Samsung VP-D455, Service Manual, Page: 135 / 184

Circuit Operating Description
Samsung Electronics 13-7
DCDC
BLOCK
PRML
BLOCK
PREAMP
BLOCK
DV1_Chip
BLOCK
AV I/F
BLOCK
CAMERA
BLOCK
TMP1962F10
(IC501)
MICOM
LB11993W
(IC401)
MOTOR
DIRVER
T/S SENSOR
REEL SENSOR
MIC SENSOR
DRUM
MOTOR
CAP.
MOTOR
LOAGDING
MOTOR
RS5C372A
(IC502)
RTC IC
RESET-IC
XC6413FY01MR
(IC503)
EEPROM
524AB0X91
(IC505)
W
U
V
FG/PG
W
U
V
FG
Fig. 13-5 VCR Circuit Block Diagram
13-3-3 SYSCON/SERVO Block H/W Function Specifications
MICOM IC uses 13.5 MHz for the main clock, communicates with the Camera Block and the DV1 Chip
Block, and controls each mode switching. Below are the main functions of MICOM IC:
1) Power On/Off Control
2) DV1 Chip Control/PRML Control/Audio Control
3) Input control for Function Keys and Remote Control Keys
4) IEEE 1394, LCD/CVF Control
5) Mechanism Control
SERVO BLOCK controls the speed and phase of the DECK’s Drum Motor and Capstan Motor according to
received PWM PULSE for motor control and the On/Off control signal from MICOM. It also receives various
sensor signals (TOP/END, T/S REEL, REC PROOF, etc.), amplifies them, and outputs the signals to MICOM.
In Rec mode, DRUM SERVO controls the Drum Motor's rotation so that the video head can play back the
signal, which minimizes the phase changes. CAPSTAN SERVO regulates the Capstan Motor's rotation so
that the video head reads the recorded track accurately and can obtain the playback signal at a maximum
level. It also controls the Loading Motor with the LOADING MOTOR 4.7V VS.