Beocord 9000 service manual questions.

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goodrat Posted: Fri, Aug 16 2019 9:04 PM

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Hi All,

Maybe you can help me with this problem if you have time. The following is an excerpt from the service manual for the Beocord 9000. The problem I have is that when doing the procedure the NO STORE light never comes on no matter how R53 is adjusted. Have you ever come across this? Where would you look to solve the problem? Also following is the procedure to adjust the 7 Khz signal. It says to Key in 1x0. Do you know what they mean by the “x”.
 
Thanks for your help.
Chris


Calibration Detector and Oscillator

Detector and 333 Hz Oscillator
Load a tape and activate REC. OPEN
Set the two service plugs 13P31 and 1S1 in service position
Key-in 800 on the control panel.
Activate REC. CAL

Connect a DC voltmeter to the slider on R53 and adjust R53 until a reading of 2.85mv.
Adjust R8 until the NO STORE LED is flickering and then just starts to glow constantly.


7kH Oscillator
Key in 1x0 on the control panel
Activate REC. CAL.
Adjust R18 until the NO STORE LED is flickering and then just dies away.

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Dillen replied on Sat, Aug 17 2019 9:00 AM

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Just a quick note: Beocord 9000 is impossible to adjust without the bottom (metal) plate installed.
Without the bottom plate all rec. calibrations and automatic tape selection is messed up and unstable.

Martin

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goodrat replied on Mon, Aug 19 2019 2:33 PM

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Thanks Martin,

I appreciate your time and help. I didn't have the bottom plate on so I'll give it a try today. If I get results I'll post again. Any other suggestions would of course be greatly appreciated.

Thanks,

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Dillen replied on Mon, Aug 19 2019 2:42 PM

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Well, failing capacitors and OpAmps would come as no surprise.
As would cracked solder joints at cable connectors.

Martin

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goodrat replied on Mon, Aug 19 2019 3:26 PM

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Again thanks for your help Martin.

Unfortunately doing the adjustments with the bottom plate on had no effect. I have replaced many capacitors and opamps already. Would you know which opamps might be responsible for the problem I'm having? Ie which boards etc. I have replaced all opamps on the oscillator board already.

Thanks

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Dillen replied on Mon, Aug 19 2019 3:29 PM

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Bad trimmers could also cause problems.

Sorry, I cannot point to the exact component(s). You will have to measure and diagnose.

Martin