SERVICE
83522A-07
NOTE
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
Pa
HEWLETT
PACKARD
1
of
2
AUTHOR: ENTIN:
JG
4500
ADDITIONAL INFORMATION:
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