Checking device. [
U7004 : PCM9211
]
3-12. Error Code H1-12 failure detection procedure
YES
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
Checking the reset waveform. (DIR)
Recheck from
check item (3.1.)
If it does not work, replace the PCB.
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.
NO
Examples of confirmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
Check item(3-12.2.).
Check the communication line :
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
25pin:CLK
24pin:MOSI
26pin:CS
23pin:MISO
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 the communication line. (DIR)
DIR [
U7004
] 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
- CLOCK frequency (about 2MHz)
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
116
