Technical data

• MDM checks terminal interfaces (but not terminals) by means of
feedback connectors.
If your devices pass the tests but you still experience problems, call your
Digital service representative for further testing.
If you require more complete diagnostic testing, purchase the MicroVAX
Maintenance Kit. That kit includes a system maintenance guide and the
service diagnostic tests. The MDM version you receive with your system is
a subset of the service version.
CAUTION: Only qualified service personnel should use the service
diagnostic tests.
3.2 Preparing to Run MDM
Running MDM on some systems requires additional or special procedures:
Read Section 3.2.1 if you plan to run MDM on a diskless or tapeless
system.
Read Section 3.2.2 if you plan to install MDM on a hard disk or RF-
series Integrated Storage Element.
Read Section 3.2.3 if you plan to run MDM on a dual-host system.
You can run MDM on an RRD-series disc drive by using the MDM CDROM
Kit.
3.2.1 Preparing to Run MDM on a Diskless or Tapeless
System
To run MDM on a diskless or tapeless system that is part of a local area
network, you must:
• Obtain a MicroVAX Ethernet Server Customer Diagnostics Kit.
• Run MDM using the diagnostics in that kit, labeled MV DIAG ENET
CUST.
Refer to the MicroVAX Diagnostic Monitor Ethernet Server User’s Guide at
this time. After you install and downline load MDM, refer again to that
manual for instructions on running MDM.
NOTE: If you have a diskless or tapeless system that is not part of a local
area network, you cannot run MDM. To diagnose problems, call your Digital
service representative.
3–2 VAX 4000 Model 200 Troubleshooting and Diagnostics