Circuit Description; System Control Biock; Block Diagram Of Electrical Block; Head/Mechanical Control Block - Sony UP-897MD Service Manual

Section 3
Circuit Description
3-1. System Control Block
3-1-1. Outline
System control is performed using IC104
(TMS320DM310ZHK22) on the MA-132 board. The
system control block consists of the following blocks.
* CPU block (ARM925)
* SDRAM control block
¢ External memory control block (Flash memory, etc.)
* DSP block (Image processing)
* External interface block (USB1.0, memory cards,
video encoder, and CCD interface)
| + SDRAM |
ccD SDRAM
NTSC/PAL
ENCODER
INTERFACE
Block diagram of IC 104
3-1-2. Block Diagram of Electrical Block
Refer to "Section 6 Block Diagram".
3-2.. Head/Mechanical Control Block
3-2-1. Outline
The thermal head/mechanical control block is the
circuit block of IC202 (CXD9182AGG) on the MA-
132 board. There is an external I/O block except the
thermal head/mechanical control block.
UP-897MD
3-2-2, Platen Motor Control
A platen driving stepping motor controls the forward
rotation/reverse rotation and rotation speed when IC202
controls driving transistors (Q603 to Q606).
1C202 Signal name State
Pin 46 PM_A1 L L H H
Pin 47 PM_A2 H H L L
Pin 92 PM_B1 L H H L
Pin 93 PM_B2 H L L H
Forward rotation —
~« Reverse rotation
3-2-3. Thermal Head UP/DOWN Control
A thermal head UP/DOWN DC motor is driven using a
driving circuit (IC201 on the SE-768 board), The DC
motor can be rotated in the forward and reverse directions.
It is controlled by IC202. Two types of optical position
sensors (photo-interrupters PH201 and PH203 on the SE-
768 board) detect the DC motor position and IC202 reads
it.
Operation of Head UP/DOWN Motor
DC motor 1C202 (pin 1) 1C202 (pin 2) Operation
or CN204 or CN204
(pin 8)DCM_O = (pin 7) DCM_1
Forward L H The thermal
rotation head is raised.
Reverse H L The thermal
rotation head is lowered.
Brake H H Stop
Stop L L Stop
State of position sensor
Position 10202 (pin 53) 1C202 (pin 96) State
or CN204 (pin 3) or CN204 (pin 5)
HEAD_P_SENSE HEAD_P2_SENSE
PRINTING L . H Printing
HOME H L Standby
(Usually)
DOOR H H Door
OPEN unlocked