IEEE-488 Option -05
General Maintenance
7
7-5
7-7. IEEE-488
Transceivers/Connector
The IEEE-488 Transceivers (A5U2 and A5U3) are octal transceivers that are specifically
designed to exhibit the proper electrical drive characteristics to meet the IEEE-488
standard. These transceivers are configured to match the control signals available on the
IEEE-488 Controller. Assuming that A5U1-33 is always high, Table 7-2 describes the
transceiver direction control. The IEEE-488 Transceivers connect to a 24-position
connector (A5J2), which mates with the ribbon cable leading to the IEEE-488 connector
mounted at the rear of the instrument chassis.
Table 7-2. IEEE-488 Transceiver Control
TRANSCEIVER
TE = 0 (LISTENER)
TE = 1 (TALKER)
DI01..DI08
SRQ
ATN
EOI
-
DAV
NRFD
NDAC
IFC
REN
Receiver
Transmitter
Receiver
Receiver
Receiver
Receiver
Transmitter
Transmitter
Receiver
Receiver
Transmitter
Transmitter
Receiver
Receiver (ATN = 0)
Transmitter (ATN = 1)
Transmitter
Receiver
Receiver
Receiver
Receiver
7-8. General
Maintenance
7-9.
Removing the IEEE-488 Option
Remove the instrument cover as shown in Figure 7-1. Then remove the IEEE-488 Option
with the following procedure:
Note
Parts referenced by letter (e.g., A) are shown in Section 3 (Figure 3-4.)
1.
From the bottom of the instrument, locate the IEEE-488 PCA (N). This pca is
connected to the front of Main PCA, with a ribbon cable (O) leading across both
pca’s to the Rear Panel. Refer to Figure 7-1.
2.
Use needle nose pliers to disconnect the 24-line cable assembly at the IEEE-488
PCA, alternately pulling on each end of the cable connector. Leave the other end of
this cable attached to its Rear Panel connector.
3.
Remove the 6-32, 1/4-inch panhead Phillips screw (P) securing the IEEE-488 PCA.
See Figure 7-1.
4.
Disengage the IEEE-488 PCA by sliding it away from the Main PCA.
Summary of Contents for 2620A
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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...
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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...
