Reference Code
Description/Action Perform all actions before exchanging Failing Items
Failing Item
Axxx, Bxxx, Cxxx,
Dxxx, Exxx, F00x
Tape unit failure
Use online problem analysis and the 3490 Tape Unit service information to
continue analyzing the problem.
FFD5
Device error reported; tape I/O processor
Verify the following:
1.
That power is switched on in the 3490 Tape Unit Rack:
v
Set the 3490 Rack Unit Emergency Power Off switch to the On
position.
v
Ensure that the 3490 Rack Enable/Off switch is set to the Enable
position.
v
Press the 3490 Rack Power On button.
2.
Verify the following on 3490 Tape Unit:
v
The Channel Enable/Disable switches are set to the Enable position.
v
The Normal/Test switch is set to the Normal position.
v
The CU Online/Offline switch is set to the Online position.
v
The Drive Address Online/Offline switches are set to the Online
position.
v
The Drive DC Power switches are set to the On position.
If you are attempting to perform an IPL from the device that had the error,
verify that the drive control unit address switch has an address of
hexadecimal 7 and the drive unit address switch has an address of 0.
Use the 3490 Tape Unit service information to continue analyzing the
problem.
UHK0003
DHK0002
FFF6
Volume statistics; logged only
No action required. This reference code is logged for information only.
Table 2. Tape Unit Failing Items Details
Failing Item
Description
Document Description
05H3834
Interposer
Magnetic tape subsystem service information
61G8324
Terminating plug
Magnetic tape subsystem service information
DHK0002
I/O device
Use the sense bytes and 3490 MI to find the
failing items
EXTSCSI
External signal cable
Problem Analysis; Symbolic FRU Isolation
MHK0001
Tape
Magnetic tape subsystem operator’s information
MHKTMED
Defective tape
Magnetic tape subsystem operator’s information
UHK0003
I/O device not communicating
Magnetic tape subsystem operator’s information
UHKCLN
Tape unit needs cleaning
Magnetic tape subsystem operator’s information
UHKCNFG
Tape configuration detected by I/O processor;
not valid
Installation
UHKUSRT
System Operator/User
System operation information
3490
System Reference Codes
161
