Maintenance
1705A Spectrum Monitor 6-21
1. Remove the bezel.
WARNING.The crt may retain a dangerous charge. Groundthe conductor of the
anode to dischargethe crt. Do not allow the conductor to touch your body or
any circuitry.
2. Remove the anode connectorand discharge it to ground.
3. Disconnect J2 (tracerotation) on the Main board and push the connector
through the hole in the board.
4. The CRTcan now be pulled straight out (some pressure is needed). The CRT
shield, along with the rubbermanchet around its back, should come out with
the CRT.
1. If the CRT is to be replaced, remove the metal sh ield from the neck of the
old crt and placeit around the neck of the new CRT, with the WARNING
sticker towardsthe top ofthe instrument. Be prepared to align the notches in
the metal coverwith theplastic CRT holder.
2. Slip the CRTpart way back into position and feed the trace rotation wires
(and plug) backthrough the hole in the Main board.
CAUTION. Avoidb ending the crt base pins when pushing the crt int o the socket.
3. Slide the CRT into the instrument, guiding the rubber mancheton the end of
the shield into the rear CRTsupport.
4. Align the socket on theA10 C RTSocket board with the pins and key on the
CRT. Gently push the CRT and the socket board together until the CRTpins
are fullyseated in the socket.
5. Replace thetrace rotation connector (J2, Main board), and snap the anode
lead onto the anode connectoron the side of the C RT.
6. Wipe the faceplate of the CRT to remove fingerprints, t hen replace the bezel.
If the fit is too tight to allow the bezel to go into po sition, or if the CRThas a
loose fit after the bezel is completely tightened do wn, then the rear CRT
support must be repositioned.
Toreposition the rear CRT support, loosen the two nuts that hold the support
in place. With the CRTan d bezel in place, push the support towards the
front of theinstrument until it is snug against the rubber manchet on the rear
of the CRTshield. Tighten the two support nuts.
Removal of the CRTReplacing the CRT