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CX-683
1.3 POWER SUPPLY AND DRIVER BLOCK (BA5985FM: IC401)
1) Power supply
Switched system power supplies MDVD and PVD (8.3V) from the mother board and backup system power supply VDD
(5V) are used for this system (see the power supply system diagram).
3.3V for driving MD/LSI system and LD is generated from MDVD. In order to drive large current, only PVD (3.3V) is
used as the driver power.
Pro-test is prepared to detect voltage error in MDVD.
As soon as overvoltage beyond 9.9V or undervoltage below 3.5V is detected, MD microcomputer turns off the start
control signal (VDON) from VD to stop supply of VD from the mother PCB.
In this case, ERR A0 indicating a power supply system error is displayed on the product.
2) Driver block
It is a linear driver used for driving 5 channels consisted of 1 channel on Load/EJ system and 4 channels on
actuator/SPDL/CRG system.
Forward/reverse drive (approximately 7.5V) of the Load/EJ system is implemented by the control signals (MLOAD AND
MEJCT) from the MD microcomputer.
4-channel system conducts binary PWM signal to the differential L.P.F, then supplies it driver.
You can monitor respective signals as analog signals (FIN, TIN, SIN and CIN).
SFDR
< IC201 >
SRDR
SPRD
< IC201 >
SPFD
CN401
LO+
LOAD/ET
M
LO–
Motor
SO+
SPDL
M
SO–
Motor
CRG
M
Motor
10
MEJCT
C+
CRG
SYSTEM
C–
RC
CIN
LADDER
S+
SPDL
S–
SYSTEM
RC
SIN
LADDER
GND
PVD
LOP
LOM
SOM
SOP
COM
COP
TRKG SYSTEM
TRDR
MLOAD
TFDR
T+
RC
LADDER
T–
TIN
F+
FFDR
FOCUS
F–
SYSTEM
RC
FIN
FRDR
LADDER
GND
CONT
PVC
GND
CN101
F–
FOM
FOP
F+
TOM
T–
TOP
T+
MD microcomputer
< IC201 >
< IC201 >
FOCUS
actuator
TRKG
actuator
< IC301 >
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