Check item(3-9.4.).
Check the SPI communication line :
Check the CPU.
Is the "
SPI
" waveform of the TP near the DSP [
U201
] correct (like
the one shown in the diagram) when the power is turned on?
U201
CS
Check item(3-9.5.).
Check the SPI communication line :
Check DSP [
U201
], CPU [
U6201
] patterns as well as soldering.
If there is no problem, go to the next step.
Check the SPI communication line. (DSP2)
DSP [
U201
] is faulty.
Replace with a new device.
YES
*The diagram shows an example.
(Signal patterns vary depending on the tim-
ing.)
Points for checking waveforms
- Crest value (3.3V normally)
- Signal change
Voltage scale : 2.0V/div
Time scale : 2us/div
NO
YES
Recheck from
check item (3.1.)
If it does not work, replace the PCB.
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
113
