CMD-711EX AXIOM, CMD-711EX Datasheet - Page 14

• Manufacturer Part Number: CMD-711EX
• Description: Microprocessor Development Tool
• Manufacturer: AXIOM

Specifications of CMD-711EX

• Silicon Manufacturer: Freescale
• Kit Contents: Board
• Silicon Family Name: 68HC11E
• Silicon Core Number: MC68HC11E9FN, MC68HC11E20FN
• Development Tool Type: Hardware - Eval/Demo Board
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

TROUBLESHOOTING
The CMD711-EX board is fully tested and operational before shipping. If it fails to function properly, inspect the board
for obvious physical damage first. Ensure that all socketed IC devices are properly seated in the their sockets.
Verify that your PC communications port is working by substituting a known good serial device, or by doing a loop
back diagnostic. Verify that no other devices are conflicting with your PC serial port (such as a mouse, modem, etc.).
Check your hardware configuration jumpers and switches. Verify the power source. You should measure 9 volts
between GND and +9V test points on the board. If no voltage is found, verify the wallplug connections to 115V AC
outlet and power connector. Disconnect all external connections to the board except for COM1 to the PC and the wall
plug. Follow these steps in the order given:
Hardware Troubleshooting Steps
Please check off these steps and list any others you have performed before calling so we can better help you.
TROUBLESHOOTING
1. Visual Inspection
2. Verify that all MODE switches are switched OFF.
3. Verify power by checking for +9 volts between GND and +9V test point pads. The Green LED should be
4. Verify the Monitor EEPROM for proper installation (no bent pins) and proper jumper settings for the
5. Check the Configuration Byte. Normally ROMON should be disabled (OFF). If accessing Internal
6. Disconnect any peripheral devices including the LCD and Keypad.
7. Make sure that the RESET line is not being held low.
8. Verify the presence of a 9.8MHz sine wave on the crystal if possible.
ON.
device used.
EPROM then ROMON should be ON.
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