## Troubleshooting

If the instrument is malfunctioning, check to see if the symptoms correspond to any of the following.

The causes and measures for items without a mark are common to RS-232C, GP-IB, USB, and LAN.

### RS-232C/GP-IB is completely inoperable.

- Is the cable connected properly?
- Is the power of all connected devices turned ON?
- Is the correct cable being used?
- Are the communication conditions set properly? [RS-232C]
- Is the address setting of the instrument set properly? [GP-IB]
- Is the address the same as that of another device? [GP-IB]
- Is the IP address the same as that of another network device? [LAN]
- Has the USB driver been installed properly? [USB]

### Sometimes a service request is not generated. [GP-IB]

- Are the service request enable register and event status enable registers set properly?
- SClear all of the event registers with the *CLS command at the end of the SRQ process sub-routine. If the bit of an event is not cleared once, a service request is not generated for the same event.