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Old 23rd Sep 2023, 8:48 pm   #1
Join Date: Aug 2022
Location: Stockton-on-Tees, Cleveland, UK.
Posts: 39
Default Pioneer CLD-D515 Laserdisc Player Repair - No Power

Hi all,

I have a Pioneer CLD-D515 laserdisc player in for repair at the moment, and I could use some advice with it, please.

The unit doesn't seem to power on - the standby LED seems to light up, but the unit doesn't respond to the power button on the front panel or the IR remote.

I suspect that this is a PSU problem - please see images below.
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I've replaced the 1uF 400V electrolytic at C12 as this is apparently a common problem, and it was completely baked out, but even with a new part fitted the unit is still giving the same symptoms.
It does now give a high-pitched noise from the PSU when mains is applied, which may mean that something is being overloaded.

Does anyone have any advice as to fault-finding these types of PSU (which also seem to be used on the CLD-S310/15), please, such as common failures and how to test all of the output voltages?

The service manual is available here, including PSU schematics:

Many thanks,

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Old 25th Sep 2023, 10:50 am   #2
G6ONEDave's Avatar
Join Date: Dec 2019
Location: Owston Ferry, North Lincolnshire, UK.
Posts: 1,670
Default Re: Pioneer CLD-D515 Laserdisc Player Repair - No Power

Have you checked that R4, R5 and R6 have not gone high resistance, also the diode that feeds into this section?

Quote "All is hyperthetical, until it isn't!" (President Laura Roslin, Battlestar Galactica)
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Old 25th Sep 2023, 5:00 pm   #3
Join Date: Aug 2023
Location: Leicester, Leicestershire, UK.
Posts: 21
Default Re: Pioneer CLD-D515 Laserdisc Player Repair - No Power

ONLY If you feel safe to..

this is what I did on my Sony dead PSU for my MDP-850D

Place it solder side up, and plug it in for a few seconds - obviously beware of it being LIVE HIGH VOLTAGE!

CAREFULLY, check DC voltage on the large electrolytic - C11 - if high - at least 240v DC, then primary side of the PSU should be ok -but BEWARE - that cap is now DANGEROUS!

IF the cap has little voltage, (as it was on my PSU), I checked what was coming out and going into the Bridge Rectifier.
I only had 15v AC going in.
So I knew that the primary was at fault.
I could not find a schematic for my PSU, but I spotted that the voltage drop was after `something` - I cant remember what I did, but I changed that component, and the PSU is now working.
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