1401. My Gemini console beeps, system does not start.

Check the following areas:
 

1. Does the fan blower work?
    
2. Is the interlock switch inside the blower open?
    
3. Does the 5 V power supply meet specification?
    
4. Is the power supply LED and heat sensor board defective?
    

1402. My XL, VXR, Gemini (w/o Sun Host computer) system does not bootup.

1. If the bootup sequence stops after a few lines:

   The problem may be in the CPU, hard disk, controller, and/or 5 V or 12 V power supplies.
   Boot from the floppy drive using the system generation #0 disk. If the system can boot from the floppy, the problem is in the hard disk and/or controller. If the system can not boot from the floppy, the problem may be the CPU or power supply.

2. If the bootup stops in the middle or toward the end of the bootup sequence:

   Read the error message in detail to find out where the error stops and refer to the address map to locate the problem.

1403. The computer says setup is complete, but the console hardware is not setup.

This is an indication of either a power supply or AP bus problem.

1. Test the power supply. Replace a bad power supply.

    

2. Check the AP bus cable and all of the boards that are on the AP bus.

   To troubleshoot an AP bus problem:

   • Pull out the RF Control boards that contain AP bus chips one at a time to find out which board is shorting out the AP bus line. This step does not work with Gemini Systems.

      

   • Disconnect the cable from the PTS, Relay Driver board (Inova or Unity Plus systems), RF Attenuator Interface board (Unity Systems).

If the above steps fail to fix the problem, then the problem may be in the Data Acquisition Controller board (Inova Systems) or the Acquisition Controller board/Output board (VXR, Gemini, Mercury, Unity, Unity+ Systems).

1404. What is the maximum ripple voltage for the console power supply?

1. Inova, Unity Plus, Mercury, Gemini systems:
    

   Digital power supply	about 20 mV
   RF power supply	about 100 mV

    

2. Unity, VXR, XL systems:
    

   Digital power supply	about 100 mV.
   RF power supply	up to 1.5 V depending on the system load.

There is no regulation at the power supply level. The boards are individually regulated.

1405. System stops working after a few minutes.

This is an indication that there is either a load or a thermal problem. Check for any bad fans or improperly loaded power supplies. If this is not the cause, check for short circuits on the individual boards.

1406. The console fan area is very noisy.

Verify whether the noise is from the fan or power supply.

1. If an individual fan is noisy, replace the fan.
2. Inspect the fans for foreign material. Clean if necessary.
3. If the noise is from the power supply, replace the power supply.

1407. The main switch is up, but the system is not running.

Inspect the following items:

1. After pulling the white switch up, it is necessary to momentarily press the green button (for Inova, Unity, Unity Plus, VXR, XL Systems).

    

2. Check the console input line voltage.
   110VAC Sun Computers, Gemini, Mercury consoles
   220VAC Inova, Unity, Unity Plus, VXR, XL consoles.

    

3. Check the line filter and/or line relay (Inova, Unity, Unity Plus, VXR, XL systems).

1408. What are the RF and digital supply voltage specification tolerances?

1. Inova, Unity Plus, Mercury, Gemini systems:

   Digital power supply	± 0.5 V
   RF power supply	± 2 V

    

2. Unity, VXR, XL systems:

   Digital power supply	± 0.5 V
   RF power supply	voltage output depends on the system load.
   There is no regulation in the power supply, the regulation is on the individual boards.

1409. The power supply indicator does not light or is very dim.

This indicates that either the power supply is defective or that there is a defective board loading power supply.