Service manual

[2] Circuit description of control PWB
1. General description
Fig. 2 shows the functional blocks of the control PWB, which is com-
posed of 5 blocks.
Fig. 2 Control PWB functional block diagram
2. Description of each block
(1) Main control block
The main control block is composed of ROCKWELL 1 chip fax engine
(XFCR-MVP), ROM (256KByte), RAM (32KByte), DRAM (512KByte).
Devices are connected to the bus to control the whole unit.
1) XFCR-MVP (IC4) : pin-144 QFP (XFCR-MVP)
The FAXENGINE Integrated Facsimile Controllers.
XFCR-MVP, contains an internal 8 bit microprocessor with an exter-
nal 16 Mbyte address space and dedicated circuitry optimized for
facsimile image processing and facsimile machine control and moni-
toring.
2) 27C020 (IC3): pin-32 DIP (ROM)
EPROM of 2Mbit equipped with software for the main CPU.
3) SRM2B256SLMX70 (IC6): pin-28 SOP (RAM)
Line memory for the main CPU system RAM area and coding/decod-
ing process. Used as the transmission buffer.
Memory of recorded data such as daily report and auto dials. When
the power is turned off, this memory is backed up by the lithium
battery.
4) IX2129 (IC7): pin-28 SOJ (RAM)
Image memory for recording process.
• Memory for recording pixel data at without paper.
PANEL
CONTROL
BLOCK
IMAGE
SIGNAL
PROCESS
BLOCK
MAIN
CONTROL
BLOCK
MODEM/
CONTROL
BLOCK
MECHANISM/
RECORDING
CONTROL
BLOCK
MC24 CPU Control IF

MC24 Megacell (8bit Data,24bit Address)
WatchdogTimer
Real Time Clock
Crystal Oscillator
Battery Back-up Circuit
Interrupt Controller
BUS Interface

DRAM Control
Internal & External Bus Control
Internal & External Decode
DMA controller
CPU Bus
1K Intermal RAM

MC24 CPU
Shading correction
Line butter
General I/O

Motor Control
GPIO
Tone
Video Port
SART
Autobaud
Scanner Control & Video
Processing

6-Bit FADC
CCD/CIS Scanner
5ms,A4/B4 Lines
Shading Correction (1:1,1:8)
Edge Enhancement & Dithering
Multilevel B4-A4 Reduction
Dynamic ABC & Contrast Control
BI-level Resolution
Convention

Programmable
Reduction &
Expansion
T.4/T.6 CODEC

MH, MR, MMR
Haroware
Altemate
Compression &
Decompression
Thermal Printer IF

5 ms Line Time
A4/B4 Lines
TPH ADC
4 Strobe TPH
Latchless TPH
External DMA I/F
Operator Panel IF

32 keys
8 LEDs
LCD Module
SYSCLK
TSTCLK
DEBUGN
RESETN
XIN
XOUT
VBAT
VDRAM
PWRDWNN
BATRSTNBATRSTN
OPO [7:0]
OPI [3:0]
LEDCTL
LCDCS
PCLK/DMAACK
PDAT
PLAT
STRB [3:0]
THADIN
STRBPOL/DMAREQ
Internal CPU Bus
DMA Bus
External CPU Bus
MIRQN
A [23:0]
D [7:0]
RDN
WRN
ROMCSN
CSN [1:0]
MCSN
SYNC
REGDMA
WAITN
RASN
CASN[2:0]
DWRN
TONE
GPIO [7:0]/V ID [7:0]
GPIO [10:8]/VDC [2:0]
GPO11/BE/SERIN
GPIO12/CS2N/SCLK
GPIO13/CS3N/TXD
GPIO14/CS4N/RXD
GPIO15/CS5N
GPIO16/IRQ8
GPIO17/IRQ5N
GPIO18/IRQ10N
GP19/RDY/SERO
PM [3:0]/GPO [3:0]
SM [3:0]/GPO [3:0]
–VREF
+VREF
VIN
START
CLK1
CLK1N
CLK2
VIDCTL[1:0]
PWR/GND
TEST
Fig. 3
UX-510U/UX-510C/UX-500U
UX-500C/FO-1460U
5 – 2