This section provides the most common repair procedures for the
Enterprise 420R. The written procedures below are links to the 
Sun Enterprise 420R Server Service Manual.
| Component |
Tips |
| CD-ROM Drive |
|
| CPU Module |
-
Tuning the ecache_scan_rate parameter of the Solaris
cache scrubber provides improved Ecache parity error protection on
non-mirrored SRAM UltraSPARC II-based systems (FIN I0755-1).
-
OS mapping versus physical location of CPU modules
for E420R, E450, U80 and Netra t1400/t1405 systems may lead to incorrect
module replacement (FIN I0749-1).
-
The current diagnostic procedure to
identify the faulty CPU module from CPU Ecache parity errors is flawed
(FIN I0570-3).
- 440MHz and 450MHz UltraSPARC II Modules in Ultra 60/80, Enterprise
220R/420R and Netra t platforms may experience Red State Exception,
Send Mondo Timeout and hard hangs (FCO A0208-3).
|
|
Disk Drive
|
-
Improved drive firmware will reduce the incidence
of HDI failures on IBM Discovery disk drives (FIN I0955-1).
|
| Memory |
|
| Memory Riser Assembly |
- See Memory Riser Assembly Damage
Caution.
- System initialization failures are sometimes being diagnosed incorrectly
due to an improperly installed Memory Riser card (FIN I0607-1).
- Failure to properly assemble the Memory Riser to the correct torque
setting can cause intermittent memory related system problems (FIN I0537-2).
|
| NVRAM/TOD Module |
|
| PCI Card |
- Ultra 80 system board based systems may panic at boot time with certain
PCI Bus configurations (FIN I0665-1).
-
SunPCi II and SunPCi IIpro cards may not respond
after rapid/successive power cycling (FCO A0186-1).
- Any PCI card may not seat properly and will cause the PCI card not
to be recognized by the system, rendering that PCI card inoperable (FCO
A0168-1).
- A host system using the 375-0040-01 or -02 FC100/P FC-AL PCI card
to attach to FC-AL storage (StorEdge A5x00 and A3500) may experience
loop errors, which may affect data access to that storage (FCO A0164-1).
|
| Power Distribution Board |
|
| Power Supply |
- Improper service procedures with the E220R/E420R power supplies could
result in system downtime. In addition, under certain circumstances,
the hot swapping functionality for the redundant power supplies may
fail (FIN I0666-1)
|
| Removable Media Assembly (RMA) Backplane |
|
| System Board |
|
| Tape Drive |
- The peripheral D.C. power cable (530-2864-02) is too short to allow
the tape drive to be connected to D.C. power (FCO A0166-1).
|
|
UltraSCSI Backplane |
|
