User manual

PICDEM™ LAB II DEVELOPMENT
BOARD USER’S GUIDE
 2015 Microchip Technology Inc. DS40001814A-page 25
Chapter 4. Troubleshooting
4.1 THE BOARD WILL NOT POWER-UP
• If the power indicator LEDs LD1 and LD2 do not light:
- Verify power is connected to the board.
- If the 9V input is used, verify the switch SW1 is in the on position.
- Verify the jumpers on J2 and J6 are placed correctly.
- Verify the 3.3V and 5.0V outputs are not shorted to GND.
• If only one of the power indicator LEDs does not light:
- Verify the jumpers on J2 and J6 are placed correctly.
- Verify that the missing voltage output is not shorted to GND.
• If both power indicator LEDs light but V
VAR
is missing:
- Verify that the V
VAR
voltage output is not shorted to GND.
- Verify the voltage adjustment potentiometer R7 is not broken.
For all other problems, consult Microchip’s online help system.
4.2 THE MICROCONTROLLER WILL NOT PROGRAM/DEBUG
• If the programmer does not recognize the microcontroller:
- Verify that the version of MPLAB X IDE loaded on the computer is yel-
low/green lighted for the microcontroller; if not, download the latest version.
- Verify that the programmer/debugger is yellow/green lighted for the
microcontroller; if not, download the latest version of the MPLAB X IDE.
- Verify the programmer/debugger is plugged into the correct ICSP connector
with the correct orientation.
- Verify the programmer/debugger is connected to a working USB port on the
computer.
- Verify power is present on the PICDEM™ Lab II Development Board.
- Verify voltage is supplied to all V
DD pins of the microcontroller.
- Verify the ICSP connections to the microcontroller are not loaded by external
circuitry. See the documentation for the programmer/debugger.
- Verify the MPLAB X IDE recognizes the programmer/debugger; if not, consult
the MPLAB X IDE documentation for corrective actions.
• If the programmer recognizes the microcontroller but will not program the device:
- Perform a bulk erase of the microcontroller.
- Verify the low-voltage programming fuse in the Configuration Word is disabled
in the code.
- If the problem persists, contact Microchip concerning the replacement of the
microcontroller.
For all other problems, or if the problem persists, contact Microchip’s help line for
further assistance.