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8642 Common Devices
Front Panel
720 Status LEDs and Information Panel
Status LEDs
Green = proper operation Yellow = alert condition
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LED#
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Definition
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1
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Hard disk drive activity
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2
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DASD error
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3
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Processor Complex Error
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4
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Color green (POWER GOOD)
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5
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Color green (POWER Enabled)
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6
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Color green (All subsystems good)
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Error Codes
Corollary Errors (CP,TP,EP,IP,FP,HALT)
PCI Errors (DDDD DD S
0 VVVV IIII)
General Errors
Liquid Crystal Display
The Liquid Crystal Display (LCD) on the front operator panel
contains a 2-line by 16-character LCD (front panel display) driven by the
80C752 microprocessor. The front panel display receives and transmits ASCII
characters. The LCD supports the upper-and lower-case ASCII character set.
Errors detected by the computer might be displayed on
the LCD and/or on the standard display attached to the computer. This is
helpful when a display is not attached to the computer or the attached
display is inoperative.
LEDs - System Board and Adapter
LED(s) are located on planar, bridge, processor, and memory
card.
| Component |
LED On |
LED Off |
| Planar Slot LEDs: B1 (bridge card
slot) |
During / after normal initialization of bridge card |
-SW problem preventing initialization of card
-Defective LED
-Defective bridge card |
M1
(memory card slot) |
During initialization of memory card |
Successful initialization of memory card complete |
M2/P1
(w/ memory card installed) |
During initialization of memory card |
Successful initialization of memory card complete |
M2/P1
(w/ processor card installed) |
During initialization and activity on processor card |
- No activity on processor
- SW problem preventing initialization of card
- Defective LED
- Defective processor card |
P2 thru P6
(with processor card installed) |
During initialization and activity on processor card |
-No activity on processor
- SW problem preventing initialization of card
- Defective LED
- Defective processor card |
| Micro Channel slots |
When computer is powered-off |
When computer is powered-on |
| Bridge card LED |
During / after normal initialization of bridge card |
- SW problem preventing initialization of card
- Defective LED
- Defective bridge card |
| Memory card LED(s) |
During initialization of memory card |
Successful initialization of memory card complete |
| Processor card LED(s) |
During initialization and activity on processor card |
-No activity on processor -SW problem preventing initialization of
card
-Defective LED
-Defective processor card |
I²C (Inter-Integrated Circuit)
The I²C (Inter-Integrated Circuit) bus is a serial
bus that is used in the PC Server 720 to monitor and control several peripheral
functions within the machine. The bus is driven through a VLSI module on
the system board. A service processor on the system board (based on the
Intel 83C552 micro-controller) controls and monitors these functions within
the machine through the I²C bus. These include:
The front panel LCD
The front panel power controls
Detecting the setting of the SCSI ID
jumper on the hot-swap backplanes
Reading the voltage and temperature
sensors on the planar (viewable using NetFinity)
Controlling the three fans mounted behind
the drive bays
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