Epson MR Series Technical Reference Manual page 214

5. Measure the voltage between each terminal on the 20-pin connector and the voltage of
all drive connectors. If the voltage differs from that shown on the chart below, replace
the power supply.
HDD End of Power Cable
COM Port Circuit Board End of Power Cable
Power supply voltage check
Voltage system
+3.3 V system
+5 V system
+5 VSB system
+12 V system
–12 V system
+24 V system
* Voltage range when electric current of 1A and more is consumed.
8-24 Troubleshooting
11
1
20-pin connector
Yellow(+12V)
Black(GND)
Measurement terminals
Pin 1 – pin 15
Pin 2 – pin 15
Pin 11 – pin 15
Pin 4 – pin 15
Pin 6 – pin 15
Pin 19 – pin 15
Pin 20 – pin 15
Pin 9 – pin 15
Pin 10 – pin 15
Pin 12 – pin 15
20
10
FDD and CD-ROM End of Power Cable
Black(+24V)
White(GND)
Normal voltage
+ 3.14 ~ + 3.47 V
+ 4.75 ~ + 5.25 V*
+ 4.75 ~ + 5.25 V
+ 11.4 ~ + 12.6 V
– 10.8 ~ – 13.2 V
Rev. I