Manual

1X UBS Macro B T S FRU QHSO (Quartz High Stabilit y Oscillator)
QHSO replacement procedure
• This procedure requires working on or around circuitry extremely sensitiv e
to ESD . W ear a conductiv e, high impedance wrist str ap while performing this
procedure.
• F ollow appropriate safet y measures.
P erform the steps described in Procedure 6 -4 to replace the QHSO .
Procedure 6 -4 R eplacing the QHSO
A T THE BTS SITE
1
W ear a conductive, high impedance wrist strap while performing the following procedure.
DO NOT power down the S SI!
DO NOT disconnect any cables from connectors on the S SI!
2
Use a T25 TORX bit/driver to completely loosen the two captive thumbscrews on the S SI
bracket right angle flange. Disengage the thumbscrews from the mounting shelf .
3
Grasp the S SI bracket right angle flange. Slide the S SI toward the middle of the mounting
shelf until the S SI bracket hooks are disengaged from the two slots on the mounting shelf .
Pull the S SI out of the mounting shelf .
4
Be careful not to accidentally disconnect an y S SI cables while manipulating the S SI.
Set the S SI on its bracket right angle flange so that the S SI rear panel/QHSO is accessible.
5
Using a T20 TORX bit and driver , loosen the thumbscrew on the QHSO . Using your thumb
and finger , completely loosen the captive thumbscrew .
Continued
68P09283A64 -3 6 -15
FOA SEP 2007