Keysight N5241A/42A/49A Service Guide 6-201Replaceable PartsReplaceable Parts Listings4-Port Configuration, Options 400/419/423/H85Bottom Assemblies, 4-Port, Options 400/419/423/H85In June 2013, the N5241A/AS and N5242A/AS analyzers underwentsignificant hardware changes. Some components that have 2.4 mmconnectors (bias tees, couplers, and some semi-rigid cables) werereplaced with components that have 3.5 mm connectors. If your analyzer’sserial number prefix is MY/SG/US5321 and above, your hardware has 3.5mm connectors. If your analyzer’s serial number prefix is MY/SG/US5310and below, your analyzer was originally shipped with 2.4 mm connectors.Bias tees and couplers with 2.4 mm connectors are no longer available.Replacements have 3.5 mm connectors, so you must also replace old 2.4mm connecting cables with new 3.5 mm cables. This may also require thereplacement of other 2.4 mm assemblies that are interconnected. Refer tothe tables in this section of the manual to learn which 2.4 mm assembliesand cables must be replaced.Be very careful to use the appropriate hardware in your analyzer. Using thewrong hardware can ruin analyzer components, resulting in additionalcustomer costs.ReferenceDesignator Part Numbera Qty DescriptionA19 N5240-60163Was N5245-60003or N5240-600431 Test set motherboardA20 N5240-60062 bWas N5240-600451 IF multiplexer boardA21 5087-7765Was 5087-77111 LO Multiplier/amplifier 26.5 (HMA26.5)A22 5087-71395087-61391 SplitterA23A245087-7829Was 5087-7766, or5087-7722, or5087-73082 Mixer brickA25A26A27A285087-7757Was 5087-73154 Test port 1 bridgeTest port 3 bridgeTest port 4 bridgeTest port 2 bridgeA29A30A31A32critical footnote5087-7813 cWas 5087-77104 Test port 1 couplerTest port 3 couplerTest port 4 couplerTest port 2 coupler
