By supplies to Z203 and 208, do you mean the input voltage? Where should I connect the negative terminal of my multimeter?
I have to admit I don't even see Z203 on the drawing, I was just going by that blurb you posted. Z208 is shown on sheet 2. It is a 7805 regulator with output, the interesting part, at TP2. The tab of the 7805 is at ground. I'm thinking that if the unit is obeying the front panel controls then the 5 volt supplies are probably good too.
Once again, did you unplug the cable for the pickup assembly?
Once again, did you unplug the cable for the pickup assembly?
I did unplug the cable, yes. I made very sure that everything was correctly re-seated though.
I'm just going to measure Z203 & Z208. Incidentally, 203 is on sheet 3 on the bottom left.
I'll sort out sheets 1 and 4 later on.
I'm just going to measure Z203 & Z208. Incidentally, 203 is on sheet 3 on the bottom left.
I'll sort out sheets 1 and 4 later on.
Ok. The problem with the connector for the pickup, usually some kind of ribbon cable, is not that it often gets re-connected wrong. It's that the supply for the laser diode runs through it and in some designs those lines can be extremely voltage sensitive and need to be shorted before disconnecting to protect the diode from ESD, otherwise it's easy to flatten it.
I've checked the output on Z208 - 5V dead on. I can't find Z203 on the PCB anywhere!
Upon unplugging the DAC board and turning on, the disc span up as per before the repair.
I know what you mean about the laser diode, although it still gives out a beam (perhaps it's not that simple).
Upon unplugging the DAC board and turning on, the disc span up as per before the repair.
I know what you mean about the laser diode, although it still gives out a beam (perhaps it's not that simple).
We can attempt to measure the diode current to see that it is not maxed out (diode OK). We can also attempt to see if the focus OK line that Mooly was talking about ever goes high. That might be hard to see with a DVM. Either way, need drawings.
Sheets 1 and 4:
Not sure if sheet 1 is relevant given the title. 4 doesn't look like much use either.
Perhaps the DAC circuit is what you need (it's a separate file consisting of 10 drawings)?
Not sure if sheet 1 is relevant given the title. 4 doesn't look like much use either.
Perhaps the DAC circuit is what you need (it's a separate file consisting of 10 drawings)?
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Yeah, darn. That's just the system microcontroller. Maybe you could post the "DAC" file in archive form.
7/8/9 service manual:
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Alpha 9 DAC manual:
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Alpha 9 DAC manual:
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I think I may have ran you around a little bit. Looking back at sheet 3 you can see at connector SK201 the FOK line at pin 18. The CDM14 mech seems to have all the servo and demodulator goodies integrated, and none of that stuff is in the Arcam drawings. (unless I missed something). The good news is unplugging that connector probably wouldn't have done anything. The bad news is I can't help you troubleshoot the other side of it.
See if you can get your meter on that FOK position and find whether it toggles when the player is trying to focus.
See if you can get your meter on that FOK position and find whether it toggles when the player is trying to focus.
quick suggestion, replece the rubicon 25v 1000uf caps near the power supply. i have come across a few alpha 8,9'cdp's that had similar problems due to these caps. IIRC there are 5 or 6 of them near the powersupply
I'll have a look at the manuals... remind me... apart from it not reading discs is there any "unusual" behaviour, display issues etc. Draw opens/closes OK etc.
I changed 4 of the 25V 1000uF caps yesterday, the 4 closest the power supply (I replaced them with 35V 1000uF caps as suggested by mooly). Those were the only caps with bulging/leakage. I might change the other 2 or so that lurk in different areas to be sure.
Just re-posting sheets 2 and 3. I accidentally deleted them from my Photobucket account.
I'll see if I can dig up any info on that FOK signal for the Sony mech. I can't see anything on the Arcam layout diagram which looks useful.
Cheers
Just re-posting sheets 2 and 3. I accidentally deleted them from my Photobucket account.
I'll see if I can dig up any info on that FOK signal for the Sony mech. I can't see anything on the Arcam layout diagram which looks useful.
Cheers
This may sound like it's covering old ground or not relevant but let's be sure. We know it's had a PSU fault so let's be absolutely certain all is OK before moving on.
Also without having the unit in front of me... well that makes it more difficult just referring to a PC screen and not being able to actually see what's in there 🙂
On the PSU circuit top left is connector SK204. Check those 5 voltages are correct. Also on pin 8 there is something marked RLYV. What is the voltage on there ?
I notice regulator Z206 on the PSU has a switch ???? SW201C... Whats that ? It looks as though it's to cut power to the reg Z208. Check around there... is that 5 volts OK from that "switched" reg. Should be on that connector SK204. I guess that's if you use an external DAC etc.
Can you confirm that APART from the fact it doesn't spin a disc up it otherwise behaves OK? Is there anything that doesn't behave as expected? If so then the pickup is looking suspect ? Was it all "original" when you got it or has it been worked on before ?
If it's the KSS240 laser assembly these are readily available and cheap.
Don't know how easy it is to work on in situ but the FOK line is (appears to be) brought out on connector SK201 pin 18, on page 16 of the main manual although it isn't used. Can you measure there ? It's the flexiprint to the mech.
If any "clock" signals etc were missing then things usually take off, motors running at full speed etc, so I don't think anything like that is going on here.
Also without having the unit in front of me... well that makes it more difficult just referring to a PC screen and not being able to actually see what's in there 🙂
On the PSU circuit top left is connector SK204. Check those 5 voltages are correct. Also on pin 8 there is something marked RLYV. What is the voltage on there ?
I notice regulator Z206 on the PSU has a switch ???? SW201C... Whats that ? It looks as though it's to cut power to the reg Z208. Check around there... is that 5 volts OK from that "switched" reg. Should be on that connector SK204. I guess that's if you use an external DAC etc.
Can you confirm that APART from the fact it doesn't spin a disc up it otherwise behaves OK? Is there anything that doesn't behave as expected? If so then the pickup is looking suspect ? Was it all "original" when you got it or has it been worked on before ?
If it's the KSS240 laser assembly these are readily available and cheap.
Don't know how easy it is to work on in situ but the FOK line is (appears to be) brought out on connector SK201 pin 18, on page 16 of the main manual although it isn't used. Can you measure there ? It's the flexiprint to the mech.
If any "clock" signals etc were missing then things usually take off, motors running at full speed etc, so I don't think anything like that is going on here.
Danza, just to mention: The signal on the FOK line is not real fancy. It will probably remain at around 0 volts until the focus servo achieves lock, then it will go high (5V) for as long as it can hold lock or until the control processor tells the mech to give up trying to read the disc. If you get lock then the laser is OK and the troubleshooting could get fancy. An oscilloscope may eventually be necessary.
Cheers for yet more input guys, my Alpha 9 may just work again!
Yes, it seems fairly controlled - not 'spasming' or anything like that. It just illuminates, bobs up and down twice then rests. I'll try to measure the FOK signal later when I'm at home. I'll also check the various voltages mentioned at the same time, then reply later with the results (if I haven't blown it up).
Cheers
Yes, it seems fairly controlled - not 'spasming' or anything like that. It just illuminates, bobs up and down twice then rests. I'll try to measure the FOK signal later when I'm at home. I'll also check the various voltages mentioned at the same time, then reply later with the results (if I haven't blown it up).
Cheers
Lol OK then 🙂
It's sounding a bit like the pickup is duff tbh... around £15... has it been twiddled before you got it ?
It's sounding a bit like the pickup is duff tbh... around £15... has it been twiddled before you got it ?
If it came to it,
Your Search Results | CPC
one of those is a Japanese part ... mmmm
or originals ?... how much,
Search results for kss240
that's outrageous lol
Your Search Results | CPC
one of those is a Japanese part ... mmmm
or originals ?... how much,
Search results for kss240
that's outrageous lol
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