Can you do a WFGUI reading of the W&F for both PB (with a known-good 3kHz tape) and this tape recorded on the unit ? It does sound like W&F and I...
Regarding pre-recorded cassettes speed, yes it's indeed unlikely to be off by a significant amount. It's just that (unlike a test tape) we don't...
Yes I forgot there were 2 versions of this mech: AR20 and AR21. Thanks for pointing that out ! Corrected the previous statement. To me the AR21...
One interesting thing is how Panasonic gave the model numbers on these walkmans. This AR21 mecahnism is typical of RQ-X series (which all use...
Looks much better than before, but that W&F is high. Recommend doing 2 things: - oil the front bearing of the motor if you haven't done so...
As far as speed adjustment goes, if you use a song you know well, you can get within +/-10Hz just by ear. But there's another variable that has...
Don't think you understood how to do the test. We're interested in the voltage WHEN (at that exact point, not after) the motor is slowed down by...
You can isolate the fault by removing R616. See if the voltage at pin 9 keeps raising even with that part of the circuit completely disconnected....
D701 is a 7.5V zener diode, used as a voltage reference in the DC-DC converter circuit. However thid DC-DC only powers the PLL, so it's easy to...
These older units almost always use the 13 x 8 x 2mm for the pinch roller: https://fixyouraudio.com/product/pinch-roller-13x8x2mm/ C clips are...
Regarding rubber tires, getting these from a donor unit is not a good idea as it will have similar age and rubber will be degraded to a similar...
No, I suggest removing the solder bridge not the IC (hence why stating "PLL bridge"). Pin 9 should only reach 0.7-0.8V when the motor stops (no...
You need to adjust the center gear arm height in this case. This is a common problem, that's why walkman needs to be tested upside down also...
First thing I would check is what happens at pin 4 of IC5. This should stay high (3V) and be pulled low (0V) briefly only when STOP is triggered....
First thing to note is the 3V specified in the manual is with alkaline batteries, with NiMH that voltage will be a bit lower (2 x 1.2V = 2.4V)....
For WM-100/200/500 series you will need the ones at 8.34$ that has the hub sleeve only on one side not on both. The other can be modified to fit...
@Impala67 It's not the amorphous head that makes the difference, but the tape path alignment and level + bias adjustments (latter only if the tape...
Given everything works ok with the remote, the problem can't be mechanical (meaning related to mechanism). However it is possible there's too...
@Neko Prince Regarding the commutator, using a cotton swab soaked in contact cleaner or IPA is enough to clean it. For lubrication, you need...
Yes that is the intended design. Lever controlling S701 shouldn't slip when the PCB is fully pressed down. Make sure the tip of that switch is...
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