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Old 23rd April 2013, 03:07 PM   #191
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I found with my CDP XA7ES the following:
If the ripple on main cap of the display Power supply is above ~ 5Vpp the player starts to click on the analog output, without leaving a trace on the eye pattern! I attached the display power supply (VFD supply) of the cdpx5000 and CDP XA7ES. For the cdpx5000 R974 (22k) is way to high, as this resistor has to take base current of Q971 and leakage current of C972(22yF) - I tend to call this a design error, in my Sony it is 2.2K. So I recommend to put a 3.3k parallel to R974 and raise the main cap C971 to 680yF. Moreover this cap and the rectifier diodes have a strong impact on sound, so best take a silmic. I would replace the rectifier diodes D971-974 to 1A/100V Schottky diodes - smoother sound for some cents..
Do not ask me why Display current leads to clicking - I do not know, but checked it several times...hope this helps, philipp
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Old 23rd April 2013, 03:15 PM   #192
dacen is offline dacen  Norway
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Hmm, every input is very welcome. Dont hesitate to make a posting. Some times a fault has its mysterious ways.
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Old 23rd April 2013, 03:28 PM   #193
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Very true..I think the multiplexing circuit of the VFD tube leads to a critical noise voltage drop on the shared main ground bus, thus influencing some digital parts..have fun, Philipp
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Old 23rd April 2013, 03:42 PM   #194
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some good infos concerning VFD tubes :
Vacuum Fluorescent Display (VFD)
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Old 23rd April 2013, 03:47 PM   #195
Salar is offline Salar  Germany
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I guess Ill have to wait to October to check this
- my flat (under the roof) alredy reaches about 23 degress celsius whereas is about 18 degrees celsius outside - too warm to provoke clicking...

Last edited by Salar; 23rd April 2013 at 03:54 PM.
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Old 23rd April 2013, 03:55 PM   #196
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sound will improve considerably with schotky diodes and good cap - the 22k will lead to an unstable regulator - it is intended to low pass filter the zener noise but e.g leakage of the 22yF cap will change with aging and : temperature! - so reference voltage for the regulator will change accordingly..
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Old 26th April 2013, 10:19 AM   #197
Salar is offline Salar  Germany
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1000F/63V will work for C971 as well?
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Old 26th April 2013, 12:22 PM   #198
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Yes 1000yF/63V is o.k...in my Sony I first took a 470yF Panasonic FC (clicking disapeared completely) but I disliked the harsh upper midrange , which is typicall for this type..silmics are more pleasing..good luck
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Old 26th April 2013, 04:49 PM   #199
Salar is offline Salar  Germany
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Did replace R974 with 2,2k and C971 with 1000F/63V - and put the player in the fridge (for this purpose, the design comes handy, but dont do this at home, remember moisturization)
No change, It still clicks when being cold. Could be that the warmup/noclick time has become shorter, but I would not bet on this.
Still, thanks a lot!
All the best, Salar
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Old 27th April 2013, 06:37 AM   #200
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Hello Salar, do not give up...
Given the small money necessary I would change the remaining three caps in the VFD PSU (C972/C973/C974) and keep the values as in the circuit diagramm..take a look at the voltages with an oscilloscope and watch out for high ripple..for testing purpose I would shorten the fuese resistor R902..voltage drop across R974 should be less than 0.2V..
good luck...Philipp
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