I'm Chas Large, a retired electronics engineer. I've been involved in electronics repairs since before leaving school and have helped and taught many other engineers during my long career. I love fixing stuff, Radios, Computers or basically anything electronic.
Ah well that's where my 50+ years of experience (and quite a few belts) have taught me to be careful where I put my hands and know what not to touch. I'm so glad folk have the sense to leave repairs like this to us professionals.
Thanks, glad to be getting back to doing fixes. Working on another CUB monitor, seems I've become the go-to guy to get these up and running again. Vid coming soon.
I have the Bose wave music system IV and everytime i try to insert a disc it says it's inable to read that disc, i tried multiple, same scenario, the models 417788-wms, i am thinking of cleaning the lens by watching your video on the weekend, hope it fixes it! I also don't have the controller (i found this bose for $10 CAD at a thrift store)
Good catch, remote controllers are around or you can use a one-for-all type, they work well. Cleaning the optics with an aeroduster can often fix it. Good luck. New videos coming soon.
I have this exact same model, colour, with a dodgy volume switch. Hoping a bit of spray will sort that out (it spent a couple of years in sticky Singapore, plus being transported back in a humid container). So helpful to see how to dismantle it properly - thanks so much, and how to clean it. I am also very jealous of your work station!
There's nothing in the manual relating to this error message, It usually refers to the type of disc inserted that cannot be read by the device. The manual says it supports these formats: BD-Video, BD 3D DVD-Video, DVD+R/+RW, DVD-R/-RW, DVD+R/-R DL (Dual Layer) VCD/SVCD Audio CD, CD-R/CD-RW, MP3 media, WMA Media , JPEG Files DivX (Ultra)/DivX Plus HD media, MKV media Maybe the disc you inserted is damaged or not one for the country you're in.?
I am watching this video for a second time and, let me say, it was worth. This man does a fantastic trouble shooting. My Deck # 2 door is not opening. I found the problem is in that sprocket gear covered by the printed board at the back of the mechanism. If I turn that gear with my finger, the door will open. I didn't see how to remove the printed board. How can that board be removed ?
I didn't have to remove the boards in the one I repaired so I would suggest making a drawing of the board and things connected to it and the screws, then undo things bit by bit. you have to unsolder the motor connections. Have a look at the manual, Page 12 Ref 11 and you'll see the procedure.
Miracle! Same model, CD not reading. Cleaned lens--no response. Optical assembly moving and tracking but no observed laser output. Decision: Scrap as beyond economic repair (even at £5 for a replacement not worth the time for a machine with a resale value around £10-15). Revised option: blow some air. Result: working perfectly. Now I suppose I'll need to reconsider the other dozen machines in the junk pile. . . Even after over 40 years in electronic maintenance (albeit not in consumer equipment) there are still lessons to be learnt!
Hi , i have Pioneer SX 434 but the "stereo" light bulb doesn't work. The light bulb is not faulty. I don't hear stereo sound but mono in FM. It could be HA1156 ? what do you say? Thank you. Sam
It is possible, have you checked the working voltages? Do you get a strong signal on the meter for an FM stereo station? I would be inclined to check the primary rf amplifier transistors like the one I found in the video, they can go low gain.
Sorry to hear yours was damaged, sometimes spending more time examining before diving in can be fruitful. Yes, I probably did check the cable but didn't video it?
Dear Sir, Thank you very much for this tutorial. It is extremely helpful. I have the exact same problem. However, when I opened the inside, I realised that one of the two sockets connected to the CD unit is directly soldered to the circuit board (at 14:51 in the video). How is such a thing possible, and do I have to cut the wire completely and solder a new socket to be able to use it after changing the unit?
I cannot say I've ever come across one of these Philips units with the ribbon cable soldered onto the PCB for the laser but that does not mean it's not true. Much older CD optical blocks did use ribbons that were soldered at least one end, the other should terminate in a Plug or ZIF connector. The service manual should show an exploded view with the connectors and the part number for the block could be searched for which will result in the correct item.
Hi, thanks for the kind thoughts, family illness has kept me away from the bench and then I caught Covid too which thankfully I'm now over. Jobs are piling up so more videos to come soon. Cheers Chas.
I think you've persuaded me that these newer all-in-ones are more trouble than they're worth. I like fixing stuff but I lack the patience (and arguably the expertise - that would have taken me quite a while to work out if at all!) to be bothered with that, for what is a modern device with all the inferior Chinesium goodness that implies. I admire anyone who gets the job done though!
Thanks for the compliment, I love doing repairs, ever since I was at school, it was a career I thought would last a lifetime but sadly, the newer cheaper stuff made doing repairs uneconomical and they are not really worth doing them, so I concentrate on older stack systems.
My philips dvd750vr dvd vcr combo turns off with display showing err 1 when i turn it back on it spits the tape out, I've already cleaned the mode switch
Sometimes you need to keep the top cover on as too much light can confuse the optical sensors. Usually, tapes being ejected is a symptom of Head or Capstan Rotation errors. Do they turn? What happens if you manually load the carriage without a tape in, i.e., holding the flap latches and moving the carrier forward.
I have a BBC model B and I'm looking for a Cub montior takes me straight back to school days! I'm a bit apprehensive about getting one as I have no knowledge of how to fix them.
I would recommend trying to find one that has been refurbished and recapped, repairs are only easy for someone who has the knowledge of the circuitry and is aware of the dangers involved in working with mains operated equipment. Not just mains voltages but EHT voltages. You might be better off using a video to VGA adaptor with the BBC and a modern monitor. They are cheap and readily available. If you do buy a CUBBY and need it repaired feel free to get in touch. 😊😊
Thanks for this. I had the same error on my Fein Multimaster and this helped enormously. I added a heat shrink sleeve under the rubber cable sleeve when reassembling as it’s not a good fit. Adding the extra sleeve makes the rubber sleeve fit much tighter and no wiggle room (wiggle probably caused the cable problem in the first place).
I would update the bios using a cpu that did work and ram that did work. go into the bios with gfx card connected, then proceeed to go to internal devices and find the output and instead of it being on auto or pcie change it to inbuilt.
Good Evening My Dad has a RCD M38 DAB Receiver He cannot pre set the channels could you please let me know if this receiver has n internal battery that would hold this information and it’s failed. I followed your channel to him. I would be grateful of any help. Many thanks Susan Morrell.
There is no backup battery in this unit, the channels - all settings in fact - are stored in an Electronically Erasable Programmable Read Only Memory (EEPROM) Integrated Circuit. I would suspect that the system has developed an error. The only way to clear this memory error is to unplug the unit from the mains for 1 hour then plug it back in and it should go into auto tune mode, once that is complete, you should be able to manually tune it in.
@@ChasLarge I'd try different RAM or at least try with each stick in turn. There's usually a particular DIMM socket that needs to be populated for POST in a one DIMM configuration. Did you send the memory back to CCL too?
@@sdecks8078 it wasn’t when I started recording but noticed that before powering on and plugged it in. I did check what would happen if it wasn’t plugged in and you get no beeps and the cpu fan does not start. Not surprising, no power, no cpu operation.
I agree and so does Gigabyte but CCL says this is normal. Others have reported the same issue with Gigabyte MOBOs and some have said it could be caused by the monitor cable not sending a signal back to the CPU. Having tried three more graphics cards since this video was made and multiple cables - Display Port, DVI, HDMI and VGA, and still not seeing a Boot logo or prompt for BIOS entry, I have to say I agree, the CPU is faulty.
I've got an older monitor that had a similar problem when used with integrated graphics. It never detected the signal. I ended up having to install a separate graphics card.
The Intel Core i5 12400F Alder Lake-S CPU has an F at the end of the number which means there is no integrated graphics in the CPU, hence the testing with PCI Graphics cards.
Thank you!! You've done me good. - Good CD's would skip and not even play. Now, after following your methodology. It works just fine. Thank you, Chas!!
My CD was playing. It stopped. A message appeared on screen saying CD inoperable. I took CD out, cleaned it, retried . Didn’t work, tried another several CD’s , again does not work. I have a Wave Sound Touch Model # 412534 with a Sound Touch pedestal
Hi, Chas I have the same model cd player the lens is still intact it tries to load disks, but there is no spinning so moves on to next disk until it goes through all six then stops. I have no idea what is going wrong it's just frustrating.
If the disc does not spin, it's not achieving focus. Either the lens is dirty or damaged, the laser is low or faulty. Replacing the optical block is the only way to prove it.
Just realised that I had disks wrong way up instead of upside down, tried again turning disks around & is working now. 😉 was purchased at a charity shop so had no idea which way disks went, appreciate your reply though so thanx.
Hey Chas, watching this video helped me fix my JVC DR-E300L and JVC AL-E300 turntable! However i think i need to replace the needle, where can i buy a replacement and is it easy to replace? i’ve never replaced one before
Hey Chloe, glad to have helped. Could not find a direct replacement stylus, but a search of e-bay found a lot of similar styli. They are simply push to fit, so you should find a replacement here: www.ebay.co.uk/sch/i.html?_nkw=Jvc%20Al-e300%20Stylus&norover=1&mkevt=1&mkrid=710-154084-101958-4&mkcid=2&mkscid=102&keyword=jvc%20al-e300%20stylus&crlp=533918467341_&MT_ID=&geo_id=&rlsatarget=kwd-505758964494&adpos=&device=c&mktype=&loc=1006630&poi=&abcId=&cmpgn=13822180255&sitelnk=&adgroupid=123999031185&network=g&matchtype=b&gad_source=1&gclid=CjwKCAjwyJqzBhBaEiwAWDRJVN9LpQDk_zc4iP6nXs80EJvexDUKtv5TIv1rxFlUl4kI50n6bWdBPxoCMTsQAvD_BwE If not, contact JVC support, details will be in your user manual.
@@chloebishop-wg8mo Have you checked that the turntable wires are plugged into the PHONO sockets on the main unit? If plugged into the CD or AUX inputs the output will be low. Also check that none of the wires have become disconnected on the back of the cartridge, there should be 4.
Not sure if you cover this later in the video as im only ten mins in at the moment. My TC-K415 fades away treble from around 1 second after press play. First second sounds lovely then fades. I suspect belts as i dont think they have been changed and it struggles a bit on fast forward. Also my deck never registers chrome tapes, just indicates type I. Any ideas for that? I have ordered new belts so will fit along to this video when they arrive. Thank you for the upload
Fading audio is usually down to capacitors failing. I would clean the lever switches that contact the back edge of the cassette, they sometimes become tarnished. They can also be bent slightly out of position, compare them to each other for the same physical position.
Hi! Thanks for the video. I opend a philips blue ray play with similar looking curcuit boards inside and when I was not attentive for a short moment and turned it upside down, a small square brown plastic card with a circular hole in the center fell out. Does anyone have a clue what this might be, where it might belong and wether it's important? Before opnening it did not sound like it had loose parts in it and functionality seems to be good as well. I wonder wether it might be for insulation?
Hi, this is derived from the USB 5v line which is created from the DC 9V rail by IC43 (NR111E) on the USB to DC board. Page 52 of the service manual. Check for shorted connector pins on the USB socket.
It could be the elastomer contact strip along the edge of the LCD. Remove the display and gently remove the elastomer strip. Clean that and the edge of the display with a soft pencil eraser, reassemble and test.
