Maintenance Manual

Maintenance Manual
7
3 Detailed Function Circuit
3.1 Download Module
When item U200 (pin N17 KCOL0) status is LOW, program select download mode.
Item U200 (pin N17 KCOL0) connects I/O or TEST point (BOOT_L).Program can be
download through USB I/O or test point when BOO_L connects GND.
Step 1. whether SMD component of D/L Circuit is correct, not damaged and missing;
Step 2. whether PCB route is connecting;
Step 3. whether IC U200 is damaged.
Figure 3.1.1 BB IC D/L interface
Figure 3.1.2 USB I/O interface