IBM 3745 130, Maintenance Information Procedures

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Diagnostics
Diagnostic Description
3745 Diagnostics
Two groups of diagnostics run on the 3745:
1. Automatic:
IML/IPL checkout diagnostics including MOSS
diagnostics.
2. Controlled:
Ÿ Internal function tests (IFTs)
Ÿ Wrap tests
Ÿ OLTs.
Diagnostics are run during the installation proce-
dure and when a fault is detected to isolate a
field-replaceable unit that caused the failure. They
are also executed after a repair is performed, to
check that the hardware area is working correctly.
They must be run before and after an EC or MES
has been installed in the area concerned.
Diagnostics may be run in offline mode when the
3745 is fully available or in concurrent mode. In
concurrent mode, the diagnostic must be selected
in the specific area and will run only in configured
units. These units must be available at that time.
Errors During Diagnostics
When the MOSS diagnostic program detects a
failure, a three-digit code is displayed on the
control panel.
When the internal function tests detect an error, a
reference code is posted on the 3745 console.
Diagnostic Monitoring
The controlled diagnostics are monitored by the
diagnostic control monitor (DCM) and the
command processor (CP).
The diagnostic control monitor is loaded when the
diagnostic utility program is selected from the
3745 function menu.
It automatically restricts the diagnostic testing to
the elements that are defined in the configuration
data file (CDF) and disconnected from the NCP.
Checkout Diagnostics
The checkout diagnostics are designed to test the
hardware of the CCU, IOC, Channel Adapter, CSP
part of the line adapter, TIC, and the PCC card.
For the CA, LA, and TIC, diagnostics are part of
the microcode and are located in the ROS of the
adapter itself. They run automatically at power
ON time before IML.
The cyclic PCC checkouts run when the machine
is powered ON and are successful when the
power control and service mode indicators are dis-
played.
For the CCU and IOC, the diagnostics are located
on the disk and run during IPL.
For the CA, TSS, HPTSS, and ESS, they are also
automatically run when the internal function tests
are started.
For the TIC, the token-ring wrap test is automat-
ically run at each TIC Open command from the
NCP. This TIC Internal Lobe Media tests the ring
up to the local wiring concentrator (IBM 8228), or
up to the point where it is unplugged before the
8228.
If an error is detected, the MOSS analyzes the
problem and presents a control panel code or a
reference code.
3-2
3745 Models 130 to 17A: MIP