My R7G just started reading P5 intermitently. Could be power supply problem.
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| [CLD-R7G] Reading P5 https://forum.lddb.com/viewtopic.php?f=53&t=963 |
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| Author: | remington [ 23 Mar 2012, 00:45 ] |
| Post subject: | [CLD-R7G] Reading P5 |
My R7G just started reading P5 intermitently. Could be power supply problem.
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| Author: | rein-o [ 23 Mar 2012, 15:50 ] |
| Post subject: | Re: R7G reading P5 |
Good luck 
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| Author: | krbahr [ 23 Mar 2012, 20:47 ] |
| Post subject: | Re: R7G reading P5 |
My theory for this is that is should be the power supply and just maybe the spindle motor. Have not worked this problem yet. It is just not starting up fast enough and timing out gettin gto the speed expected. |
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| Author: | remington [ 23 Mar 2012, 23:40 ] |
| Post subject: | Re: R7G reading P5 |
It sounds like it can't get up to speed like you said. It's my favorite unit so I went into a bit of a panic initially. I used to take these machines apart but stopped a while ago especially with the higher end ones because I just got to unsure. Edit; to rein-o. For the past week i've tried various disc to no avail. Originally I thought is was a Japanese disc but soon discovered that wasn't the case. |
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| Author: | krbahr [ 25 Mar 2012, 01:43 ] |
| Post subject: | Re: R7G reading P5 |
I'm guessing it does fine with CD's. Do you have any 8 inch LD's to try or a 5 inch CDV? |
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| Author: | remington [ 25 Mar 2012, 20:23 ] |
| Post subject: | Re: R7G reading P5 |
krbahr wrote: I'm guessing it does fine with CD's. Do you have any 8 inch LD's to try or a 5 inch CDV? I recently tried an 8 inch repeatedly and it worked. However even with 12 inch discs the problem is intermittent. Sometimes it will read P5 after seven or more tries, then play. Other times I can't get it to play at all until the "next day". More often, it doesn't play. |
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| Author: | krbahr [ 26 Mar 2012, 01:21 ] |
| Post subject: | Re: R7G reading P5 |
The 8" disc is much lighter. So the question is does the motor draw too much current and need replacement or is the power supply faulty and cannot supply the current? |
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| Author: | remington [ 28 Mar 2012, 03:44 ] |
| Post subject: | Re: R7G reading P5 |
krbahr wrote: The 8" disc is much lighter. So the question is does the motor draw too much current and need replacement or is the power supply faulty and cannot supply the current? Yes it's definitelty weight. My hunch is not enough power based simply on the inability of the unit to "build up enough revolution." I never thought about too much current. For a while I was using a step down transformer because other Japanese units require that . I later discover through other users of the R7G that 110 voltage was sufficient and it was built for that. I wonder if that period of using the step down effected it somehow? It ran fine with the step down but it's just suspicious now that I have this problem. The problem did develop while the step down was being used. |
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| Author: | rein-o [ 28 Mar 2012, 04:15 ] |
| Post subject: | Re: R7G reading P5 |
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| Author: | krbahr [ 28 Mar 2012, 22:59 ] |
| Post subject: | Re: R7G reading P5 |
I agree either capacitors or the spindle motor but I would look at the supply first. I need to correct one thing in my last statement, a motor can draw too much current as the motor has issues and it is taking more current than normal to get it going. This is either motor asking for more current than the supply design can offer or the caps bad in the supply it it is on the edge of being able to supply the normal current needs. Switching power supplies work on demand, they supply what is needed. They have a feedback circuit to control the amount of power required at that time, this is how they run cooler. During motor spin-up the switching supply supplies the peak current then throttles back to what is needed after the disc is spinning. Linear supplies have full power all the time so more heat is dissipated and lost to heat as they run throttle wide open. Generally Linear supplies have less noise where switching supplies have switching noise but linear supplies consume more power create more heat and are not thought of as ECO friendly. |
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| Author: | remington [ 28 Mar 2012, 23:59 ] |
| Post subject: | Re: R7G reading P5 |
So I need to look into the power supply as the culprit . Any suggestions on repair. I'm not suited to do this type of repair work anymore. |
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| Author: | elahrairrah [ 29 Mar 2012, 17:13 ] |
| Post subject: | Re: R7G reading P5 |
remington wrote: So I need to look into the power supply as the culprit . Any suggestions on repair. I'm not suited to do this type of repair work anymore. Might want to try Duncan over at http://www.laserdiscservice.com. He's worked on R7G's before so he'd be able to help. I believe he once told me that the R7G has the same power supply as a D604 so he probably has the part in stock. |
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