Epson DM-M820, Technical Reference Manual

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8-18 Troubleshooting Rev. I
4. Confirm that the power consumption for the PCI slots, COM ports, keyboard/mouse
port, and USB port conform to the specifications in the table below.
The individual ports possess the capacity limits in the table below.
5. Test using the procedures described in the section, “Possible Short in System,” on page
8-17.
6. Test using the procedures described in the section, “System Halts on Intermittent Basis,”
on page 8-16.
Unable to Switch Off Power Supply
❏
Follow the procedures below.
1. Confirm whether the power supply switches off after the power switch is pressed for a
period of 4 or more seconds.
2. Confirm whether replacing the switch cable assembly solves the problem.
3. Proceed to section, “Procedures for Testing the Power Supply,” on page 8-23, and test
the power supply.
4. Confirm whether replacing the main circuit board solves the problem.
Power supply Application Capacity
+ 5 VDC PCI slot, COM ports, keyboard/mouse, USB 2.0 A
+ 3.3 VDC PCI slot 1.0 A
+ 12 VDC PCI slot, COM ports 1.0 A
– 12 VDC PCI slot 0.02 A
+24 VDC TM printer 2 A
Port Power supply Supply capacity Stipulations
COM port + 5 VDC 500 mA each (peak 1A/100
ms) Total current and + 5 VDC
and + 12 VDC must not
exceed the value shown at
left.
+ 12 VDC 500 mA each (peak 1A/100
ms)
USB port + 5 VDC 500 mA each (peak 1A/
100ms) —
Keyboard and mouse + 5 VDC 500 mA each (peak 1A/
100ms) —