Copystar Ri 2530, Руководство по обслуживанию

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3DB
2-2-1
2-2-1 Fax control PCB
Optional memory module DIMM
YC4
Data bus
Address bus
BUBAT
YC6
YC3
YC1
YC8
+12V DC
+5V DC
CPU
ASIC
Lithium
battery
BT101
PSPCB
Back up
circuit 2
Crystal
oscillator
Back up
circuit 1
RTC
A
LVC
LVC
SP
LVC
CPU
U11
ASIC
U71
Clock
driver
U12
28.224MHz
Modem
LSI
U81
Analog
circuit
FLASH
ROM
U51
U52
Analog SW
Telephone
line
Flash tool assembly
CF jig
NCUPCB
MPCB
YC7
YC5
8-bit
16-bit 32-bit 32-bit 32-bit
32-bit
B
SRAM
U62
U63
U64
U65
SDRAM
U21
U22
Figure 2-2-1 Fax control PCB block diagram
The fax control PCB (FCPCB) controls the overall fax operation.
To transmit a fax, image data scanned by the optical section of the copier is processed by the main PCB (MPCB) and then
sent to the fax control PCB (FCPCB). Received image data is first stored in the bitmap area of the SDRAM U21/U22 page
by page and compressed using the MH, MR, MMR or JBIG method. The data is then stored in the image memory area of
the SDRAM U21/U22 and sent to the modem LSI U81 to be modulated from digital signal to analog signal before it is sent
to the telephone line via the NCU PCB (NCUPCB).
To receive a fax, analog image data received from the telephone line via the NCU PCB (NCUPCB) is sent to the modem LSI
U81 and, after demodulation into digital signals, stored in the image memory area of the SDRAM U21/U22. The image data
is then decompressed and converted into the bitmap area of the SDRAM U21/U22 page by page and sent to the ASIC U71
for resolution conversion and smoothing, and is passed to the main PCB (MPCB) as print image data.