I found Michael’s video extremely useful - these additional notes might help others too. My RCD-M41DAB had stopped accepting Bluetooth streams, even though the Bluetooth device connected properly. I tracked the problem to the fact that the device had overheated (June ’23 was v. warm) and the in-built Denon Protection system had restricted various functions. A three stage process cleared this: 1. Unplug the unit. 2. Hold down the ‘Source Button’ and ‘Forward-Skip’ buttons and connect the power lead. This showed ‘PROTECTION: AMP’ 3. Press and hold the ‘Play/Pause’ button for several seconds. This clears the Protection setting. The Bluetooth function now works cleanly.
@henryvillanueva7110 Жыл бұрын
A hairline crack or gap is the most common problem on all circuit boards, I use an incandescent light bulb to shine behind it on the component side while using a magnifying glass to trace the cracks and hairline gaps on the copper tracks.
@michaeldranfield7140 Жыл бұрын
I will try that next time , many thanks .
@allandenman9387 Жыл бұрын
Dear Michael. Many thanks for posting this video. Congratulations on getting it working. These machines and there Ilk are so bad to work on I just no longer look at them. But they do make very good doorstops. We probably have around half a dozen of this type of mini system scattered around our workshop that won't see the light of day again. Kind regards Allan.
@michaeldranfield7140 Жыл бұрын
Got one knocking around but I'm not sure if its a different model and the DAB only tunes in one channel, I replaced the DAB module and its no different so I now suspect data corruption in the Eeprom, just got to wait until another comes in with good DAB so I can read out the contents of the Eeprom .
@OaklynHall Жыл бұрын
Another interesting and educational video - thank you for sharing it with us. I never knew this type of device has an internal "error log", I always learn something every time I watch one of your excellent videos. Well done for spotting the hairline crack in the PCB track.
@michaeldranfield7140 Жыл бұрын
Not just an error log, the service mode tells you what has caused the problem , in this case it was power supply rail out of spec.
@mattsan70 Жыл бұрын
Good job you spotted it - proper rabbit hole chaser that would've been
@techslfink9722 Жыл бұрын
A classic problem that can take hours to spot. Well done!
@michaeldranfield7140 Жыл бұрын
The construction of this unit makes fault finding difficult so this was a good find .
@MrReeceyburger123 Жыл бұрын
Awesome Mike, I’ve had this with an intermittent line filter. It was going on and off, discovered a crack on side of one on the power board same connector.
@michaeldranfield7140 Жыл бұрын
cracks in PCB s were common back in the 80 s but its not something you see very often now .
@Rollin-Rant Жыл бұрын
I've got 4 of these DAB receivers and all working, but thanks for pointing this out 👍
@michaeldranfield7140 Жыл бұрын
I have one with no DAB radio, it only tunes in 1 channel but it could be a different model to this and its not the DAB module , I suspect the Eeprom has data corruption .
@proluxelectronics7419 Жыл бұрын
Removed the comments to the original 500 dash issue, keep up the good work.
@michaeldranfield7140 Жыл бұрын
I removed the comments as I didn't want people asking for the LED part numbers because I cant find LED s of the exact same height, I found some that work and the customer returned to say his display was fine but I would have been much happier fitting an exact replacement instead of some that were 2MM less in height.
@sureshsharma91024 ай бұрын
Great spot!, I am glad you got your unit fixed. I have the same issue "flashing red light" and I currently diagnosing it, Can you please share where you found the service manual for the RCD M41DAB, I can't seem to find it. Thanks. A quick update, I could get may unit to power up and operate only if I short the relay to the main transformer, so I think problem I have is when only the sub transformer is on.
@michaeldranfield71403 ай бұрын
I never pay for service manuals now so it will have either been listed on a free site on the internet or from ASWO , if you send me a message after bank holiday I can have a look if I have a stored copy .
@mistermikeanson Жыл бұрын
Good spot!! I wonder why the track broke? I guess that's why they sometimes put that white gloop on large components to prevent movement and possible damage!
@michaeldranfield7140 Жыл бұрын
I don't know , I wonder if the crack has been there from new and its opened up worse over time .
@shaunmorrissey7313 Жыл бұрын
Well spotted
@michaeldranfield7140 Жыл бұрын
Many thanks .
@wisher21uk Жыл бұрын
Brilliant catch Micheal maybe it’s been dropped ? Nice fix as expected from you thanks
@michaeldranfield7140 Жыл бұрын
may be ,customers never tell you all the story though when they bring stuff in for repair .
@wisher21uk Жыл бұрын
@@michaeldranfield7140 so true Michael, I sold a to once and after 2 days customer said that there are lines on the tv, so I went round and yes there were lines, I said I will have a quick look, the guy kept saying “she wants the money back”, but I thought I’d check it out first, I moved the tv and I noticed a drip of water on the tv unit…. I then felt the bottom of the tv it was wet, under the stand was wet too. That was that I said I’m not touching it as it’s got water in it, the wife said “how do know you have put water in it yourself” yeah like I carry a bag of water around in my pocket just in case, to end the story I just left ☺️
@jurekwalek181916 күн бұрын
Hello, can I ask for a diagram of this amplifier? My equipment is completely dead, only the power supply has 3.3V.
@michaeldranfield714013 күн бұрын
send me an e mail, md@digifixltd.co.uk , and I will see if I can still find it , for some reason though my PC wont let me reply to Gmail addresses .
@user-zh4on7iy6u Жыл бұрын
Hello Michael. Thank you for your RCD-M41DAB video - it's very interesting and informative. My device does not play Bluetooth devices (devices connect OK, but do not play - the Play and Pause icons on the display flash when in Bluetooth mode), and there is a slight speaker 'pop' when the device is powered off. I have a couple of questions: 1. Do you have any insights into "Protection: AMP" message (when pressing "Source" and "Forward Skip" buttons and applying power? 2. Could you let me know where I might obtain the service manual / full circuit diagram that you refer to in your video. Many thanks, Regards /Stewart
@michaeldranfield7140 Жыл бұрын
I just found the service manual on the internet, some places will have it for sale but I just keep searching until I find a free one , I find most audio equipment so complicated and with hidden protection circuits its impossible to repair without a service manual .
@user-zh4on7iy6u Жыл бұрын
@@michaeldranfield7140 Thank you Michael - I will search. I have posted a new Comment, which may be of interest to those accessing your channel, as I fixed my problem.
@DomRivers677 ай бұрын
Did you find the service manual...I have searched high and low and just keep coming up with the owners manual....mine clicks on and immediately off, repeatedly at half second intervals...with a loud relay clack... doesn't have time to respond to button presses...am I doing it right?
@user-zh4on7iy6u7 ай бұрын
@@DomRivers67 Hi, The reset solution fixed my problem that the bluetooth did not connect. I found a source which offered a paid-for service manual, but I could not find a a free copy. Having solved my problem, I didn't search further. Having said that, the unit now gives a slight 'pop' when switched on - but liveable with! Wishing you good luck in solving your problem. Stewart
@whitesapphire5865 Жыл бұрын
This is why I like hot wires and high volts! Valve technology doesn't play tricksy little games last like this. Just out of curiosity, are there any domestic electronic products with, effectively, an OBD port for this kind of diagnostic and fault clearing?
@michaeldranfield7140 Жыл бұрын
A lot of HI /FI now when its dead or stuck in ST/BY and you put it into the service mode will tell you what the problem is and it can save hours of fault finding , a Yamaha amp I did a few months ago not only reported which power supply rail was out of spec but it also reported by what percentage the rail was down by , pity TV sets are not this clever .
@DomRivers677 ай бұрын
My kids had a 16th birthday party and goosed my DM41....it just goes click clack and the red light goes on and off....been played at full volume for a protracted period Transformer?
@michaeldranfield71407 ай бұрын
you will need to get the service manual and put the unit into the service mode to check what has tripped it out , it may well be a transient overload and it just needs the error clearing to reset the unit, there could be no fault.
@DomRivers677 ай бұрын
@@michaeldranfield7140 can I do that?..it doesn't stay on long enough for the display to work, just clicks on/standby/on/standby at roughly half second intervals as soon as powered up.
@DomRivers677 ай бұрын
@@michaeldranfield7140 the black oblong relay sandwiched between the little preamp transformer and the three capacitors just clicks on and off...along with the standby light. :-(
@truthreigns7 Жыл бұрын
Good ole Hawkeye
@michaeldranfield7140 Жыл бұрын
sometimes a visual inspection can be as good as having a service manual !
@brianhindley995110 ай бұрын
Can you repair my denon doing same red light flashing
@michaeldranfield714010 ай бұрын
I can take a look if you want to bring it in .
@brianhindley995110 ай бұрын
@@michaeldranfield7140 thank you , what times are you open
@michaeldranfield714010 ай бұрын
@@brianhindley9951 mon, tues, thurs,friday and saturday, just after 9am till 5pm .
@adamdavies1637 ай бұрын
Hi Michael, I have been looking for copy of the service manual for this model, not been able to find it online. Can I ask where you got your copy please? I have a unit that's dead, flashing it's red light, no display and clicking the main relay. The factory reset etc does not work as the unit does not respond, just carries on flashing and clicking. I am pretty sure it's a mainboard fault as i've tried the board in another good unit. The symptoms went across with the board. It may not be easily repairable, but I did find what appears to be a couple of shorted SM capacitors, so would like to see the diagram in order to work out if that makes any sense or if i've actually hit on the problem. Thanks 🙂
@michaeldranfield71407 ай бұрын
A shorted cap seems a very likely cause of it tripping, I will have a look on Monday to see if I still have the service manual on my pc, contact me again Monday afternoon.
@michaeldranfield71407 ай бұрын
A shorted cap seems a very likely cause of it tripping, I will have a look on Monday to see if I still have the service manual on my pc, contact me again Monday afternoon.
@michaeldranfield71407 ай бұрын
A shorted cap seems a very likely cause of it tripping, I will have a look on Monday to see if I still have the service manual on my pc, contact me again Monday afternoon.
@michaeldranfield71407 ай бұрын
A shorted cap seems a very likely cause of it tripping, I will have a look on Monday to see if I still have the service manual on my pc, contact me again Monday afternoon.
@michaeldranfield71407 ай бұрын
A shorted cap seems a very likely cause of it tripping, I will have a look on Monday to see if I still have the service manual on my pc, contact me again Monday afternoon.
@ralphj4012 Жыл бұрын
Well spotted, the cap pin solder joint also looked dodgy. The apply power technique (4:37) made me laugh, thank the lord for low voltage secondaries. You know I am only joking around.
@monteceitomoocher Жыл бұрын
Well spotted, proving once again that a little luck can trump logic occasionally!.
@michaeldranfield7140 Жыл бұрын
you need luck on something like this where its impossible to measure voltages on the underside of the board .