![AT&T 4 ESS Manual Download Page 124](http://html1.mh-extra.com/html/atandt/4-ess/4-ess_manual_2994836124.webp)
manual update
required
oscillator
No
Yes
using open loop
AND
AND
[9] Disconnect oscillator manual
[13] Is
[14] Align
[8] Check 39B oscillator frequency
[7] Check full frequency range of
oscillator manual adjustment
[10] Stabilize 39B oscillator
[11] Calibrate scope
[12] Check 39B oscillator
CLEAR REPETITIVE 39B OSCILLATOR RANGE EXCEEDED MESSAGE, NCSU
CAUTIONS
(P13)
immediately
even if
oscillator is
not physically
removed
immediately
oscillator
being checked
must be
powered down
2. Remove RF
3. Clock chain of
OUTPUT cable
[6] See CAUTION 3. Connect
[5] Install oscillator
[4] See CAUTION 2. Remove
TAP
234-151-013
140
DEC 1995
Issue 8
PAGE 2 of 2