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Thread
2009-07-08 by Alden Jenks
Hello, I have a blown power supply on an Emax II. Now I can't determine what voltages are assigned to the wires that lead into the guts of the machine: there's a Violet, an Orange, a Green, and a Yellow. It seems clear that Green is Frame Ground. The others I can only guess. Does anybody know what the proper voltages would be? THANKS!!!! Alden Jenks [Non-text portions of this message have been removed]
2009-07-08 by s*
I think this should explain it: http://www.frtg.de/privat/emax/emax.htm I just replaced my Emax II with a PC ATX power supply and it's working great! -s* On Tue, Jul 7, 2009 at 10:48 PM, Alden Jenks <jendoafj@...> wrote: > > > Hello, > I have a blown power supply on an Emax II. Now I can't determine what > voltages are assigned to the wires that lead into the guts of the machine: > there's a Violet, an Orange, a Green, and a Yellow. It seems clear that > Green is Frame Ground. The others I can only guess. Does anybody know what > the proper voltages would be? THANKS!!!! > > Alden Jenks > > [Non-text portions of this message have been removed] > > > [Non-text portions of this message have been removed]
2009-07-08 by jammie
purple is -12v dc orange is 12vdc green is common or ground ov yellow is 5v dc
----- Original Message ----- From: Alden Jenks To: emax@yahoogroups.com Sent: Wednesday, July 08, 2009 3:48 AM Subject: [emax] Emax II Power Supply Hello, I have a blown power supply on an Emax II. Now I can't determine what voltages are assigned to the wires that lead into the guts of the machine: there's a Violet, an Orange, a Green, and a Yellow. It seems clear that Green is Frame Ground. The others I can only guess. Does anybody know what the proper voltages would be? THANKS!!!! Alden Jenks [Non-text portions of this message have been removed] ------------------------------------------------------------------------------ No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.386 / Virus Database: 270.13.5/2220 - Release Date: 07/05/09 17:54:00 [Non-text portions of this message have been removed]
2009-07-09 by Donavan
Hi guys,
My Emax hasn't been function again lately. I saw a posting by Jimmy Moore with a link to a german site about using an AT PSU. The description of the LCD corrupting and LED blinking is what struck me. My LCD goes blank, sometimes with some corrupt text visible, there is a whine that is comeing from the area of the keyboard by the LCD, and also all the LEDs light up and a CRC message can appear though this happens inconsistently.
My question is what is the acceptable voltage variance? The diagnostics document I have say the VR1 can have +/- 5% variance, so on the required +5VDC a range of 4.75-5.25 is with in specs.
Also, someone mentioned that the LCD (emulator_island?) that the LCD can make this whine, but to your knowledge will this cause the other problems?
Thanks
Emax Specs
Verify +12V on orange wire.
Verify +SV on yellow wire.
Verify -l2V on purple wire.
Verify + 10V on pin 3 of Q2.
My Test Results20DCV meter setting
At psu connector at board connector
orange 11.94V 11.94V
purp -11.9V -11.9V
yellow 4.96V 4.94V
Floppy
orange 11.94 Yellow 4.94
200m meter setting
Floppy
green - 41 blue/Purp/Wht - 5.1
Q2 visible circuit path pin
1 - 10.04
2-11.93
3-10.72
[Non-text portions of this message have been removed]2009-07-09 by Ted Summers
My emax rack did this and it turned out to be a bad connection to the power supply on the AC connector. Regards, Ted On Jul 9, 2009, at 12:17 AM, Donavan wrote: Hi guys, My Emax hasn't been function again lately. I saw a posting by Jimmy Moore with a link to a german site about using an AT PSU. The description of the LCD corrupting and LED blinking is what struck me. My LCD goes blank, sometimes with some corrupt text visible, there is a whine that is comeing from the area of the keyboard by the LCD, and also all the LEDs light up and a CRC message can appear though this happens inconsistently. My question is what is the acceptable voltage variance? The diagnostics document I have say the VR1 can have +/- 5% variance, so on the required +5VDC a range of 4.75-5.25 is with in specs. Also, someone mentioned that the LCD (emulator_island?) that the LCD can make this whine, but to your knowledge will this cause the other problems? Thanks Emax Specs Verify +12V on orange wire. Verify +SV on yellow wire. Verify -l2V on purple wire. Verify + 10V on pin 3 of Q2. My Test Results20DCV meter setting At psu connector at board connector orange 11.94V 11.94V purp -11.9V -11.9V yellow 4.96V 4.94V Floppy orange 11.94 Yellow 4.94 200m meter setting Floppy green - 41 blue/Purp/Wht - 5.1 Q2 visible circuit path pin 1 - 10.04 2-11.93 3-10.72 [Non-text portions of this message have been removed] [Non-text portions of this message have been removed]
2009-07-10 by Donavan
Hi Ted, Are you referring to the three pins coming form the AC receptacle: the green to the ground screw, and the blue and brown that go to the Toroid->power switch->AC IN? Do you recall where the problem was in the chain I described above? Do you have any insight into the voltage variance? Initially +11.9 seems "close enough", but I know there are some components that draw 0.02 and that missing 0.1 could be enough to cause a cascading problem. Also, just testing it now I had head phones plugged into Left Out and as soon as I unplugged the head phones the LCD went out with some residual corruption. I turned the Emax off and back on and the screen was fine. I tried this test two more times and I started to get the whine from the LCD screen (or a component right next to it). Now the forth time I turn it on the screen is off/corrupt from the start, the whine is still there but the disk loads and I still get audio. The fifth time I turn it off and back on the screen is just off completely, the whine is there (gets louder the long the unit is on), the floppy won't load completely and all the LEDs except the one at Record/Preset Management, Dynamic Allocation, Load All and Enter are on, and I get no audio of course. My assumption is that the voltage variance is causing this negative effect depending on certain variables, such as heat given that atoms can move around and the atoms can also hold more electrons, disrupting the flow of electrons through the conductor. Thanks for the help Patrick ________________________________
From: Ted Summers <djtbs1@...>
To: emax@yahoogroups.com
Sent: Thursday, July 9, 2009 6:22:08 AM
Subject: Re: [emax] Power Supply Voltage Question
My emax rack did this and it turned out to be a bad connection to the
power supply on the AC connector.
Regards,
Ted
On Jul 9, 2009, at 12:17 AM, Donavan wrote:
Hi guys,
My Emax hasn't been function again lately. I saw a posting by Jimmy
Moore with a link to a german site about using an AT PSU. The
description of the LCD corrupting and LED blinking is what struck me.
My LCD goes blank, sometimes with some corrupt text visible, there is
a whine that is comeing from the area of the keyboard by the LCD, and
also all the LEDs light up and a CRC message can appear though this
happens inconsistently.
My question is what is the acceptable voltage variance? The
diagnostics document I have say the VR1 can have +/- 5% variance, so
on the required +5VDC a range of 4.75-5.25 is with in specs.
Also, someone mentioned that the LCD (emulator_island? ) that the LCD
can make this whine, but to your knowledge will this cause the other
problems?
Thanks
Emax Specs
Verify +12V on orange wire.
Verify +SV on yellow wire.
Verify -l2V on purple wire.
Verify + 10V on pin 3 of Q2.
My Test Results20DCV meter setting
At psu connector at board connector
orange 11.94V 11.94V
purp -11.9V -11.9V
yellow 4.96V 4.94V
Floppy
orange 11.94 Yellow 4.94
200m meter setting
Floppy
green - 41 blue/Purp/Wht - 5.1
Q2 visible circuit path pin
1 - 10.04
2-11.93
3-10.72
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]2009-07-10 by jammie
11.9 is fine remember it has a tolerance of + or - 10% its usually the currant side is the problem or ripple from the ripple caps you need to have an oscilliscope to test for the ripple
----- Original Message ----- From: Donavan To: emax@yahoogroups.com Sent: Friday, July 10, 2009 1:25 AM Subject: Re: [emax] Power Supply Voltage Question Hi Ted, Are you referring to the three pins coming form the AC receptacle: the green to the ground screw, and the blue and brown that go to the Toroid->power switch->AC IN? Do you recall where the problem was in the chain I described above? Do you have any insight into the voltage variance? Initially +11.9 seems "close enough", but I know there are some components that draw 0.02 and that missing 0.1 could be enough to cause a cascading problem. Also, just testing it now I had head phones plugged into Left Out and as soon as I unplugged the head phones the LCD went out with some residual corruption. I turned the Emax off and back on and the screen was fine. I tried this test two more times and I started to get the whine from the LCD screen (or a component right next to it). Now the forth time I turn it on the screen is off/corrupt from the start, the whine is still there but the disk loads and I still get audio. The fifth time I turn it off and back on the screen is just off completely, the whine is there (gets louder the long the unit is on), the floppy won't load completely and all the LEDs except the one at Record/Preset Management, Dynamic Allocation, Load All and Enter are on, and I get no audio of course. My assumption is that the voltage variance is causing this negative effect depending on certain variables, such as heat given that atoms can move around and the atoms can also hold more electrons, disrupting the flow of electrons through the conductor. Thanks for the help Patrick ________________________________ From: Ted Summers <djtbs1@...> To: emax@yahoogroups.com Sent: Thursday, July 9, 2009 6:22:08 AM Subject: Re: [emax] Power Supply Voltage Question My emax rack did this and it turned out to be a bad connection to the power supply on the AC connector. Regards, Ted On Jul 9, 2009, at 12:17 AM, Donavan wrote: Hi guys, My Emax hasn't been function again lately. I saw a posting by Jimmy Moore with a link to a german site about using an AT PSU. The description of the LCD corrupting and LED blinking is what struck me. My LCD goes blank, sometimes with some corrupt text visible, there is a whine that is comeing from the area of the keyboard by the LCD, and also all the LEDs light up and a CRC message can appear though this happens inconsistently. My question is what is the acceptable voltage variance? The diagnostics document I have say the VR1 can have +/- 5% variance, so on the required +5VDC a range of 4.75-5.25 is with in specs. Also, someone mentioned that the LCD (emulator_island? ) that the LCD can make this whine, but to your knowledge will this cause the other problems? Thanks Emax Specs Verify +12V on orange wire. Verify +SV on yellow wire. Verify -l2V on purple wire. Verify + 10V on pin 3 of Q2. My Test Results20DCV meter setting At psu connector at board connector orange 11.94V 11.94V purp -11.9V -11.9V yellow 4.96V 4.94V Floppy orange 11.94 Yellow 4.94 200m meter setting Floppy green - 41 blue/Purp/Wht - 5.1 Q2 visible circuit path pin 1 - 10.04 2-11.93 3-10.72 [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] ------------------------------------------------------------------------------ No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.387 / Virus Database: 270.13.8/2227 - Release Date: 07/09/09 05:55:00 [Non-text portions of this message have been removed]
2009-07-10 by Ted Summers
My problem was the AC connector (blue and brown) right on the power supply. The connector was white (but discolored brown as it was burnt up). When looking at the pins they were heavily oxidized or burnt so looked the metal was "flat" or matte, not shiny / gloss at all- somewhat "blackened" I can't really describe it better than that. If you fix equipment, you know what burned pins look like. If you don't fix equipment it can be hard to describe.... Thx, Ted On Jul 9, 2009, at 6:02 PM, jammie wrote: 11.9 is fine remember it has a tolerance of + or - 10% its usually the currant side is the problem or ripple from the ripple caps you need to have an oscilliscope to test for the ripple
----- Original Message ----- From: Donavan To: emax@yahoogroups.com Sent: Friday, July 10, 2009 1:25 AM Subject: Re: [emax] Power Supply Voltage Question Hi Ted, Are you referring to the three pins coming form the AC receptacle: the green to the ground screw, and the blue and brown that go to the Toroid->power switch->AC IN? Do you recall where the problem was in the chain I described above? Do you have any insight into the voltage variance? Initially +11.9 seems "close enough", but I know there are some components that draw 0.02 and that missing 0.1 could be enough to cause a cascading problem. Also, just testing it now I had head phones plugged into Left Out and as soon as I unplugged the head phones the LCD went out with some residual corruption. I turned the Emax off and back on and the screen was fine. I tried this test two more times and I started to get the whine from the LCD screen (or a component right next to it). Now the forth time I turn it on the screen is off/corrupt from the start, the whine is still there but the disk loads and I still get audio. The fifth time I turn it off and back on the screen is just off completely, the whine is there (gets louder the long the unit is on), the floppy won't load completely and all the LEDs except the one at Record/Preset Management, Dynamic Allocation, Load All and Enter are on, and I get no audio of course. My assumption is that the voltage variance is causing this negative effect depending on certain variables, such as heat given that atoms can move around and the atoms can also hold more electrons, disrupting the flow of electrons through the conductor. Thanks for the help Patrick ________________________________ From: Ted Summers <djtbs1@...> To: emax@yahoogroups.com Sent: Thursday, July 9, 2009 6:22:08 AM Subject: Re: [emax] Power Supply Voltage Question My emax rack did this and it turned out to be a bad connection to the power supply on the AC connector. Regards, Ted On Jul 9, 2009, at 12:17 AM, Donavan wrote: Hi guys, My Emax hasn't been function again lately. I saw a posting by Jimmy Moore with a link to a german site about using an AT PSU. The description of the LCD corrupting and LED blinking is what struck me. My LCD goes blank, sometimes with some corrupt text visible, there is a whine that is comeing from the area of the keyboard by the LCD, and also all the LEDs light up and a CRC message can appear though this happens inconsistently. My question is what is the acceptable voltage variance? The diagnostics document I have say the VR1 can have +/- 5% variance, so on the required +5VDC a range of 4.75-5.25 is with in specs. Also, someone mentioned that the LCD (emulator_island? ) that the LCD can make this whine, but to your knowledge will this cause the other problems? Thanks Emax Specs Verify +12V on orange wire. Verify +SV on yellow wire. Verify -l2V on purple wire. Verify + 10V on pin 3 of Q2. My Test Results20DCV meter setting At psu connector at board connector orange 11.94V 11.94V purp -11.9V -11.9V yellow 4.96V 4.94V Floppy orange 11.94 Yellow 4.94 200m meter setting Floppy green - 41 blue/Purp/Wht - 5.1 Q2 visible circuit path pin 1 - 10.04 2-11.93 3-10.72 [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] ---------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.387 / Virus Database: 270.13.8/2227 - Release Date: 07/09/09 05:55:00 [Non-text portions of this message have been removed] [Non-text portions of this message have been removed]
2009-07-10 by Donavan
Hey Guys thanks for the info. Ted, usually when I have needed to fix things the metal did take on a dull bluish tint so I'll take a look for that. Jammie, a quick check on oscilloscopes puts them at much more than the cost of a new psu. Perhaps just replacing the caps would be a more cost effective and long term solution. The vexing part is that the Emax has now been on and functioning for the last 4 hours with no problem. Also, the ambient room temperature is 73 degrees fahrenheit which rules out my hypothesis of it being heat related. Well, actually I just unplugged the headphones from the right jack and into the left jack and the LCD went corrupt and started to whine. Unplugged the unit for 4 minutes to discharge the caps, and unplugged the headphones and turned it back on with the same problem. Unplugged and waited for 13 more minutes and the LCD was back on and sound was fine. Plugged the headphone into left, into right and back into left and the LCD cut out but sound was still there and there was no whine. OK, I read the manual thinking maybe these audio out plugs were not hot swappable and it does say in the "instant gratification" section to plug into the outputs and then turn on. But I just did that from right, on, played OK, off, left stereo, on played OK, off, right mono, on LCD corrupt and the whine. This is a tricky one. What are you thoughts? Should I just replace the caps, or the whole PSU, is that the likely cause here? Thanks Patrick ________________________________
From: Ted Summers <djtbs1@...>
To: emax@yahoogroups.com
Sent: Thursday, July 9, 2009 8:19:46 PM
Subject: Re: [emax] Power Supply Voltage Question
My problem was the AC connector (blue and brown) right on the power
supply. The connector was white (but discolored brown as it was burnt
up). When looking at the pins they were heavily oxidized or burnt so
looked the metal was "flat" or matte, not shiny / gloss at all-
somewhat "blackened" I can't really describe it better than that.
If you fix equipment, you know what burned pins look like. If you
don't fix equipment it can be hard to describe....
Thx,
Ted
On Jul 9, 2009, at 6:02 PM, jammie wrote:
11.9 is fine remember it has a tolerance of + or - 10% its usually the
currant side is the problem or ripple from the ripple caps you need to
have an oscilliscope to test for the ripple
----- Original Message -----
From: Donavan
To: emax@yahoogroups. com
Sent: Friday, July 10, 2009 1:25 AM
Subject: Re: [emax] Power Supply Voltage Question
Hi Ted,
Are you referring to the three pins coming form the AC receptacle: the
green to the ground screw, and the blue and brown that go to the
Toroid->power switch->AC IN?
Do you recall where the problem was in the chain I described above?
Do you have any insight into the voltage variance? Initially +11.9
seems "close enough", but I know there are some components that draw
0.02 and that missing 0.1 could be enough to cause a cascading problem.
Also, just testing it now I had head phones plugged into Left Out and
as soon as I unplugged the head phones the LCD went out with some
residual corruption. I turned the Emax off and back on and the screen
was fine. I tried this test two more times and I started to get the
whine from the LCD screen (or a component right next to it).
Now the forth time I turn it on the screen is off/corrupt from the
start, the whine is still there but the disk loads and I still get
audio.
The fifth time I turn it off and back on the screen is just off
completely, the whine is there (gets louder the long the unit is on),
the floppy won't load completely and all the LEDs except the one at
Record/Preset Management, Dynamic Allocation, Load All and Enter are
on, and I get no audio of course.
My assumption is that the voltage variance is causing this negative
effect depending on certain variables, such as heat given that atoms
can move around and the atoms can also hold more electrons, disrupting
the flow of electrons through the conductor.
Thanks for the help
Patrick
____________ _________ _________ __
From: Ted Summers <djtbs1@gmail. com>
To: emax@yahoogroups. com
Sent: Thursday, July 9, 2009 6:22:08 AM
Subject: Re: [emax] Power Supply Voltage Question
My emax rack did this and it turned out to be a bad connection to the
power supply on the AC connector.
Regards,
Ted
On Jul 9, 2009, at 12:17 AM, Donavan wrote:
Hi guys,
My Emax hasn't been function again lately. I saw a posting by Jimmy
Moore with a link to a german site about using an AT PSU. The
description of the LCD corrupting and LED blinking is what struck me.
My LCD goes blank, sometimes with some corrupt text visible, there is
a whine that is comeing from the area of the keyboard by the LCD, and
also all the LEDs light up and a CRC message can appear though this
happens inconsistently.
My question is what is the acceptable voltage variance? The
diagnostics document I have say the VR1 can have +/- 5% variance, so
on the required +5VDC a range of 4.75-5.25 is with in specs.
Also, someone mentioned that the LCD (emulator_island? ) that the LCD
can make this whine, but to your knowledge will this cause the other
problems?
Thanks
Emax Specs
Verify +12V on orange wire.
Verify +SV on yellow wire.
Verify -l2V on purple wire.
Verify + 10V on pin 3 of Q2.
My Test Results20DCV meter setting
At psu connector at board connector
orange 11.94V 11.94V
purp -11.9V -11.9V
yellow 4.96V 4.94V
Floppy
orange 11.94 Yellow 4.94
200m meter setting
Floppy
green - 41 blue/Purp/Wht - 5.1
Q2 visible circuit path pin
1 - 10.04
2-11.93
3-10.72
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]
------------ --------- --------- --------- --------- --------- -
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.387 / Virus Database: 270.13.8/2227 - Release Date:
07/09/09 05:55:00
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]2009-07-10 by jammie
the wine is caused by the inverter chip either the back light is playing up or the inverter is on its way out also the inverter is from the 5v line so i would say the 5v regulator caps are not holding there charge but with out an oscillascope to test you will have to replace all caps as you wont know which ones are at fault change to 105oc grade as these suffer less from heat exhuastion which is the biggest fault for caps dying
----- Original Message ----- From: Donavan To: emax@yahoogroups.com Sent: Friday, July 10, 2009 6:44 AM Subject: Re: [emax] Power Supply Voltage Question Hey Guys thanks for the info. Ted, usually when I have needed to fix things the metal did take on a dull bluish tint so I'll take a look for that. Jammie, a quick check on oscilloscopes puts them at much more than the cost of a new psu. Perhaps just replacing the caps would be a more cost effective and long term solution. The vexing part is that the Emax has now been on and functioning for the last 4 hours with no problem. Also, the ambient room temperature is 73 degrees fahrenheit which rules out my hypothesis of it being heat related. Well, actually I just unplugged the headphones from the right jack and into the left jack and the LCD went corrupt and started to whine. Unplugged the unit for 4 minutes to discharge the caps, and unplugged the headphones and turned it back on with the same problem. Unplugged and waited for 13 more minutes and the LCD was back on and sound was fine. Plugged the headphone into left, into right and back into left and the LCD cut out but sound was still there and there was no whine. OK, I read the manual thinking maybe these audio out plugs were not hot swappable and it does say in the "instant gratification" section to plug into the outputs and then turn on. But I just did that from right, on, played OK, off, left stereo, on played OK, off, right mono, on LCD corrupt and the whine. This is a tricky one. What are you thoughts? Should I just replace the caps, or the whole PSU, is that the likely cause here? Thanks Patrick ________________________________ From: Ted Summers <djtbs1@...> To: emax@yahoogroups.com Sent: Thursday, July 9, 2009 8:19:46 PM Subject: Re: [emax] Power Supply Voltage Question My problem was the AC connector (blue and brown) right on the power supply. The connector was white (but discolored brown as it was burnt up). When looking at the pins they were heavily oxidized or burnt so looked the metal was "flat" or matte, not shiny / gloss at all- somewhat "blackened" I can't really describe it better than that. If you fix equipment, you know what burned pins look like. If you don't fix equipment it can be hard to describe.... Thx, Ted On Jul 9, 2009, at 6:02 PM, jammie wrote: 11.9 is fine remember it has a tolerance of + or - 10% its usually the currant side is the problem or ripple from the ripple caps you need to have an oscilliscope to test for the ripple ----- Original Message ----- From: Donavan To: emax@yahoogroups. com Sent: Friday, July 10, 2009 1:25 AM Subject: Re: [emax] Power Supply Voltage Question Hi Ted, Are you referring to the three pins coming form the AC receptacle: the green to the ground screw, and the blue and brown that go to the Toroid->power switch->AC IN? Do you recall where the problem was in the chain I described above? Do you have any insight into the voltage variance? Initially +11.9 seems "close enough", but I know there are some components that draw 0.02 and that missing 0.1 could be enough to cause a cascading problem. Also, just testing it now I had head phones plugged into Left Out and as soon as I unplugged the head phones the LCD went out with some residual corruption. I turned the Emax off and back on and the screen was fine. I tried this test two more times and I started to get the whine from the LCD screen (or a component right next to it). Now the forth time I turn it on the screen is off/corrupt from the start, the whine is still there but the disk loads and I still get audio. The fifth time I turn it off and back on the screen is just off completely, the whine is there (gets louder the long the unit is on), the floppy won't load completely and all the LEDs except the one at Record/Preset Management, Dynamic Allocation, Load All and Enter are on, and I get no audio of course. My assumption is that the voltage variance is causing this negative effect depending on certain variables, such as heat given that atoms can move around and the atoms can also hold more electrons, disrupting the flow of electrons through the conductor. Thanks for the help Patrick ____________ _________ _________ __ From: Ted Summers <djtbs1@gmail. com> To: emax@yahoogroups. com Sent: Thursday, July 9, 2009 6:22:08 AM Subject: Re: [emax] Power Supply Voltage Question My emax rack did this and it turned out to be a bad connection to the power supply on the AC connector. Regards, Ted On Jul 9, 2009, at 12:17 AM, Donavan wrote: Hi guys, My Emax hasn't been function again lately. I saw a posting by Jimmy Moore with a link to a german site about using an AT PSU. The description of the LCD corrupting and LED blinking is what struck me. My LCD goes blank, sometimes with some corrupt text visible, there is a whine that is comeing from the area of the keyboard by the LCD, and also all the LEDs light up and a CRC message can appear though this happens inconsistently. My question is what is the acceptable voltage variance? The diagnostics document I have say the VR1 can have +/- 5% variance, so on the required +5VDC a range of 4.75-5.25 is with in specs. Also, someone mentioned that the LCD (emulator_island? ) that the LCD can make this whine, but to your knowledge will this cause the other problems? Thanks Emax Specs Verify +12V on orange wire. Verify +SV on yellow wire. Verify -l2V on purple wire. Verify + 10V on pin 3 of Q2. My Test Results20DCV meter setting At psu connector at board connector orange 11.94V 11.94V purp -11.9V -11.9V yellow 4.96V 4.94V Floppy orange 11.94 Yellow 4.94 200m meter setting Floppy green - 41 blue/Purp/Wht - 5.1 Q2 visible circuit path pin 1 - 10.04 2-11.93 3-10.72 [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] ------------ --------- --------- --------- --------- --------- - No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.387 / Virus Database: 270.13.8/2227 - Release Date: 07/09/09 05:55:00 [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] ------------------------------------------------------------------------------ No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.387 / Virus Database: 270.13.8/2227 - Release Date: 07/09/09 05:55:00 [Non-text portions of this message have been removed]