5. OFF LINE MODE
There is a control function and 14 information screens available in this state of the amplifier.
You can 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.
All menu selections you make are stored in the nonvolatile memory of the amplifier and
are used at the next power-on. If no menu selection is made within 20 seconds, the
current selection is accepted and the function is left automatically.
5.1. Display Contrast and Backlighting Control
The Contrast and Backlighting can be adjusted only if the display is LCD type (obsolete
since 2015).
Not operative in units furnished with OLED display.
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 Section 5.2 Auto-
Operate Enabling and Disabling), 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 keep the amplifier in OPERATE mode automatically. The OPER button will
be still functional, so you will be able to change to STANDBY and back to OPERATE manually at any time.
The AUTO-OPERATE function will be disabled temporarily when you enter the STANDBY mode but it will be
restored after you return to OPERATE by pressing the OPER button. See Section 4.2 Changing OPERATE and
STANDBY Modes.
In order to enable or disable the AUTO-OPERATE feature, after a contrast and backlight selection (see
Section 5.1 Display Contrast and Backlighting Control), 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 button to select ON. Press shortly the PREV+NEXT buttons again to confirm and return.
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