Keysight Technologies N5244/5B Service Manual page 560

Repair and Replacement Procedures
Removing and Replacing the A4–A17 Boards (For analyzers with serial numbers
prefixed MY/SG/US5150 and below)
Removing and Replacing the A4–A17 Boards
(For analyzers with serial numbers prefixed MY/SG/US5150 and
below)
The following may apply to your B model PNA: In February 2012, the
N5244A and N5245A analyzers underwent significant hardware changes.
These changes included a redesigned Signal Processing ADC Module
(SPAM) board, 13.5 GHz (source 1, source 2, and LO) synthesizer board,
inner cover (retaining shield), left side inner bracket, right side inner
bracket, chassis base, and test set deck. It is very important that this
redesigned hardware be used only with analyzer serial numbers prefixed
MY/SG/US5201 and above. If you have an analyzer whose serial number is
prefixed MY/SG/US5150 and below, you must use the previous version of
hardware rather than the redesigned hardware - refer to
and Cables, All Options, Serial Number Prefixes <6021" on page
Be very careful to use the appropriate hardware in your analyzer. Using the
wrong hardware can ruin analyzer components, resulting in additional
customer costs.
If you have a PNA-X with a serial number prefix <6021 and have not had a 2S7 or
4S7 version 7 synthesizer assembly upgrade, then you have A4, A10, A11, and A13
boards.
If you have a PNA with a serial number prefix ≥6021 or have had a 2S7 or 4S7
version 7 synthesizer assembly upgrade, then you have an A11 direct digital
synthesizer (DDS) instead of the A4, A10, A11, and A13 boards.
See also,
<6021" on page 6-19
Number Prefixes ≥6021" on page 6-27
Tools Required
— T-10 TORX driver (set to 9 in-lb)
— T-20 TORX driver (set to 21 in-lb)
— 5/16 inch open-end torque wrench (set to 10 in-lb)
— 9 mm socket or open-end wrench (set to 21 in-lb)
— ESD grounding wrist strap
Removal Procedure
Refer to
Assemblies, All Options, S/N Prefixes
Any cables that are removed should be labeled for reinstallation later.
1. Disconnect the power cord.
7-20
"Top Assemblies and Cables, All Options, Serial Number Prefixes
"Top Assemblies and Cables, All Options, Serial
and
Figure 7-10 for this procedure. And, refer to
"Top Assemblies
.
Figure 6-6, "Top
<6021".
Keysight N5244B/45B Service Guide
6-19.