Manual for coolpix 501 - Cameras

Unknown make pretty much. Not available, so do it by the number of buttons. They are all made in the same Chinese factory.

https://www.google.com/search?q=pod+501+watch+manual

4 button chronograph instructions

https://www.google.com/search?q=4+button+digital+chronograph+instructions

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Question edited into Title - Description, and edited for clarity

Page 7 of the Manual. You have the year set wrong.

https://studylib.net/doc/18894214/maruzen-atr-501-user-manual

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I searched but could not find a manual for that model on the internet.

Another product manual might be helpful in case it is similar to yours.

http://63.135.101.60/catalog/Documents/SEVEN_DAY_TIMER.pdf

https://www.manualshelf.com/manual/salav/stm-501/use-and-care-manual.html

HP 384162-501 System Board For Proliant Ml350 G4 the manual at HPE.COM , FULLY COVERS THIS SERVER.
If there is a problem say so and tell symptoms first
I have DL380-7 know it well. and how to use iLo, and see logs.

You can find the manual for the VXL-501+ which even includes a miniature schematic diagram at this link:
http://www.retrevo.com/support/Raymarine-501%2B-Radios-manual/id/556ag104/t/2/ - hope that will do it for you. Good luck!

Try this website it should be free
http://www.onkyousa.com/Downloads/manuals.php?source=globalnav

Do you know anything about automotive electronics ? The GEM - generic electronic control module is in charge of turning on the wipers an control the power windows . Would think this a fuse problem . Computer problem maybe , the first step in diagnosing a problem like this would be to hook up a factory or professional scanner an checking for DTC'S - diagnostic trouble codes . Don't think about replacing the GEM module ,if you don't know how to test it's electrical circuits an check for codes . Can set a number of codes !
B1431 Front Wiper RUN/PARK Relay Coil Circuit Failure GEM REFER to Section 501-16 . B1432 Front Wiper RUN/PARK Relay Coil Circuit Short to Battery GEM REFER to Section 501-16 . B1434 Front Wiper HI/LO Speed Relay Coil Circuit Failure GEM REFER to Section 501-16 . B1436 Front Wiper HI/LO Speed Relay Coil Circuit Short to Battery GEM REFER to Section 501-16 . B1438 Front Wiper Mode Select Switch Circuit Failure GEM REFER to Section 501-16 . B1441 Front Wiper Mode Select Switch Circuit Short to Ground GEM REFER to Section 501-16 . B1446 Front Wiper Motor PARK Sense Circuit Failure GEM REFER to Section 501-16 . B1450 Wiper Wash/Delay Switch Circuit Failure GEM REFER to Section 501-16 . B1453 Wiper Wash/Delay Switch Circuit Short to Ground GEM REFER to Section 501-16 . B1458 Washer Pump Motor Relay Coil Circuit Failure GEM REFER to Section 501-16 . B1460 Washer Pump Motor Relay Coil Circuit Short to Battery GEM REFER to Section 501-16 . B1462 Seat Belt Switch Circuit Open or Seat Belt Buckled GEM REFER to Section 413-09 . B1466 Wiper HI/LO Speed Not Switching GEM REFER to Section 501-16 . B1473 Wiper LO Speed Circuit Motor Failure (Wiper Energized and Park Sense Not Seen) GEM REFER to Section 501-16 . B1476 Wiper HI Speed Circuit Motor Failure (Wiper Energized and Park Sense Not Seen) GEM REFER to Section 501-16 . If you don't know any of this , your best bet take it to a qualified repair shop.

DVD's: does it display any kind of error? All DVD's?

To your second question.

The manual explains cable and TV hookup for CABLE but there is no mention of off-air TV tuning.

If you don't have the manual go to:
http://www.retrevo.com/support/Motorola-DCP501-Receivers-manual/id/393bh936/t/2/ and register to get it. It's free.