Posts by Borntomend (archived2)
24 total posts23 results
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · Jun 16, 2020 18:34Thanks for the ‘Hats off’ manfy, i admit to being quite chuffed to have a working 1700. A few beers have met their demise in celebration but I know my efforts have not achieved the quality and attention to detail of enth…
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · Jun 7, 2020 01:33a few more snaps to amuse you all Ok... One channel completely rebuilt / circuit checked and wired up with untested original board containing new parts. Now to start from scratch (again) and follow Manfy's kind instructi…
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · May 30, 2020 14:30Behold a thing of beauty ! 🙂 - brings back happy memories of what my board looked like a few months ago before i started 'repair' Very interested... but have I gotten too deep into the replacement project to afford such…
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · May 27, 2020 18:10Nearly there - in principle! Latest draft of many before soldering components onto vero board: ...might just check the circuit against the manual a few more times tho😁
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · May 19, 2020 21:40[quote user="manfy"] <snip> For offline testing of this new board you can - actually must (!!) - connect those 2 GND points at the amplifier board, but when you connect the preamp, the jumper between power GND and signal…
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · May 19, 2020 11:52[quote user="fkatze"] You are pretty far in now [/quote] Oh yes way in deep over my head <gasp> 😳 I've scanned the PCB layout from the manual received via snail-mail so as to check all tracks against circuit diagram - a…
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · May 18, 2020 16:57Photos below are not for the faint hearted - LOL attempted work-around ruined pcb tracking !!!! After everything...starting from scratch to make one channel of the amp onto double sided vero is the final option feared! O…
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · May 16, 2020 11:19Brilliant ! Thanks manfy. I'll set everything up on Monday as I've promised the wife I'll spend time with her on her weekend off, then I'll be able to take each step you've provided at a dedicated slow pace. Pete PS Mond…
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · May 12, 2020 12:55Thanks for this manfy, I've checked heatsink isolation after putting fresh compound between all the mica/transistors - isolation is good - from everything (-: I also understand your points about GND and separation. All s…
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · May 12, 2020 00:50Thanks manfy, After more than a few days off and a few night dreams about the B&O amp pcb/circuit I've dug out a 40W bulb to wire up in (series?) on the live 240v, yet know not what voltages to test for on the power amp …
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · May 7, 2020 10:48Many thanks for your help.. manfy - ' You measured 45V from speaker output ( before the output cap C108, I hope!?) to GND' I measured it from the end of L100/200 on the 4pin central white connector to the other terminals…
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · May 6, 2020 18:24Thanks Martin The channel that died when the speaker was shorted many years ago is the channel that smokes! I daren't wire up the speakers for the other channel, esp now that i have replaced all its parts too! I didn't k…
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · May 6, 2020 15:03Thanks for the advice on soldering (-: I’ve replaced all Electrolytic Caps/Transistors(+ic’s) and checked all joints and values of all components. Overal the values of each component on left and right channel seem symmet…
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · May 2, 2020 19:54You are so correct! 😳 ..but i will not be beaten (-: I've noted where all the tracks are supposed to be (see diagram with my red line markings) and plan to link all areas where I've previously destroyed them with a too …
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · May 2, 2020 18:35lots of tracking had lifted so had to work out what goes where before putting transistors back. What u see is the board without transistors. Work in progress - sort of 😇
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · May 2, 2020 01:47The enduring learning curve to enthusiastically repair one channel of a shorted Beomaster 1700 amp continues.. Step: 1.Google (other search engines are available) to find similar issues/solutions 2. Find a service manual…
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · Apr 26, 2020 11:39thanks for your reply manfy I'm somewhat confused at the high current at such a low voltage given that the B&O power supply throws out 50v and I also think both channels are now affected after previous tinkering. Origina…
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · Apr 25, 2020 13:11Do you have a DC power supply that goes up to 50V?? ... No I do not but I have a Manson 3-15v supply and connected it up briefly. It drew 4amps at 5Volts ! Needless to say the R221/2 went hot! I suspect I previously kill…
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · Apr 24, 2020 20:58manfy Thank you! Of the two 1k VR's removed; one is fried and the other is reading 1.1k with 0.6K towards R113 0.5k towards R111 so I'll set the values and see what happens, one channel powered up at a time. Below is wha…
Beomaster 1700 (type 1701) revisited - Tech Help needed
in Imported Content (Unmapped) · Apr 24, 2020 17:08Well well well it looks like B&O printed incorrect capacitor polarity markings on this PCB. (c108/208 '5000uf') I took the originals off (4700uf) to replace them and foolishly trusted the markings on the PCB ! I've only …