Service manual

CPU Assembly Connectors
A-6
Signal Definition
+5KBD 5 volt supply for keyboard assembly.
ACONLED AC on LED. Drives the AC indicator LED on the keyboard.
ground ground.
KEYIN0-KEYIN7 Sense lines for key contact scanning.
LED1 AUTO LED signal.
LED2 MANUAL (I, II, III) LED signal.
LED3 MANUAL (aVR, aVL, aVF) LED signal.
LED4 MANUAL (II, aVF, V2) LED signal.
LED5 MANUAL (V1 - V6) LED signal.
LED6 V Leads LED signal.
LED7 Filter LED signal.
LED8 ECG Size 10mm/mv LED signal.
LED9 ECG Size 20 mm/mv LED signal.
LED10 Chart Speed 50mm/sec LED signal.
LED11 ECG Size 5 mm/mv LED signal.
LED12 Chart Speed 10 mm/sec LED signal.
LED13 Chart Speed 25 mm/sec LED signal.
LED14 Chart Speed 5 mm/sec LED signal.
LED15 Low battery LED signal.
ONSTBY
Signal generated by key — active low. Initiates
the DRAM gate array during power-up.
ROWSA_0 Drive lines for key contact scanning.
ROWSA_1 Drive lines for key contact scanning.
ROWSG_0 Drive lines for key contact scanning.
On/Standby