Tektronix 1705A User Manual
Page 146
Maintenance
1705A Spectrum Monitor
6- 21
1.
Remove the bezel.
WARNING. The crt may retain a dangerous charge. Ground the conductor of the
anode to discharge the crt. Do not allow the conductor to touch your body or
any circuitry.
2.
Remove the anode connector and discharge it to ground.
3.
Disconnect J2 (trace rotation) on the Main board and push the connector
through the hole in the board.
4.
The CRT can now be pulled straight out (some pressure is needed). The CRT
shield, along with the rubber manchet around its back, should come out with
the CRT.
1.
If the CRT is to be replaced, remove the metal shield from the neck of the
old crt and place it around the neck of the new CRT, with the WARNING
sticker towards the top of the instrument. Be prepared to align the notches in
the metal cover with the plastic CRT holder.
2.
Slip the CRT part way back into position and feed the trace rotation wires
(and plug) back through the hole in the Main board.
CAUTION. Avoid bending the crt base pins when pushing the crt into the socket.
3.
Slide the CRT into the instrument, guiding the rubber manchet on the end of
the shield into the rear CRT support.
4.
Align the socket on the A10 CRT Socket board with the pins and key on the
CRT. Gently push the CRT and the socket board together until the CRT pins
are fully seated in the socket.
5.
Replace the trace rotation connector (J2, Main board), and snap the anode
lead onto the anode connector on the side of the CRT.
6.
Wipe the faceplate of the CRT to remove fingerprints, then replace the bezel.
If the fit is too tight to allow the bezel to go into position, or if the CRT has a
loose fit after the bezel is completely tightened down, then the rear CRT
support must be repositioned.
To reposition the rear CRT support, loosen the two nuts that hold the support
in place. With the CRT and bezel in place, push the support towards the
front of the instrument until it is snug against the rubber manchet on the rear
of the CRT shield. Tighten the two support nuts.
Removal of the CRT
Replacing the CRT