Samsung SCX-1100 Service Manual page 91

CIRCUIT DESCRIPTION
3-7-2-2 DC-DC Converter Controller
This System uses VCC by converting it to +5V, and +3.3V, the power source of the system, is obtained from the +5V convert-
ed by using REGULATOR IC to use. VPH is used as the head power by converting it to +11.82V.
3-7-2-3 Power On Reset Generation Circuit
This System does not use Power On Reset Generation Circuit.
3-7-2-4 Motor drive part
This System uses DC Motor for CR(Carriage Return) MOTOR, and Stepper motor for LF(Line Feed) motor.
• CR(Carriage Return) MOTOR drive circuit description
1 CR MOTOR specification
CR MOTOR performs reciprocating movement of CARRIAGE from side to side so that INK CARTRIDGE may print on the
paper.
• MOTOR TYPE : PM DC MOTOR "declination"
• Drive voltage : +30VDC
• Winding line resistance : 12Ω ± 2Ω
• Driver IC : Thunderbolt
2. CR MOTOR drive
2-1. DC Motor operation
DC Motor drive uses positive phase terminal(+) and anti-phase terminal(-) bound together respectively using 2nd Motor
Driver(MD2) of Thunderbolt ASIC inside, and controls two-way operation of DC motor, by receiving input of "DIR_DCM,"
7th bit among "PWM"(DC-motor Pulse Width Modulation) signal, output of Jupiter-III, and 13Bit Serial Port Inputs("TBDO"
Signal) coming into Thunderbolt ASIC transmitted from Jupiter-III. This Driver is driven by VBULK power source(+30V),
and on terms of Motor Stall not being generated, it is designed to supply 750mA current, and 2.4A current to output ter-
minal for maximum length of 100ms.
Repair Manual
3-32
< Figure 22. DC-DC Converter Controller Diagram>
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