Manual

QHSO (Quartz High Stabilit y Oscillator) Chapter 6: S SI R eplacement Procedures
Procedure 6 -4 R eplacing the QHSO (Continued)
6
Grasp the left end (that is, thumbscrew end) of QHSO and pull it away from the S SI rear panel
until the 9–pin D -connector is fully disengaged.
7
Slide the QHSO until its mounting tab is disengaged from the retaining slot on the S SI rear
panel.
8
W ith the replacement QHSO properly positioned in front of the S SI rear panel, insert the
QHSO mounting tab under the retaining slot on the S SI rear panel.
9
Align the QHSO 9–pin D -connector with the HSO connector on the S SI rear panel. Firmly
push the QHSO against the S SI rear panel until the connectors are fully engaged.
A fter the replacement QHSO is re-connected, it is powered up.
10
Align the QHSO thumbscrew with the threaded hole. Using a T20 TORX bit and driver ,
tighten the thumbscrew to 2.3 N-m (20 in-lbs).
T o optimize the system at this time, refer to Optimization required following
this table.
11
Properly position the S SI so that the two hooks on the S SI bracket are engaged in the two
slots on the mounting shelf .
12
Engage the two captive thumbscrews, on the S SI bracket right angle flange, into the
mounting shelf .
13
Using a T25 TORX bit and torque driver , tighten the thumbscrews to 2.37 N-m (21 in-lb).
Optimization required
Refer to the 1X UBS Macro BTS Optimization/A TP manual for the following optimization/test
instructions:
• Timing Initialization/V erification
• BTS Device Database Audit
• BTS Device Database Update
6 -16 68P09283A64 -3
FOA SEP 2007