Hello fellow audio enthousiasts.
I managed to pickup a DENON DAP5500 preamp. Beautifully built, and a nice added value for my DENON power amp POA2400.
But I'm going to have some work with it...
First issue with it: Right channel is sometimes out. I think the L/R balance pot has to be cleaned or replaced. This has to be an easy fix for me.
Second issue, one of which my knowledge of digital electronics isn't sufficient to analyse what's wrong.
I hooked it up to my digibox via the optical connection. In first instance there seems to be a "lock" on 48 kHz but then it loses its signal.
There might be an issue with IC508 or IC507.
(Someone spilled some fluid on that board and it's gonna need some cleaning and maybe replacing of the IC's?)
--> I added the service manual as attachment. The IC's I'm talking about are on page 23 - 3E & 3F.
Aside from the spilling on the board. Could these IC's be the cause of losing the lock on the 48kHz? Or might it have something to do with compatibility of modern optical connections with the (older) optical DAC?
Thank you for your feedback! And I will keep you updated.
Gr
Will
I managed to pickup a DENON DAP5500 preamp. Beautifully built, and a nice added value for my DENON power amp POA2400.
But I'm going to have some work with it...
First issue with it: Right channel is sometimes out. I think the L/R balance pot has to be cleaned or replaced. This has to be an easy fix for me.
Second issue, one of which my knowledge of digital electronics isn't sufficient to analyse what's wrong.
I hooked it up to my digibox via the optical connection. In first instance there seems to be a "lock" on 48 kHz but then it loses its signal.
There might be an issue with IC508 or IC507.
(Someone spilled some fluid on that board and it's gonna need some cleaning and maybe replacing of the IC's?)
--> I added the service manual as attachment. The IC's I'm talking about are on page 23 - 3E & 3F.
Aside from the spilling on the board. Could these IC's be the cause of losing the lock on the 48kHz? Or might it have something to do with compatibility of modern optical connections with the (older) optical DAC?
Thank you for your feedback! And I will keep you updated.
Gr
Will
Update: 4hrs of cleaning coke from pcb
Hi Guys
So, the previous owner spilled some coca cola on the amplifier. It was all dried up and sticky. What a disaster! Tried different kind of dessolvants but desinfictant alcohol really did the trick! But what a hell of a job to clean it. Man man. Please check pictures to see the before and after.
Now its okay i guess, later this week i will re assemble it. But I still have two questions.
The toslink port (see pictures) was also covered by coke. Should I desolder it and dip it in a little bath of alcohol. Then afterwards of course a night drying out before soldering it again. Or is the inside of such a tosslink connection too fragile to dip it in alcohol?
The two ic’s, mentioned in my earlier post, were completely covered by coke. Now they’re clean. I think an ic is waterproof? So I suppose there wont be any coke on the inside?
Oh, one more thing. The soldering got a little corroded from the coke. Should i redo them or is this not so important?
Thank you for your reply!
Gr
Will
Hi Guys
So, the previous owner spilled some coca cola on the amplifier. It was all dried up and sticky. What a disaster! Tried different kind of dessolvants but desinfictant alcohol really did the trick! But what a hell of a job to clean it. Man man. Please check pictures to see the before and after.
Now its okay i guess, later this week i will re assemble it. But I still have two questions.
The toslink port (see pictures) was also covered by coke. Should I desolder it and dip it in a little bath of alcohol. Then afterwards of course a night drying out before soldering it again. Or is the inside of such a tosslink connection too fragile to dip it in alcohol?
The two ic’s, mentioned in my earlier post, were completely covered by coke. Now they’re clean. I think an ic is waterproof? So I suppose there wont be any coke on the inside?
Oh, one more thing. The soldering got a little corroded from the coke. Should i redo them or is this not so important?
Thank you for your reply!
Gr
Will
Attachments
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Update: everything cleanded, desoldered the tosslink gate and cleaned it, did some other cleaning, resoldered some connections. And it works like a charm!!
Digital tosslink locks nicely at 48kHz.
Unit sounds much fuller than the pra1500. Bass has more body, higher notes are more full too.
I’m a happy man ☺️
Gr
W
Digital tosslink locks nicely at 48kHz.
Unit sounds much fuller than the pra1500. Bass has more body, higher notes are more full too.
I’m a happy man ☺️
Gr
W
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