Kenwood FZDA07ELEF2 Service Manual page 12

FZDA07ELEF2/EREF2/MRHF2
● SWITCH UNIT (X34-553x-xx)
Ref. No.
IC1 2KEEPROM, Retain µ-com setup conditions
IC2 3.3V linear power supply, Used in BT module
IC3 2.2V linear power supply, Used in VFD fi lament
IC4 Communication between µ-com and VFD (Level shift)
IC5 Panel control µ-com
Q1 ON/OFF control of VFD driver 16V power supply
Q2 Switching driver of VFD driver 16V power supply control Driver to control Q1 with the µ-com
Q3 ON/OFF control of VFD logic 5V power supply
Q4 Switching driver of VFD logic 5V power supply control
Level shifter for communication between system
Q5
µ-com and panel µ-com
Q8 BRIGHT signal level shifter for HTR communication
Q10 HTR communication HTR signal level shifter
● DVD UNIT (X37-1100-00)
Ref. No.
IC1 RF signal processing IC
IC3 FLASH ROM
IC4 Optical disc control IC in µ-com
IC5 Voltage detection IC
IC7 3.3V power supply
IC8 Voltage detection IC
IC9 1.5V power supply
IC10 Driver IC
IC11 EEPROM
IC12 OP-AMP for Iop measurement
Q1 Register integrated transistor
Q2 Register integrated transistor
Q3 Register integrated transistor
Q4 Register integrated transistor
Q5 MOS-FET
Q6 MOS-FET
Q12 Transistor for APC
Q13 Transistor for APC
Q14 MOS-FET
Q15 Register integrated transistor
Q16 Transistor for APC
Q17 Transistor for APC
Q18,19 Register integrated transistor
12
COMPONENTS DESCRIPTION
Application / Function
Application / Function
Operation / Condition / Compatibility
N_D3.3V operation, Communicate with µ-com (IC5)
N_D5V input, 3.3V output, Supplied to BT module (A1)
N_D5V input, 2.2V output, Supplied to VFD fi lament (ED1)
Level shift communication between µ-com (3.3V) and VFD(5V)
N_D3.3V operation, SW, VOL input & VFD control processing (System µ-com)
Control the timing to terminate the start to protect VFD
Control the timing to terminate the start to protect VFD
Driver to control Q3 with the µ-com
Level shifter for communication between system µ-com (5V) and panel
µ-com (3.3V)
Communication level shifter between HTR (5V) and panel µ-com (3.3V)
Communication level shifter between HTR (5V) and panel µ-com (3.3V)
Operation / Condition / Compatibility
RF signal processing
Maintain F/W for optical DISC control IC
Optical DISC general control / ATAPI interface
For system resetting of optical DISC control IC
5V→3.3V
For 1.5V power supply IC voltage monitor
5V→1.5V
Focus coil, Tracking coil, Spindle motor, Sled motor and Lo/Ej motor drive
Maintain data for optical DISC control IC
For IOP measurement
SL. MUTE control
For FG signal
LO.MUTE control
DRMU control
Laser diode ON/OFF control for DVD
Laser diode ON/OFF control for CD
Laser diode brightness control for CD
Laser diode brightness control for DVD
For IOP measurement
HFM ON/OFF control
For DVD laser diode protection (Current limit)
For CD laser diode protection (Current limit)
3.3V power supply IC ON timing control