154
c
HAPTER
8:
Service
Model 336 Temperature Controller
8.3 IEEE Interface
Troubleshooting
This section provides IEEE interface troubleshooting for issues that arise with new
installations, old installations, and intermittent lockups.
8.3.1 New Installation
1. Check the instrument address.
2. Always send a message terminator.
3. Send the entire message string at one time including the terminator.
4. Send only one simple command at a time until communication is established.
5. Be sure to spell commands correctly and use proper syntax.
6. Attempt both Talk and Listen functions. If one works but not the other, the hard-
ware connection is working, so look at syntax, terminator, and command format.
8.3.2 Existing
Installation No Longer
Working
1. Power the instrument off, then on again to see if it is a soft failure.
2. Power the computer off then on again to see if the IEEE card is locked up.
3. Verify that the address has not been changed on the instrument during a memory
reset.
4. Check all cable connections.
8.3.3 Intermittent
Lockups
1. Check cable connections and length.
2. Increase the delay between all commands to 50 ms to make sure the instrument
is not being overloaded.
8.4 Fuse Drawer
The fuse drawer supplied with the Model 336 holds the instrument line fuses and line
voltage selection module. The drawer holds two 5 mm × 20 mm (0.2 in × .79 in) time
delay fuses. It requires two good fuses of the same rating to operate safely.
Refer to Section 8.5 for details.
8.5 Line Voltage
Selection
Use the following procedure to change the instrument line voltage selector.
To avoid potentially lethal shocks, turn off the controller and disconnect it from AC power
before performing these procedures.
1. Identify the line input assembly on the instrument rear panel. See FIGURE 8-2.
2. Turn the line power switch OFF (O).
3. Remove the instrument power cord.
4. With a small screwdriver, release the drawer holding the line voltage selector
and fuse.
5. Slide out the removable plastic fuse holder from the drawer.
6. Rotate the fuse holder until the proper voltage indicator shows through
the window.
7. Re-assemble the line input assembly in the reverse order.
8. Verify the voltage indicator in the window of the line input assembly.
9. Connect the instrument power cord.
10. Turn the line power switch On (l) Refer to FIGURE 8-2.
FIGURE 8-1
Fuse drawer
Front view
Side view
Rear view
Fuse
Fuse
120
Содержание 336
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