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9. Repair and adjustment of electronic circuits
L-478 circuit board configuration
Assy Name Circuit Composition Repair Method
PCB / 1 Assy Power supply
LCD display function
Touch panel function(Including temperature
measurement)
Photometry control
Battery check circuit
LED display
Flash light triggering
Radio transmitter module interface
FLASH ROM
USB interface
Control microcomputers
Reset circuit
Clock generator
The basic repair method is replacement of
the defective circuit board and
confirmation of functions based on
troubleshooting.
PCB / 2 Assy Light measurement circuit
Cordless triggering
A/D conversion circuit
Key input function (Measuring button,
Memory button )
Control microcomputers
RF circuit
Clock generator
PCB / 3 Assy
Key input function (Power button,
Menu button )
Battery compartment
PCB / 4
Antenna circuit
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