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HP 70206A Line Fuse
A 6.3 A, 250 V line fuse is located inside the power receptacle on the back of the display.
The most common reason for an open fuse is improper setting of the line voltage selector;
however, internal problems can also cause a fuse to open. See Figure 2-5 for fuse removal and
replacement information.
Fault Indicators
HP 70205A Fault Indicator
The HP 70205A has one fault indicator, a blinking E in the status box in the lower-right
corner of the display. See Figure 5-1. Problems external to the display can cause the indicator
to turn on.
Blinking E
The E indicator in the status box in the lower-right corner of the display is the same as the
red LED marked ERR on other HP 70000 Series modules. Its purpose is to indicate an error
detected in the module or, in the case of the display, in any module (on HP-MSIB row 0) in
the system. A blinking E or ERR has a special meaning: it signifies that a problem on the
HP-MSIB backplane has been detected during system power-up which may prevent normal
communication (and hence, normal error reporting). Such a problem must be troubleshot
before any predictable system operation can take place.
Remove all other modules from the mainframe containing the HP 70205A display. Disconnect
all HP-MSIB cables from the rear of the mainframe and cycle power. If the E indicator on the
display screen still blinks, there is an HP-MSIB problem in the display or in the mainframe.
Obtain another HP 70000 module of any kind. Remove the HP 70205A display from the
mainframe and put the other module in the same slot. Apply power. If the ERR indicator on
the module blinks, most likely the problem is in the mainframe. Refer to the HP 70001A
Mainframe Installation and Verification Manual for more information about troubleshooting
the mainframe. If the second module powers up normally, most likely the problem is in the
display. Contact the nearest Hewlett-Packard Service Office listed in Table 1-5.
5-2
Troubleshooting
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