New addition to the family. A Technics M245X DBX cassette deck, also has Dolby B/C. Single capstan, two motor, music search/cueing etc. It was advertised on a classified site for $20. When I organised to buy it was told it was not working. I said I wanted it anyway and the price got lowered to $10. Have always been curious about DBX and how good it works. Its surprising to see the VU meters with a range up to +18 DB, this is to handle the DBX capability.
Got this thing home and it appeared that the Mode belt was slipping therefore preventing engaging of the heads/mode changes. This thing looked a bit crazy in its design mechanically, using 3 belts and a complex gear system with a cam. Was a bit worried about pulling it apart being so complex. I find it strange how this is a two motor deck and it still needs so many belts, also on playback only 1 motor is used, as it relies on a small belt driven clutch pulley to turn the take up reel which then runs off an idler tyre, this is run by the capstan motor. The reel motor which drives ff/rew also acts as a mode switch/cam drive motor via belt. This thing has a huge capstan flywheel, a good sign. Deck was made in may 1983.
I pulled it down and re-surfaced/cleaned the belts as I had no replacements. Re-lubed the capstan shaft, and cam. After re-assembling and much nashing of teeth the cam belt was still slipping, so I gave it a more vigorous sanding and clean to gain enough grip so it would work properly. Heads and pinch roller were cleaned very heavily, they were dirty, then heads demagnetized with a wand. I thought this thing was ready to go, I get it into the lounge room and the auto tape selector was stuck on metal tape type
This was due to 1 small wire harness not connected properly but took me a while to figure out.
The deck came with a Maxell XL-II chrome tape inside it. It was in good condition so I used it to record my first DBX mix tape. Results were excellent! Was pushing the recording level between +12 and +16db, then on playback there was no distortion, and I could not hear any tape hiss, dbx seems to work very well. I don't understand how you can get such a high recording level without distortion.