Those measurements on the LINE OUT (while playing back the recorded signals) are done with unit sitting normal or upside down ? How do they vary...
Means the audio part is fine, problem is either related to bias or the tape path somehow changes when upside down. Next thing to measure is the...
The levels at the output right before the bias trap (pin 16) are almost equal. The 11mV difference represents ~0.18dB, which is insignificant. A...
Those voltages are AC or DC ? We are only interested in the signal inputs and outputs (pins 11, 7, 14 and 16, in this order), can ignore the rest....
The levels I would check at the output of CX174 also, the line out measurements can be unreliable. There is a thread on tapeheads that says what...
Yes, for the most part the 10kHz azimuth and 400Hz Dolby level are enough, given you already have the 3kHz speed/W&F one. For the Dolby level,...
Doesn't seem this unit has a line in, so feeding a test sinewave would be more tricky: you have to either use an attenuator or an FM modulator to...
Head does have some wear, although I don't think the head is the problem given it works fine upside down. A head problem would manifest...
That's very interesting working upside down and its the clue that needs to be investigated. Wonder if it's something mechanical or the tape path...
In theory you could use the 3kHz, but this tape has 2 problems: frequency is a bit low and also it's not a full-track. In practice it's probably...
Simplest way to replace the roller is to just push the pins put without removing the carriage. However wouldn't recommend that. Otherwise you do...
Trimpot shouldn't need to be maxed out to obtain recorded levels at least close to the source. The important thing to determine is if this...
Normally the solder shouldn't need to run through to the other side to make a connection, assuming the hole is copper plated. In your case it's...
I suspect not being the head either, since it works fine on playback. The polishing recommendation made because it's something that, in my...
Table reels are not perfectly round (they have some up/down wobble at the edges), that is visible when you look at the metal part from the...
Fact that R channel sometimes also goes quiet does suggest a connection problem. You would need an oscilloscope or at least a multimeter than can...
The crackling you hear is likely related to a dirty REC/PB switch (which could be related to your problem), not to capacitors. Generally...
What is the problem with your motor ? Can't it be restored ? There is a thread about these coreless motors:...
The 2 heads in the links look almost identical to each other and by the looks of it almost identical to the one in your boombox. So chances are...
DC-DC converter only powers the Dolby circuits, so even if that's fried (which I doubt) it wouldn't explain the symptoms. Most likely it's...
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