Scottsman ice sensor?

[KB Cool]

Got a call to a scottsman off on "No ice sensed"
Cleaned sensors and that was that. "good to go".
But it had me thinking if I cleaned these "eyes" and still got "no ice sensed".
How would I determine which sensor was bad (emitter or receiver) and or if the controller was the real problem. I have not worked on many Scottsman and my training on these consist of the red service handbook that I got from our supplier.
Thanks

[hvaccop]

Get a service manual from REp. or off of website which tells you the voltage you should read a particular parts of the bin control system. 99% chance just the eyes are dirty. Depends on how regular the machine is serviced and what type of establishment it in but the eyes will need to be cleaned on a regular basis.

[Dad]

Maybe this will help

http://www.scotsman-ice.com/general....ldownloads.xml

[KB Cool]

Thanks guys.
The online manuals are much more detailed than my handbook.

[wannafreeze]

from one of the manuals:
"Check bin controls. Check bin full light, if off,
place something between the electric eyes.
The bin full light should begin to blink (after 20
seconds of continuous blockage it will glow
steadily). If not, check operation of electric
eyes by unplugging #4 and jumping out the
two pins on the controller (first discharge any
static electricity by touching the cabinet with
the tool). If the bin full light blinks, replace the
bin controls. If it does not blink, replace the
controller. Note: Leaving #4 unplugged and
jumped for 20 seconds will shut the machine
down on a bin full (at the end of the harvest
cycle). It will restart after 4 minutes or may be
reset by pushing the Freeze butt"

[icehouse]

Thanks guys.
The online manuals are much more detailed than my handbook.

Contact Scotsman Tech Service and request their CD. Has everything on it.

[Diceman]

No ice sensed means it went into harvest and no ice was sensed falling into the bin.
Doubt it was the eyeballs, when they get dirty or go bad the machine goes off on bin full.
Could be controller.... but I think it is a different problem altogether.

[KB Cool]

No ice sensed means it went into harvest and no ice was sensed falling into the bin.
Doubt it was the eyeballs, when they get dirty or go bad the machine goes off on bin full.
Could be controller.... but I think it is a different problem altogether.

You know, I thought that too. Refer light was blinking twice whole time during freeze when I started machine. I watched it harvest and I did not get a bin blink. . After cleaning eyes it blinked rapidly as Ice fell.
Maybe you or somebody could give me some other ideas if that may have not been what's wrong. Will machine time out of harvest?

[KB Cool]

Also, I want to mention ice formation on left side of evap was terrible before I cleaned out the distributer and channels

[Diceman]

I just fixed 2 machines like that.
One water cooled had bad water reg valve, wide open, no head press and with the cold incoming water during winter, not much ice.
The other was just a dirty mess with a clogged water filter.
Put your gages on and see what's up, check the refrigeration cycle and all that jazz.

[KB Cool]

Okay, but I'll have to get a call back first on it. They have not called yet.
I know harvest is initiated by the float stem. But is there a "minium freeze timer Lock out". So say if my dump valve was leaking by and water level dropped in 30 seconds. Would the machine go into harvest right away or would it continue to stay in freeze for say 6 minutes and then harvest.
Thanks
Just trying to get a better handle on these machines.

[Diceman]

Whats the model number, the newer machines don't have a dump valve.
Your incoming solenoid could be leaking water in, seen that a lot, hard to make ice with fresh water pouring into the unit.
Maybe they called someone else.

[KB Cool]

CME 456.
And no, I checked incoming water and no leakage. Also checked drain. No water. If they did call somebody else. Oh well, I am sure I will run across
some other Scottsman CME's that I can "learn" on.