artisan 8640B - A9 and All Assemblies Removal and Disassembly; A10 Assembly Removal and Disassembly

Model 8640B TM 9-4935-601-14-7&P
A9 and A11 Assemblies Removal and Disassembly
SERVICE SHEET C
SERVICE SHEET D
A10 Assembly Removal and Disassembly Procedure
A10 Casting Cover Removal
1. Place instrument right side up and remove top cover (see Service Sheet F).
2. Remove fourteen pan-head screws (with lockwashers) that secure casting cover to casting (screws marked
with asterisk * - on cover).
NOTE
Note the location of the screws. The long screws vary in length.
3. Lift cover from casting.
A10A2 Removal
4. Remove twelve pan-head screws (with lockwashers) that secure A10A2 Assembly to casting. Remove
A10A2 RF Divider Assembly and A10A3 Riser Assembly by lifting at the riser.
NOTES
1. The A10OA2 Assembly can be extended for service by removing the A10A3 Riser
Assembly from A10A2 and installing A10A2 in the riser socket (A10A1XA10A3A and B).
Remove the riser evenly to avoid cracking the connector.
2. When replacing transistors on A10OA2, assure that the cans will not contact the casting
top cover.
A10A1 Access
5. Remove four pan-head screws (with lockwashers) that secure casting center section to casting.
6. Remove three power supply circuit boards (A18, A20, and A22) that are between A10 Assembly and rear
panel.
7. Remove casting center section.
NOTE
The A10A1 Assembly can be checked and adjusted by installing the A10A2 Assembly in the
riser socket (A10A1XA10A3A and B) and reinstalling the power supply circuit boards (A18,
A20, and A22).
A10A1 Removal
8. Turn instrument upside down and remove bottom cover (see Service Sheet F).
CAUTION
While working with and around the semi-rigid coaxial cables in the generator, do not bend
the cables more than necessary. Do not torque the RF connectors to more than 2 inch-
pounds.
9. Remove FM circuit boards (A5 and A7) and the A3A4 Connector Board Assembly (see Service Sheet F).
10. Disconnect four semi-rigid coaxial cables from bottom of A10 Assembly (cable W3 and A10A1J3, cable
W7 at A10A1J2, cable W5 at A10A1J1, and cable W8 at A10A1J4). A10A1J2 and J3 are located in area
occupied by FM circuit boards. A10A1J1 and J4 are located in front of A26 Assembly.
11. Remove four hex nuts and lockwashers that secure coaxial connectors A10A1J1 through J4.
12. Turn instrument right side up. Unsolder three feedthroughs at rear center of A10A1 Assembly (located to
right of two toroid inductors and to left of relay).
CAUTION
Be sure the terminals have been completely desoldered.
13. Remove the ten pan-head screws (with lockwashers) that secure A10A1 Assembly to casting. Remove
A10A1.
NOTE
If necessary, the bottom casting cover can be removed by removing four allen screws (with
lockwashers).
Reassembly
14. Reassemble A10 Assembly by reversing the procedures in steps one through 13.
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