3-9. Error Code H1-09 failure detection procedure
Check item(31). Check the power supply voltage.
:
Does the power supply voltage of the DSP [U252]
indicate the appropriate voltage (1.1V, 1.5V or
3.3V)?
The test points are as follows.
U252
C273: 1.5V
L1911: 1.1V
R357: 3.3V
1.1V
1.5V
3.3V
Check item(32). Check the power supply voltage.
:
Check power supply parts [U1903, U1906] on the
board, the surrounding layout and signal paths.
If there is no problem, remove the DSP [U252]
from the substrate and measure the voltage at
the test point of check item (31).
Is the voltage correct (1.1V, 1.5V)?
Check the power supply voltage. (DSP2)
Checking device. [U252 : ADSP21573]
Go to next page.
NO
DSP [U252] is faulty.
Replace with a new device.
Recheck from check item (1).
If it does not work, replace the PCB.
The power supply circuit is faulty.
Replace the PCB.
NOYES
YES
Check item(33). Checking the reset :
Check the CPU.
Is the waveform of the RESET near the DSP [U252] correct (like the
one shown in the diagram) when the power is turned on?
U252
R272: RESET
Checking the reset waveform. (DSP2)
Recheck from check item (1).
If it does not work, replace the PCB.
Check the reset circuit between CPU [U6201] and DSP [U252].
If there is no problem, the DSP [U252] is faulty.
Replace with a new device.
NOYES
Examples of conî™°rmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
Before Servicing
This Unit
Electrical Mechanical Repair Information Updating
109
To Next Page
Loading...
