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docs: Add a "Lost communication with MCU" section to the FAQ 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2018-10-09 11:15:22 -04:00
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docs/FAQ.md
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@ -12,10 +12,11 @@ Frequently asked questions
9. [Why is the Z position_endstop set to 0.5 in the default configs?](#why-is-the-z-position_endstop-set-to-05-in-the-default-configs)
10. [I converted my config from Marlin and the X/Y axes work fine, but I just get a screeching noise when homing the Z axis](#i-converted-my-config-from-marlin-and-the-xy-axes-work-fine-but-i-just-get-a-screeching-noise-when-homing-the-z-axis)
11. [My TMC motor driver turns off in the middle of a print](#my-tmc-motor-driver-turns-off-in-the-middle-of-a-print)
12. [When I set "restart_method=command" my AVR device just hangs on a restart](#when-i-set-restart_methodcommand-my-avr-device-just-hangs-on-a-restart)
13. [Will the heaters be left on if the Raspberry Pi crashes?](#will-the-heaters-be-left-on-if-the-raspberry-pi-crashes)
14. [How do I convert a Marlin pin number to a Klipper pin name?](#how-do-i-convert-a-marlin-pin-number-to-a-klipper-pin-name)
15. [How do I upgrade to the latest software?](#how-do-i-upgrade-to-the-latest-software)
12. [I keep getting random "Lost communication with MCU" errors](#i-keep-getting-random-lost-communication-with-mcu-errors)
13. [When I set "restart_method=command" my AVR device just hangs on a restart](#when-i-set-restart_methodcommand-my-avr-device-just-hangs-on-a-restart)
14. [Will the heaters be left on if the Raspberry Pi crashes?](#will-the-heaters-be-left-on-if-the-raspberry-pi-crashes)
15. [How do I convert a Marlin pin number to a Klipper pin name?](#how-do-i-convert-a-marlin-pin-number-to-a-klipper-pin-name)
16. [How do I upgrade to the latest software?](#how-do-i-upgrade-to-the-latest-software)
### How can I donate to the project?
@ -225,6 +226,28 @@ experience this problem during homing, consider using a slower homing
speed. If you experience this problem in the middle of a print,
consider using a lower square_corner_velocity setting.
### I keep getting random "Lost communication with MCU" errors
This is commonly caused by hardware errors on the USB connection
between the host machine and the micro-controller. Things to look for:
- Use a good quality USB cable between the host machine and
micro-controller. Make sure the plugs are secure.
- If using a Raspberry Pi, use a good quality power supply for the
Raspberry Pi and use a good quality USB cable to connect that power
supply to the Pi.
- Make sure the printer's power supply is not being overloaded. (Power
fluctuations to the micro-controller's USB chip may result in resets
of that chip.)
- There have been reports of high USB noise when both the printer's
power supply and the host's 5V power supply are mixed. (If you find
that the micro-controller powers on when either the printer's power
supply is on or the USB cable is plugged in, then it indicates the
5V power supplies are being mixed.) It may help to configure the
micro-controller to use power from only one source. (Alternatively,
if the micro-controller board can not configure its power source,
one may modify a USB cable so that it does not carry 5V power
between the host and micro-controller.)
### When I set "restart_method=command" my AVR device just hangs on a restart
Some old versions of the AVR bootloader have a known bug in watchdog