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5. OFF LINE OPERATION
There are two control functions and 14 information screens available in this state of the amplifier. You
can control the LCD contrast and backlighting or enable/disable the Auto-Operate feature. You can
also list the auto - protection signatures. The tube is not powered at all (only the micro-controller is
active) during these operations.
5-1. Contrast and Backlighting control
Press the PREV+NEXT buttons simultaneously and hold them for two seconds. The back-lighting of
the LCD will light and the Contrast=... B.Light=... screen will appear on the bottom line. Control
the contrast of the LCD using the PREV button in steps from 1 to 9. Control the backlighting of the
LCD using the NEXT button in steps from 1 to 5.
Press shortly the PREV+NEXT buttons in order to reach the auto-operate function (see next S.5-2),
or leave buttons unused for 20 seconds if you want to accept these selections only (in order not to
change Auto-Operate inadvertently).
5-2. Auto-Operate enabling and disabling
When enabled, this function will save manual actions and operating time for you. It will automatically
execute OPERATE commands every time when needed. The OPER button will be still functional, so
youll be able to change to standby and back to operate manually at any time. After returning to operate
the first time (by pressing OPER button again), the auto-operate feature will be restored.
In order to enable or disable the auto-operate at all, after a contrast and backlight selection (see the
previous S.5-1), continue with pressing shortly the PREV+NEXT buttons. The Auto Operate = ...
screen will appear on the bottom line. Use the PREV button to select OFF or NEXT to select ON.
Press shortly the PREV+NEXT buttons again to accept and return.
N O T E
If LCD back-lighting or contrast are too low, thus no characters are seen on the
LCD, execute S.5-1 first to obtain a readable display. All selections you make are
stored in the nonvolatile memory of the amplifier and are used at the next power-
on. If no selection is made for 20 seconds, the currently existing selection is accepted
and the function is left automatically.
5-3. Reading Auto-protection Signatures
On every Hard Fault protection trip of the amplifier, signature information is stored in its nonvolatile
memory. The 7 most recent auto-protection trip signatures related to the amplifier internal status are
stored there, which you can copy and forward to your dealer for diagnostics.
In order to read and to copy them press the OPER button while OFF LINE. The backlighting of the
LCD will light and youll see the beginning of the signatures list. Use NEXT and PREV buttons to
navigate through 7 pairs of screens. For each auto-protection trip there is a pair of information screens,
beginning with nA... and nB... where:
- n is the number of the event (nr.1 is the last, nr.7 is the oldest one);
- A and B mark the first and the second part of an information screen pair.
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