![Audio Amplifier Servicing](/img/default-banner.jpg)
- 2 165
- 1 780 506
Audio Amplifier Servicing
United Kingdom
Registrace 6. 01. 2014
Audio Amplifier Servicing
A great knowledge base for anyone interested in servicing and repairing Audio Amplifiers.
A broad range of Amplifiers are shown with new videos being loaded each week.
You can type the make and model of your Amplifier into the search window, so your able to review and select the video and repair description that matches your Amplifier
Questions relating to any aspect of Audio Amplifier Servicing and repair can also be submitted E mail audioamplifierservicing@aol.com, an answer will be provided the same day.
For repair and service enquires for your Amplifier E mail audioamplifierservicing@aol.com
To help support the creation of future content, donations can be made by Paypal to audioamplifierservicing@aol.com
Thank you for viewing my channel.
A great knowledge base for anyone interested in servicing and repairing Audio Amplifiers.
A broad range of Amplifiers are shown with new videos being loaded each week.
You can type the make and model of your Amplifier into the search window, so your able to review and select the video and repair description that matches your Amplifier
Questions relating to any aspect of Audio Amplifier Servicing and repair can also be submitted E mail audioamplifierservicing@aol.com, an answer will be provided the same day.
For repair and service enquires for your Amplifier E mail audioamplifierservicing@aol.com
To help support the creation of future content, donations can be made by Paypal to audioamplifierservicing@aol.com
Thank you for viewing my channel.
Cambridge A1 Version 2 Amplifier Repair (With Audio Tutorial)
Fault
Amplifier Not Powering on.
F2 / F3 Power protection fuses blown, both fuses replaced T4A.
Amplifier tested via the Dim Bulb tester, and the bulb lit brightly.
Visual inspection confirmed failure of U8 Left channel Audio Output IC - TDA1514A.
U8 Replaced fixing the issue.
F1/F2 & F3 Fuse holders replaced due to oxidisation.
User controls and switches cleaned with De-Oxit to ensure noise free operation.
Amplifier fully tested working correctly.
Dim Bulb Tester Circuit
czcams.com/video/8YWqWabXdbo/video.html
Amplifier Not Powering on.
F2 / F3 Power protection fuses blown, both fuses replaced T4A.
Amplifier tested via the Dim Bulb tester, and the bulb lit brightly.
Visual inspection confirmed failure of U8 Left channel Audio Output IC - TDA1514A.
U8 Replaced fixing the issue.
F1/F2 & F3 Fuse holders replaced due to oxidisation.
User controls and switches cleaned with De-Oxit to ensure noise free operation.
Amplifier fully tested working correctly.
Dim Bulb Tester Circuit
czcams.com/video/8YWqWabXdbo/video.html
zhlédnutí: 162
Video
Creek CAS4040 Repair (With Audio Tutorial)
zhlédnutí 150Před 21 dnem
Fault Amplifier not powering up. Rear input protection fuse blown, replacement T2A fuse fitted. Amplifier powered up via the Dim bulb tester. Bulb lit brightly confirming shorted Transformer turns. Replacement Transformer fitted Primary 0-230V Secondary 0- 44V (120VA) fixing the issue. User controls and switches cleaned with De-Oxit to ensure noise free operation. Amplifier fully tested working...
Pioneer A10AE Amplifier Repair (With Audio Tutorial)
zhlédnutí 147Před 21 dnem
Fault 1 Amplifier switching to protection mode. Bias on one channel high and could not be set. Dual package emitter resistor open circuit on one side. Replacement o.22-ohm 5 Wat resistors installed fixing the issue. Fault 2 If the standby / start up circuit board was tapped the Amplifier would switch to protection mode. Surface mount bridge rectifier dry solder joints re-flowed fixing the issue...
Creek CAS4040 Amplifier Repair (With Audio Tutorial)
zhlédnutí 1,8KPřed měsícem
Fault Power input protection fuse blown and right channel no Audio. Initial checks confirmed a previous repair attempt had been made and the right channel output transistors were short circuit and non-matched type had been installed. (Different brands.) Replacement Genuine original Philips devices installed BDT65C & BDT64C Fuse replaced T2 Amp. Additional checks made in the failed channel; no o...
Denon DN A100 Amplifier Repair (With Audio Tutorial)
zhlédnutí 2,1KPřed měsícem
Fault Cross talk and distorted Audio on both channels. Power supply to IC20 Input selection IC checked no issue found. Audio output from IC20 checked, confirming failure of the selection IC. Replacement TC9164CN installed fixing the issue. Bias for each channel set to 10 millivolts. Amplifier fully tested working correctly.
Rotel RA01 Amplifier Repair (With Audio Tutorial)
zhlédnutí 2,2KPřed měsícem
Fault Power supply T5 Amp protection fuses blown. Right channel Audio output transistors short circuit Q620 2SD1047 & Q622 2SB817 transistors replaced with Sanyo Genuine originals. Emitter resistors R630 & R632 0R22 - ohm 2 Watts open circuit, replaced Resistor R626 220- ohm 1/4 Watt burnt out, replaced. Low voltage power supply circuit Zener diodes coated in conductive and corrosive Glue. Glue...
Denon PMA 255UK Repair (With Audio Tutorial)
zhlédnutí 214Před měsícem
Fault Intermittent loss of Audio This issue is common with all Amplifiers that have a relay speaker protection circuit and mechanical input selection. Switching contact become oxidised and resistive over time. Speaker protection relay replaced 24 V DC Coil DP/ST Input selection switch removed from the circuit board taken apart and cleaned with a fibre glass pencil to remove oxidisation. Volume ...
Alesis RA300 Amplifier Repair (With Audio Tutorial)
zhlédnutí 203Před 2 měsíci
Fault Power on LED not illuminating Intermittent loss of Audio and distortion Common age-related issues Power LED on the Display Board open circuit. Blue clear LED 5mm x 2mm Rectangular Type 3V forward voltage installed fixing he issue. Intermittent loss of Audio due to oxidised speaker switching contacts and dirty Volume control potentiometers. Speaker protection relay replaced, 12 V DC Coil D...
Rotel RA820AX Repair (With Audio Tutorial)
zhlédnutí 261Před 2 měsíci
Fault 1 Tone controls not operating correctly, noticeable difference between the left and right channels. Common issue due to oxidised selection switches. Selection switches removed and cleaned with a fibre glass pencil and De-Oxit. Fault 2 Intermittent loss of Audio and distortion on the right channel. The fault was only evident when speakers were connected. Output protection fuses and holders...
Rotel RB970BX MK2 Power Amplifier Repair (With Audio Tutorial)
zhlédnutí 215Před 3 měsíci
Fault No Audio from the right channel. Previous repair work had been undertaken by the owner prior to the Amplifier arriving in the workshop. The following issues were found and corrected. Speaker protection fuse holder only making contact with one end of the fuse. Fuse(s) replaced wrong type installed should be T6.3A. Link connecting the base of Q631 to the rest of circuit not soldered in plac...
Rotel RA-02 Amplifier Repair (With Audio Tutorial)
zhlédnutí 720Před 3 měsíci
Fault 1 Amplifier in protection Mode Right channel failure. Fault 2 Input selection erratic. Fault 3 Brown corrosive / conductive Glue issue. Fault 4 Rear speaker binding posts damaged. Fault 1 Right channel Audio Output Transistors short circuit. Other components checked and found to be defective. Components Replaced Resistors R622 47 Ohm ¼ Watt R628 220 Ohm ¼ Watt R630, R632 0.22 Ohm 3 Watt T...
Marantz PM5005 Amplifier Repair (With Audio Tutorial)
zhlédnutí 449Před 4 měsíci
Fault 1 Cross talk / bleed through from unselected channels. Fault 2 Intermittent loss of Audio output when the Amplifier was powered up. Turning the Amplifier On/Off multiple times would sometimes fix the issue for a short time. Fault 3 Auto standby mode not working, Amplifier should switch to standby after 30 minutes when no signal input is detected. Fault 1 and 2 was due to the failure of th...
Cambridge Azur 640A MK2 Amplifier Repair
zhlédnutí 240Před 4 měsíci
Fault 1 Amplifier tripping the mains RCD protection when the power switch on the back of the Amplifier was switched to on. Power transformer primary checked, short circuit reading milliohms. Replacement Transformer fitted Specifications Dual primary 0- 120 -230 VAC Secondary 32.5-0-32.5 X2 17-0-17 Rating 160VA. Fault 2 Amplifier switching to protection mode volume control turning anticlockwise ...
Teac A-R650 MK2 Repair (Audio Tutorial)
zhlédnutí 162Před 4 měsíci
Fault 1 Amplifier in protection mode power LED flashing RED. Left channel Audio Output transistors short circuit. Sanken Q518 - 2SC3519A & Q520 - 2SA1386A Resistors replaced R533 100 Ohm ¼ W Emitter Resistors R539 / R538 0.22 Ohm 5 W Bias for each channel set to 5 millivolts. Fault 2 Intermittent loss of sound, flexing the Volume Control / Pre-Amp board restore correct operation. Common issue c...
Teac A R650MK2 Amplifier Repair (With Audio Tutorial)
zhlédnutí 214Před 4 měsíci
Fault 1 Amplifier in protection mode, Power LED flashing red. Failure of the left channel. Following components replaced. Sanken Output Transistors Q518 - 2SC3519A & Q520 - 2SA1386A Resistors R535 680 Ohm 1 W R536 470 Ohm 1 W R532 / R533 100 Ohm ¼ W R533 / R538 Ohm ¼ W Bias for each channel set to 5 millivolts. Fault 2 Power switch sticking. Metal mounting plate removed and re-aligned. Fault 3 ...
Teac A R650 MK1 Amplifier Repair (With Audio Tutorial)
zhlédnutí 128Před 4 měsíci
Teac A R650 MK1 Amplifier Repair (With Audio Tutorial)
Kenwood KA-1030 Amplifier Repair (With Audio Tutorial)
zhlédnutí 330Před 4 měsíci
Kenwood KA-1030 Amplifier Repair (With Audio Tutorial)
Denon PMA - 600NE Amplifier Repair (With Audio Tutorial)
zhlédnutí 294Před 4 měsíci
Denon PMA - 600NE Amplifier Repair (With Audio Tutorial)
Cambridge A5 Amplifier Repair (With Audio Tutorial)
zhlédnutí 2,5KPřed 5 měsíci
Cambridge A5 Amplifier Repair (With Audio Tutorial)
Sonos Play 3 Smart Speaker Repair (With Audio Tutorial)
zhlédnutí 262Před 5 měsíci
Sonos Play 3 Smart Speaker Repair (With Audio Tutorial)
Sonos Zone Player ZP100 Repair (With Audio Tutorial)
zhlédnutí 318Před 5 měsíci
Sonos Zone Player ZP100 Repair (With Audio Tutorial)
Yamaha A - S201 Amplifier Repair (With Audio Tutorial)
zhlédnutí 643Před 6 měsíci
Yamaha A - S201 Amplifier Repair (With Audio Tutorial)
Alesis RA500 Amplifier Repair (With Audio Tutorial)
zhlédnutí 323Před 6 měsíci
Alesis RA500 Amplifier Repair (With Audio Tutorial)
Marantz PM6005 Amplifier Repair (With Audio Tutorial)
zhlédnutí 651Před 7 měsíci
Marantz PM6005 Amplifier Repair (With Audio Tutorial)
Denon PMA 510AE Amplifier Repair (With Audio Tutorial)
zhlédnutí 720Před 7 měsíci
Denon PMA 510AE Amplifier Repair (With Audio Tutorial)
Cambridge Azur 640A Version 1 Amplifier Repair (With Audio Tutorial)
zhlédnutí 529Před 7 měsíci
Cambridge Azur 640A Version 1 Amplifier Repair (With Audio Tutorial)
Alesis RA150 Amplifier Repair (With Audio Tutorial)
zhlédnutí 461Před 7 měsíci
Alesis RA150 Amplifier Repair (With Audio Tutorial)
QTX Pro240 Amplifier Repair (With Audio Tutorial)
zhlédnutí 340Před 7 měsíci
QTX Pro240 Amplifier Repair (With Audio Tutorial)
Bowers & Wilkins Zeppelin Speaker Repair (With Audio Tutorial)
zhlédnutí 1,6KPřed 8 měsíci
Bowers & Wilkins Zeppelin Speaker Repair (With Audio Tutorial)
Arcam Alpha 8R Repair (With Audio Tutorial)
zhlédnutí 568Před 8 měsíci
Arcam Alpha 8R Repair (With Audio Tutorial)
Have You got some good quality picture from phono board soldering and component side?
Hi I do not have photographs of the Phono board. I can send you the service related documents. Email audioamplifierservicing@aol.com
Does anyone have a good quality picture of the Arcam phono board? Both sides, soldering and the parts side. DIVA A85 DIVA A90 FMJ C31 FMJ AV8 FMJ AV9 FMJ A38
Hi I do not have photographs of the Phono board, I can send you the service related documents. Email audioamplifierservicing@aol.com
@@AudioAmplifierServicingThank's I have service manual, I need picture the pcb layout for cloning.
Which value me does the potentiometer have? I have this exact model sitting on my desk. It was given to me free of charge and the information “does not work anymore, maybe you can repair it- and if not, just toss it”. Turns out the potentiometer is in a condition similar to this. It basically sheared off the board, presumably after the unit being dropped. Everything else looks fine.
Hi It's a 50KA Dual potentiometer Knurled shaft (Type 12) .
Thank you for this video! Always good to learn something about servicing audio gear! Often the component will be thrown in the trash when the fix is simple.
@@robertjermantowicz-uw3iw Thank you
good stuff. Im used to the big power amps for PA and Music. 400W @ 8 ohms Stereo type stuff. This is very good though.
Do you have a repair manual for this unit
@richardbraun6011 Hi you can down load from here www.manualslib.com/manual/3457033/Denon-Pma-500ae.html
Hi! I have a similar Amplifier ( I think), RA-931, and for quite a while I've been struggling with my source select switch, which struggles with the right channel. I have to set it in sort of "in between" position to get a clear output. I am an amateur when it comes to electronics, but I thought I might take a stab at it. Have you had experience with this issue before? Is it just dirt that is stopping the rotary switch from working or does it have to be replaced? Thanks in advance!
Hi the switch contacts have become oxidised. It will need to be removed, taken apart and cleaned with a fibre glass pencil.
Nem tudom az a két nagy Tr menyit tudhat, de leírás 2x240wattot ír 8 ohmról. A Vonyx VDA1000 digitális végfok erősítő 2x500W (1 UNIT) Sokkal botrányosabb. Nagy üres doboz, alig van benne valami és inkább 2x50 wattos. Csupán egy nullát hazudtak rá.🤣😂🤣😅
@roguesquadron909 Yes technical specifications provided by some manufacturers can be very misleading.
BTL. IRS20957S
Thanks and God speed sir!
Thank you
stupid vidio
Briefly, which parts had failed? What was the presumed causes and manners of failures?
Hi D30 and D29 Schottky rectifier diodes on the switch mode power supply board checked. D30 found to be short circuit. (IR10 0422L) Both Didoes replaced SB1100 (100V - 1A)
Hi friend, greetings, I would like to ask you how many watts per channel does this amplifier offer? Is it designed only for bass or does it also offer good mid and high frequencies? How many transistors does it have? I have the multi-voltage version. Thanks.
@cesarviloriacarrascal455 Hi the service manual can be down loaded from here www.manualslib.com/manual/1066900/Pioneer-A-107.html It offers good mid and high frequencies as well as Bass. The transistors are detailed in the service manual.
Thaks my friends, greetings.
Will you recomend this Monacor Sa-50 as the smal amplifier for home using, or is it something better at similar size and functions? What is the sound quality? Maybe there's good option to improve it in some way?
Monacor also produce the SA100 www.monacor.com/products/pa-technology/amplifiers/hi-fi-amplifiers/ It's a good entry level Amplifier
@@AudioAmplifierServicing The differences beetwen SA-50 and SA-100 are only in power, or there is noticeable sound quality effect on SA-100?
@@franciszekciszewski2743 Only power output is different
@@AudioAmplifierServicing Thank you very much, and another question about SA-50. Maybe there's good idea to change preamp on the NE5532 ?
Hi, Where can I source these speaker protection relays in the UK?
Hi uk.farnell.com/schrack-te-connectivity/6-1415546-5/power-relay-dpdt-24vdc-8a-tht/dp/3792630?gross_price=true&srsltid=AfmBOoqTqtd6H-fv2EXn98DQh6Jcgo7v9HhXBXETNvH0hBmpVW06iQdy06w
@@AudioAmplifierServicing Many thanks - You are awesome!
@@AudioAmplifierServicing Purchased these relays but now I have removed the old ones I notice they were double pole single throw whereas the replacements you recommended are double pole double throw - Is this correct and you just cut of the unwanted terminals or is this an error?
Interesting that you say the Onsemi devices do not work - they took over Sanyo, so you'd think they'd be the same! I've often found Rotel amps are a bit "on the edge" regarding stability... so it's no surprise that a slight change in the output device characteristics would make it oscillate. Another thing I often do with these amps is replace the bridge rectifier with a higher current part. They often used 4A rated bridges and sometimes the bridges fail if the amplifier is run hard. Similarly, the pass transistors used for the low voltage supplies often run too hot due to their TO-92 package size, and I substitute them for something in TO-126 - BD139/140 work well enough
Thank you for sharing your experience on the channel
Another very informative vid, thanks! Peter
Oh wow! Is that a single rail, quasi comp? Certainly looks like it with those coupling caps next to outputs. Pretty unique.
Hi you review the Amplifier schematic in this tutorial czcams.com/video/4VL6y4HYRws/video.htmlsi=1JDmMfVeEnwoAhA8
@@AudioAmplifierServicing Great, thank you! Discovered you recently and wanted to thank you, great for beginners, albeit still useful for tried and tested techs. Cannot give enough credit for the time and effort it takes to upload a single vid. Not to mention fixing the damn thing. Much, much appreciated.
@@paulb4661 Paul Wow thank you for the feedback very much appreciated
Neat way to do instructional videos. Thanks. I have an r-s202 with an obviously burnt q108 (2sd2704 smd). Everything else looks good. What are the chances that if i replace it the unit will work again? Thanks again.
Hi if Q108 has burnt out then excess current has been drawn through the device due to the transistor going short circuit. It's important check the other components associated with that part of the circuitry resistors and other transistors. Q108 is in the pre driver stage so check the output transistors and driver section. The service manual can be down loaded and will show the circuit so you can identify what to check.
old gold lives to fight another day 😃
It needs a 3 year warranty. These amps are the pro audio equivalent of an Amstrad amplifier.
@subculture-records It does come with a 3 year non transferable warranty, but it seems the Amplifiers fail just outside the warranty period. .
Always amazes me that the circuit design is the same as a 1980s Rotel RA-820BX3 . And apart from a few minor tweaks and rebadging the design never really changed in over 2 decades. In fact some of the earlier iterations had Black Gate Caps fitted as standard and IMHO sounded better.
Very good sum up of common faults. I would add replacing the two xhong filter capacitors as they loose value (go high ESR) with std. Nichicon 50V 12mfd or CDO 63V 12mfd (same size).
I dearly wanted to own one of these amps years ago. Thanks for sharing your repair work.
Your welcome
I had the 4140S2. A hell of a little amp. Supremely musical & toe tapping. Better than the popular Naim nait & nait 2.
old gold lives to fight another day 😃 i am still using a pma 250 mk3 because i just love its old school design and engineering, hell it aint even got standby mode 😄
Mouser/FedEx are in a different league, remember placing an order Sunday evening and having it on my London doorstep Wednesday morning. Try that with "local" suppliers, especially those relying on Royal Fail.
Thanks for listing the issues in the description! My NAD C320 Seems to be having a similar issue with the AUX relay. So I am going to replace it. I restore vintage electronics so I will be fine. But just though I'd google my problem befor I jumped in.
Very good, if you need further assistance email audioamplifierservicing@aol.com
@@AudioAmplifierServicing Thank so much! I will pop you an email when I get steered on it and if I get stuck.
Great tutorial Gary. Thx for sharing!! 😊
Hi informative, I am working on a c372. From NAD the advice was to change the 80v 10.000 uf in 100v 10.000 uf. My question is if I put 6x 100v 10.000uf in which part i have to adjust for this extra ask of the system?
Hi uprating the capacitors to 100V will not fundamentally change anything as the value of the capacitors remain unchanged. But I would advise completing the alignment procedure for the Amplifier after any form of repair work as components drift and tolerances changed.
What are your recommendations for cleaning speaker relays ?
Hi you need to use a contact cleaner and a fiber glass pencil to clean the switching contacts. www.amazon.co.uk/Modelcraft-PBU1019-1-Glass-Pencil/dp/B002Z8IX36/ref=asc_df_B002Z8IX36/?tag=googshopuk-21&linkCode=df0&hvadid=696285193871&hvpos=&hvnetw=g&hvrand=12870113254195791277&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=1007249&hvtargid=pla-2281435177858&psc=1&mcid=edaceba400a5399f923d3f31bda8d947&hvocijid=12870113254195791277-B002Z8IX36-&hvexpln=74&gad_source=1 Do not use any abrasive for example sand paper or a file. If the oxidisation is ver bad the the relay will need to be replaced.
Hi thanks for the great video. My PM7200 does power up anymore. I push the on/off button but it’s completely dead. Power light doesn’t come on. There is voltage going into the power board. Fuses are not blown. But there is already no power at the main transformer. Any advice? Thanks!
@NewYork-zg9iu The start up relay 5202 should energise providing power to the power transformer. Check if you have the 5.6 volt start up voltage, on the output of regulator 7302. The model of Amplifier develops a of dry solder joints on all circuit boards so depending on what you find bad solder joints should be reflowed.
@@AudioAmplifierServicing thank you so much for the advice! Will try it.
@@NewYork-zg9iu Take your time to clean the contacts and lightly brush the contacts with the fibre glass pencil. You can also spray the contact cleaner onto an absorbent cloth and draw across the contacts. It import not to bend the contacts when cleaning. Also use eye protection when using the fibre glass pencil to avoid fibers flicking into your eyes.
@@AudioAmplifierServicing the output of the regulator is only about 250 mV. Solder joints look optically good. Could it be a capacitor or transistors in the regulator circuit?
@@NewYork-zg9iu Hi check if you have DC Voltage on either side of resistor 3207 1 ohm the voltage regulator input should be 13.3 volts. R3207 may be open circuit or the start up transformer thermal protection fuse may have failed you should have AC volts on the output pins of the transformer 5205
Bạn có thể chia sẽ mình cách vào xem sơ đồ được không .máy pm7200
Yes email audioamplifierservicing@aol.com
I picked up one of these Delta 90's at the carboot yesterday. As ever got it home only to find it lit up but absolutely no output. Would you undertake it's repair for me?
Hi if your in the UK email audioamplifierservicing@aol.com
Trying to fix one of these for someone. Power supply seems ok but how many voltages should it create? I have 24V I think it was. Thinking to remove amp section and replace with a 3 chan bluetooth amplifier with sub out and 2x 50W to the main. A bit over powered but it can run from the original PSU (just). I was going to suggest this to the owner and velcro it on the top / back because starting to get difficult. Looks like someone tried to replace some smd caps. can't see much else, no schematics!
Hi yes schematics makes it hard going to do modifications or repairs. I cannot advise further about the power supply voltages.
I have a Technics model SU-X911 stereo integrated amplifier as part of a stack system - it's been together since new in 1989. Recently the amp won't power up. I un plugged it and re plugged turn on it was fine. The next day the same thing, only unplugging it did not work. I fiddled a bit with the wires and came back to life. Now today it's done it again, was working for a few hours left it for an hour came back wont power up? This time nothing I try seems to bring it back to life?
Hi, Are you located in the UK, I can repair and service your Amplifier email audioamplifierservicing@aol.com
@@AudioAmplifierServicing I've just sent you an email.
Hi What brand of output transistors are a good replacement? Or what is the factory fitted brand? Thanks
Hi 2SB817 & 2SD1047 Sanyo genuine originals.
@@AudioAmplifierServicing yeh thought as much. Looks like i’ll wait until I have a list of parts for my other amps just to meet the minimum order amount from some of these companies. Thanks mate.
I have a few analogue issues V minor tape repairs Nice double deck Technics 1997 mint and a budget Nak with a minor fix needed.Anyone? And a Goldring Lenco GL 75 idler wheel model around 1971.All original needs very minor attention. Any ideas?
Hi not sure what you're asking, are requesting repair support?
@@AudioAmplifierServicing Yes
@@graemeyetts3465 The channel i for the repair and servicing of Audio Amplifiers?
I had one from new 1989. Gave it away, near mint. I have 3 other Arcam amps, baby,Junior and digital 80-150 W one beast. Great amps Warmish sound but with tone defeat too. Build quality Facilities Reliable SA CD Player/streamer also great. Remote control poor. Great gear and VFM
I had an intermittent problem of one speaker channel dropping out. Then fuses F901 and F902 blew. I replaced these and switched on with nothing except power connected at the back. Resistor R626 immediately fried. Transistor Q620 looks to have failed...getting 3.3ohms from between the outer legs but 220ohms on the other three (all in-situ). Is this likely to be the cause or a symptom of something else? Should I replace all the small rectangular transistors on that channel too as you say? If I end up replacing this with a used amp, maybe 5 to 10 years old, which manufacturers do you consider to be most reliable? Thanks in advance.
Martyn from what your describing it does sound like the output transistors have failed, there may be other components in the failed channel that may also need replacing. With electronics it's if a device will fail it when. That can be due to many factors but also the component fails due to age related to it it's operational life. So I can not say a particular make or model of Amplifier is more or less reliable all have their own issues that develop over time. If your in the UK I can repair and service your Amplifier. If your not then email audioamplifierservicing@aol.com and I can provide guidance on self repair if you have experience and equipment.
@@AudioAmplifierServicing I am in the UK. Can you give me an idea of cost? Thanks
@@martynjohnson235 Hi please email audioamplifierservicing@aol.com
Can you send me a diagram of this amplifier?
@@RonilPaclejan email audioamplifierservicing@aol.com
@@RonilPaclejan email audioamplifierservicing@aol.com
Can you send me a diagram of this amplifier?
Email audioamplifierservicing@aol.com
Can you send me a diagram of this amplifier?
@@RonilPaclejan email audioamplifierservicing@aol.com
Buenas tardes maestro una pregunta es normal que esté prendido y no de auido funcione tocadiscos
No, no es normal, ¿puedes proporcionar más información?
@@AudioAmplifierServicing maestro colocó el tocadisco en el pre Ino suena
@@cejonsalsero1168Hi I still do not understand what your asking or what the issue is
I am from India. Transistors still available sir?
Yes
Hi There Nice video. I wondered if you can help i have a Audiolab 8000A in for repair and i want to check and adjust the Bias level as this veriant i have here has actual pre-set adjustment pots but every manual i find on line talks of having to put resistors into circuit to set up bias i cant find a procedure for this amp with variable pots. Hope you can help Kind regards robert ( Excell Audio Services )
Hi measure the millivoltage across the emitter resistors and adjust to 22 millivolts or 50mA
@@AudioAmplifierServicing Hi there thanks for your reply that is what I have done I thought it would be 22mv but just couldn't get confirmation any where thanks once again amp is now running lovely and cool and cross over distortion is ok..Best regards Robert.
Hi - how can I reach you directly need some help with my c352 amp
As detailed in the video email audioamplifierservicing@aol.com
Niceee
Thank you, nice guide Gary 😊
What did this repair cost? I have the exact same symptoms. Definitely intermittent, as I tested outputs from CD and cassette tape players with no issue. Thought it was the turntable. Replaced it yestetday. Enjoyed listening to three records. Put one on this evening and left channel dead--only this time it was dead for all devices. Given that this unit is about six years oldb
Hi the written repair description for video details the part number for the potentiometer, you should be able to source it. If your in the UK I can of course repair you Amplifier email audioamplifierservicing@aol.com
Spent ages on this amp. Had one of the mosfets in the power amp leaky. Replaced, still goes into prection mode. Once channel I see PWM waveform, other channel no. I guess the controller chips have been damaged? Other cold checks seem okay.
Yes, it does look like the controller chip is damaged