Panasonic KX-MC6020RU / KX-FAP317A / KX-FAB318A Service Manual ▷ View online
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KX-MC6020RU
6.17.9. D/A Convertor (8bit, 12ch) Interface Circuit
This circuit is for generating the analog voltage signals that control the high voltages (charge bias, development bias, FTR bias, and
STR bias).
STR bias).
The D/A convertor receives the serial data SDATHV synchronized with the shift clock signal SCLKHV from pin G20 of IC600
through pin 6 of CN890 on the main board. When the load signal LDHV becomes the high, the received SDATHV is loaded to the D/
A convertor.
through pin 6 of CN890 on the main board. When the load signal LDHV becomes the high, the received SDATHV is loaded to the D/
A convertor.
DAC channel and output relationship
Signal Name
Location
Description
SCLKHV
Pin 8 of CN890
This is the shift clock signal (93.4kHz at data transferring). The serial data
signal SDATHV is transferred with this clock signal to the D/A convertor.
signal SDATHV is transferred with this clock signal to the D/A convertor.
SDATHV
Pin 6 of CN890
This is the serial data for generating the analog signals that control the high
voltages (charge bias, development bias, FTR bias, and STR bias).
voltages (charge bias, development bias, FTR bias, and STR bias).
LDHV
Pin 4 of CN890
This is for loading the serial data (SDATHV) to the D/A convertor.
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KX-MC6020RU
6.17.10. Interface
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KX-MC6020RU
6.18. Main Board Section
6.18.1. Main Unit Power Supply Circuit Block Diagram
DC-DC and regulator generate desired voltage from low voltage power supply of 7V. (Refer to the block diagram shown below.)
1. Power supply diagram
2. Power ON sequence
Power ON/OFF sequence is controlled by the sequencer. (Refer to the diagram shown below.)
Type of power supply and its application
Type
Contents
1.2V
SOC(IC300) Core power supply
1.5V
ASIC(IC600) Core power supply
2.5V
DDR(IC400,401,960), LAN PHY(IC451) power supply
3.3V
IC buffer (SOC,ASIC) power supply, Flash ROM (IC450) power supply, etc (IC302,IC700-703,IC760,IC890)
5VD
Analog power supply (Fax,LSU,AFE(IC500) ,etc (IC830,IC831,IC891-893)
5VD2
Panel power supply
1.25VTT
DDR (IC400,401) termination power supply
1.25VTT2
DDR (IC960) termination power supply
7VB
CIS LED power supply
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KX-MC6020RU
6.18.2. DC-DC Power Supply Circuit (3.3V / 2.5V / 1.5V / 1.2V)
IC1 and IC2 are 2ch-output PWM type DC-DC converter controllers, which make up step down type DC-DC converter circuit with
Pch power MOSFET Q3, Q4, Q5, and Q6, coil of L1, L2, L3, and L4 and schottky diode of D1, D2, D3, and D4.
The oscillation frequency in operation of this DC-DC converter is set to about 410kHz.
Pch power MOSFET Q3, Q4, Q5, and Q6, coil of L1, L2, L3, and L4 and schottky diode of D1, D2, D3, and D4.
The oscillation frequency in operation of this DC-DC converter is set to about 410kHz.
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