3478A Disassembly Procedure - HP 3478A Technical Manual
Dilgital multimeter
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Also See for 3478A:
- Service manual (160 pages) ,
- Technical manual (149 pages) ,
- Operating instructions manual (103 pages)
Table of Contents
Mfr.
No.
0049D
01121
01295
0192B
03888
04713
06665
07263
07716
11236
12969
14936
24355
24546
27014
28480
56289
75915
designator column are available only for repair and
service of Hewlett-Packard Instruments.
5-12. 3478A DISASSEMBLY PROCEDURE
5-13. The following is the disassembly procedure for the
3478A.
a. Refer to Figure 5-2. Loosen the screw on the
3478A's top cover (MP6). Turn the instrument over and
loosen the screw on the bottom cover (MP10).
b. Remove the bottom cover by pulling the cover
toward the rear of the 3478A and away from the
multimeter.
c. Turn the 3478A right side up. Remove the top
cover by pulling the cover toward the rear of the 3478A
and away from the multimeter.
d.
See Figure 5-6.
panel wires from clamp MP26.
e. See Figure 5-4. Loosen and remove the screws
on both the left and right side side covers (MP4).
Remove the covers.
f. Refer to Figure 5-5. Loosen and remove screws
MP21 on the bottom plastic shield (MP23). Remove the
shield.
g. Refer to Figure 5-4. Loosen and remove screws
MP17 on the left side frame of the 3478A.
h. Refer to Figure 5-4. Loosen and remove screws
MP17 at the 3478A's side frames (on both the left and
right side). Remove the side frames.
Table 5-2. Code List of Manufacturers
Manufacturer Name
United Chemicon Inc
Allen-Bradley Co
Texas Instr Inc Semicond Cmpnt Div
RCA Corp Solid State Div
KDI Pyrofilm Corp
Motorola Semiconductor Products
Precision Monolithics Inc
Fairchild Semiconductor Div
TRW Inc Burlington Div
Cts of Berne Inc
Unitrode Corp
General Instr Corp Semicon Prod Gp
Analog Devices Inc
Corning Glass Works (Bradford)
National Semiconductor Corp
Hewlett-Packard Co Corporate Hq
Sprague Electric Co
Littlefuse Inc
Remove the front and rear
Address
Milwaukee WI 53204
Dallas TX 75222
Somerville NJ 08876
Whippany NJ 07981
Phoenix AZ 85062
Santa Clara CA 95050
Mountain View CA 94042
Burlington IA 52601
Berne IN 46711
Watertown MA 02172
Hicksville NY 11802
Norwood MA 02062
Bradford PA 16701
Santa Clara CA 95051
Palo Alto CA 94304
North Adams MA 01247
Des Plaines IL 60016
i. Unplug the HP-IB, Voltmeter Complete, External
Trigger, and Rear Panel Terminal Cables from the
mother board (A1 assembly).
j. Carefully remove the rear frame (MP18) and rear
panel (MP7) by pulling the frame toward the rear and
away from the instrument.
k. Refer to Figure 5-6. Using a small flat blade
screwdriver, insert the screwdriver blade into one slot of
the top trim (MP29) and remove the trim. Then loosen
and remove screws MP20 from the top side of the front
frame (MP13).
l. Refer to Figure 5-5. Loosen screws MP20 from
the bottom side of the front frame (MP13).
m. Remove the front frame (MP13) by pulling the
frame toward the rear and away from the instrument. Be
careful that the casting does not get tangled up in the
wires going to the front and rear terminals.
n. Refer to Figure 5-7. Loosen and remove screws
MP32 (also see Figure 5-8), from the bottom front panel
bracket (MP33) and remove the bracket.
o. Unplug the cable from the display.
p. Refer to Figure 5-7. Loosen and remove screws
MP34 from the front panel connector. Remove the front
panel assembly from the mother board (A1 assembly).
This completes the disassembly of the 3478A. If the
display is to be removed, continue with the next step.
q.
To remove the display from the front panel,
loosen and remove screws MP32 (see Figure 5-8) from
the front panel assembly. Remove the display. This
completes the front panel disassembly.
5-2
TM 11-6625-3071-14
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