6-16 Keysight N5224A/25A Service GuideReplaceable PartsReplaceable Parts Listings6-Top Assemblies and Cables, All OptionsTop Assemblies, All OptionsWhen replacing an old assembly, install an assembly with either the samepart number or the new part number.ReferenceDesignatorPart Number Qty DescriptionA4 N5240-60074Was N5242-601501 13.5 GHz (source 1) synthesizer boardA5 5087-7342 1 26.5 GHz source (1) boardA6 Not used.A7 5087-7349 1 Doubler assembly port 1A8 5087-7349 1 Doubler assembly port 2A9 Not used.A10 5087-7342 1 26.5 GHz source (2) boardA11 Not used.A12 5087-7349 1 Doubler assembly port 3A13 5087-7349 1 Doubler assembly port 4A14 N5240-60069 1 Frequency reference boardA15 N5240-60074Was N5242-601501 13.5 GHz (LO) synthesizer boardA16 N5240-60077Was N5240-600561 Signal Processing ADC Module (SPAM) boardA17 N5240-60074Was N5242-601501 13.5 GHz (source 2) synthesizer boardA18 N5247-60002 1 System motherboardA19 W1312-60095 1 Midplane boardA20 0950-4934 1 Power supplyA21 W1312-60196 1 CPU board assembly, Intel ® 2.0 GHz Core ® i7aA22 N5240-60059 1 GPIB boardA55b N5242-60088 1 Solid state drive assembly (SSDA) for Windows XP Operating System -to be used with the 2.0 GHz CPU board W1312-60196, System CPUversion 6cN8983A d Solid state drive assembly (SSDA) for Windows 7 Operating System -to be used with the 2.0 GHz CPU board W1312-60196, System CPUversion 6c➀ 1420-0356 1 Battery, lithium manganese dioxide, 3V, 0.22A-hr. e