Beocord 8000 fuse blows (PCB 6)

10 replies
DA
dahiyas
Bronze
186 posts
Posted October 10, 2020 at 04:26 GMT
#2145262

I recently acquired a Beocord 8000. Very clean but didn't play tapes. 

Ordered replacement belts from Martin. The belts had turned to goo.

Still no activity from motor after replacing belts. A quick search on beoworld, pointed me to blown fuse on PCB 6. Replaced the fuse..press play and the fuse blew again.

Cleaned the tape mechanism. Again tried to play and no movement on motor but fuse was ok. Tried moving the shaft by hand..felt vibration in motor and the fuse blew again.

I was getting 14.2v on the small board next to the motor (PCB 12). (before the fuse blew).

Blown motor ? Any chance of fixing the motor ?

Any guidance will be appreciated !!

 

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DI
Dillen
BronzeModeratorFounder
12777 posts
Posted October 10, 2020 at 09:32 GMT
#2145263

Sounds like a bad motor, if you are sure that you are using the correct rating and type of fuse.

Martin

DA
dahiyas
Bronze
186 posts
Posted October 10, 2020 at 17:43 GMT
#2145264
Yes Martin, 200mA slow blow fuse. says that on the PCB.

There is absolutely no movement from the motor. The shaft moves freely by hand.

Any chance that you can provide a replacement motor ?

Thanks !!

My B&O Icons:

BeoCenter-9500.png BeoCenter-9500.png
Beoremote-Beo4.png Beoremote-Beo4.png
Beovox.png Beovox.png
Beovision-11.png Beovision-11.png
Beovision-10.png Beovision-10.png
Beotime.png Beotime.png
Beosound.png Beosound.png
Beosound-Essence.png Beosound-Essence.png
Beosound-9000.png Beosound-9000.png
Beosound-4.png Beosound-4.png
Beoremote-One.png Beoremote-One.png
Beoplay-Beolit17.png Beoplay-Beolit17.png
Beoplay-A9.png Beoplay-A9.png
Beoplay-A8.png Beoplay-A8.png
Beoplay-A2.png Beoplay-A2.png
Beoplay-A1.png Beoplay-A1.png
Beomaster.png Beomaster.png
Beolit.png Beolit.png
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DI
Dillen
BronzeModeratorFounder
12777 posts
Posted October 11, 2020 at 07:29 GMT
#2145265

Good motors are getting rare these days, with all the incorrect belts being sold on Ebay etc., but I will take a look in the dungeons.
PM or email me.

Martin

DA
dahiyas
Bronze
186 posts
Posted October 12, 2020 at 08:25 GMT
#2145266

Done Martin...Thanks !!

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Beovox.png Beovox.png
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Beovision-10.png Beovision-10.png
Beotime.png Beotime.png
Beosound.png Beosound.png
Beosound-Essence.png Beosound-Essence.png
Beosound-9000.png Beosound-9000.png
Beosound-4.png Beosound-4.png
Beoremote-One.png Beoremote-One.png
Beoplay-Beolit17.png Beoplay-Beolit17.png
Beoplay-A9.png Beoplay-A9.png
Beoplay-A8.png Beoplay-A8.png
Beoplay-A2.png Beoplay-A2.png
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DA
dahiyas
Bronze
186 posts
Posted October 22, 2020 at 03:25 GMT
#2145267

Thanks for the motor Martin.

Replaced and the tape mechanism is up and running.

I noticed that the VU Meter does not go beyond -2db.

More troubleshooting for the weekend.

 

 

My B&O Icons:

BeoCenter-9500.png BeoCenter-9500.png
Beoremote-Beo4.png Beoremote-Beo4.png
Beovox.png Beovox.png
Beovision-11.png Beovision-11.png
Beovision-10.png Beovision-10.png
Beotime.png Beotime.png
Beosound.png Beosound.png
Beosound-Essence.png Beosound-Essence.png
Beosound-9000.png Beosound-9000.png
Beosound-4.png Beosound-4.png
Beoremote-One.png Beoremote-One.png
Beoplay-Beolit17.png Beoplay-Beolit17.png
Beoplay-A9.png Beoplay-A9.png
Beoplay-A8.png Beoplay-A8.png
Beoplay-A2.png Beoplay-A2.png
Beoplay-A1.png Beoplay-A1.png
Beomaster.png Beomaster.png
Beolit.png Beolit.png
Beocenter-2.png Beocenter-2.png
DA
dahiyas
Bronze
186 posts
Posted October 28, 2020 at 02:15 GMT
#2145268

So recap/cleaning/lubricating complete.

Only issue is the VU meter. It doesn't go beyond the first 4 bars. When songs are fading in/out the bars increase/decrease normally.

Also am I supposed to see the numbers for the bars ?

My B&O Icons:

BeoCenter-9500.png BeoCenter-9500.png
Beoremote-Beo4.png Beoremote-Beo4.png
Beovox.png Beovox.png
Beovision-11.png Beovision-11.png
Beovision-10.png Beovision-10.png
Beotime.png Beotime.png
Beosound.png Beosound.png
Beosound-Essence.png Beosound-Essence.png
Beosound-9000.png Beosound-9000.png
Beosound-4.png Beosound-4.png
Beoremote-One.png Beoremote-One.png
Beoplay-Beolit17.png Beoplay-Beolit17.png
Beoplay-A9.png Beoplay-A9.png
Beoplay-A8.png Beoplay-A8.png
Beoplay-A2.png Beoplay-A2.png
Beoplay-A1.png Beoplay-A1.png
Beomaster.png Beomaster.png
Beolit.png Beolit.png
Beocenter-2.png Beocenter-2.png
DI
Dillen
BronzeModeratorFounder
12777 posts
Posted October 28, 2020 at 07:14 GMT
#2145269

Yes, the dial should be illuminated. Probably a burned lamp, the lamps tend to break off a lead right where they enter the glass envelope from the vibrations in the deck.
The VU-meter is driven by two ICs. One for the first four bars, and one for the last four bars.
I would look a bit on those ICs (1IC3 1IC4). Are they both powered?

Martin

DA
dahiyas
Bronze
186 posts
Posted October 28, 2020 at 13:47 GMT
#2145270

Thanks for the guidance Martin.

I will look for the lamp. Is this the 6V, 1W lamp on the schematic ?

Yes, I was looking at the schematics last night and all LEDs driven by 1 IC out of the 2 are impacted. I will investigate that later today.

Thanks !!

 

 

My B&O Icons:

BeoCenter-9500.png BeoCenter-9500.png
Beoremote-Beo4.png Beoremote-Beo4.png
Beovox.png Beovox.png
Beovision-11.png Beovision-11.png
Beovision-10.png Beovision-10.png
Beotime.png Beotime.png
Beosound.png Beosound.png
Beosound-Essence.png Beosound-Essence.png
Beosound-9000.png Beosound-9000.png
Beosound-4.png Beosound-4.png
Beoremote-One.png Beoremote-One.png
Beoplay-Beolit17.png Beoplay-Beolit17.png
Beoplay-A9.png Beoplay-A9.png
Beoplay-A8.png Beoplay-A8.png
Beoplay-A2.png Beoplay-A2.png
Beoplay-A1.png Beoplay-A1.png
Beomaster.png Beomaster.png
Beolit.png Beolit.png
Beocenter-2.png Beocenter-2.png
DA
dahiyas
Bronze
186 posts
Posted November 3, 2020 at 05:05 GMT
#2145271

Lamp - Sure enough the lead had broken off right at the glass entry point. Replaced the bulb.

VU Meter - IC3 (LM324) was the culprit. Replaced the same and all is well with the VU meter.

Martin - As always thank you for the guidance !!

My B&O Icons:

BeoCenter-9500.png BeoCenter-9500.png
Beoremote-Beo4.png Beoremote-Beo4.png
Beovox.png Beovox.png
Beovision-11.png Beovision-11.png
Beovision-10.png Beovision-10.png
Beotime.png Beotime.png
Beosound.png Beosound.png
Beosound-Essence.png Beosound-Essence.png
Beosound-9000.png Beosound-9000.png
Beosound-4.png Beosound-4.png
Beoremote-One.png Beoremote-One.png
Beoplay-Beolit17.png Beoplay-Beolit17.png
Beoplay-A9.png Beoplay-A9.png
Beoplay-A8.png Beoplay-A8.png
Beoplay-A2.png Beoplay-A2.png
Beoplay-A1.png Beoplay-A1.png
Beomaster.png Beomaster.png
Beolit.png Beolit.png
Beocenter-2.png Beocenter-2.png
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