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Finally, its a winner, thanks to you Martin.
I got the HK2500 tapedeck up and running. Just new belts then OK. Then I tried my testtape in it, and the tape was full of dropouts, and very bad overall.
Then tested a lot of my old tapes and most of them had dropouts.
(Old tapes loose their megnetism)
But found 2 good ones (99 % good) and gave them to B&O 8004.
Holy moses, it worked. ! Both channels, VU, dolby in/out, timerdisplay. All fine.(until now, maybe some details isnt working, but so far so good)
So you were right Martin and I was getting “blind” and forgot the testtape, and only focused on the 8004.
Thanks for keeping your interest and continued help. Very grateful and happy.yes to all.
I will try to find another tape, and also have another tapedeck (working) and will make a new recording on that.Will a bad/very old tape have that performance, sounds OK a short time, then silence. ?
Result of checking the 7 volt. Both L and R were 6,89 Volt and the 14 volt is 13,8 Volt.
So I think thats fine. But again, with 50 hz hum on the tapehead, I get fine signal in both channels as long as I will.
Is it possible to connect a sinus signal from a tonegenerator at the tapehead. (input on playback amplifier)Or do you have any other suggestions I would be happy ?
Thanks again Martin.
No time yet, but will do it soon. Thanks again for fine info,
The Recording is OK. Only one head. Tape is running perfect on head. Only Playback problem..
Hi Martin.
I will check the 7v ref. But Dolby is OFF.
Yes the VU follow the sound.If I gently touch the pins on tapehead, L and R, with my screwdriver I get 50 Hz hum i both.
Very clear, steady and strong signal. No dropout in hum.Thank you. I found the 3300 service manual and the schematic. Almost the same as in CDX 2.
The problem was the (too high) positive voltage to motor. ( LID up.) It was 8 volt.
I could not find any defective components, so I added a 15 ohm in series with the collector on the driver transistor to motor. Now it opens very smoothly.The minus -5 volt was -4,4 v so that worked fine. ( LID down.)
Hi Martin, thank you for answer. (er du ikke dansk, syntes jeg har set Dillen navnet før ?)
I cant see how LID adjustment is possible, the lid switch is mounted with 2 small screws and it have very little tolerance in holes. I have tried to adjust.
Also the LOAD switch is with 2 screws.
I have seen that its possible in a CDX to adjust LOAD and LASER sw.
There is no LASER sw in a CDX 2 and no MAINS sw,
I need the schematic for a CDX 2, have only one for CDX.
In a CDX the LID motor UP/DOWN voltage must bee +5 volt and -5 volt.
But I have +8 volt and – 5 volt so maybe the +8 volt is too high at makes the crack sound ?Mvh Jens
problem solved. By lubricating the belt with a little grease and reduce the friction
it works now. Opens and lid stops at top without crakking.
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