Bally 3 reel E1235 MPU dead !!

[easternpinman]

Hi   to  all  E1000   series Masters ,,,,,

I try resurrect this machine CPU is dead 2650 chip is OK tested in a 4 reel 2000 series I have only clock signal and if I reset direct on  2650 chip to pin 16 a data signal show up but then disappear

I suspect also a bad SN chip consumption is 0.82 A  and the power supply IC is too hot  all the socket-ed  chips were removed + the RAM board +2560  and still have  0.82 A surge

Can I  work at the MPU board on the bench  with 5 Vcc  supply only  ?  to make it boot ? are the small 82S proms essential to boot ?
Do I mess up the E 2000  if I test the 5101 RAM  from E1235  on it  ?  to request a new  initialization or  a  reset chip ?

One more thing the 5 lamps on the 3 reel  index boards are lighted normal should light only when a  coin is inserted !  the boards were checked and repaired i know the drill from the other  E 2000  I have

[dhellis]

The MPU board has other signals that are needed so testing on the bench with just a 5v supply may be
ok to run down some things you will likely not get it to a boot stage.

Pin 16 of the 2650 is the reset line, so you would expect to see the signal come and go high during
the reset and then go low after the reset has completed

The 3 82S123 bipolar proms are required, U21 is used to decode interrupt signals, U25 is an address
decoder for the EPROMS and U29 decodes control signals.

It is not unusual to find the regulators hot, the one closest to the edge will likely be much cooler than
the one below it.

I have never measured the current draw so can't really tell you if 0.8 amps is to high or not

[easternpinman]

Hi Dan

Thanks for replay so an easy and quick way  to work on the bench  is to extend the power connector ?
 I realized  that  I need  a zero cross input too ,,,

[dhellis]

That would be the easiest way, then you have all of the signals available.

[jancsi]

0, 82 Amper  is good.
When I repair my E-1000 CPU with  laboratory Power Supply, it showed about 0,9 Amper  with 6 digit display.
2 7805 was hot, but it's normal.
5 V power supply not enough to test  CPU Board.
It need 60Hz zero crossing signal too which make interrupt signals.
I make zero crossing circuit  (on the table) from a small 6V transformator and diode graetz.

[dhellis]

Jancsi is correct, 5 volts is not enough to test the MPU board. I had overlooked the regulators in my response.
Those regulators need a minimum of 7.5 volts input before they can give you the regulated 5 volts.

While in the machine, this voltage comes from the power supplies UR (UnRegulated) voltage.

[jancsi]

It's my simple E-1000 Board table test rig from old PC power supply connector and one small transformator with  diode bridge to zero crossing signal.

[easternpinman]

OK Jancsi

I will try  your layout  maybe you can PM me about how to source the proms
thanks

Marius

[jancsi]

It's working layout. I repair my CPU with this.

Zero crossing signal need to J1 1 and 2 pin
J1 14 , 15  >7,5V  (+10V)
J1 12 , 13 GND and zero crossing bridge - point.

[jancsi]

Prom U21 in E-1000 board   same as E-2000 board U8 prom  , you can swap it to try.
Have you any error code on red digital display?

[easternpinman]

Hi All and especial dhellis,,,,,,,,,,


I have made some more digging a transistor  on the reset line was burned and U5 74LS132  also now when machine starts I have 0 at the right side of the red display  and after 5 seconds a 3 on right side which according to bally is M3  fault  ,   if I remove M3   starts with 0 to the right    and then a 3 to the left

I have read the M3 with my eprom programer seems OK - as not blank or y  all the way  it reads a  COPR Bally 1982  somewhere  but of course I have nothing to compare with ,,,,,,,,,,,,,,,,,this M3  is tied with the  U25 PROM  ,,,,,,,,,,,,,,,,,,,,,so I need an advise form You Dan,,,,, please !!!!!!

[dhellis]

U25 is the address decoder so it is tied to all of the eprom.

There are several versions of the M3 eproms but each one has a checksum that ends with 00

If you have the number from your M3, I can look to see if I have that file and let you know
what the checksum is.

U5 is used in the clocked interrupts circuit (pins 4, 5 and 6) and also used in the reset circuitry
(pins 11,12,13) along with U26 (Pins 3 and 4)

The clocked interrupt is also controlled by U19 (pins 2, 11 and 15) as well as U20 (pins 4,5,6 and 13)

[easternpinman]

Hello Dan

thanks for   Your quick reply I have sent you an email to i----@coin----.com

[easternpinman]

Hi all

FIRST A BIG THANK  TO ,,,,,,dhellis ,,,,,,,,,,,DAN without his support could not advance this  e series   TS   

Dan has checked  the eprom files and turn to be good especially M3  on which I had  the error  I have swapped  the 5101 RAM and change one   with another chip  ( there are  2 RAM 5101  on the board )and machine started to go take coin could go in test menu play but no payout when coin door was open after a non payout win the code was 71000   I suspect reel one opto ,,,,,,,,,,,,,changed with another unit than swapped with unit  from reel 2  ,,,same  thing  71000,,,,,Dan answered that in fact 71000  is only coin door open 
   Put the unit in reel test but was no change when I was spinning the discs into the red display
  So I suspected something on the little board with 3 Ics on the reel frame underneath  put in test reel and measured signals ,,,and it seem after the first chip 7404 the signals were to low  I changed this chip and everything has changed now in test was some move on the red display in reels test .

  Machine starts running and payout was working !!

So conclusion E 2000  series when an opto is not working you get an error on display to E1000  software is poor as older design and there is no error message  just no payout and no move in reel test !!!!

I have had another 3 hours loop of head ache  because one  connector on the backdoor was week and machines TILT every time after start up ,,, so verify connectors on the back door in case of TILT !!!


THANKS  NLG OF BEING ONLINE !!!!!

[dhellis]

Good to hear, but I will add one more bit of information, the IC that you called a 7404 should be
a 74C14 which is a Hex Schmitt Trigger, the 7404 is is a Hex Inverter. Functionally they will test
the same but the 74C14 has hysteresis which aids in noise rejection

If you have a 74C14, I would replace it, if no 74C14 then use a CD40106

[easternpinman]

yes correction it was  U1    a 7417 and I put 74LS07   which has higher voltage 

[dhellis]

yes correction it was  U1    a 7417 and I put 74LS07   which has higher voltage

OK, solves that and I agree with using the 74LS07