I am continuing to work on a Nakamichi Dragon ( serial number 21XXX ). The cam motor continues to run while in play forcing it to the most counter clockwise position. The VR 603 play pot does nothing in play mode. The VR 603 and cam pot are good. When I first received it the 1amp fuse was blown. I found a bad 1000uF 16v cap. I recapped the logic assembly board. It powered up and the display and transport worked. Transistors Q516/616 are good. The IC603 opamp which feeds the bases of those transistors is putting out 10.14v at pin 1. I was thinking maybe there is bad logic chip that is causing the malfunction? The cam motor continues to run when it should stop after performing each transport function. In stop mode it the cam motor does stop and allows the arrow mark to line up with pointer while adjusting VR 604.
Good afternoon. I have the same one but one of the motors is failing, the spare part no longer exists, could you tell me the characteristics of the same one so I can find an equivalent one?
I have a Revox B215, and its mechanics are on a completely different level. One motor for each movement, no belts, no idlers, no plastic parts, and no auto-alignment system with performance that drifts over time. I feel like buying a Dragon just to prove my point about a machine made of a thousand plastic parts that everyone places on a golden pedestal.
The most important are 4 0.22uf coupling caps (signal path). 2nd is 4 power filter caps clamped to the sides, these can easily be doubled in capacitance for the same dimensions.
I am getting the exact same reading regardless of which way capacitor is connected. Ive tried three different types of non polar capacitor including one you showed in vodeo I am not getting any difference at all
ended up using the audio amplifier method where you connect it across mic jack then reverse and see what end is loudest when you touch the body of the capacitor. This tells you which side is the foil side. It was very noticeable with volume cranked up while touching capacitor. Maybe I just don't know how to set up the scope properly but it didn't work for me.
That's because your scope is working properly... He must have an open ground if he's getting that much vertical deflection with just an inductive hum from his fingers...
For me, since I don’t have the skills, expertise, or Nak testing tools to repair a Dragon, simple 3 head Sony’s are the best option. They make excellent recordings and you can buy a bunch for the same price as one Dragon.
What do you consider exotic? It’s a cassette deck that automatically adjusts its playback heads, has double locked DD capstans that both switch directions for both sides of the tape, two tape counter mechanisms, and an entire circuit board that runs a little motor that controls the alignment of said heads. I’d say it’s a little more exotic than a plunger solenoid slapping against metal and an Single idler tire running the show in most decks.
Close, it's a front to back angle adjustment. If you imagine the head is pivoting down at the bottom, "height" is the swing back and forth at the top. Azimuth being the angle from the other plane. If you looked at the head from the top height would be moving in and out and azimuth would be twisting it.
@@stackoverflow8260 Yes, and Nak treats it as the "track alignment" point. You can also think of it like a coarse equivalent to azimuth, with the fine adjustment being the azimuth. You have to go back and forth between the two to dial them both in, one affects the other. Funny thing about tape decks is that the result will be the tracks crossing the heads at a slight angle in 2 planes, it's not straight up and down the heads like you'd think.
I reckon : one end of the tone capacitor is connected to ground, usually the back/casing of the potentiometer. You find the "shielding leg" of the capacitor.....THIS is connected to GROUND. 😊
Just before you mentioned the hairline crack, I said to myself - 'there'll be a miniscule crack in the tracks'. Like looking for a needle in a haystack! The best systems are modular design, but I guess we have to pay the extra them.
