Keysight N5224B/25B Service Guide 7-43
Repair and Replacement Procedures
Removing and Replacing the A27 and A28 Mixer Bricks
Removing and Replacing the A27 and A28 Mixer Bricks
1
Tools Required
— T-8 TORX driver (torque to 6 in-lb)
— T-10 TORX driver (torque to 9 in-lb)
— T-20 TORX driver (torque to 21 in-lb)
— 5/16 inch open-end torque wrench (torque to 10 in-lb)
— ESD grounding wrist strap
Removal Procedure
Refer to
for this procedure.
1.
Disconnect the power cord.
2.
Remove the outer cover. Refer to
“Removing the Covers” on page 7-7
3.
Position the analyzer bottom side up.
4.
Disconnect all semirigid cables (item
) from each of the mixer bricks and
the A26 splitter.
2
2-port models have only one mixer brick, A27, and no
A26 splitter; 4-port models have two mixer bricks, A27 and A28, and the
A26 splitter.
5.
Disconnect the ribbon cables (item
) from each of the mixer bricks.
6.
Remove two screws (item
) from each end of the mixer brick bracket.
7.
Move the disconnected semirigid cables out of the way and lift the mixer
brick mounting block out of the analyzer just enough to allow the gray
flexible RF cables (item
) to be disconnected. It may be necessary to
loosen the connector at the other end of some of the semirigid cables to
allow them to be moved enough.
1. Some PNA models have newer model A27/A28 mixer blocks installed. A68/A69 3 dB attenuators are only
applicable to instruments with legacy 5087-7323/5087-6323 mixer bricks. The new 5087-7417 mixer brick
have the 3 dB pads integrated into the mixer brick assembly. Legacy A27/A28 mixer bricks use the
5245-20021 semi-rigid cable. New mixer bricks use the N5245-20191 semi-rigid cable. Refer to your
option-model in Chapter 6
“Bottom Assemblies and Cables by Option Set:” on page 10
.
Be careful not to damage the center pins of the semirigid cables. Some
flexing of the cables is necessary to remove assemblies but do not
over-bend them.
2. The A26 splitter (5067-4086) and N5245-20013, N5245-20022, N5245-20023,
N5245-20101, and N5245-20150 cables are only used with a legacy HMA26.5 p/n:
5087-7765. If you are unclear which HMA26.5 assembly your PNA has installed,
refer to Chapter 7 and
and for details on A26 splitter and
cabling, refer to your option-model in Chapter 6
“2-Port Configurations, Serial
Number Prefix <6021” on page 31
and
“4-Port Configuration, Serial Number Prefix
.
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Страница 608: ...8 102 Keysight N5224B 25B Service Guide General Purpose Maintenance Procedures Correction Constants 8...
Страница 612: ...Appendix 4 Service Guide EEPROM Address Assignments and Location N5224 5A B PNA and N5244 5A B PNA X Instruments...
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