Raytheon ST60, Service Manual

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Part 1. ST60 Instruments – Chapter 1. Speed
A22001
4 ST60 Instruments Service Manual 83142-1
ST60 Speed PCB details
Input/Output signals
(refer to Figure 2. ST60 Speed circuit diagram)
Rear case Signal Description
connection
A (Red) BATT+_2 Nominal 12V DC supply
B (Screen) BATT-_2 OV
C (Yellow) STALK_2 Intermittent streams of (nominal) 12V pulses
D (Red) BATT+ Nominal 12V DC supply
E (Screen) BATT- OV
F (Yellow) STALK Intermittent streams of (nominal) 12V pulses
G (Red) 12V_SPD Approximately 11.2V DC out
H (Green) SPD With transducer attached, spinning paddle-wheel produces pulses
approximately 11.2V DC in amplitude @ 5.5Hz/Knot.
J (Screen) OV OV
K (White) TEMP With transducer attached, voltage here is dependant on
temperature. Approximately 1.8v at 0 degrees C.
L (Brown) OVANA OV
Rear case connections to ST60 Speed instrument
D4480-1
SP
EE
D
D
EP
TH
L K
J
H
G
A
B
C D E
F