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2. OUTLINE OF iD FORMAT DISC DRIVE
CIRCUIT
1. OUTLINE OF DRIVE CIRCUIT BOARD
A drive part is composed of the block diagram of the Fig. 1,
and a drive circuit board is composed of MC1, MC2 and MC3.
CAMERA
Processor
BUS
CPU
CAMERA
ASIC
ATA BUS
(IDE)
CA2
2. OUTLINE EXPLANATION OF DRIVE CIRCUIT
BOARD
2-1. MAGNETIC HEAD DRIVER CIRCUIT BOARD (MC1)
During recording, it is the driver circuit board to magnetize
toward the magnetic head.
WD_P
Large current
FET array
buffer
WD_N
EJULK
Magnetic
head
UP/DOWN
EJLK
sensor
2-1-1. EXPLANATION OF OPERATION
During recording, the data (WD_P and WD_N) from the MC3
circuit board is used to operate the large current buffer at IC801
in order to turn the FET array on and off. This is turn deter-
mines the direction of the magnetic field applied to the mag-
netic head. Also an upper limit is decided so that a magnetic
field level may not be bigger at the amplitude limitation circuit
by the data.
50
AS-MO DRIVE CIRCUIT BOARD (MC3)
ø
168
WDTX(reverse of WDT)
167
WDT
186
(A/D) THERMO
136
MO signal (play signal)
190
(A/D) FCLKAMPL
161
FCLKNP
160
FCLKPP
162
FCLKZ
163
(A/D) ADRSAMPL
189
ADRSPLS
193
DRIVE
(A/D) FES
192
(A/D) TES
ASIC
191
(A/D) SUM
209
(PWM output) FCSR
208
(PWM output) FCSF
212
(PWM output) TRKR
211
(PWM output) TRKF
207
(PWM output) SLDR
206
(PWM output) SLDF
205
SPREF
165
WCLK
171
WG
"0" Rec
"1" Play
16bit
SDCLK
96
SDRAM
(64Mbit)
To the
+
MH+
Amplitude
magnetic
limitation circuit
head
To the
-
MH-
Amplitude
magnetic
limitation circuit
head
MC1
Fig. 2
THERMO
I
RF Amplifier
J
Photo
A
sensor
B
output
FCM/ADDR
C
Amplifier
D
A
Temparature
B
C
Servo
D
E
Amplifier
F
Tracking
G
H
actuator
T+
T-
SLED+
Servo
SENSOR
SLED-
BOARD
Driver
(MC2)
F+
F-
U/V/W/COM
(BD6603KVT)
Iout
LD-ON/Off
RF-On/Off
(oscillation circuit
Lazer POWER
On/Off)
Control
PS-On/Off(Power
saveOn/Off)
ST(abnormal
(TA6015F)
detection)
The ascent and descent condition of the magnetic head is
being watched with the magnetic head up and down sensor.
2-2. SENSOR CIRCUIT BOARD (MC2)
S8003
WRPROT
Disc write protect detection switch
S8004
CARTRG
Disc setting detection switch
D8003
PUINI
Pick up location detection sensor
SPDLW
SPDLU
SPDLV
SPDLCOM
2-2-1. EXPLANATION OF OPERATION
Sensor circuit board (MC2) is the relay circuit board for the
disc write protection detection, disc setting detection switch,
the pickup location detection sensor and spindle motor con-
trol signal.
– 4 –
DRIVE MECHA and
MECHA CIRCUIT
MAGNETIC HEAD
BOARD
DRIVER CIRCUIT
BOARD (MC1)
iD disc(50ø)
Magnetic
head
sensor
Pick Up
Spindle
VCC
Focus
motor
actuator
Sread
LD
PD
motor
Laser
APC IC
(included
PICK UP)
MC2
Fig. 1
To the
spindle
motor
Fig. 3
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