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  • Re: BG8000 fuse issues

    Hi ALF, Excellent, you must have a good electronics store near by.. You indicated that you bought the TT for the transformer, is it a 220V 50Hz or a 240V 50Hz model? I'd use the C27 as the ground point , you could clip the com lead onto the light blue jumper lead. Can you re-do your measurements? Regards Lonnie
    Posted to BeoGram (Forum) by Lonnie on Fri, May 5 2017
  • Re: BG8000 fuse issues

    Hi ALF, I'd recommend you cool your jets until you get your anti-static mat. A replacement CPU can be hard to track down. Regards Lonnie
    Posted to BeoGram (Forum) by Lonnie on Thu, May 4 2017
  • Re: BG8000 fuse issues

    Hi ALF, The green wire is grounded to the back right hand corner of the bottom chassis. There is a stud attached to the chassis and a nut screws the green earth wire on this stud. Regards Lonnie
    Posted to BeoGram (Forum) by Lonnie on Thu, May 4 2017
  • Re: BG8000 fuse issues

    Hi ALF, I think you need to explore your measurements. Repeat the measurements you took yesterday which gave +ve voltages are they still +14.3 & +23.6V? Use a different ground position? BTW did the fuse blow or not? If it didn't I'd add back in R75 but leave P6 disconnected and see if it blows the fuse. Regards Lonnie
    Posted to BeoGram (Forum) by Lonnie on Thu, May 4 2017
  • Re: BG8000 fuse issues

    Hi ALF, OK, you have voltage at C27 but in the above post you have indicated an absence of 5 & 15V. Can you measure the voltage at C28? It should be +15V. Can you measure the voltage at the anode of D26? It should be -15V. Can you isolate 0IC1 by lifting R75, adding a new fuse back in and removing connector P6. Measure the voltage at P6/1, it should be 5V. The D20 zener and the F1 fuse are designed to stop anything higher than 6.2V getting to the microcomputer. The fact that the fuse is blowing
    Posted to BeoGram (Forum) by Lonnie on Thu, May 4 2017
  • Re: BG8000 fuse issues

    Hi ALF, I presume it is the fuse on the main board and not the one inside the transformer that you are talking about? Can you confirm that you are using an 800ma 250V quick blow fuse? Does the fuse blow as soon as you switch the deck on or is it at a later stage of operation? With the fuse blow have you checked to confirm that the +/- 15 v power supplies are ok? With the fuse blown are you getting a reasonable voltage at C24 and the ripple looks ok? Have you checked the D20 zener to confirm it is
    Posted to BeoGram (Forum) by Lonnie on Wed, May 3 2017
  • Re: Beomaster 4400 power-amp problems or ?????

    Hi ALF, You may just want to confirm with your multimeter on the output device leads that you have continuity between: Emitter of 0IC100 and Collector of 0IC101 Collector of 0IC102 and Emmitter of 0IC103 and repeat for other channel. That should confirm that you have them wired up correctly. I'd say you may have shorted one or a couple which would allow DC at the speaker which would trigger the fault signal. Best way to check is disconnect the leads and test them. Regards Lonnie
    Posted to The Workbench (Forum) by Lonnie on Tue, Feb 21 2017
  • Re: Beomaster 4400 power-amp problems or ?????

    Hi ALF, I noticed in your picture P1010148 that you may have crossed over the C&E leads from the board to the TIP147 - 0IC202. The manual shows the layout from the bottom view which has ECB from left to right. When you flip it over to get the top view perspective you will have BCE from left to right. You have B going to B, C going to E and E going to C???? You may need to double check this as the manual may be wrong but also the printed boards are often wrong. If the manual is correct then the
    Posted to The Workbench (Forum) by Lonnie on Tue, Feb 21 2017
  • Re: Beogram 4002 . Grain of wheat bulb voltage for RPM indicator

    Hi, From what I can see: On the AC motor version there is 22.8V across the lamp and for the DC motor version it's 21V. The service manual for the Type 5501/5502 AC Motor 4002 calls up the lamp as #61 with part number 8230052 and a description of just Lamp. The service manual for the Type 5514/5515 DC Motor 4002 uses the same part number 8230052 but with a description of Lamp 24V 40 ma. Hope that helps. Regards Lonnie
    Posted to BeoGram (Forum) by Lonnie on Mon, Feb 20 2017
  • Re: 4002 motor not responding??

    Hi ALF, Just a correction on my last post, the bias on the base is relative to the emitter not the collector as I said. In the PNP the base is negative compared to the emitter and for a NPN the base would be positive to the emitter. Regards Lonnie
    Posted to BeoGram (Forum) by Lonnie on Fri, Jul 29 2016
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