good advices. All this must already done before first check of RF signal to avoid unnecessary risks for damage the very low-quality "original equipment" diode "SLD-104U" in use by the KSS-272A.
An other great deficiency are various leaked electrolytic capacitors (in a SMD outline) on the PCB of the disc motor (turntable/spindle motor).
Also the quality standart of those capacitors was the worst possible (in many cases, the conductors are eaten so much that they have already disappeared).
Sanyo OSCON was here the best choice - so I think.
In the meantime, I refuse service to these ESPRIT stuff from SONY, because I note by compare even to the cheapest JVC CD devices - equipped with "OPTIMA" optical pick up - that the parts quality here was significantly higher.
The Evidence is very clear - most of JVC CD player stuff works fine without any issues after perform usual maintenance work - independend of the price class.
Also Pioneer and much other with "First Generation" Philips stuff (CDM 0-4) are much more easy by service than SONY ESPRIT with KSS laserheads.
Even in case of reintroduce of this coveted KSS units, extensive repairs in other sections are additional needed in most cases.
An other great deficiency are various leaked electrolytic capacitors (in a SMD outline) on the PCB of the disc motor (turntable/spindle motor).
Also the quality standart of those capacitors was the worst possible (in many cases, the conductors are eaten so much that they have already disappeared).
Sanyo OSCON was here the best choice - so I think.
In the meantime, I refuse service to these ESPRIT stuff from SONY, because I note by compare even to the cheapest JVC CD devices - equipped with "OPTIMA" optical pick up - that the parts quality here was significantly higher.
The Evidence is very clear - most of JVC CD player stuff works fine without any issues after perform usual maintenance work - independend of the price class.
Also Pioneer and much other with "First Generation" Philips stuff (CDM 0-4) are much more easy by service than SONY ESPRIT with KSS laserheads.
Even in case of reintroduce of this coveted KSS units, extensive repairs in other sections are additional needed in most cases.
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On my CDP-501ES BSL motor does not run. I just resoldered BSL board as tubeboob suggested, still the same. There is Q201, disc brake cancel switch, which allows or shuts square wave signal to pin 8 of IC201, CX193 disc motor servo. Q201 is always on, even when CD is inserted, grounding that signal. I disconnected base of Q201 and got square wave on pin 8, but disc motor still would not run... I couldn't see saw tooth signal on pins 1 and 3 of CX193, even with sqare wave on input (pin 8). Any idea?
it must be this mechanism:
http://forum.vintage-audio-laser.com/photoperso/sony/modif-cdp101/cdp501es.png
The KSS-100A seems to be the most reliable head of the KSS series.
This means, that in cases of not right working, that other parts must replace.
Without a second device of the same model in working condition troubleshooting is for me to time-consuming. Crosswise replace of parts save a lot of time by error fixing.
http://forum.vintage-audio-laser.com/photoperso/sony/modif-cdp101/cdp501es.png
The KSS-100A seems to be the most reliable head of the KSS series.
This means, that in cases of not right working, that other parts must replace.
Without a second device of the same model in working condition troubleshooting is for me to time-consuming. Crosswise replace of parts save a lot of time by error fixing.
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check out this offers
http://www.abtronics.ru/components/CX193SONY_good_24563539.html
Sansui Xr-q9 Sony Ps-x45 Circuito Intgrado Cx193 Toca Disco - R$ 159,00 no MercadoLivre
CX193 also in use here:
Sony PS-X45 Owners Manual, Service Manual, Schematics, Free Download | Vinyl Engine
Sansui XR-Q9 Owners Manual, Service Manual, Schematics, Free Download | Vinyl Engine
and by CDP101:
Dicas de Reparação - Defeitos - Avarias
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Hi, Tomtom
The Sony CDP-501ES is almost identical to the Sony CDP-101 internally and shares the same inherent faults, Primarily the STK6922 (BX1201) focus and tracking servo ic's failing!
have a look at; Adrian-Kingston.com - Sony CDP-101 CD Player
Hope this is of some help.
Simon.
The Sony CDP-501ES is almost identical to the Sony CDP-101 internally and shares the same inherent faults, Primarily the STK6922 (BX1201) focus and tracking servo ic's failing!
have a look at; Adrian-Kingston.com - Sony CDP-101 CD Player
Hope this is of some help.
Simon.
Replace of Laser Diode - Image Series
check out this thread:
http://www.diyaudio.com/forums/digital-source/225968-toshiba-dlba2z002b-laser.html
check out this thread:
http://www.diyaudio.com/forums/digital-source/225968-toshiba-dlba2z002b-laser.html
tubeboob:
i just saw your post.
thanks for posting this.
did you ever get your machine "fixed"?
i have a 779 that, probably once a month, shows this issue.
i plan to open it and take some measurements.
sony has bit me repeatedly in the past with cold solder joints, especially in TVs and in particular, the tuner modules. after the last one, i switched to mitsubishi, only to get bit by the smd leaky caps problem.
mlloyd1
i just saw your post.
thanks for posting this.
did you ever get your machine "fixed"?
i have a 779 that, probably once a month, shows this issue.
i plan to open it and take some measurements.
sony has bit me repeatedly in the past with cold solder joints, especially in TVs and in particular, the tuner modules. after the last one, i switched to mitsubishi, only to get bit by the smd leaky caps problem.
mlloyd1
This is a handy site to show what Sony units have which lasers:
TVK: Sony resource: laser pickups
TVK: Sony resource: laser pickups
good overview - thank you.
the mentioned item numbers of laser diodes under post #17 about
http://www.diyaudio.com/forums/digital-source/225968-toshiba-dlba2z002b-laser.html
are suited not only for the KSS-151A. I think, this diode is suited for the most of the KSS-series also for KSS-272A, KSS-273A and KSS-274A.
The actually question is now, which companies are there to carry out the exchange and the follow adjust of the APC circuit.
tubeboob:
i just saw your post.
thanks for posting this.
did you ever get your machine "fixed"?
i have a 779 that, probably once a month, shows this issue.
i plan to open it and take some measurements.
sony has bit me repeatedly in the past with cold solder joints, especially in TVs and in particular, the tuner modules. after the last one, i switched to mitsubishi, only to get bit by the smd leaky caps problem.
mlloyd1
I haven't had it looked at as this particular CD player is sitting in its box in storage. I haven't found a competent tech that I trust to handle the repair. If you know any one in the NYC area, please let me know.
Last time I played it, it played just fine, and the issue is intermittent.
How did yours turn out?
Who did your repair?
Cheers
tubeboob:
i did my own repairs. however, as i get older i find i enjoy doing repair work less and less though. i guess it's my 55 years old eyes and fingers, while electronics keeps getting smaller.
i have seen no problems with the machine since the repairs, but it was a very intermittent issue, so it's probably too early to declare victory ...
ilimzn's original message contains the useful info:
"The solution is simple: change R961 from 4.7k to 820 ohms.
There are a few optional steps that can be taken to further improve things, including long term reliability:
Changing C963 from 2200uF/10V to say 4700uF/6.3V additionally improves Vee stiffness and stability. Often just doing that without the R961 fix reduces the skipping problem, clearly showing Vee is the culprit.
The 5V output is invariably a bit high, around 5.2 - 5.3V. It can be trimmed closer to 5.1V as stated in the manual by soldering a 27k resistor in parallel to R956, on the bottom side of the board. This is important because the laser head is supplied with this voltage, so overvolting is not at all desirable here. The 6V voltage (incorrectly labeled as 7V in the manual!) is not that critical and can be left alone."
i made all the recommended changes.
mlloyd1
i did my own repairs. however, as i get older i find i enjoy doing repair work less and less though. i guess it's my 55 years old eyes and fingers, while electronics keeps getting smaller.
i have seen no problems with the machine since the repairs, but it was a very intermittent issue, so it's probably too early to declare victory ...
ilimzn's original message contains the useful info:
"The solution is simple: change R961 from 4.7k to 820 ohms.
There are a few optional steps that can be taken to further improve things, including long term reliability:
Changing C963 from 2200uF/10V to say 4700uF/6.3V additionally improves Vee stiffness and stability. Often just doing that without the R961 fix reduces the skipping problem, clearly showing Vee is the culprit.
The 5V output is invariably a bit high, around 5.2 - 5.3V. It can be trimmed closer to 5.1V as stated in the manual by soldering a 27k resistor in parallel to R956, on the bottom side of the board. This is important because the laser head is supplied with this voltage, so overvolting is not at all desirable here. The 6V voltage (incorrectly labeled as 7V in the manual!) is not that critical and can be left alone."
i made all the recommended changes.
mlloyd1
KSS210A
Recently got hold of a sony CD player which uses KSS210a laser and found it was jumping around unable to read all the tracks. I had the same problem on an Arcam 7 and replaced the laser there - no problems.
So i got a new kss210a from HK and fitted it to the new sony, and the motor does not spin up, put the old one back, motor spins OK. Checked wiring to see if I'd busted something, all seems fine.
got out big magnifying glass to see if there was any difference between the 2 - they seem identical.
I read somewhere about removing an ESD strap on the KSS210A. I can't see any difference between the old and new one, so my question is - is there an ESD strap and where is it
CHeers Tim S
Recently got hold of a sony CD player which uses KSS210a laser and found it was jumping around unable to read all the tracks. I had the same problem on an Arcam 7 and replaced the laser there - no problems.
So i got a new kss210a from HK and fitted it to the new sony, and the motor does not spin up, put the old one back, motor spins OK. Checked wiring to see if I'd busted something, all seems fine.
got out big magnifying glass to see if there was any difference between the 2 - they seem identical.
I read somewhere about removing an ESD strap on the KSS210A. I can't see any difference between the old and new one, so my question is - is there an ESD strap and where is it
CHeers Tim S
check out post #32 about
http://www.diyaudio.com/forums/digi...04u-sony-esprit-kss-series-4.html#post3867475
http://www.diyaudio.com/forums/digi...04u-sony-esprit-kss-series-4.html#post3867475