Find all the documentation for downloading your vintage hifi or audiophile Marantz on vintageshifi.com, whether it is to use your device or to repair it. You will find these documents in the form of PDF files: Download service manual, audio manuals, hifi manuals, service information, schematics, owner's manuals, brochures,. Find all the documentation for downloading your vintage hifi or audiophile Marantz on vintageshifi.com, whether it is to use your device or to repair it. Pmd221 heavy duty commercial portable cassette recorder Circa mid to late 80s unit Video was shot with my. Marantz Professional Portable Tape Recorder Tune Up Specials. Let our Marantz factory-trained. PMD221, PMD222, PMD420. Warranty service center for Marantz.
Hi all, I've got a Marantz PMD222 cool little 3 head cassette recorder. I use it for tape echo.
Centrifugal Blower Design Software. It's a two speed machine, and there is a varispeed/pitch knob. The only fallback in using this machine for echo is that the varispeed knob only works during playback. So I only have two speeds to use.Unless I can make the small mod to change the fact the varispeed gets disabled during record mode. Inside there is a PCB mounted switch that is flipped by a metal extension from the record button. This switch serves two purposes: 1: Record! 2: disable pitch knob:( I am attaching here the two pertinent schematics. RM51 is the pitch knob variable resistor.
SJ01 is the PCB mounted switch that is triggered by the record button. For the pitch disable function, the switch is called SJ01 3/4. For the record function it's called Sj01 1/4.
How do these 3/4 and 1/4 digits relate to the physical switch? Anyone have any suggestions as to how to jump it somehow so that the pitch component of the switch thinks it's always in playback? I can attach some pics of pcb underside for a sense of it. Will do that in a reply below. I'm replying here to both of your topics since they both relate to the same specific machine.
I used to have a much older three-head Marantz, from their Superscope line, and I used it for tape delay. I didn't have your issue with dry bleed; that sounds to me like aging components in the mix circuit. I did however implement the varispeed-on-playback mod you're asking about. Did you intend to only post pieces of the schematic? Because those scans are basically useless as is; the whole schematic is what we need. But it's not that hard to figure out without the schematic - you just need to find the pair of contacts that gets disconnected when it's in record mode.
I did that by trial and error; if memory serves I traced back from the varispeed pot to the switch to get a sense of which contacts might be relevant, then put the machine in record mode and manually connected contact pairs on the switch until the varispeed worked. Solder those together and you're done. Per the faulty mix circuit: Isn't there no mix circuit? It's just a recorder. Not a proper marketed tape delay.
This there is no mix/wet knob. Just input level and output level. Per the schematics for mod: looking at that zoomed in image of the variable resistor for pitch. It seems to me the playback mode has it's way of communicating w the resistor, and then the record mode has it's way of communicating with it. Your solution sounds perry but doesn't that still leave in tact the playback set of components? Elsewhere in the manual, there is this attached explanation. Doesn't that keep the resistor nulled if I don't snip the playback/pitch establishment somehow?
Actually I guess there is a chance the source/tape selection process has a fault.Yeah, when I said 'mix circuit' I just meant whatever enables you to select a source for monitoring, whether it's a switch, pot, etc. As for the varispeed pot, I see now where the pitch knob is in your original schematic swatches.
You're right; looks like you'd need to cut the trace from the wiper of the pot to the switch (to kill the playback nulling) as well as making the connection from. The other center wiper? Whatever's getting cut by the switch. Maybe that pot does indeed have two connections to the wiper, just to make the layout easier on the board. On SJ01, remove the fixed tap lead on the speed pot and connect the switch pin to the other lead from the pot (the wiper lead). The wiper lead should now connect to both outside terminals of the switch. The speed pot fixed tap now is disconnected.