HYDRA
Service Manual
3-12
3-18. Remove the Main PCA
With the IEEE-488 option (2620A) and the Memory PCA (2625A) or Memory Card I/F
PCA (2635A) removed, the Main PCA (H) can be removed. Parts referenced by letter
(e.g., A) are shown in Figure 3-4 (2620A or 2625A) or Figure 3-5 (2635A). Use the
following procedure:
1.
If it is still attached, remove the green power switch activator rod (J) extending from
the power switch on the Main PCA through the Front Panel Assembly. Squeeze the
end of the rod at the power switch and lift up; the bar disengages smoothly from the
switch.
2.
Using needle nose pliers, disconnect the display ribbon cable (G) on the Main PCA
(H) by alternately pulling up on each end of its connector. Avoid breaking the
alignment tabs on the Main PCA side of this connection. (This connector has already
been detached if the Front Panel Assembly was removed.)
3.
Detach the transformer connector at the Main PCA.
4.
Detach the Main-to-A/D Converter cable at the A/D Converter PCA.
5.
If installed, pull off the ALARM OUTPUTS and DIGITAL I/O terminal strips from
the Rear Panel.
6.
Remove the RS-232 connector screws (T) at the Rear Panel. Use a 3/16-inch nut
driver to loosen the connector securing hardware.
7.
If installed, remove the IEEE-488 connector. Use a 7-mm nutdriver to loosen the
two securing screws on the rear panel.
8.
Now remove the two screws (U) securing the Main PCA to the chassis. Slide the
Main PCA forward. Then, while matching the pca edge indentations to the guide
tabs on each chassis side, lift the Main PCA up and away from the chassis.
3-19. Remove the A/D Converter PCA
Use the following procedure to remove the A/D Converter PCA (V). Parts referenced by
letter (e.g., A) are shown in Figure 3-4 (2620A or 2625A) or Figure 3-5 (2635A).
1.
If necessary, remove the leads connecting the two front panel input terminals to the
A/D Converter PCA. Using needle nose pliers, pull and disconnect the wires at the
rear of the V
Ω
(red) and COM (black) input terminals. (These leads are already
disconnected if the Front Panel Assembly has been removed.)
2.
At the A/D Converter PCA, detach the cable leading to the Main PCA.
3.
From the Rear Panel, pull out the Input Module.
4.
Remove the three Phillips head screws (W) securing the A/D Converter PCA to the
chassis.
5.
Now slide the A/D Converter PCA forward to match the indentations in the pca
edges to the guides in the chassis. Then lift the pca out.
Summary of Contents for 2620A
Page 4: ......
Page 18: ...HYDRA Service Manual 1 2...
Page 48: ...HYDRA Service Manual 1 32...
Page 140: ...HYDRA Service Manual 3 16...
Page 234: ...HYDRA Service Manual 5A 34...
Page 236: ...HYDRA Service Manual 6 2...
Page 254: ...HYDRA Service Manual 6 20 2620A 1601 s63f eps Figure 6 3 2620A 2625A A1 Main PCA...
Page 258: ...HYDRA Service Manual 6 24 2635A 1601 s64f eps Figure 6 4 2635A A1 Main PCA...
Page 260: ...HYDRA Service Manual 6 26 2620A 4002 CKT 1 CKT 2 s65f eps Figure 6 5 A2 Display PCA...
Page 272: ...HYDRA Service Manual 6 38...
Page 274: ...HYDRA Service Manual 7 2...
Page 282: ...HYDRA Service Manual 7 10...
Page 284: ...HYDRA Service Manual 8 2...
Page 285: ...Schematic Diagrams 8 8 3 Figure 8 1 A1 Main PCA 2620A 2625A 2620A 1601 s88f eps...
Page 288: ...Schematic Diagrams 8 8 6 Figure 8 1 A1 Main PCA 2620A 2625A cont 2620A 1001 3 of 4 s73f eps...
Page 292: ...Schematic Diagrams 8 8 10 2635A 1001 2 of 5 Figure 8 2 A1 Main PCA 2635A cont s76f eps...
Page 293: ...Schematic Diagrams 8 8 11 2635A 1001 3 of 5 Figure 8 2 A1 Main PCA 2635A cont s77f eps...
Page 296: ...Schematic Diagrams 8 8 14 2620A 4002 CKT 1 CKT 2 Figure 8 3 A2 Display PCA s90f eps...
Page 300: ...Schematic Diagrams 8 8 18 2620A 1003 2 of 3 Figure 8 4 A3 A D Converter PCA cont s82c eps...
Page 301: ...Schematic Diagrams 8 8 19 2620A 1003 3 of 3 Figure 8 4 A3 A D Converter PCA cont s83c eps...
Page 302: ...Schematic Diagrams 8 8 20 2620A 1604 Figure 8 5 A4 Analog Input PCA s92f eps...
Page 304: ...Schematic Diagrams 8 8 22 2620A 1605 Figure 8 6 A5 IEEE 488 Interface PCA 2620A Only s93f eps...
Page 306: ...Schematic Diagrams 8 8 24 2625A 1606 Figure 8 7 A6 Memory PCA 2625A s94f eps...
Page 310: ...Schematic Diagrams 8 8 28...
