HP 8753E - Page 405

Node 18
IF Det 2N (IF on All phase lock after 3 MHz filter)
Perform step A11 and then press B ~~~~~:~~~ L18) (xl) m L20) m
(j-Ref_J ~~~~~~~
.._................... i < ::.
This node detects the IF within the low pass IIIter/iimiter. The IiIter is used
during the track and sweep sequences but never in band l(3.3 to 16 MHz). The
low level (about -1.7 V) means IF is in the passband of the 6Iter. This node can
be used with the FRAC N TUNE and SRC TUNE service modes.
sg6272d
Figure 19-14. Analog Bus Node 18
Node 19
IF Det 2W (IF after 16 MHz IUter)
This node detects IF after the 16 MHz fiIter/iimiter. The 6Iter is used during
pretune and acquire, but not in band 1. Normal state is a flat Iine at about
-1.7 v.
Service Key Menus and Error Messages
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