Agilent Technologies 8640b Manual Download Page 1

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Adapted from HP Service Sheet “D”

WB0SMX

8640b Gear Set Replacement

DESCRIPTION

• A9, Peak Deviation and Range Switch Assembly

A9 REMOVAL AND DISASSEMBLY PROCEDURE

1. Set PEAK DEVIATION and RANGE switches fully ccw.

2. Remove PEAK DEVIATION 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).

Summary of Contents for 8640b

Page 1: ...tion and Range Switch Assembly A9 REMOVAL AND DISASSEMBLY PROCEDURE 1 Set PEAK DEVIATION and RANGE switches fully ccw 2 Remove PEAK DEVIATION and RANGE switch knobs The knobs are secure with allen scr...

Page 2: ...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...

Page 3: ...remove Re install assembly by setting both switch shafts fully ccw and reversing the procedures in steps one through six If Option 003 is installed remove both cables from the Reverse Power Assembly N...

Page 4: ...9A2 Removal 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 fu...

Page 5: ...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...

Page 6: ...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...

Page 7: ...eet D WB0SMX 8640b Gear Set Replacement 9 Remove two machine screws with lock and flat washers 31 34 and 35 at right rear of switch Remove two machine screws 2 and 8 and accompanying spacers 18 locate...

Page 8: ...D WB0SMX 8640b Gear Set Replacement 10 Slide A9A2 Assembly 36 and gear mounting plate 37 off of detent shafts 11 Slide T shaft 17 with its accompanying combination gear 19 and planet gears 15 and 42...

Page 9: ...Adapted from HP Service Sheet D WB0SMX 8640b Gear Set Replacement 12 Loosen setscrews and remove combination gear 13 from solid shaft...

Page 10: ...ollow 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 fr...

Page 11: ...ointing to the top of the switch Mount the hollow shaft on the right side When assembly is complete check to be sure the shafts do not bind against the P C boards If the shafts bind loosen mounting sc...

Page 12: ...P Service Sheet D WB0SMX 8640b Gear Set Replacement b Set detent shafts fully ccw c Install both the 3 contact rotor 9 and the 2 contact rotor 43 with contacts aligned vertically and toward the bottom...

Page 13: ...ear 4 contact rotor with contacts aligned vertically and pointing toward the top of the switch This adjustment is made by loosening the set screws on the combination gear 13 to reset the rotor positio...

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