Revox B225 problem - diyAudio
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Old 8th September 2012, 09:35 PM   #1
fandik is offline fandik  United States
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Default Revox B225 problem

Hi to all!
I recently bought B225 in non-working condition, after re-caping it (about 90% of caps, didn't touch big aluminum PS ones and few others) one problem remains - when switching tracks track number and time indicator go "nuts" flashing different numbers for about less than a second and then it starts playing next track and shows correct track number.
I should add than track number goes between 3 and 4 back and forth if you're switching from track 3 to track 4 and time indicator flashing random numbers.
I did not test it extensively, but other than that it seems to be playing good, starts playing disk pretty fast without hesitation.
Any ideas would be appreciated.
Leo
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Old 8th September 2012, 10:30 PM   #2
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The large supply caps in these are actually the most likely to be dying. Odds are fairly good that replacing these will correct the faults.
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Old 9th September 2012, 12:35 AM   #3
fandik is offline fandik  United States
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ESR cap meter shows they're still OK, so where about half others that I've replaced.
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Old 9th September 2012, 01:15 AM   #4
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You can't entirely trust an ESR meter. If it's old & european & electrolytic, it needs to be replaced. Seriously.
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Old 9th September 2012, 01:45 AM   #5
fandik is offline fandik  United States
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Thanks for the tip,
I'll replace them and will post the result
L
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Old 10th September 2012, 10:26 AM   #6
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at the servoboard you will find several non polar axial foil caps (looks like axial electrolytics at first look).
Replace this caps additional.
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Old 10th September 2012, 03:11 PM   #7
fandik is offline fandik  United States
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Thanks, I'll try to find them in schematic to see which ones you're talking about
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Old 10th September 2012, 07:26 PM   #8
fandik is offline fandik  United States
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While waiting for PS caps to arrive, just tried replacing these foil caps on Servo 2 board. Unfortunately, no improvements. (danke tiefbassuebertr anyway)
Few more things to add (maybe it will give someone additional clues where to point) - problem is visible only when you switch tracks manually (press play/next button), so laser has to refocus and search for the next track. If it plays normally and upon finishing track goes to the next, it switches instantly and clean.
During this "jittery"search for the next track, laser/focus is pretty noisy. It sounds like problem is somewhere in focus circuitry, but unfortunately my CD players theory knowledge is limited.
Thanks again for your ideas
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Old 13th September 2012, 07:07 PM   #9
fandik is offline fandik  United States
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No, after replacement of big PS caps and 5x33uf caps in laser drawer, still no improvement.
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Old 13th September 2012, 09:19 PM   #10
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Did you try to clean the lens with alcohol?
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