PDP-5016HD
151
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The cause of a power-down that is indicated by 2-times flashing of the red LED can be identified by performing the steps
1
to
3
below:
1
Visual check with the power off
2
Tester check with the power off
3
Check with the power on
1
Status check with the power off
Check if the cables and FFC cables that are connected to the Y DRIVE Assy are firmly connected.
2
Tester check with the power off
1. Check between Vsus and SUSGND with a tester
Disconnect all cables from the X and Y DRIVE Assys and check if there is short-circuiting between Vsus and SUSGND
in the X and Y DRIVE Assys.
• How to check if there is short-circuiting on the X DRIVE Assy:
If there is short-circuiting between Vsus and SUS OUT, and SUS OUT and SUSGND, the X Mask Module is damaged.
If they are not short-circuited, check other elements to see if they are short-circuited.
• How to check if there is short-circuiting on the Y DRIVE Assy:
If there is short-circuiting between Vsus and SUS OUT, and SUS OUT and SUSGND, the Y Mask Module is damaged.
If they are not short-circuited, check other elements to see if they are short-circuited.
• Check for short-circuiting in the Power supply.
Note that at the beginning of measuring with a tester, charging of an electrolytic capacitor may cause a phenomenon
like short-circuiting. However, the resistance will soon rise if there is no short-circuiting.
2. Check for short-circuiting between VH and PSUS with a tester
Disconnect the cables that connect the bridge connectors between the Y DRIVE Assy and upper and lower SCAN
Assys.
• If there is short-circuiting in the upper SCAN Assy, one of Scan ICs in the upper SCAN Assy is damaged.
• If there is short-circuiting in the lower SCAN Assy, one of Scan ICs in the lower SCAN Assy is damaged.
• If there is short-circuiting in the Y DRIVE Assy, a circuit in the Y DRIVE Assy is short-circuited.
Check immediately after the unit is turned on before a power-down occurs.
Check the PD detection circuit.
If no problem is detected in steps
1
to
3
, a power-down occurred even though the voltage was normal.
Therefore, the PD detection circuit may be in failure.
By following the above procedures, the real cause of a power-down can be judged.
How to identify the cause of a power-down that is indicated by 2-times flashing
of the red LED
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QQ 376315150
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TEL 13942296513
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
