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Adapted from HP Service Sheet “D” WB0SMX

8640b Gear Set Replacement

DESCRIPTION

• A9, Peak De iation and Range Switch Assembly

A9 REMOVAL AND DISASSEMBLY PROCEDURE

1. Set PEAK DEV AT ON and RANGE switches fully ccw.

2. Remove PEAK DEV AT ON and RANGE switch knobs. The knobs are secure

with allen screws in the knobs.

3. Place instrument upside down and remove bottom cover (see Service Sheet

G).

Adapted from HP Service Sheet “D” WB0SMX

8640b Gear Set Replacement

4. Remove two nuts that secure A9 Assembly to front panel (located at switch

bushings).

Adapted from HP Service Sheet “D” WB0SMX

8640b Gear Set Replacement

5. Remove connectors A9A1P1 and A9A2P1 from jacks on A13 Assembly. Lift

rear of A9 Assembly until coupler slides apart. Gently slide the assembly back

and up to remove. Re-install assembly by setting both switch shafts fully ccw

and reversing the procedures in steps one through six. f Option 003 is

installed, remove both cables from the Reverse Power Assembly.

NOTE

The detents of both A9 Assembly and AlO Assembly switches must

align and

correspond to the same positions. Check that the actual RF output

frequency

agrees with the counter indication on all ranges. Refer to paragraph 5-

29.)

Adapted from HP Service Sheet “D” WB0SMX

8640b Gear Set Replacement

A9A1 and A9A2 Remo al

NOTE

For the following steps, orient the switch assembly with A9A1W1 and

A9A2W1 up.

Numbers in parentheses refer to items in the accompanying illustrated

parts breakdown.

6. Set both shafts fully ccw, and desolder the three wires attached to the

potentiometer terminals.

Adapted from HP Service Sheet “D” WB0SMX

8640b Gear Set Replacement

7. Remove retainer ring (49) at front of potentiometer shaft, and slide

potentiometer and its mounting plate out to the rear of the switch.

Adapted from HP Service Sheet “D” WB0SMX

8640b Gear Set Replacement

8. Remove retainer ring (1), washer (25), spring (24), and 4-contact rotor (23)

at rear of switch.

Adapted from HP Service Sheet “D” WB0SMX

8640b Gear Set Replacement

9. Remove two machine screws with lock and >at washers (31, 34, and 35) at

right rear of switch. Remove two machine screws (2 and 8) and accompanying

spacers (18) located at front left of switch.

Adapted from HP Service Sheet “D” WB0SMX

8640b Gear Set Replacement

10. Slide A9A2 Assembly (36) and gear mounting plate (37) o? of detent

shafts.

11. Slide T-shaft (17) with its accompanying combination gear (19) and planet

gears (15 and 42) o? of solid shaft (part of 50).

Adapted from HP Service Sheet “D” WB0SMX

8640b Gear Set Replacement

12. Loosen setscrews and remove combination gear (13) from solid shaft.

Adapted from HP Service Sheet “D” WB0SMX

8640b Gear Set Replacement

13. Loosen setscrews and remove spur gear (40) from hollow shaft (part of

47).

Steps 14 and 15 may be skipped at this point, if you are only replacing the

gearset. You have full access to the gears without further action...

14. Remove two machine screws (46) at front right of detent mounting plate

(4), and remove P.C. board support (41).

15. Slide A9A1 Assembly (11) o? of detent shafts.