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-Pjackso
Joined: 31 Mar 2006
Posts: 791
Location: Oklahoma
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| Posted: Sun Sep 16, 2012 4:16 am Post subject: |
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IC528 has 5.6v on one leg, 0.68 on center leg, and 15.9v on the opposite. (dc)
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Sep 16, 2012 2:53 pm Post subject: |
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Figures it wouldn't be easy.
On the same board and in the same area there should be 2 diodes, D520 and D521. Test voltage in and out. Should be 5.6v in and 4.9v out.
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-Pjackso
Joined: 31 Mar 2006
Posts: 791
Location: Oklahoma
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| Posted: Mon Sep 17, 2012 2:38 am Post subject: |
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D520 and D521 both are good. (4.9V out, both)
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Sep 18, 2012 1:01 am Post subject: |
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On that same board look for connector CB510. Look for pin PRY. DMM on DC look for 5v on that line. Try pushing the power button while testing.
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-Pjackso
Joined: 31 Mar 2006
Posts: 791
Location: Oklahoma
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| Posted: Wed Sep 19, 2012 2:13 am Post subject: |
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CB510, pin PRY is 0V with or without power button.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Sep 19, 2012 3:32 pm Post subject: |
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Ok, same board, look for connector CB514, pin PSW. DMM on DC you should have +5v every time you push the power button.
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-Pjackso
Joined: 31 Mar 2006
Posts: 791
Location: Oklahoma
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| Posted: Thu Sep 20, 2012 2:44 am Post subject: |
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CB514 pin PSW is 0.0v nominal, and 4.91V when the power button is pushed.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Sep 20, 2012 10:59 pm Post subject: |
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Ok, we are almost near a decision. On that same board, same connector(CB514) there is pin REM. I would like to disconnect this from the board. Is this a harness that connects to the board? If it is, even if you have to cut that wire. Then see if it powers on normal. I think I know where we will be going with this but I just need to rule this out.
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-Pjackso
Joined: 31 Mar 2006
Posts: 791
Location: Oklahoma
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| Posted: Fri Sep 21, 2012 4:09 am Post subject: |
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CB514 is a ribbon cable with exposed lead-contacts on the ends.
I used some electrical tape and covered the contact for pin REM. (oddly it was REM on one board, and PEM on the connecting board - but still the same pin) I verified with the DMM that the REM pins weren't connected.
I pressed the on-button, but nothing happens.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Sep 21, 2012 4:21 pm Post subject: |
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Ok, so here's where we're at. You have the control signal to the MCU to turn on the unit but it is not outputting the signal to turn the relay on. So the main mcu is not functioning properly. And your mcu is receiving it's main power to function. However, this does not mean the mcu is bad. Based on the various tests you did and how it originally acted I think it may just be a bad crystal, which would be XL501. If the crystal is not working then the mcu would be dead.
Now we could jump start the receiver to see if it powers up and if there are are other functions working which would maybe help verify if it's the crystal or not, or just change the crystal and see what happens.
If it's not the crystal then it's possibly the mcu itself. But I'm not leaning that way just yet. What would you like to do?
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-Pjackso
Joined: 31 Mar 2006
Posts: 791
Location: Oklahoma
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| Posted: Sat Sep 22, 2012 3:58 am Post subject: |
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Lets try jump-starting it.
1) What functions use the crystal, and which functions use the MCU?
2) I found crystal XL601, but didn't find XL501. Any tips where it is?
3) What is a MCU? (Master Control Unit?) ...does it contain the Master Control Program (MCP)?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Sep 22, 2012 2:47 pm Post subject: |
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| -Pjackso wrote: | Lets try jump-starting it.
1) What functions use the crystal, and which functions use the MCU?
It doesn't work that way. The mcu needs the crystal to function. They work together.
2) I found crystal XL601, but didn't find XL501. Any tips where it is?
IC526 is the mcu. The crystal should be right next to it. Both the schematic and parts section name it XL501. Maybe that 5 just looks like a 6.
3) What is a MCU? (Master Control Unit?) ...does it contain the Master Control Program (MCP)?
Microprocessor control unit.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Sep 22, 2012 2:54 pm Post subject: |
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With the receiver unplugged locate CB510, PRY pin. Make sure it's PRY and not PRV which is right next to it. Connect a small gauge piece of wire to it, (PRY).
Now locate CB514, pin +5m2 and connect the other end of that wire to it.
Now plug it in and you should hear the power relay that you tested in the beginning latch up. If you hear it latch see if the display lights up and if there are any functions. If you see smoke then unplug it....  but look for where it's coming from.
Make sure there are no speakers or sources connected.
Post results.
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-Pjackso
Joined: 31 Mar 2006
Posts: 791
Location: Oklahoma
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| Posted: Tue Oct 09, 2012 10:18 pm Post subject: |
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Hi Mac,
sorry for the delay.
I connected a wire to CB510 PRY (not PRV) and jumped over to CB514 +5M.
(Note: There was a +5 and a +5M, but no +5M2)
I plugged it in. No magic smoke escaped.
Vdc on the jumper wire was +4.8v.
The relay didn't click very loud, but was more prevalent (un-clicking) when unplugged.
Unfortunately, the receiver was still dead. The power button still doesn't do anything.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Oct 10, 2012 4:57 pm Post subject: |
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Pretty much what I expected. At this point I would try changing that crystal. Cause if that's not it then it's probably the MCU.
But, the fact that it worked a couple times after unplugging in the beginning shifts it more towards the crystal.
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-Pjackso
Joined: 31 Mar 2006
Posts: 791
Location: Oklahoma
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| Posted: Thu Oct 11, 2012 1:51 am Post subject: |
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Ok, deal.
What crystal should I buy, and since I'm only buying the crystal - can you recommend a website?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Oct 11, 2012 2:10 pm Post subject: |
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| -Pjackso wrote: | Ok, deal.
What crystal should I buy, and since I'm only buying the crystal - can you recommend a website? |
The crystal by part number is not available. So we need to order it by type, style/size and frequency. So I need you to snap a picture of it so I can see what style it is. I already know the frequency and type.
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-Pjackso
Joined: 31 Mar 2006
Posts: 791
Location: Oklahoma
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| Posted: Tue Oct 16, 2012 2:49 am Post subject: |
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Ok, I finally got a picture taken.
The picture is misleading - it actually says "16.00X".
Reference 2 pictures (wide and closeup).
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macgyver655
Joined: 22 Aug 2007
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-Pjackso
Joined: 31 Mar 2006
Posts: 791
Location: Oklahoma
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| Posted: Thu Oct 18, 2012 10:57 pm Post subject: |
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Thanks Mac!
I'll get that ordered.
The replacement has long(ish) legs, so I'm sure it'll fit.
There's three legs. Will it matter if it's reversed when installing it?
Or is there markings to watch for?
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