B.2 Normal Operation with Model 500 CPUs and No
Inhibit Cable
Normal system operation is with Model 500 CPUs and MS65A memory
modules installed, no H7242 inhibit cable, and no XMI-1 modules. When
power is supplied to the system under these conditions and the key switch
turned to Standby, the following H7206-B LEDs are lit:
• L1 (green) - +14V bias present
• L5 (red) - VAXBI H7215 fault
• L6 (red) - VAXBI H7214 fault
The green LEDs on the XMI-side H7214 and H7242 power regulators should
be lit. The green LEDs on both VAXBI power regulators will be off. When
the key switch is turned from Standby to Enable or Secure, L5 and L6
on the H7206-B should go out and the green LEDs on each VAXBI power
regulator will light.
If L5 and L6 do not go out, check that the control/status cable (17-01666-
01) for the VAXBI side is installed correctly. If it is not connected, LEDs
L5 and L6 (VAXBI H7215 and H7214 failure) on the power and logic unit
will be off, since the active pulldown to set the LEDs off comes from the
regulators.
Check that the +300V bulk power cable to the VAXBI side is connected at
the regulators and at the H7206-B (connector J3).
WARNING:
Never make or break +300V connections with power applied.
Disconnect input power and wait 2 minutes to allow the filter capacitors
to discharge (bleed down) to zero volts before making or breaking any
connections.
If L9 is lit, indicating a fault, and the XMI side is okay, check the interlock
2-pin Mate-N-Lok connector under the H7215 and recheck the VAXBI
door (listen for the faint click of the microswitch). Correcting the door
or interlock switch connection should automatically clear the fault without
your having to recycle power at the key switch or having to press the H7206-
B reset switch.
Since everything but the H7242 has been checked out, check the H7242, its
connection to the H7206, and any sequencing activity between the H7242
and H7214. Check the control/status cable to the H7242 and reseat if
necessary. Check that the +300V bulk power cable is attached to the H7242.
If the H7242 connection is not properly made, no other regulators on the
XMI side should run since the +300V is daisy chained through etch on the
H7214 and H7242 at the +300V input connector (that is, if the H7242 is
Power-Up Troubleshooting Procedures
B–3
Содержание VAX 6000 XMI Series
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