Hoshizaki control board no lights

[fixbear]

OK, it takes the machine a minimum of 3 min 10 seconds to start. Also if you have a mechanical bin full switch, And it is open, it will not start. But what really bothers me is that you have no lights on the board. This means one of too things. The machine is getting to high of voltage and has locked itself down till corrected or you have lost the low voltage transformer power to the board.

I have no idea of your capabilities or testing equipment. But I can provide you with the service manual so that you can understand how it worksHOS-KM-500MAH_sm.pdf (static-pt.com)https://static-pt.com/modelManual/HOS-KM-500MAH_sm.pdf?v=1655476605484

[fixbear]

If you go to page 32 of the service manual, you can follow the bin switch and fuse that supply the low voltage transformer that powers the board.

[fixbear]

I forgot to mention, if you have power out of the low voltage transfomer, but the board does not power up. Check the clean water valve interlock switch. Clean valve should be off when you turn the switch to ice. Your video shows it as on.

[Tropicalice]

Thank you for replying
I have tested the bin control for continuity and all seems good .

My dmm shows 12.3 volts.going to the board so the board gets the right voltage.

Where is the clean water valve interlock switch ?

I brought the board to an electronics guy and all components on the board shows the right value according to him.

The transformer gets 110v at one side and 12 volts out . So transformer is working

Atleast the red power ok led shlould turn on or not ?
Thank you for replying
I have tested the bin control for continuity and all seems good .

My dmm shows 12.3 volts.going to the board so the board gets the right voltage.

Where is the clean water valve interlock switch ?

I brought the board to an electronics guy and all components on the board shows the right value according to him.

The transformer gets 110v at one side and 12 volts out . So transformer is working

Atleast the red power ok led shlould turn on or not ?

[fixbear]

Page 63 shows the valve handle. The notch engages the micro-switch.

Where are you measuring the 12 volts? Should be back of plug K2 pins 1 and 2 on the control board. Optionally you could measure it on the rectifier pins on the board just above the transformer plug. Black rectangular item. 2 pins on bottom are AC 12V. The 2 on top are 12V DC. If you have power there, the bin switch, power switch, high limit, and fuse are ok. If the voltage is too high, the MOV (M1 on the board if used) between the plug and rectifier bridge will clamp and prevent the board from powering.

You say that you replaced the control board. Have you verified the dip switch setting to be set for your model? If you have a mechanical bin switch versa a Temperature one, it has to be set different. Also, you have to check the APL switch to be set the same as your old board. Located between the X3 and X4 relays. Check for a white wire on the top of the K1 connector (pin 1). If none is there, set the switch to ALP.

It would be a help to me if I had the build date or model suffix number.

[fixbear]

Atleast the red power ok led shlould turn on or not ?Atleast the red power ok led shlould turn on or not ?

Yes, but the board dip switches have to be correct, and the voltage also has to be correct.

[Tropicalice]

I was measering the 12 volts on the pins of the k2 plug and measures 12.2 volts.

I also measured rectifier pins and one measures 12.2 volt ac and the other pins measures 16.14. dc volts.

Its not a new board, i removed the board and brought it to an electronic repair guy to check if he could find anything burned on the board but says all seems good so i put the board back in.

All the dip switches are on factory settings . This model has an mechanical bin switch .

20220814_144748-rotated-scaled.jpg 489 KB Image File - Click to view Copy Download Link 20220814_144712-rotated-scaled.jpg 583 KB Image File - Click to view Copy Download Link 20220814_145029-rotated-scaled.jpg 470 KB Image File - Click to view Copy Download Link

[Tropicalice]

I see ALP but its not a switch , looks like solder points. Please see image.

20220814_145829-rotated-scaled.jpg 398 KB Image File - Click to view Copy Download Link

[fixbear]

That’s a real early board. You can find a date on the compressor tag. I almost think it’s a F1 instead of a M1 or M2. The newer boards are Alpine’s and have the ALP switch. Mechanical bin switch is a variable resistance. The thermostat one is off and on. You have correct voltage to the board, have you tried the test system? If you confirm all the dip switches are in the correct place, then it looks like you’re going to need a board. When he had it on the bench, did the power light light?

[Tropicalice]

There is c1601 on the compressor tag.

The board number is 2A1410-01

Noting lights on when it was in the bench only that long beeb sound.