GE CT-9800

GE MEDICAL SYSTEMS CT 9800 QUICK SYSTEM
Rev. 1 Direction 18000
8-1-10
TABLE 8-2 (Continued)
DIB STATUS BITS DECODE
BIT NAME WHAT TO DO
7 NOT USED Should be a 0. If always = 1, the DISK CONTROLLER Board is at fault.
8 Illegal Address An illegal Cylinder or Surface address was received by the Disk Drive. This bit
should always be a 0. If set, possible problems are:
• DRIVE LOGIC Board
• ADAPTER 1 Board
• DISK CONTROLLER Board
• Cabling from the CPU Backplane to the Adapter
• Cable from the Adapter to the Disk Drive
• ADAPTER 2 Board
9 Illegal
Command
An illegal command was received by the Disk Drive. This bit should always be 0.
If set, possible problems are:
• DISK CONTROLLER Board
• ADAPTER 1 Board
• DRIVE LOGIC Board
• Cabling from the CPU Backplane to the Disk Drive
• Cable from the Adapter to the Disk Drive
10 Power Fault This bit should always be a 0. Check the LED’s on the Drive Power Supply.
11 Pak Unsafe A fault has occurred which is determined to be unsafe for the disk pack.
This bit should always be a 0. If set, the heads should be unloaded. Then
check the LED‘s on the DRIVE LOGIC Board. If the heads did not unload, the
error message is false. Possible problems are:
• DRIVE LOGIC Board
• ADAPTER 1 Board
• DISK CONTROLLER Board
• Cabling from the CPU Backplane to the Adapter
• Cable from the adapter to the Disk Drive
12 Positioner Fault
occurred
A positioner fault has occurred. This bit should always be a 0. If set, check
the DRIVE LOGIC Board LED’s to find the cause of the problem. Possible
causes are:
• Disk pack servo surface defective
• Bad Servo head
• SERVO CLOCK Board
• HEAD ANALOG Board