KM3P,There are 2 U75 EPROMS, No U76

[kc8jyr]

Hello
My KM3P ill will not give me a start text screen. I was reading bloke's many replys and found I have 2 U75 EPROMS and no U76 on the memory board. U65 through U74 look new and are HURCO 8.60. U75s (times 2) are KM3 V8.60. There is no U76. I would think I need the U75 EPROM.
Thank you

[bloke]

U75 and U76 are where the options and language are stored. If the machine is new to you, it sounds like whoever had it last wanted the options out of it but made a boo-boo swapping the EPROMs. If that's the case, there's probably another machine out there as well that's not doing a lot at the minute...

Did you get it from a dealer?

[kc8jyr]

No, it came from a mold shop, then high school, then a friend (?), then me. Seem like good iron. Not sure of the control yet.

With the help of many past posts and replies, I got the text CRT down to one blinking cursor in the bottom left corner. No start up screen yet. Looks like I need to find a U76 EPROM. Maybe someone has or can burn one for me. If someone has the code I can burn it.

The serial card, for the 2 ports on the back of the machine, had 2 MC1489s on it . Not sure if that is right. Just pulled the little card off for now.

Not sure about the magnetic door interlock. Does it just push the "bolt" out so you can not get in the control side of the machine while it is powered up? Someone had put black tape on the bolt so it could not come out and lock but I don"t think it is part of the control circuit. Is it just an electromagnetic?

Thank you to all
kc8jyr

[bloke]

If you have an EPROM programmer, can you find out the checksum for the two EPROMs you have? It'll help to identify what the options were on there. The FP code for an Intel 27512 is 4BA4 and for an Intel 27C512 is 5EA4.

[kc8jyr]

bloke,
I recorded the number on the EPROMs and see that the chip in U75 plug has a small 1175 on the bottom of the sticker. Like wise the chip in U76 plug has a small 1176 on the bottom of the sticker. I am not sure if the larger 002-3434-075 on each chip indicates it is a U75 EPROM or the smaller number is correct. Dang, just had a brain fart. The small numbers are at the bottom of the 2 tags. Could the 11xx be Uxx?
If so I am back to changing out the MC1488 and MC1489 on the CPU board. The iron has been hot. Already did the CRT board up at the key board. Better put DIP plugs in for easy changing.

U76
KM3 V8.60
002-3434-075
99C86C ENG/S
1176 07/22/92

U75
KM3 V8.60
002-3434-075
99BB31 ENG/S
1175 07/22/92

U74
002-3434-009 CS 09A9
HURCO 8.60-U74

U73
002-3434-009 CS C054
HURCO 8.60-U73

U72
002-3434-009 CS 40E7
HURCO 8.60-U72

U71
002-3434-009 CS 4A10
HURCO 8.60-U71

U70
002-3434-009 CS C470
HURCO 8.60-U70

U69
002-3434-009 CS B887
HURCO 8.60-U69

U68
002-3434-009 CS 8FFE
HURCO 8.60-U68

U67
002-3434-009 CS 5998
HURCO 8.60-U67

U66
002-3434-009 CS 904E
HURCO 8.60-U66

U65
002-3434-009 CS 704C
HURCO 8.60-U65

Thank you
kc8jyr

[bloke]

Looking at what you have there, the EPROMs are ok. It's more likely you have an issuee with the CPU or the CRT controller. The chances are, if you replace the 1488 and 1489 chips on both, you'll sort this.

[kc8jyr]

I did the Dallas SRAM replacement/Li batteries. Cut the small jumper wire. It had the 6 top jumpers on already ( 98 through 103 ?). Ran it and got the one blinking cursor video and 1 right side (MEM board) green LED on.

I then removed the 6 top jumpers and tried it again. Still got the one blinking cursor video with the 1 right side (MEM board) green LED on BUT the far left red LED (MEM board) came on. It is always on now. Is this bad?

Changed out both MC1488 and both MC1489s. Low voltage power supply gives the correct voltages per a past thread/post info.

Had a mouse issue on the CRT board. I need to rework it.
Any advice on the red LED might help.
Thank you for your help
kc8jyr

[kc8jyr]

I think I am moving forward.

No config screen yet.

The red LED on the MEM board is off.

Found a broken pin on a removable EPROM on the CRT board. Soldered that and moved on.

The K7 REV and K4 ATC/BCR relays closed on only during one start cycle and only while the power on (far right button) was pressed.

Now when I press the keys (soft and not) there are letters, numbers, and characters that are at the top of the text screen. They form a line to the end and return to the left to start a new line below the one above.

Tried the enter 999 enter, 100, 642, 639, 102, 101, 103, and on. Give me more and I will try them.

Maybe I am not moving forward.

Any advice may help
Thank you
Kc8jyr

[fasto]

Sounds like you're running the keyboard test mode of the operator console. Check that switch #8 on the CRT controller card is ON to go back to regular mode.

Also you said there are two 1489 chips on one board. One is definitely supposed to be a 1488. If you explain exactly which board I will look on my machine tomorrow and find out which is supposed to be which. If this is wrong the text screen will never work.
Do you have a graphics screen and does it ever show anything? It should draw a neat Ultimax logo without your touching anything at all.

[kc8jyr]

fasto,

Thank you for your reply.

I turned ON switch #8 on the CRT board and now there is only the blinking cursor in the bottom left corner. All the rest of the CRT switches are in the OFF position.

Can you tell me the correct position and what each of the switches #1 through # 7 do?

The 2 MC1489s are on a small daughter on the upper left corner of the CPU board. I think it goes to the 2 round RS232 ports on the back of the mill. There are a number of ways the chips can fit into the board. I mean there are a number of rows of 0.1” female connectors. I am not sure which rows of connectors the 2 chips go into.

Thank you again
kc8jyr

[bloke]

I'll stick a picture of an RS232 board on here when I'm next in the office. Probably friday or maybe tomorrow morning.

[kc8jyr]

Question please:
When the CRT board switch #8 (key board check) is in the off position, to check the key board, does the key press data pass through the CPU board and then back to the CRT board and on to the text monitor?

I want to know if the CPU board is used in checking the key board with switch #8 on the CRT board. This will help tell me if my GRAPHICS board (daughter board on CPU board) is being used and is OK.

If switch #8 only uses the CRT board, this will not help me.

There is still no config/start up screen. The graphics screen does not show anything. There is just a slight glow. The video card has a leaking cap.

I can bring the servos online by holding relays K1 and K5? closed. Other than that not much happens other than the fans and green LEDs that are on.

Thank you
kc8jyr