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AARON 1250 CONTROL SIGNAL INPUTS AND OUTPUTS
The following table lists the important input and output signals. From a troubleshooting standpoint, the absence
(and presence) of these signals will help you isolate problems.
Signal Name Description
PAD_SNS_ERROR This is the input signal from the Pad Sense Module that
informs the system logic that a pad sensing error has
occurred.
When a pad sense error occurs, a logic 1 (5 VDC) is sent
to the system logic section.
PAD_NSED This is an input signal from Pad Sense Module that
informs system logic that a single plate Patient Return
Electrode is attached to the front jack strip.
When the Pad Sense Module senses the presence of a
single plate patient return electrode, a logic 0 (0 VDC) is
sent to the system logic.
PAD_SED This is an input signal from Pad Sense Module that
informs the system logic that a split plate Patient Return
Electrode is attached to the patient.
When the Pad Sense Module senses the presence of a split
patient return electrode, a logic 0 (0 VDC) is sent to the
system logic.
AUD_DRV This is an output signal from the system logic that
generates the activation tones for all modes of operation.
A 1 kHz square wave is generated whenever cut or blend
mode is activated. A 2 kHz square wave is generated when
the coagulation, fulguration, or bipolar mode is activated.
This signal is used by the audio circuit.
ALM_DRV This is an output signal from the system logic that
generates a 2 kHz / 1 kHz square wave for activating the
alarm siren.
This signal is used by the audio circuit.
AUX_RLY_DRV This is an output signal from the system logic that controls
the accessory relay on the back panel.
41 Ser vice Guide • Aaron 1250