Check item(27).
Check the communication line :
Check the CPU.
Is the waveform of the TP near the DIR [
U1040
] correct (like the one
shown in the diagram) when the power is turned on?
U1040
DR_CK 25pin
DR_DOUT 23pin
DR_CE 26pin
DR_DIN 24pin
Check item(28).
Check the communication line :
Check DIR [
U1040
], CPU [
U1013
] patterns as well as soldering.
If there is no problem, go to the next step.
Check the communication line.
DIR [
U1040
] 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 (3.3 V normally)
- Signal change
- CLOCK frequency (about 2 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.
90
Caution in
servicing
Electrical
Mechanical
Repair Information
Updating
