HP 8662A Operating And Service Manual page 40

8662A Option H17
08662-92035
Page 5 of 15
WARNING
Reconfiguration of jumper wires as described below should be
performed only by service trained personnel who are aware of the
possible hazards involved (for example; fire and electrical shock).
Remove the power cord before removing the instrument covers.
Also, both the personnel doing this reconfiguration and the work
area being used must be static safeguarded to protect sensitive
components from electrostatic discharge.
To enable the rear panel AUX FM INPUT, the jumper wire on the A4A9 Modulation Drive
Assembly must be connected from pin 21 of the board's edge connector to pin 14 of
A4A9U6A. See part of Figure 8-539 on page 15 of this Insert.
To disable the rear panel AUX FM INPUT, the jumper wire must be connected from pin 21
of the board's edge connector to pin 11 of A4A9U7A. See Figure 8-537A on page 8-522.
(The instrument is factory-wired with AUX FM disabled).
On page 3-69, in Comments (Cont'd), under Greater Stability, replace the NOTE with the
following:
NOTE
AM and FM is possible, with reduced stability, by using a second
external source for FM and the rear panel AUX FM INPUT (enabled
with a jumper on the A4A9 board).
On page 3-70, in Comments (Cont'd), replace the paragraph starting with "DC Coupling with
Phase Lock" and the next paragraph with the following:
DC Coupling With Phase Lock. For external control of FM peak deviation (for signals
entering the rear panel AUX FM INPUT):
* Enable the AUX FM INPUT by performing the changes described in the
preceding section titled Procedure on page 3-68.
Copyright 1983 - HEWLETT-PACKARD COMPANY ~ Spokane Division
24001 E. Mission Ave, Liberty Lake, WA 99019-9599 U.S.A.