Check item(33).
Check the SPI communication line :
Check the CPU.
Is the "
SPI
" waveform of the TP near the DSP [
U1073
] correct (like
the one shown in the diagram) when the power is turned on?
U1073
3 pin CLK
4 pin MOSI
6 pin CS
5 pin MISO
Check item(34).
Check the SPI communication line :
Check DSP [
U1073
], CPU[
U1018
] patterns as well as soldering.
If there is no problem, go to the next step.
Check the SPI communication line.
DSP [
U1073
] is faulty.
Replace with a new device.
YES
*The diagram shows an example.
(Signal patterns vary depending on the
timing.)
Points for checking waveforms
- Crest value (3.3V normally)
- Signal change
- CLOCK frequency (about 6 MHz)
Voltage scale:2.0V/div
Time scale:2us/div
NO
YES
Recheck from
check item (1).
If it does not work, replace the PCB.
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
106