Fukuda Denshi FCP-7101, Service Manual

Page: 21 / 170

Chapter 2 Troubleshooting
2 - 1
On power supply in equipment (ECG AMP not included)
The following concerns the supply voltages in the equipment.
This equipment generates various DC power supply voltages (
+
24,
+
5,
+
5VSTB,
+
3.3V,
+
3.3VSTB,
+
1.8V and
−
24V) inside using the DC power
supply,
+
18V, output by the attached AC adaptor or the DC power supply
of the battery.
If the following power is not supplied, the intended functions by that power
do not work.
If
+
3.3V, is not supplied, the CPU and FPGA do not operate, whereby all
functions are inoperable.
DC power
+
18V from AC adaptor or battery pack voltage
+
24V: Supplied to the thermal head and the motor driver.
Generates
+
3.3VSTB.
+
3.3VSTB: Standby power used when DC plug is
inserted or the Battery is set.
+
5V: Used as LCD logic drive voltage or mark sensor drive
voltage. Generates
+
1.8V.
+
1.8V: Used as the core power for CPU and FPGA.
+
5VSTB: Standby power used when DC plug is inserted.
+
3.3V: Supplied to the CPU, FPGA, memory, control/logic IC,
crystal oscillator, sensor, etc. Generates
−
24V.
−
24V: Used as LC voltage VEE of LCD.