Mcu Section - HYT TC-580 Service Manual

MCU Section

Normal power-on
alert tone and LCD
display
No
Keys work
normally?
Yes
Key dome
works normally?
Other
controlling pins
work normally?
No
Yes
MCU
works
normally
Normal power-on alert
tone and LCD display?
Normal power-on
alert tone but no
LCD Display
LCD works
normally?
Yes
Replace
LCD
No
Yes
Replace
dome
Start
No power-on alert
tone but normal
LCD display
Speaker works
normally?
No
Yes
Re-download the
program or replace
MCU
52
TC-580 Service Manual
No power-on alert
tone and no LCD
display
MCU
No
operating voltage
VCC works
normally?
Yes
Check
Replace
power
speaker
supply
circuit
Yes
MCU works
normally?
No
No