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Thread

Most front panel buttons don't work - Emax 1 Rack HD

2011-11-04 by mcnik_k

Hi all,

I managed to get an Emax, but unfortunately there is a fault. Most of the front panel buttons are not working, and the ones that do are not doing the correct function. From the numbers and arrows, only 7, 9, and 0 seem to work, and 7 and 9 seem to do the sideways arrows function sometimes. 

Machine can load discs, and can playback sequences, but the only 'Modules' switch that is working is 'preset management', and that brings up the 'master' menu!

LCD and sliders work OK.

I have checked panel board and looks ok, also all switches work ok and have tested lead to mainboard and all connections are ok.

Have read this could be the 'scanner MPU', but cannot see a chip called "6500/11" nor "IM-386 R1125" nor "6502 Rockwell". Does anyone know where this chip is located? In any case, I have heard this can't be replaced these days, but I'm thinking maybe it is another chip that has gone such as a CD74HCT273E CMOS Logic Octal D-Type Flip-Flop (not sure what these do, but they seem to look directly at the ribbon cable coming from the display).

Any help would be much appreciated. I am ok with a soldering iron and have multimeter + oscilloscope so can run any checks anyone thinks are appropriate. Failing that, if there is anyone in the UK that fixes these old birds, please let me know!

Thanks,

Nik

Re: [emax] Most front panel buttons don't work - Emax 1 Rack HD

2011-11-04 by jack

the cmos logic chips deal with the leds switching and all button presses

the scanner cpu is usually for keyboards is it a rack or keyboard

now i have spare mother boards what rev is yours

Show quoted textHide quoted text

  ----- Original Message ----- 
  From: mcnik_k 
  To: emax@yahoogroups.com 
  Sent: Friday, November 04, 2011 8:09 AM
  Subject: [emax] Most front panel buttons don't work - Emax 1 Rack HD

  Hi all,

  I managed to get an Emax, but unfortunately there is a fault. Most of the front panel buttons are not working, and the ones that do are not doing the correct function. From the numbers and arrows, only 7, 9, and 0 seem to work, and 7 and 9 seem to do the sideways arrows function sometimes. 

  Machine can load discs, and can playback sequences, but the only 'Modules' switch that is working is 'preset management', and that brings up the 'master' menu!

  LCD and sliders work OK.

  I have checked panel board and looks ok, also all switches work ok and have tested lead to mainboard and all connections are ok.

  Have read this could be the 'scanner MPU', but cannot see a chip called "6500/11" nor "IM-386 R1125" nor "6502 Rockwell". Does anyone know where this chip is located? In any case, I have heard this can't be replaced these days, but I'm thinking maybe it is another chip that has gone such as a CD74HCT273E CMOS Logic Octal D-Type Flip-Flop (not sure what these do, but they seem to look directly at the ribbon cable coming from the display).

  Any help would be much appreciated. I am ok with a soldering iron and have multimeter + oscilloscope so can run any checks anyone thinks are appropriate. Failing that, if there is anyone in the UK that fixes these old birds, please let me know!

  Thanks,

  Nik

[Non-text portions of this message have been removed]

Re: [emax] Most front panel buttons don't work - Emax 1 Rack HD

2011-11-04 by jack

i fix them in uk 

synth and sampler repair

01922442853

im fixing 1 at the moment i just did a full cap replacement added scsi and fitting pcb for slim floppy operation and i m fitting to day when it turns up an vfd display

also fixing 7 dp4 enso9niq fx processors

an s2turbo

korg t3 which is having a psu repaired and the 1mb zip chips fittedx10 for 512k sample memory

Show quoted textHide quoted text

--- Original Message ----- 
  From: mcnik_k 
  To: emax@yahoogroups.com 
  Sent: Friday, November 04, 2011 8:09 AM
  Subject: [emax] Most front panel buttons don't work - Emax 1 Rack HD

  Hi all,

  I managed to get an Emax, but unfortunately there is a fault. Most of the front panel buttons are not working, and the ones that do are not doing the correct function. From the numbers and arrows, only 7, 9, and 0 seem to work, and 7 and 9 seem to do the sideways arrows function sometimes. 

  Machine can load discs, and can playback sequences, but the only 'Modules' switch that is working is 'preset management', and that brings up the 'master' menu!

  LCD and sliders work OK.

  I have checked panel board and looks ok, also all switches work ok and have tested lead to mainboard and all connections are ok.

  Have read this could be the 'scanner MPU', but cannot see a chip called "6500/11" nor "IM-386 R1125" nor "6502 Rockwell". Does anyone know where this chip is located? In any case, I have heard this can't be replaced these days, but I'm thinking maybe it is another chip that has gone such as a CD74HCT273E CMOS Logic Octal D-Type Flip-Flop (not sure what these do, but they seem to look directly at the ribbon cable coming from the display).

  Any help would be much appreciated. I am ok with a soldering iron and have multimeter + oscilloscope so can run any checks anyone thinks are appropriate. Failing that, if there is anyone in the UK that fixes these old birds, please let me know!

  Thanks,

  Nik

[Non-text portions of this message have been removed]

Re: Most front panel buttons don't work - Emax 1 Rack HD

2011-11-04 by mcnik_k

Hi,

It is a rack.

Mobo EMAX CPU PCB PC333 BOARD REV A

Seems like it is possible to get the CMOS chips still http://parts.digikey.com/1/parts/515947-ic-octal-d-type-f-f-hs-20-dip-cd74hct273e.html

Will reply regarding your services off list.

Many thanks!



--- In emax@yahoogroups.com, "jack" <jammie.emma@...> wrote:

Show quoted textHide quoted text

>
> the cmos logic chips deal with the leds switching and all button presses
> 
> the scanner cpu is usually for keyboards is it a rack or keyboard
> 
> now i have spare mother boards what rev is yours
>   ----- Original Message ----- 
>   From: mcnik_k 
>   To: emax@yahoogroups.com 
>   Sent: Friday, November 04, 2011 8:09 AM
>   Subject: [emax] Most front panel buttons don't work - Emax 1 Rack HD
> 
> 
>     
>   Hi all,
> 
>   I managed to get an Emax, but unfortunately there is a fault. Most of the front panel buttons are not working, and the ones that do are not doing the correct function. From the numbers and arrows, only 7, 9, and 0 seem to work, and 7 and 9 seem to do the sideways arrows function sometimes. 
> 
>   Machine can load discs, and can playback sequences, but the only 'Modules' switch that is working is 'preset management', and that brings up the 'master' menu!
> 
>   LCD and sliders work OK.
> 
>   I have checked panel board and looks ok, also all switches work ok and have tested lead to mainboard and all connections are ok.
> 
>   Have read this could be the 'scanner MPU', but cannot see a chip called "6500/11" nor "IM-386 R1125" nor "6502 Rockwell". Does anyone know where this chip is located? In any case, I have heard this can't be replaced these days, but I'm thinking maybe it is another chip that has gone such as a CD74HCT273E CMOS Logic Octal D-Type Flip-Flop (not sure what these do, but they seem to look directly at the ribbon cable coming from the display).
> 
>   Any help would be much appreciated. I am ok with a soldering iron and have multimeter + oscilloscope so can run any checks anyone thinks are appropriate. Failing that, if there is anyone in the UK that fixes these old birds, please let me know!
> 
>   Thanks,
> 
>   Nik
> 
> 
> 
>   
> 
> [Non-text portions of this message have been removed]
>

Re: Most front panel buttons don't work - Emax 1 Rack HD

2011-11-05 by emax_dx5

Hello.
When The R1125 fails, usually all the key functions (Both keyboard and buttons/Sliders) stop working. This chip scans all traffic between interface and cpu. It could be damaged but mine (and some other cases I knew) were as described before.
Best..




--- In emax@yahoogroups.com, "mcnik_k" <nikkinloch@...> wrote:

Show quoted textHide quoted text

>
> Hi,
> 
> It is a rack.
> 
> Mobo EMAX CPU PCB PC333 BOARD REV A
> 
> Seems like it is possible to get the CMOS chips still http://parts.digikey.com/1/parts/515947-ic-octal-d-type-f-f-hs-20-dip-cd74hct273e.html
> 
> Will reply regarding your services off list.
> 
> Many thanks!

Re: Most front panel buttons don't work - Emax 1 Rack HD

2011-11-05 by mcnik_k

Thanks mate.

Just did a voltage check on the switches, interesting results.

There is no voltage at either side of any of the switches that are not working.

The only switches that have voltage, and therefore are working (albeit not correctly), are:

0, 9, 7
Off / No
Enter
Play
Record
Preset Management

This leads back to no power at Diodes 5 / 6 / 7, but diode 8 has power.

The schematic  (PDF service manual, page 48) shows these coming from IC12, which is a CD4028BE. This chip then goes to the Scanner CPU IC7, which is an IM368-1 BA / R1125-11.

I am not sure how to test from here on. I have the datasheet for CD4028BE, but I'm not 100% sure how to read it to confirm operation of this chip. However, I have made a guess and it seems the inputs to this chip are correct, so at a large guess I suspect this chip to have failed. I hope so anyway, because it is still available. I'm going to try to source one and swap it out.

Any further help, advice, prayers, raindances, or evocations appreciated!




--- In emax@yahoogroups.com, "emax_dx5" <cadena100rb@...> wrote:

Show quoted textHide quoted text

>
> Hello.
> When The R1125 fails, usually all the key functions (Both keyboard and buttons/Sliders) stop working. This chip scans all traffic between interface and cpu. It could be damaged but mine (and some other cases I knew) were as described before.
> Best..
> 
> 
> 
> 
> --- In emax@yahoogroups.com, "mcnik_k" <nikkinloch@> wrote:
> >
> > Hi,
> > 
> > It is a rack.
> > 
> > Mobo EMAX CPU PCB PC333 BOARD REV A
> > 
> > Seems like it is possible to get the CMOS chips still http://parts.digikey.com/1/parts/515947-ic-octal-d-type-f-f-hs-20-dip-cd74hct273e.html
> > 
> > Will reply regarding your services off list.
> > 
> > Many thanks!
>

RE: [emax] Re: Most front panel buttons don't work - Emax 1 Rack HD

2011-11-05 by el macaco

Did you check continuity on the traces carrying the power to the switches etc?

To: emax@yahoogroups.com

Show quoted textHide quoted text

From: nikkinloch@...
Date: Sat, 5 Nov 2011 12:36:07 +0000
Subject: [emax] Re: Most front panel buttons don't work - Emax 1 Rack HD

      Thanks mate.

Just did a voltage check on the switches, interesting results.

There is no voltage at either side of any of the switches that are not working.

The only switches that have voltage, and therefore are working (albeit not correctly), are:

0, 9, 7

Off / No

Enter

Play

Record

Preset Management

This leads back to no power at Diodes 5 / 6 / 7, but diode 8 has power.

The schematic  (PDF service manual, page 48) shows these coming from IC12, which is a CD4028BE. This chip then goes to the Scanner CPU IC7, which is an IM368-1 BA / R1125-11.

I am not sure how to test from here on. I have the datasheet for CD4028BE, but I'm not 100% sure how to read it to confirm operation of this chip. However, I have made a guess and it seems the inputs to this chip are correct, so at a large guess I suspect this chip to have failed. I hope so anyway, because it is still available. I'm going to try to source one and swap it out.

Any further help, advice, prayers, raindances, or evocations appreciated!

--- In emax@...m, "emax_dx5" <cadena100rb@...> wrote:

>

> Hello.

> When The R1125 fails, usually all the key functions (Both keyboard and buttons/Sliders) stop working. This chip scans all traffic between interface and cpu. It could be damaged but mine (and some other cases I knew) were as described before.

> Best..

> 

> 

> 

> 

> --- In emax@yahoogroups.com, "mcnik_k" <nikkinloch@> wrote:

> >

> > Hi,

> > 

> > It is a rack.

> > 

> > Mobo EMAX CPU PCB PC333 BOARD REV A

> > 

> > Seems like it is possible to get the CMOS chips still http://parts.digikey.com/1/parts/515947-ic-octal-d-type-f-f-hs-20-dip-cd74hct273e.html

> > 

> > Will reply regarding your services off list.

> > 

> > Many thanks!

>

[Non-text portions of this message have been removed]

Re: Most front panel buttons don't work - Emax 1 Rack HD

2011-11-05 by mcnik_k

Yes, continuity checked for all voltage supply lines to switches.

Fault is definitely pre-diode on the main digital board. All 4 diodes should have +5 at their chip-facing side, three of them have near zero, only one has +5, that is the one that supplies the aforementioned working switches.

Thanks!


--- In emax@yahoogroups.com, el macaco <elmacaco@...> wrote:

Show quoted textHide quoted text

>
> Did you check continuity on the traces carrying the power to the switches etc?
>

Re: [emax] Re: Most front panel buttons don't work - Emax 1 Rack HD

2011-11-05 by jack

ill check on sunday as im doing some burn in tests for a vfd so i can check the signals with a logic anyliser and check the voltages for the diodes could have a cold joint some where 

il;l let you know tomorrow what i find

Show quoted textHide quoted text

  ----- Original Message ----- 
  From: mcnik_k 
  To: emax@yahoogroups.com 
  Sent: Saturday, November 05, 2011 4:28 PM
  Subject: [emax] Re: Most front panel buttons don't work - Emax 1 Rack HD

  Yes, continuity checked for all voltage supply lines to switches.

  Fault is definitely pre-diode on the main digital board. All 4 diodes should have +5 at their chip-facing side, three of them have near zero, only one has +5, that is the one that supplies the aforementioned working switches.

  Thanks!

  --- In emax@yahoogroups.com, el macaco <elmacaco@...> wrote:
  >
  > Did you check continuity on the traces carrying the power to the switches etc?
  >

[Non-text portions of this message have been removed]

Re: Most front panel buttons don't work - Emax 1 Rack HD

2011-11-05 by mcnik_k

Thanks Jack, I took out the digi board and ran an iron over the CD4028 and the Scanner chip connections, fault is still there. Also removed and reseated scanner chip, fault still there.

I reckon it is an internal fault on the scanner chip or the CD4028. I'm looking for +5 at the connections 2, 3, 14, 15 on the CD4028. The inputs from the scanner chip I think are 10 and 13, was getting the same 'low' reading on both of them when I checked.

Any more info would be great. Can get a  CD4028 at Farnell, but £20 minimum spend so want to know that'll fix it.




--- In emax@yahoogroups.com, "jack" <jammie.emma@...> wrote:

Show quoted textHide quoted text

>
> ill check on sunday as im doing some burn in tests for a vfd so i can check the signals with a logic anyliser and check the voltages for the diodes could have a cold joint some where 
> 
> il;l let you know tomorrow what i find
>   ----- Original Message ----- 
>   From: mcnik_k 
>   To: emax@yahoogroups.com 
>   Sent: Saturday, November 05, 2011 4:28 PM
>   Subject: [emax] Re: Most front panel buttons don't work - Emax 1 Rack HD
> 
> 
>     
>   Yes, continuity checked for all voltage supply lines to switches.
> 
>   Fault is definitely pre-diode on the main digital board. All 4 diodes should have +5 at their chip-facing side, three of them have near zero, only one has +5, that is the one that supplies the aforementioned working switches.
> 
>   Thanks!
> 
>   --- In emax@yahoogroups.com, el macaco <elmacaco@> wrote:
>   >
>   > Did you check continuity on the traces carrying the power to the switches etc?
>   >
> 
> 
> 
>   
> 
> [Non-text portions of this message have been removed]
>

Re: Most front panel buttons don't work - Emax 1 Rack HD

2011-11-09 by mcnik_k

Ok, well I have replaced both CD4028 chips (IC11, IC12), but no difference, same fault.

Looks like the scanner chip *is* partially faulty?

Also, the 'Preset Management' LED is lit during startup, apparently this means the scanner chip isn't present?

Anyone got any last ideas?

Thanks!

Re: [emax] Re: Most front panel buttons don't work - Emax 1 Rack HD

2011-11-09 by jack

that chip is a programed pal chip by emu unless you can get emu to give you the bin file for it so you could burn your own you will be out of luck unless you scavange 1 from another board which will make that board useless

Show quoted textHide quoted text

  ----- Original Message ----- 
  From: mcnik_k 
  To: emax@yahoogroups.com 
  Sent: Wednesday, November 09, 2011 1:36 PM
  Subject: [emax] Re: Most front panel buttons don't work - Emax 1 Rack HD

  Ok, well I have replaced both CD4028 chips (IC11, IC12), but no difference, same fault.

  Looks like the scanner chip *is* partially faulty?

  Also, the 'Preset Management' LED is lit during startup, apparently this means the scanner chip isn't present?

  Anyone got any last ideas?

  Thanks!

  No virus found in this message.
  Checked by AVG - www.avg.com
  Version: 2012.0.1869 / Virus Database: 2092/4605 - Release Date: 11/08/11

[Non-text portions of this message have been removed]

Re: [emax] Re: Most front panel buttons don't work - Emax 1 Rack HD

2011-11-09 by jack

ted have you had any luck in reading pal chips as i know thats the reason why the memory upgrades for the emax2 is due not being able to get the pal chips

do you know any body been able to create new ones

Show quoted textHide quoted text

  ----- Original Message ----- 
  From: jack 
  To: emax@yahoogroups.com 
  Sent: Wednesday, November 09, 2011 3:20 PM
  Subject: Re: [emax] Re: Most front panel buttons don't work - Emax 1 Rack HD

  that chip is a programed pal chip by emu unless you can get emu to give you the bin file for it so you could burn your own you will be out of luck unless you scavange 1 from another board which will make that board useless 
  ----- Original Message ----- 
  From: mcnik_k 
  To: emax@yahoogroups.com 
  Sent: Wednesday, November 09, 2011 1:36 PM
  Subject: [emax] Re: Most front panel buttons don't work - Emax 1 Rack HD

  Ok, well I have replaced both CD4028 chips (IC11, IC12), but no difference, same fault.

  Looks like the scanner chip *is* partially faulty?

  Also, the 'Preset Management' LED is lit during startup, apparently this means the scanner chip isn't present?

  Anyone got any last ideas?

  Thanks!

  No virus found in this message.
  Checked by AVG - www.avg.com
  Version: 2012.0.1869 / Virus Database: 2092/4605 - Release Date: 11/08/11

  [Non-text portions of this message have been removed]

  No virus found in this message.
  Checked by AVG - www.avg.com
  Version: 2012.0.1869 / Virus Database: 2092/4605 - Release Date: 11/08/11

[Non-text portions of this message have been removed]

Re: [emax] Re: Most front panel buttons don't work - Emax 1 Rack HD

2011-11-09 by Ted Summers

You can get the scanner here:
http://www.eprelectronics.com/store/E-mu-Keyboards-PARTS/E-mu-Emax/IC-MOS-R6500-11-Microcomputer-1-chip-p72.html


On Wed, Nov 9, 2011 at 5:36 AM, mcnik_k <nikkinloch@...> wrote:

> **
>
>
> Ok, well I have replaced both CD4028 chips (IC11, IC12), but no
> difference, same fault.
>
> Looks like the scanner chip *is* partially faulty?
>
> Also, the 'Preset Management' LED is lit during startup, apparently this
> means the scanner chip isn't present?
>
> Anyone got any last ideas?
>
> Thanks!
>
>  
>


[Non-text portions of this message have been removed]

Re: [emax] Re: Most front panel buttons don't work - Emax 1 Rack HD

2011-11-09 by jack

thanks ted epr then


----- Original Message -----

Show quoted textHide quoted text

From: "Ted Summers" <djtbs1@...>
To: <emax@yahoogroups.com>
Sent: Wednesday, November 09, 2011 4:22 PM
Subject: Re: [emax] Re: Most front panel buttons don't work - Emax 1 Rack HD


> You can get the scanner here:
> http://www.eprelectronics.com/store/E-mu-Keyboards-PARTS/E-mu-Emax/IC-MOS-R6500-11-Microcomputer-1-chip-p72.html
>
>
> On Wed, Nov 9, 2011 at 5:36 AM, mcnik_k <nikkinloch@...> wrote:
>
>> **
>>
>>
>> Ok, well I have replaced both CD4028 chips (IC11, IC12), but no
>> difference, same fault.
>>
>> Looks like the scanner chip *is* partially faulty?
>>
>> Also, the 'Preset Management' LED is lit during startup, apparently this
>> means the scanner chip isn't present?
>>
>> Anyone got any last ideas?
>>
>> Thanks!
>>
>>
>>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Emax and Emax II User's Group Website
>
> http://www.silveriafamily.comYahoo! Groups Links
>
>
>
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 2012.0.1869 / Virus Database: 2092/4605 - Release Date: 11/08/11
>

Re: Most front panel buttons don't work - Emax 1 Rack HD

2011-11-10 by mcnik_k

Wow, thanks! I didn't think those chips were still available, amazing!

One fly in the ointment is shipping to UK is $38.95 on top of $56.02 for the chip = $94.97. I have emailed them as I think posting one chip should be less money!

Also, can anyone help me confirm my chip is at fault? Any readings from a working chip would be much appreciated, just to be sure it is not an ancillary component that is pulling those 3 lines low.

Thanks!



--- In emax@yahoogroups.com, Ted Summers <djtbs1@...> wrote:

Show quoted textHide quoted text

>
> You can get the scanner here:
> http://www.eprelectronics.com/store/E-mu-Keyboards-PARTS/E-mu-Emax/IC-MOS-R6500-11-Microcomputer-1-chip-p72.html
> 
> 
> On Wed, Nov 9, 2011 at 5:36 AM, mcnik_k <nikkinloch@...> wrote:
> 
> > **
> >
> >
> > Ok, well I have replaced both CD4028 chips (IC11, IC12), but no
> > difference, same fault.
> >
> > Looks like the scanner chip *is* partially faulty?
> >
> > Also, the 'Preset Management' LED is lit during startup, apparently this
> > means the scanner chip isn't present?
> >
> > Anyone got any last ideas?
> >
> > Thanks!
> >
> >  
> >
> 
> 
> [Non-text portions of this message have been removed]
>

Re: [emax] Re: Most front panel buttons don't work - Emax 1 Rack HD

2011-11-10 by jack

i have some spare broken boards so could desolder the chip for vyou for a lesser cost

Show quoted textHide quoted text

  ----- Original Message ----- 
  From: mcnik_k 
  To: emax@yahoogroups.com 
  Sent: Thursday, November 10, 2011 6:52 PM
  Subject: [emax] Re: Most front panel buttons don't work - Emax 1 Rack HD

  Wow, thanks! I didn't think those chips were still available, amazing!

  One fly in the ointment is shipping to UK is $38.95 on top of $56.02 for the chip = $94.97. I have emailed them as I think posting one chip should be less money!

  Also, can anyone help me confirm my chip is at fault? Any readings from a working chip would be much appreciated, just to be sure it is not an ancillary component that is pulling those 3 lines low.

  Thanks!

  --- In emax@yahoogroups.com, Ted Summers <djtbs1@...> wrote:
  >
  > You can get the scanner here:
  > http://www.eprelectronics.com/store/E-mu-Keyboards-PARTS/E-mu-Emax/IC-MOS-R6500-11-Microcomputer-1-chip-p72.html
  > 
  > 
  > On Wed, Nov 9, 2011 at 5:36 AM, mcnik_k <nikkinloch@...> wrote:
  > 
  > > **
  > >
  > >
  > > Ok, well I have replaced both CD4028 chips (IC11, IC12), but no
  > > difference, same fault.
  > >
  > > Looks like the scanner chip *is* partially faulty?
  > >
  > > Also, the 'Preset Management' LED is lit during startup, apparently this
  > > means the scanner chip isn't present?
  > >
  > > Anyone got any last ideas?
  > >
  > > Thanks!
  > >
  > > 
  > >
  > 
  > 
  > [Non-text portions of this message have been removed]
  >

  No virus found in this message.
  Checked by AVG - www.avg.com
  Version: 2012.0.1869 / Virus Database: 2092/4608 - Release Date: 11/10/11

[Non-text portions of this message have been removed]

Re: Most front panel buttons don't work - Emax 1 Rack HD

2011-11-28 by cheju_99

anybody had success dealing with this reparation and this kind of supply?....

--- In emax@yahoogroups.com, Ted Summers <djtbs1@...> wrote:

Show quoted textHide quoted text

>
> You can get the scanner here:
> http://www.eprelectronics.com/store/E-mu-Keyboards-PARTS/E-mu-Emax/IC-MOS-R6500-11-Microcomputer-1-chip-p72.html
> 
> 
> On Wed, Nov 9, 2011 at 5:36 AM, mcnik_k <nikkinloch@...> wrote:
> 
> > **
> >
> >
> > Ok, well I have replaced both CD4028 chips (IC11, IC12), but no
> > difference, same fault.
> >
> > Looks like the scanner chip *is* partially faulty?
> >
> > Also, the 'Preset Management' LED is lit during startup, apparently this
> > means the scanner chip isn't present?
> >
> > Anyone got any last ideas?
> >
> > Thanks!
> >
> >  
> >
> 
> 
> [Non-text portions of this message have been removed]
>

Re: [emax] Re: Most front panel buttons don't work - Emax 1 Rack HD

2011-11-29 by jammie

when i did niks i changed the scanner cpu but it stilldid not work

so i put his scanner cpu in a working mother board and the scanner cpu was fine

other than that i have not diagnosed the problimatic board as it takes lots of time doing logic testing which costs lots of money

i did nik a replacement board with his scsihardware and firmware

Show quoted textHide quoted text

  ----- Original Message ----- 
  From: cheju_99 
  To: emax@yahoogroups.com 
  Sent: Monday, November 28, 2011 10:19 PM
  Subject: [emax] Re: Most front panel buttons don't work - Emax 1 Rack HD


    
  anybody had success dealing with this reparation and this kind of supply?....

  --- In emax@yahoogroups.com, Ted Summers <djtbs1@...> wrote:
  >
  > You can get the scanner here:
  > http://www.eprelectronics.com/store/E-mu-Keyboards-PARTS/E-mu-Emax/IC-MOS-R6500-11-Microcomputer-1-chip-p72.html
  > 
  > 
  > On Wed, Nov 9, 2011 at 5:36 AM, mcnik_k <nikkinloch@...> wrote:
  > 
  > > **
  > >
  > >
  > > Ok, well I have replaced both CD4028 chips (IC11, IC12), but no
  > > difference, same fault.
  > >
  > > Looks like the scanner chip *is* partially faulty?
  > >
  > > Also, the 'Preset Management' LED is lit during startup, apparently this
  > > means the scanner chip isn't present?
  > >
  > > Anyone got any last ideas?
  > >
  > > Thanks!
  > >
  > > 
  > >
  > 
  > 
  > [Non-text portions of this message have been removed]
  >



  

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