kgallen Posted March 20, 2022 Report Share Posted March 20, 2022 @BearBoy and I recently expanded our aged horizons and toyed with Amazon Japan and bought some new (new) MD blanks. Buoyed by that experience I recently decided to go another step and risk my hard earned cash with Ali Express. I do quite a lot of ‘hobby electronics’ but it’s not an online vendor I’ve ever been tempted to try. Expectations were not high. A few weeks back I bought a Sony MXD-D4 (yes guys another one…) from eBay. But this one was listed with MD issues. I can sort that, I thought. Well yet again I bought a thoroughly minging machine. The thing stinks. I think it’s been on 40 a day for the last 20 years. I lifted the lid first and I’m glad I did. The MD overwrite head was folded up like a concertina. No wonder it had C13 reported. Replaced the CD eject belt. CD section works fine now. Took out the MD drive and removed the OWH assembly (pretty straightforward). New load/eject belt as a standard service procedure. MD drive back in the machine and it plays. Result. Steal an OWH from another drive that has issues but OWH is known good. Fit to the D4 drive. Nope still won’t record. Regardless, stripped the whole machine down and gave it a severe dose of isopropyl alcohol and washing up liquid. Damn thing still stinks. Break out the LPM and the Iop jig. Short story is this is the first machine I’ve come across where the laser is genuinely aged. The read laser power can be calibrated ok - hence the machine can indeed play. However the laser power can’t be adjusted for the write power. Even at a crazy 150mA of Iop (bearing in mind the factory cal for the laser is around 56mA), I can’t get more than about 6mW of write power out of it. Thoughts of doing my first laser replacement… Start looking around for a KMS262A laser assembly. Find one on Ali Express and it’s about £55 delivered to the UK, so not cheap and not guaranteed to fix the machine. Browse a bit more. It’s fairly clear some of these sellers have no idea what the stuff is they are selling. Come across some pictures of an MDM-7 drive. Find some additional pictures of the underside showing the BD board with an EMC shield and a fitted 90MHz crystal. So the MXD-D4 can do 4x dubs from its internal CD drive. This means the MD drive is a variant of the MDM-7A drive we find in x40 decks. The drive is an MDM-7X2A and you can spot it as it has this EMC shield and the 90MHz crystal which is not found on the usual ‘single speed’ drives. If you like, this MD drive is like a 4x CD-ROM drive except it’s MD. So back to Ali Express, these pictures are ticking all of the boxes. But is it BS? The seller talks about a laser. The seller talks about CD and BMW cars. If I order one, what the heck am I going to get. Will it look anything like the pictures? Get a rush of blood to the head and shell out £84. In the name of research. There is no way this exercise will cost in… To be continued… Quote Link to comment Share on other sites More sharing options...
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