E8257D/67D, E8663D PSG Signal Generators Service Guide 301Assembly ReplacementA19 Power SupplyA19 Power SupplyTools Required— T–10 driver— needle–nose pliersRemoval ProcedureRefer to Figure 3-25 for this procedure.1. Disconnect the power cord.2. Remove the covers from the signal generator. Refer to “Outer InstrumentCover” on page 258 and “Inner Instrument Cover” on page 260.3. Position the signal generator with the A31 Motherboard facing you.4. Disconnect the W20 ribbon cable from the A20 SMI.5. Using the T–10 driver, remove the two screws (1) that secure the A19Power Supply to the struts located on the bottom.6. Using the T–10 driver, remove the three additional screws (2) that areattached to the bottom frame.7. Using the needle–nose pliers, disconnect A22W1 from the power supply.8. Using the T–10 driver, remove the screw securing the A22W2 to the A19Power Supply.9. Position the signal generator with the A31 Motherboard flat on the worksurface and the rear panel facing you.10.Disconnect the following ribbon cables:— W64 from A14J13 (E8267D only)— W90 from A14J21 (E8267D only)— W66 from A18P2 (E8267D only)— W18 from A18J111.Using the T–10 driver, remove the two screws (3) that secure the A19Power Supply to the struts located on the top and an additional screw (4)located on the top frame.12.Move W20 to the side and remove the A19 Power Supply from the signalgenerator’s chassis.13.Remove the screw that attaches the A34 Internal Hard Drive to the A19Power Supply(For E8267D with serial prefixes
