![]() These are nice motors and reputedly better than the Sankyo and Mabuchi motors found in other tape decks including Nakamichi of the time. The capstan motor is a Matsushita MMI-6S2LK 2400RPM counterclockwise motor. The third motor drives the two capstan flywheels. ![]() If that belt slips, the mechanism can’t fully engage the heads and pinchroller, and if the electronics don’t detect audio or tape movement the mechanism will shut off to prevent tape damage. If your Denon appears to play but won’t produce sound and stops after a few seconds, that belt is probably slipping. Another actuates the mechanism via a belt, which is the most common cause of faults with these. One drives the reels directly via toothed plastic gears. The head had a bit of wear but nothing of concern. The take-up reels are entirely gear-driven so there are no rubber idlers to perish besides the pinchrollers, which were fine in my unit. It’s quite a nice one, albeit not a patch on Pioneer’s ‘reference master’ or the earlier Denon models with a cassette drawer and cassette stabiliser. The electronics in these machines are quite simple, mainly condensed into integrated circuits with a basic power supply and a smattering of supporting components. I acquired mine for £75 in need of fresh belts, but electrically in working order. Being a 3-head deck you can monitor recordings in realtime as well as via the massive fluorescent display that dominates the front panel.Ī mint DRM-740 untouched (I.E unserviced) will currently set you back around £100. It’s a fairly basic unit with Dolby B and C noise reduction, HX Pro, an MPX filter and a few calibration controls for recording. Produced from 1995 to 1999, the DRM-740 was a 3-head, dual capstan cassette deck near the top of the Denon range and roughly mid market price wise, at a time when the peak of cassette deck manufacture was nearing its end. But to properly execute a closed-loop mechanism added a degree of cost and complexity to the machine.ĭenon’s DRM-740 is one such effort. In theory the system is preferable over a single capstan transport as even tension is maintained even when the tape is stretched or its pressure pad has failed. The tape is then drawn along the tape path from both sides and even head pressure is maintained without the pressure pad playing an integral role. In a so-called ‘closed loop’ system, a second capstan and pinchroller are located to the left of the playback head assembly. A sprung pressure pad in the tape itself maintains pressure against the playback head. ![]() The concept is simple even if the execution is anything but in a common tape mechanism, the tape is pulled across the heads by a single capstan, attached to the flywheel, and a rubber pinchroller beneath. I was recently in the market for a low-cost dual capstan cassette deck to digitise a couple of degraded tapes.
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