HP 83522A Service Notes page 2

S E R V I C E
83522A-07
N O T E
SUPERSEDES None
83522A
RF
Plug-in
Serial Numbers:
0000AOOOOO/2528~
HP 83522A Marker Assembly Retrofits
Duplicate Semce Note:
83525A-07
Situation:
HP 83522A RF Plug-ins with serial prefixes listed above may experience problems when
replacing the marker assembly if a compatible motherboard and ALC assembly are not
currently installed.
Solution/Action:
Marker assemblies with HP P/N 8352560092 have new logic circuitry which will allow
a new signal 'SQ MOD 2 ' to be fed to the ALC assembly 'SQ MOD Delay Circuit' to
reduce Band 0 overshoot. However, this capability is only available if the new marker
assembly is used with a revised motherboard and new ALC assembly.
If a new marker assembly is installed in a unit with the incorrect motherboard and ALC
assembly, the -40V supply will be pulled down and the unit will not function properly.
Continued
DATE 15 May 1990
ADMINISTRATIVE INFORMATION
O 1990 HEWLETT-PACKARD COMPANY
PRINTED IN U.S.A.
SERVICE NOTE CLASSIFICATION:
INFORMATION ONLY
P a
HEWLETT
PACKARD
1 of 2
AUTHOR: ENTIN:
JG 4500
ADDITIONAL INFORMATION: