Power Circuit; Typeand Usage Of The Power Supplyvoltages - Epson DLQ-3000 Service Manual

Operating Principles

2.2 POWER CIRCUIT

Figure 2-9 provides a block diagram of the power supply circuit.
The primary structure of the BOARD ASSY., C124 PSB and C124 PSE units is the same. The lower
portion of each block gives the location of the element.
The power supply of the DLQ-3000 is composed of the power switch, AC inlet, and switching
power supply boards (BOARD ASSY.,C124 PSB/PSE). They supply the voltages necessary for
controlling the printer and driving the printer
specifications for each power supply board.
Table 2-17. Electrical Specifications of the Power
Name
BOARD ASSY., C124 PSB
BOARD ASSY., C124 PSE
2.2.1 Type and Usage of the Power Supply Voltages
DC volta~es are remesented bv the three blocks; +35V (CH.A, CH.B) and +5V.
The
The ringing &oke con~erter (RCC~ switching regulator circuit converts them into the DC voltages
necessary for the printer. Table 2-18 classifies the DC voltage used by the printer.
Nominal Power
continuous 'ower
CN 2
Consumption :
152.5W
CN 2
GL CN 2
continuous 'ower
CN 2
Consumption :
7.5W
continuous 'ower
CN 3
Consumption :
160W
CN 3
2-14
mechanism.
Input Voltage (AC V)
220-1 OYO to 240+1 OYO
Table 2-18. DC Voltages
.
Power Supply CH.B for Printer Mechanism
1,2,3 * Cooling Fan Motor Drive
Paper Feed Motor Drive
* CS/Ribbon Feed Motor Drive Flash ROM Vp
4,5,6 Power Ground CH.B (+35V side GND)
Logic Ground (+5V side GND)
7,8
Power Supply CH.A for Printer Mechanism
Paper Feed Motor Hold
* CS/Ribbon Feed Motor Hold
* Sensor Power Supply
9,10
* Reset Voltage (VX)
Control Panel Circuit Power Supply
* Serial Interface Level Converter Circuit Power Supply
for Main Board
Type-B Interface Power Supply
Power Supply CH.A for Printer Mechanism
1,2,3 Carriage Motor Drive
4,5,6 Power Ground CH.A (+35V side GND)
Table 2-17 gives the electrical
Supply Boards
Primary Fuse Rating
10A
T5AH
Usage