[C320-list] ST 60 Wind problems

[Warren Updike]

Jeff, here is something copied from Raymarine document on Testing the
ST50/60 Masthead Transducer
	"Red to shield should read 8 volts DC steady. This is the masthead
power supply, coming from the ST50/ST60 display head. If the head is
damaged, you may need to provide this power from another source to test the
masthead."
It appears the 8V is supplied by the display instrument to the masthead. If,
as you say, the other readings are Ok, it's a puzzle how this would be so.
Try checking it at the back of the display.
Here is something from another document:

Pin #	Color		Name				Description
1	Black		Screen			Ground (0 volts)
2	Red		+8 V				Supply to mast head
electronics
3	Blue		Wind Direction (sine)	sin(wind direction) | For
Pins 3&4: Voltage between 2 and 6 volts depending on the direction of vane
4	Green		Wind Direction (cosine)	cos(wind direction) |	
5	Yellow	Wind Speed			7 V with negative going
pulses

Warren and Pattie Updike
1994 C320 "Warr de Mar" #62

-----Original Message-----
From: JeffWillis111 at aol.com [mailto:JeffWillis111 at aol.com] 
Sent: Wednesday, August 13, 2014 9:04 PM
To: C320-List at Catalina320.com
Subject: [C320-list] ST 60 Wind problems

Hello All,
 
I did not want to hijack the other thread regarding Legacy AP problems  but 
it did get off subject slightly to a problem I have questions about.   the 
ST 60 wind display.
 
I have been trying to get my wind system going and checked the voltages at  
the junction box and on back of the display.  Yellow, green, and blue  
voltages are within spec but when checking Red I only get 3.93 volts and
from  
what I gather it should be around 8 volts?????  Any thoughts on this  
voltage????
 
I have not checked any voltages from Seatalk cables from AP control  head.  
 
Also, when trying to calibrate I cant get the "user calibration" to  
toggle.  It is currently set at "UC 0."   This needs to be  at "UC 1"
correct?  It 
also skips over the screen to set "Wind Speed  Calibration"  I do not have 
a speed transducer in operation.  Have  been relying on chartplotter SOG.
 
Thanks for your help,
 
Jeff Willis
ESPRIT #174