10-34 Chapter 10
Service Key Menus and Error Messages
Service Key Menus
Node 18 IF Det 2N (IF on A11 phase lock after 3 MHz filter)
Perform step A11 and then press
.
This node detects the IF within the low pass filter/limiter. The filter is used during the
track and sweep sequences but never in band 1 (3.3 to 16 MHz). The low level (about
−1.7 V) means IF is in the passband of the filter. This node can be used with the FRAC N
TUNE and SRC TUNE service modes.
Figure 10-13 Analog Bus Node 18
Node 19 IF Det 2W (IF after 16 MHz filter)
Perform step A11 and then press
.
This node detects IF after the 16 MHz filter/limiter. The filter is used during pretune and
acquire, but not in band 1. Normal state is a flat line at about −1.7 V.
18 x1 Stop 20 M/µ
Scale Ref
19 x1 Stop 20 x1
Scale Ref 0.2 x1
−1.2 x1
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