Panasonic BB-HCM381A - Network Camera, Service Manual

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The ZOOM motor, which type is a stepping motor, is driven with the motor driver (IC1002). The drive
system is Constant Current Drive 2W1-2 Phase Excitation Micro Step Drive. It works by 1 step to the
direction set by ZMDIR signal, per 1 clock of ZMCLK signal given to IC1002. The motor current flows as
below. In phase A: 6V power Q1004 6pin Q1004 1pin ZAP signal motor phase A ZAN
signal IC1002 14pin IC1002 19pin R1005 GND, or, 6V power Q1004 3pin Q1004 4pin
ZAN signal motor phase A ZAP signal IC1002 16pin IC1002 19pin R1005 GND In
phase B: Q1005 3pin Q1005 4pin ZBP signal motor phase B ZBN signal IC1002 11pin
IC1002 6pin R1006 GND, or, 6V power Q1005 6pin Q1005 1pin ZBN signal motor
phase B ZBP signal IC1002 9pin IC1002 6pin R1006 GNDThe motor driving direction is
determined by ZMDIR signal.
15.1.3.3. Focus Motor Drive Block
FOCUS motor, which type is a stepping motor as ZOOM motor, and which drive circuit is also same type
as ZOOM motor, is driven with the motor driver (IC1001). The drive system is Constant Current Drive
2W1-2 Phase Excitation Micro Step Drive. It works by 1 step to the direction set by FMDIR signal, per 1
clock of FMCLK signal given to IC1001. The motor current flows as below. In phase A: 6V power
Q1003 6pin Q1003 1pin FAP signal motor phase A FAN signal IC1001 14pin IC1001
19pin R1003 GND, or, 6V power Q1003 3pin Q1003 4pin FAN signal motor phase A
FAP signal IC1001 16pin IC1001 19pin R1003 GND In phase B: Q1006 3pin Q1006
4pin FBP signal motor phase B FBN signal IC1001 11pin IC1001 6pin R1004
GND, or, 6V power Q1006 6pin Q1006 1pin FBN signal motor phase B FBP signal
IC1001 9pin IC1001 6pin R1004 GND The motor driving direction is determined by FMDIR
signal.
15.1.3.4. EEPROM Block
- EEPROM (IC1009)
Power-supply voltages: 3.3V
Package: 8pin SOP
Memory Capacity: 2K x 8bit
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