4 Troubleshooting Procedures

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No Video Output on the System Monitor  page 4-3
                                       
Power On Does Not Succeed              page 4-3
                                       
Disk Drive Errors                      page 4-6
                                       
DSIMM Errors                           page 4-8

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Table 4-1 describes troubleshooting problems and corrective actions to take.

Table 4-1 Troubleshooting Tips

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Problem                              Action
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LED on front of system not lit. Verify that power switch is turned on and that the power cord is connected. If
both the power switch and the power cord are connected, shut down the system
and verify that the LED cable is connected. If the LED cable is connected, the
power supply or system board component may be defective. See Chapter 8,
"Major Subassemblies" or Chapter 11, "System Board and Component
Replacement."

Disk drive fails to boot or does Shut down system. SCSI controller may be defective. See Section 4.3.1,
not respond. "Verifying the Built-In SCSI Controller." If SCSI controller is OK, verify that
SCSI ID jumpers are set correctly and that every disk drive on the SCSI bus is set
to a different SCSI address. Verify that the configuration jumpers on the disk
drive are set correctly. See Chapter 9, "Storage Devices and Internal Cables."

Operating system does not Shut down system. Verify that SCSI ID jumpers are set correctly and that every
recognize disk drive at bootup. disk drive on the SCSI bus is set to a different SCSI address. Verify that the
configuration jumpers on the disk drive are set correctly. See Chapter 9, "Storage
Devices and Internal Cables."

No video output on monitor. Verify that the power cord is connected. Use a VOM to check voltages. See
Section 4.1, "No Video Output on the System Monitor."

Slow disk drive response. If many SCSI devices are connected to the same SCSI bus and if some of these
devices are "fast SCSI" devices, you can install an FSBE/S SBus card to the "fast
SCSI" devices to speed up performance.

Read, write, or parity error Replace the disk drive indicated by the failure message. The operating system
reported by the operating identifies the internal disk drive 0 (SCSI target ID 3) as sd0 and internal disk
system or applications. drive 1 (SCSI target ID 1) as sd1.

Power on does not succeed. The power supply may be defective. See Section 4.2.1, "Power Supply Test."
LEDs on keyboard do not light
up and there is no tone from the
keyboard when you turn on
system power.

Power on does not succeed. The The system board may be defective. See Section 4.2.2, "System Board Test."
system fails to initialize but the
LEDs on the keyboard light up
and there is a tone from the
keyboard.

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4.1 No Video Output on the System Monitor

1. Check that the power cord is connected to the monitor and to the wall outlet.

2. Verify that the wall outlet is supplying AC power to the monitor.

Use a VOM (Volt-Ohm Meter).

3. Verify that the video cable connection is secure between the monitor and the system video output port.

Use a VOM to perform the continuity test on the video cable.

4. If the power cord and video cable connection are good and there is still no video output, reseat or replace the video card for the monitor.

The video card is installed in one of the SBus slots in a S10 service code system. In a S10BSX service code system, the VSIMM is installed in one of the memory slots.

5. If the monitor power supply is internally fused, check the fuse.

The fuse could be blown.

4.2 Power On Does Not Succeed

1. Turn the system power switch off.

2. Check that the system power cord is properly connected to the system rear panel power receptacle and to the wall outlet.

3. Verify with a VOM that the wall outlet is supplying AC power to the system.

4. Turn the system power switch on and observe the keyboard.

The LEDs on the keyboard should briefly light up. You should hear a tone from the keyboard.

If you hear no tone or see no lights on the keyboard, the system's power supply may be defective. See Section 4.2.1, "Power Supply Test."

If you hear a tone and see lights on the keyboard, but the system still fails to initialize, see Section 4.2.2, "System Board Test."

4.2.1 Power Supply Test

1. Use a VOM (Volt-Ohm Meter) to check the power supply output voltages.

Place the VOM negative probe on one of the logic ground pins in the connector, and test the +12V, -12V, and +5.1V power pins individually with the positive probe (pins 1 through 7). See Figure 4-1.

Note - The system board connector (J1501) must remain connected to the power supply.

2. Replace the power supply assembly if any of the voltages are not present.

See Section 8.1, "Power Supply."

Figure 4-1 Power Supply Connector

Table 4-2 shows the pin assignments on the power supply connector.

Table 4-2 Power Supply Connector Pin Assignments

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Pin Number  Assignment  Pin Number  Assignment
---------------------------------------------------

                                    
1           +12V        10          Logic Ground
                                    
2           -12V        11          Logic Ground
                                    
3           +5.1V       12          Logic Ground
                                    
4           +5.1V       13          Logic Ground
                                    
5           +5.1V       14          Logic Ground
                                    
6           +5.1V       15          Logic Ground
                                    
7           +5.1V       16          Logic Ground
                                    
8           Power On    17          Power OK (reset)
                                    
9           Power Off   18          No Connection

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4.2.2 System Board Test

1. Connect a terminal to serial port A or use a

tip

To set up a tip connection to another workstation, see Section 3.3.1, "Setting Up a tip Connection to Another Workstation."

2. Press and hold the

Stop

(L1)

-

d

a. The Caps Lock key on the keyboard should flash on and off, indicating that the system is running the Power-On Self-Test (POST).

If the Caps Lock key fails to flash on and off after you have pressed and held the Stop (L1) -d keys, POST failed. MBus module 0 or the system board is defective.

b. To further troubleshoot the system board, see Section 4.2.2.1, "Caps Lock Key Fails to Flash On and Off During POST."

3. Observe the keyboard LEDs.

If a failure occurs during POST, an LED may light up. Table 3-1 in Chapter 3, "Power-On Self-Test (POST)" describes types of problems that occur when an LED on the keyboard lights up.

4. Replace the defective part indicated.

4.2.2.1 Caps Lock Key Fails to Flash On and Off During POST

1. Remove optional SBus cards and SIMMs.

2. Run POST again with only an MBus module in slot 0, a DSIMM in slot J0201, the power supply assembly, and the keyboard installed.

Remove all other parts to eliminate the possibility that parts you removed could cause the POST failure.

4.3 Disk Drive Errors

Table 4-3 presents disk drive error conditions and corrective actions.

Table 4-3 Troubleshooting Disk Drive Errors

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Symptom                             Corrective Action
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Read, write, or parity error Replace the disk drive indicated by the failure
reported by the operating message. The operating system identifies the
system or applications. internal disk drive 0 (SCSI target ID 3) as sd0 and
internal disk drive 1 (SCSI target ID 1) as sd1.

Drive fails to boot or does not SCSI controller may be defective. See
respond to commands. Section 4.3.1, "Verifying the Built-In SCSI
Controller." If SCSI controller is OK, the SCSI ID
jumpers or configuration jumpers may be set
incorrectly. Refer to Chapter 9, "Storage Devices
and Internal Cables."

Slow disk drive performance or If many SCSI devices are connected to the same
many "retry" system messages. SCSI bus and if some of these devices, such as the
1.05-Gbyte disk drive, are "fast SCSI" devices. you
may want to install an FSBE/S SCSI host adapter
card to the "fast SCSI" devices and put these "fast
SCSI" devices on a separate SCSI bus to speed up
disk drive response.

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4.3.1 Verifying the Built-In SCSI Controller

To verify if the built-in SCSI controller is defective, test the drive response to the probe-scsi command. To test additional SCSI host adapters added to the system use the probe-scsi-all command. Refer to
"probe-scsi, probe-scsi-all" in Appendix E, "Selected On-Board Diagnostics."

1. At the

2. At the

ok

probe-scsi

See the following example.

-------------------------------------------------------------

ok probe-scsi
Target 3
  Unit 0  Disk SEAGATE ST1480  SUN0424  Copyright  (c) 1991

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a. If the disk drive responds and a message is displayed, the system SCSI controller has successfully probed the devices.

This indicates that the system board is working correctly.

b. If a disk doesn't respond:

i. Verify that the SCSI target ID is set correctly. Make sure that every SCSI disk and other SCSI device on the SCSI bus has a different SCSI target ID.

ii. Verify that all SCSI cables and the SCSI terminator are connected securely.

iii. Check the SCSI cables to make sure there are no bent pins.

iv. If after checking the previous causes and have not found the problem, replace the unresponsive drive.

v. If the problem still occurs after replacing the drive, replace the system board.

vi. If replacing the disk drive and the system board does not correct the problem, replace the internal disk drive cable assembly.

4.4 DSIMM Errors

If the operating system, diagnostic program, or POST does not display a DSIMM location ("J" number) as part of the memory error message and the only available information is a physical memory address, use Table 4-4.

Table 4-4 DSIMM Slot and the Physical Target ID

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DSIMM Slot      Physical Memory  Physical Memory
------------------------------------------------

                                 
Location        Address Start    Address End
------------------------------------------------

                                 
J0201 (bank 0)  0000 0000        03ff ffff
                                 
J0203 (bank 1)  0400 0000        07ff ffff
                                 
J0302 (bank 2)  0800 0000        0bff ffff
                                 
J0304 (bank 3)  0c00 0000        0fff ffff
                                 
J0202 (bank 4)  1000 0000        13ff ffff
                                 
J0301 (bank 5)  1400 0000        17ff ffff
                                 
J0303 (bank 6)  1800 0000        1bff fff
                                 
J0305 (bank 7)  1c00 0000        1fff ffff

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Figure 4-2 DSIMM Slots Location

Note - The order of the banks in the table are not the same as the physical order of the DSIMM slots on the system board. The physical order of the slots is based on an alternating bank pattern: bank 0, bank 4, bank 1, bank 5, bank 2, bank 6, bank 3, and bank 7. See Figure 4-2.

Each bank allows enough address space to accommodate a 64 Mbyte DSIMM. If a 16 Mbyte DSIMM is installed in a bank, the unused addresses are "mapped out" by the memory management hardware. The physical memory starting address of any capacity DSIMM installed will always be as shown on
Table 4-4.