Advertisement
3-12. Error Code H1-12 failure detection procedure
Checking device.
[U7004 :
PCM9211]
Checking the reset waveform. (DIR)
Check item(3-12.1.).
Checking the reset :
Check the CPU.
Is the waveform of the TP near the DIR [U7004] correct (like the one
shown in the diagram) when the power is turned on?
U7004
34 pin
YES
NO
Check the reset circuit between CPU [U6201] and DIR [U7004].
If there is no problem, the DIR [U7004] is faulty.
Replace with a new device.
Recheck from
check item (3.1.)
If it does not work, replace the PCB.
Check the communication line. (DIR)
Check item(3-12.2.).
Check the CPU.
Is the waveform of the TP near the DIR [U7004] correct (like the one
shown in the diagram) when the power is turned on?
Examples of confirmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
U7004
YES
DIR [U7004] is faulty.
Replace with a new device.
Recheck from
If it does not work, replace the PCB.
116
YES
Check the communication line :
23pin:MISO
24pin:MOSI
25pin:CLK
26pin:CS
NO
Check item(3-12.3.).
Check the communication line :
Check DIR [U7004], CPU [U6201] patterns as well as soldering.
If there is no problem, go to the next step.
check item (3.1.)
*The diagram shows an example.
(Signal patterns vary depending on the tim-
ing.)
Points for checking waveforms
- Crest value (3.3V normally)
- Signal change
- CLOCK frequency (about 2MHz)
Voltage scale : 2.0V/div
Time scale : 2us/div
Advertisement
