Here we go again!!!!!!!!!!!!!!!!!!!!!!!! Will not accept any money, coin or bills, and displays "sold out" occasionally. The bill lights flash twice and pause, and the coin light does the same. When you press a vend button it displays "try another selection" when it should display the set price. Ahh but when I try to enter daignostics (HD) it displays a code "55-7" or "SS-7". Then when I press a vend button it displays "HD", but will not go into diagnostics.......oh no!!!!!!!!!!!!!!!!
Ive tried unpluging the unit in hopes it would reset but no luck. I removed the main board and re-installed it, but no good.
Maybe I should just replace the main board and the coin changer.........................................................................................

I'd go all out and get a new mech and a new main board. It will be much easier to solve your problem that way. If the changer isn't tuning right, then you may have board problems inside the changer. Try these first:

-Complete the tuning procedure and power down, then power back up the unit. See if it made a difference regardless.

-If the above doesn't work, try the normal tuning procedure again, and press the escrow return lever a few more times at the end. See if the nickel tube ejects. If nothing changes, replace the changer and see if there is a difference.

If you don't have any extra changers, I can ship one out within 12 hours of you placing an order for $79 plus $14.20 expedited shipping. It would be easier then looking and waiting for one somewhere else. Just an offer! I have 9300-Ls and TRC-6000s available. 970-283-5634.

Well I checked the machine tonight and it works fine...................................I guess I'll never really know whats wrong with it unless I start throwing parts at it.

OK, I did the tuning procedure but when I got to "nickel tube should eject once", it didn't. I tryed this procedure twice with the same results. I then unplugged the whole machine, went into "diag", went to "coin mech test", and it showed the value of the coins I inserted, and ejected them upon my request. Now everything works fine.
I don't understand why this machine does this. My usual problem with this machine is that it occasionally will not accept any money, and when any selection is pressed it displays "try another selection".
What should I do the next time?

Ok, now I'm really getting frustrated with this s***. It's doing the same 'old' thing again. No money accepted and "try another selection". Here is what the lights are doing:

#1 With the outter door open and the inner door open there are no lights on the outside of the bill accepter, and the red light on the inside of the bill accepter flashes 2 times, pause, 2 times, pause, ect.

#2 With the outter door open but the inner door switch pressed, the outter bill accepter lights flash 1, pause, flash 2, pause, ect., and the inner red light flashes 1 long, then 1 short, ect.

I went through "diag" again to check the bill accepter and coin mech, and both work as they should from there.

WHAT'S UP WITH THIS MACHINE?????? NEED MORE HELP!!!!!

Here is the tuning procedure:

-Remove power to the changer.

-Unlatch and remove or lower the acceptor, but keep it plugged into the changer.

-Near the bottom of the flight deck board behind the acceptor, you will find two metal pins protruding out of a small opening in the board cover.

-Using a screwdriver, short those two pins with the screwdriver by touching them both at the same time with the driver point.

-Hold the screwdriver in place, and apply power to the unit.

-Hold screwdriver in place for about 5 seconds after applying power, then remove and shut the acceptor as normal.

-Insert slowly in this order, 2 nickels, 2 dimes, 2 quarters, and 2 dollar coins. If you do not want the unit to accept dollar coins, then instead of inserting two of them at the end, press the escrow return lever twice.

-After the return lever has been pressed twice, or the last two dollar coins inserted, then the nickel tube should eject once.

-Turn off the power, and reapply. Test the unit.

NOTE:

During the tuning procedure, ALL coins should drop all the way through the changer, and none should be accepted. If some are accepted, then you did not short the pins properly. Cut the power, and try again.

Also, instead of buying a whole new acceptor, you could just buy the acceptor gate and replace that. It is harder than replacing the whole acceptor, but it is about $15.00-$25.00 cheaper depending on where you buy your parts. We sell the acceptors for the 110 volt units for $30.00 each, and the gates for $16.00.

OK, I did the tuning procedure but when I got to "nickel tube should eject once", it didn't. I tryed this procedure twice with the same results. I then unplugged the whole machine, went into "diag", went to "coin mech test", and it showed the value of the coins I inserted, and ejected them upon my request. Now everything works fine.
I don't understand why this machine does this. My usual problem with this machine is that it occasionally will not accept any money, and when any selection is pressed it displays "try another selection".
What should I do the next time?

I believe the coin mech for the DN600 would be a MEI TRC6000 or a Coinco 9300L. They are controller mechs that work with multi-price machines. They are 110VAC. The unit you have should have a label on the side of the mech giving the model number, serial number and voltage. The "hot glue" looking repair to the magnetic disc is a common practice for repairs. I don't believe that would be the problem alone. I think you should find a replacement mech for about $60 online.

Hope this helps you

I forgot to mention that the disc is broken and loose. You can see the windings and they are loose and broken. It looks as though the repair failed to keep the disc in place, allowing it to move and breaking the tiny wires. Unless by chance the wires were making contact sometimes, and sometimes not. This hopfully would explain why this unit would stop taking any money and display "try another selection" on all buttons.