HP 8663A CI-IANGES, On the A7A3 schematic:, On the A7Al schematic:, On the schematic:, revSOJUN89, Model 8663A, If replacingtheoLd, in an okkr instrument

	Y
Model 8663A	Service

		CI-IANGES
Z342A lo 2846A	On the A7A3 schematic:
l	A7A3	- Modify the schematicee&wn in the partial echmnaticUP/OFigu~
	m,	A7A.3PowerSupply Inverter, Motherboard & Liie Filter Schematic
	(2342Ato 2846AY on pa@ @-908.5

25lOA to 2846A On the A7A3 schematic:

lA7A3 ~Modify the schematices shownin the partial schmnatic“P/O Figul B-908,A7A3 PowerSupply Inverter, Motherboard& Line Filter Schematic (25lOA to 2646A)”on page6-906.6

Z545A and daave On the A7A4 %chematic:

l08662-60376- Chmge the part mmber of the A7A4 Assemblyto

08662-60376.

NOTE

If replacingtheoLdA7A4 powere&y motherboardwith the new board(08662-60X%),extremecareehou,Wbeezmcised aa the connection we armngedin o diferent o&r on the 08662-60376 board.For information regardinginstolling o newA7A4 Assembly

~08662-60376) in an okkr instrument, refer w Inatdation htructinm

on page8408.1 - HP Part number08662-90069The. wiring codesand

boardlabelsshownon the eckmntic arecm&.

:265lA and above

2846A and below

On the A7Al schematic:

l08662-60347- Changethe part number of the A7Al Assemblyto

08662~60347.

lQ4, Q6, Q8 - Changethe part numberof Q4,Q6, and Q8 to 18E4-0330in tl “Table of Tramistor and IntegratedCircuit Pact Numbers.”

On the schematic:

lfl- This aeeemblyis not individually backwardacompatibleexceptaea

total kit - the Fan ReplacementKit in availableeaHP part number

08662-60363.

If your rear panel frame ie damagedandyour fan needeto be replaced,ordl the F&ar Panel Kit, HP part number06662-60364See.section7 for furtbez information,

revSOJUN89 a-908.3