E8257D/67D, E8663D PSG Signal Generators Service Guide 269Assembly ReplacementA2 DisplayA2 DisplayTools Required— T–10 driverRemoval ProcedureRefer to Figure 3-7 for instruments with serial number prefix< US/MY5XXX3XXX for this procedure.Refer to Figure 3-8 for instruments with serial number prefix≥ US/MY5XXX3XXX for this procedure.1. Disconnect the power cord.2. Remove the front panel. Refer to “Front Panel” on page 262.3. For serial number prefix < US/MY5XXX3XXX, disconnect the A2DS1W1cable from the A4 Inverter and discard/recycle the A4 Inverter (i.e., Thereplacement A2 Display does not need the old A4 Inverter).For serial number prefix ≥ US/MY5XXX3XXX, disconnect the A2W1 cablefrom the A2 Display.4. Disconnect the W8 ribbon cable from the A3 Power Switch by lifting thewhite tabs on the connector.5. Using the T–10 driver, remove the four screws (12) from the A3 PowerSwitch.6. Remove the A3 Power Switch.7. Using the T–10 driver, remove the ten screws (11) that secure the RFIshielding (10) to the front panel.8. Remove the metal shielding.9. Using the T–10 driver, remove the four screws (9) that secure the A2Display to the front panel.10.Remove the A2 Display.Replacement Procedure1. For instruments with serial number prefix < US/MY5XXX3XXX, reverse theorder of the removal procedure, except now the A2W1 cable is connectedstraight to the A31 Motherboard P12 since the A4 is now integrated intothe A2 Display.For instruments with serial number prefix ≥ US/MY5XXX3XXX, reverse theorder of the removal procedure.2. Torque all T–10 screws to 9 in–lbs.
