Trouble Shooting; Function Description Of Each Pcb - Sanyo SFX-33 Service Manual

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5. TROUBLE SHOOTING
5-1 Function description
of each PCB
1.
M-1 PCB (Main PCB)
This PCB contains CPU and all of the control circuit.
The following functions are included.
l-l)
LSI so called FAX ENGINE (TC35168F)
@ 8-bit CPU
@ MODEM
– Modulation
and Demodulation
– Tone signal generation
and detection
– DTMF signal generation
– Pre-recorded
voice prompt generation
– Melody on hold
@) CODEC
– Coding and decoding of image signal
@ Image signal processor
– CIS (Contact Image Sensor) driver
– Convert analog signal to digital signal (two or multi values)
@ DMA (Direct Memory Access) controller
– This is used when transferring
the data from image signal processor to line memory,
from line memory to MODEM, thermal head and CODEC.
@ Real time clock
0 Stepping motor control
@ 1/0 ports for
– Mechanism
– Operation
Panel
– LCD control signal
1-2) Gate Array (LPD65622)
– 1/0 port for NCU and TEL. control signal
1-3) 512Kbit EP-ROM
– contains CPU control
1-4) 64Kbit SRAM
– This is used for temporary
memory for image data memory and various data memory such
as Activity report, one touch & speed dial list, Feature switch & RAM CODE data and etc.
1-5) Memory back up control
– This is used for keeping the stored data of SRAM and real time clock.
1-6) NCU l/F circuit
– This circuit is used for connecting
NCU (Network Control Unit) and MODEM.
2. M-2 PCB (Operation
Panel)
– This PCB contains key matrix circuit controlled by ROW and COL signals and LED circuit.
18

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