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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Balanced Power and Pick up lens lifespan
Hi,
Using a balanced power supply is it possible the effect of "Negative" presents in a CD player after being switched off may shorten the life span of the laser unit (pickup lens)? In normal power supply the switch usually cuts the hot(live) and so no voltage should present in a Cd player. But in the case of balance power supply the switch only cuts the +ve incoming current but the -ve left undisturbed. This I think affects the lifespan of the laser unit since I have changed 4 over 8 or 10 years. My friend who uses identical equipment but unplugs everything after usage got no problem with his pick up lens. Same problem with different type of players. Voltage and other issues are all eliminated. Pardon my poor command of english. Thanks. Regards, ST |
#2
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Balanced Power and Pick up lens lifespan
What you're saying is completely untrue. Electronic equipment is not
designed that way. |
#3
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Balanced Power and Pick up lens lifespan
On Mar 5, 10:16*am, "William Sommerwerck"
wrote: What you're saying is completely untrue. Electronic equipment is not designed that way. Ok, in the case of reverse polarity -will there be any voltage in the CD player even after it is the CD PLAYER switch is switched off? That won't have whatsoever effect on diodes and other components? |
#4
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Balanced Power and Pick up lens lifespan
What you're saying is completely untrue. Electronic equipment is not
designed that way. Ok, in the case of reverse polarity -will there be any voltage in the CD player even after it is the CD PLAYER switch is switched off? That won't have whatsoever effect on diodes and other components? If the player does not have a "hard" power-supply switch -- and many don't -- there will be a turn-on circuit that draws a bit of power. But there would no reason for leaving the main power supplies on -- and especially (in a device using balanced supplies) leaving one on and the other off. No designer in his right mind would leave the laser diode running all the time. They have a limited lifespan, and you don't waste it. |
#5
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Balanced Power and Pick up lens lifespan
On Mar 5, 11:05*am, "William Sommerwerck"
wrote: What you're saying is completely untrue. Electronic equipment is not designed that way. Ok, in the case of reverse polarity -will there be any voltage in the CD player even after it is the CD PLAYER switch is switched off? That won't have whatsoever effect on diodes and other components? If the player does not have a "hard" power-supply switch -- and many don't -- there will be a turn-on circuit that draws a bit of power. But there would no reason for leaving the main power supplies on -- and especially (in a device using balanced supplies) leaving one on and the other off. No designer in his right mind would leave the laser diode running all the time. They have a limited lifespan, and you don't waste it. Thanks. I think you just answered my question as to why I have been changing pick up lens more often then others. I still welcome any other info. Cheers. |
#6
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Balanced Power and Pick up lens lifespan
ST wrote:
Hi, Using a balanced power supply is it possible the effect of "Negative" presents in a CD player after being switched off may shorten the life span of the laser unit (pickup lens)? In normal power supply the switch usually cuts the hot(live) and so no voltage should present in a Cd player. But in the case of balance power supply the switch only cuts the +ve incoming current but the -ve left undisturbed. This I think affects the lifespan of the laser unit since I have changed 4 over 8 or 10 years. My friend who uses identical equipment but unplugs everything after usage got no problem with his pick up lens. Same problem with different type of players. Voltage and other issues are all eliminated. Pardon my poor command of english. Thanks. Regards, ST Good morning, While I agree with Mr. Sommerwerck, I did see one implementation of a Sony mechanism that had the laser burning any time the machine was switched on. The only time the laser shut off was when the front panel 'power' switch (actually a standby switch) was in the off position, or of course if the AC mains was disconnected. This was an implementation from around 1996, and used the KSS-240A laser. The next version did not do this. Regards, Tim Schwartz Bristol Electronics |
#7
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Balanced Power and Pick up lens lifespan
On Mar 5, 8:19*pm, Tim Schwartz wrote:
ST wrote: Hi, Using a balanced power supply is it possible the effect of *"Negative" presents in a CD player after being switched off may shorten the life span of the laser unit (pickup lens)? In normal *power supply the switch usually cuts the hot(live) and so no voltage should present in a Cd player. But in the case of balance power supply the switch only cuts the +ve incoming current but the -ve left undisturbed. This I ***** affects the lifespan of the laser unit since I have changed 4 over 8 or 10 years. My friend who uses identical equipment but unplugs everything after usage got no problem with his pick up lens. Same problem with different type of players. Voltage and other issues are all eliminated. Pardon my poor command of english. Thanks. Regards, ST Good morning, * * * * While I agree with Mr. Sommerwerck, *I did see one implementation of a Sony mechanism that had the laser burning any time the machine was switched on. The only time the laser shut off was when the front panel 'power' switch (actually a standby switch) was in the off position, or of course if the AC mains was disconnected. *This was an implementation from around 1996, and used the KSS-240A laser. *The next version did not do this. Regards, Tim Schwartz Bristol Electronics Curiously, all the pickup lens that died were of Sony pickup lens in the so called High End Universal transport. Anyway, I am still looking for a specific answer, i.e, When the polarity is reversed would the live end in the CD player shortened the life span of the laser unit despite the power switch (hard switch without stand by) off? Thank you and kind regards, Chelvam |
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