HP 8555A Service Manual

Installation
tion; air
is exhausted through the side panel per-
forations. When operating the instrument, choose a
location which provides
at least three inches of
clearance around the rear and both sides. Refer to
the Display Section manual for maintenance in-
structions for the cooling system.
2-19. Interconnections
2-20. The RF and IF Sections are normally
shipped separately, the plug-ins must be mechani-
cally fitted together, electrically connected, and
then inserted in the Display Section or mainframe.
To
make these connections, refer to Figure 2-1 and
proceed as follows:
a.
Set the IF Section on a level bench. Lo-
cate slot near right rear corner of RF Section; also,
locate metal tab on IF Section that engages with
this slot.
b. Grasp
the 8555A RF Section near middle
of chassis and raise until it is a few inches above
the IF Section.
c. Tilt
RF Section until front of assembly is
about 2 inches higher than the rear.
d. Engage assemblies in
such a way that
metal tab on the rear of the IF Section slips
through the slot on RF Section.
e. With the preceding mechanical interface
completed, gently lower RF Section until electrical
plug
and receptacle meet.
f. Position RF Section as required to mate
the plug and receptacle. When plug and receptacle
are
properly aligned, only a small downward pres-
sure is required to obtain a snug fit.
g. Position the latch on each side of the RF
Section to lock the RF and IF Sections together.
h. Remove
the 50-ohm lead assembly AT4
(shipped
taped to top of the RF Section) and in-
stall at the AUXILIARY "A" connector on the
rear panel of the Display Section. On Display Sec-
tions not equipped with an AUXILIARY "A" con-
nector, install 50-ohm load assembly AT4 at
AUXILIARY "A" connector on rear of RF Sec-
tion.
1. Pick up the RF /IF Sections and center in
opening
of Display Section. Push forward until
assembly fits snugly
into Display Section main-
frame.
j. Push in front latch to securely fasten
assembly in place.
2-2
Model8555A
2-21. To separate the RF /IF Sections from Dis-
play Section and to separate the RF Section from
the IF Section, proceed as follows:
a.
Push front panel latch in direction of
arrow until it releases.
b. Firmly grasp the middle of latch flange
and pull RF /IF Sections straight out.
c. Unlock the latch on each side of the RF
section and exert an upward pulling force on front
edge of RF Section.
d. When the two sections separate at the
front, raise RF Section two or three inches and
slide metal tab at rear of IF Section out of the slot
with which it is engaged.
2-22. Three HP 11593A 50-ohm Terminations are
supplied with each HP 8555A. They should be
connected to the unused EXT MIXER, FIRST LO
OUTPUT, and SECOND LO OUTPUT connectors
on the front panel.
2-23. STORAGE AND SHIPMENT
2-24. Original Packaging
2-25. The same containers and materials used in
factory packaging can be obtained through the
Hewlett-Packard Sales/Service offices listed at the
rear of this manual.
2-26. If the instrument is being returned to
Hewlett-Packard for servicing, attach a tag indi-
cating service required, return address, instrument
model number and full serial number. Mark the
container FRAGILE to assure careful handling.
2-27. In any correspondence refer to the instru-
ment by model number and full serial number.
2-28. Other Packaging Materials
2-29. The following general instructions should be
followed when repackaging with commercially
available materials:
a. Wrap
the instrument in heavy paper or plastic.
(If shipping to a Hewlett-Packard Service office or
center attach a tag indicating the type of service
required, return address, model number and full
serial
number.)
b. Use a strong shipping container. A
double-wall
carton made of 350 pound test
material is adequate.

HP 8555A Specifications

General

Brand	HP
Model	8555A
Category	Measuring Instruments
Language	English