Panasonic DP-CL18 Service Manual page 166

DP-CL18
EEPROM Interface
This is for communicating with EEPROM.
Compression
This is for compressing the RAW bitmap data for cyan, magenta, yellow and black.
Decompression
This block consists of 5 decompression blocks. One is for pre-rendering to print. The remaining 4 blocks is for color compressed
bitmap data (cyan, magenta, yellow and black). The compressed data is expanded to the bitmap data by this block.
Timers
This block is for general purpose 35bit timer. There are 3 timers.
<ASIC2 (IC24)>
ASIC1 (IC15) that is controlled by CPU is the core on the printer main control board. The following are the main functions.
IO Bus Interface
This is the bus for communicating between ASIC2 and ASIC1 (IC15). This interface communicates between ASIC1 and ASIC2
using the synchronizing clock transferring method. The frequency of synchronizing clock is 33 MHz.
PCI Interface
This is the bus for communicating 10/100 Mbps Ethernet controller IC23 (DP83816). This interface conforms with the 32bit/33
MHz 3.3 V PCI Ver 2.2 of PCI standard.
HDD Interface
This is the bus for connecting between ASIC2 and hard disk (HDD). This interface that conforms with the ATAPI3 standard
drives the hard disk at the PIO mode 4 and multi word DMA mode 2.
10.1.2. Power Supply Board
This board supplies DC low voltage (+5V, +5VA, +5VB, +3.3V, +24V, +24VA, +24VB, +24VC) to each board.
Voltage
+5V Engine Control Board, Interlock Switch
+5VA Main Control Board, Engine Control Board (Sleep Circuit), Optional 2nd Paper Feeder Board (sleep circuit)
+5VB Main Control Board
+3.3V Engine Control Board
+24V Interlock Switch
+24VA CMY Motor, MPT Paper Pickup Motor
+24VB BK Motor, High Voltage Board
+24VC Polygon Motor in LSU (Laser Scanning Unit), Power Supply Unit Fan Motor, Sub Fuser Fan Motor, Drive Motor in
option feeder, Registration Clutch, 6 Solenoids, 2 Solenoids in option feeder
10.1.3. IH Power Supply Board
This board supplies the power to IH fuser system consists of IH coil and Fuser Unit.
10.1.4. High Voltage Board
This board outputs 12 high voltages used for electronic photographic process. The 12 voltages consists of 2 (VCH: DC -1,000 ~
-1,400V) for C, M, Y and black color OPCs, 4 development bias (VB: DC-100 ~ -300V; AC350Vp-p) for each color, 4 supply bias
(VSR: -200 ~ -400V) for each color, FTR bias (FTR: 250 ~ 1,800V), STR bias (STR: 500 ~ 6,200V). The VCH, VB, VSR, FTR and
STR voltages are varied by D/A converter setting data from engine control board. If the signal
N is Low, VCH, VB, VSR, FTR and STR are generated. Each of the high voltages are specifically set depending on the print media,
selected resolution, printing mode, duplex printing mode, humidity/temperature range of the room. The humidity and temperature
ranges are detected by a humidity sensor.
10.1.5. Engine Control Board
This board is the core of the printer engine control. It´s major circuit consists of the EEPROM circuit, video interface circuit, high
voltage board interface circuit, accumulator control circuit, fuser temperature control circuit, fuser unit interface circuit, option feeder
interface circuit, registration clutch control circuit, solenoid control circuits, LSU interface circuit, IH control circuit, toner empty
circuit, paper tray sensor circuit, paper feed unit interface circuit, paper eject unit interface circuit, color registration sensor control
circuit,etc.
Supply to
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