure 6-11.
4. Turnthe 1705A on its left side (crt down) and remove the two screws that
securethe 70 MHztuner to the main chassis.
5. Slide the tuner backand upward to remove.
6. Reverse the procedureto re-install the tuner.
1. Remove both tuners.
Removing the 70 MHzTunerRemoval andReplacement of the MainBoard