5.6. Service Functions
By pressing the OPER and RTTY buttons simultaneously, the upper LED bar-graph is switched to the
SERVICE mode, which is indicated by both red bar-graph lights and the yellow G1 light illuminating. Pressing
the OPER and RTTY buttons together again will select additional service measurement functions. Pressing
them a final time will return the amplifier to the normal operating mode. These steps are detailed below:
a) Press the OPER and RTTY buttons together. The two red lights on the right side of the upper
bar-graph will illuminate to confirm that the amplifier is in the service mode. The yellow G1
light will also illuminate. The upper bar-graph should show a grid 1 current reading no higher
than 5 mA (5 LEDs illuminated);
b) Pressing the OPER and RTTY buttons once again will now illuminate the yellow G2 light. This
provides an approximate reading of grid 2 voltage. The scale is 30 V per a LED lighted. The
upper bar graph should show a voltage reading within the range of either 270-300 Volts (9-10
LEDs illuminated) for RTTY or 210-330 Volts (7 to 11 LEDs illuminated) for SSB and CW;
c) Pressing the OPER and RTTY buttons yet again will illuminate the yellow IP light. This
provides an approximate reading of combined plate current and grid 2 current. The reading
should be no higher than 500 mA (10 LEDs illuminated) for RTTY or 600 mA (12 LEDs
illuminated) for SSB and CW. The scale is 50 mA per a LED lighted;
d) Pressing the OPER and RTTY buttons a final time will restore the upper bar-graph to its
normal function of indicating peak forward power.
The Auto-Protection System will continue to operate in the SERVICE mode.
In case it is necessary to ship the amplifier, please, see Section 6.3 Storage and Shipment.
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