Panasonic KX FLB758RU User Manual

							7.1.2. CONNECTION DIAGRAM (2)
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							7.1.3. POWER SUPPLY FLOW
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							7.2. GENERAL BLOCK DIAGRAM
The followin g is an outline of each device IC on the digital board.
 1. ASIC (IC604) Composed mainly of an address decode r and a modem control.
Controls the general FAX operations.
Performs the image processing.
CPU and Real time clock
Provides the reset pulse for each of the major ICs.
 2. G/A (IC610) Controls the operation panel I/F.
Controls the LSU I/F.
Latches lower address.
Controls FANs, LEDs and analog I/F.
 3. Flash ROM (IC606) Contain s all of the program instructions on the unit operations.
 4. Synchr onous Dynam ic RAM 4-1. (IC608) This memory is used for the parameter working in the storage area and for the page memory.
4-2. (IC603) This memory is used for image processing.
 5. CODEC (IC609)
Performs the modulation and the demodulation for FAX communication .
 6. Read Section CIS image sensor to read transmitted documents.
 7. Motor Driver Board Drives the motor.
 8. LSU (Laser Scanni ng Unit) Forms the images on the OPC drum by rotating polygon motor and reflecting the laser beam against polygon .
 9. Analog Board Composed of ITS circuit and NCU circuit.
  10. Sensor Section
Composed of a cover open switch, a document sensor, a document top sensor, a paper sensor, a paper regist sensor, a paper
exit sensor and a toner sensor.
  11. Power Supply Board Switching Section
Supplie s +5V and +24V to the unit.
  12. High Voltage Power Supply Board
Supplie s bias need for the printing operation: bias of the Drum, develop ing and transcription.
  13. Fixing Unit
Composed heat lamp, thermistor and thermal fuse.
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							7.3. FACSIMILE SECTION
7.3.1. DIGITAL SECTION
7.3.1.1. DIGITAL BLOCK DIAGRAM
CN614TOHVPS
CN615TOSMPS
CN613TOLASER
CN612TOPOLYGON
CN611
TO OPE
TOPARALLEL
IC610 IC604
G/A
MFC2000
IC606
IC608
FLASH
SDRAM
SDRAMIC603
CN600
CN607
TOUSB
CN601
TO
MOTOR
(CIS)
CN602
TO
MOTOR
(ADF)
TOMOTOR
(ENGIN)
CN605CN608
TO
FB
CN608
TO 
THERMISTOR
TO FAN
CN609
TO SOLENOID
IC609
CODEC
TO ANALOG CN616
CN606
DEV,CHG,TRS,SENCTL1
DRUM,TOPCVR,REGIST+24V,+5V
HTRON
XHSYNC
LDON,APC,VIDEOXREADY
POLON,POLCLK
KSTART,KLATCH,KSCLK,KTXD KRXD,JOG1,JOG2
CN603
FANDET1
FANON1
FANON2PICKUP
SRAS
SCASSWE
SCS
SCLK(40MHz) SCLKE
SDQML
SDQMUSA[13:12]
XRESET,XCS,CLK(10MHz),DMAACK
ALE
SCLK(40MHz)
IRQ,DMAREQ
XWR
XRD XROMCS
D[15:0] A[11:0]
A[17:12]
SDA[12:0]
SDD[15:0]
SDCASSDWE
SDCS
SDCLK(100MHz) SDRAS
SM[3:0
]
USB_Dp USB_Dn
PIOD[7:0]ADFOPEN,FBOPEN,P.F,DOCU
PM[3:0]PAPERCISPOS0,CISPOS1
TOCIS
SIG
F1,FTG,CISON,CISLEDONCISSEL,DPISEL
DRIVER
IC600
IC601/602 BUFFER
TXA1
TXA2
LINEIN
POUT
SENIN0
OPERST32KHz28MHz
SENCTL0 SENCTL3
SENCTL4SENCTL2
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							7.3.1.2. ASIC (IC604)
This IC is used for general FAX operations.
(1)CPU:This model uses ARM equivalent CPU operating at 40 MHz.
Many of the peripheral functions are handled by custom designed LSIs.
As a result, the CPU only needs to process the results.
(2)RTC:Real time clock.
(3)DECORDER:Decords the address.
(4)ROM/RAM I/F:Controls the SELECT signal of ROM or RAM and bank switching.
(5)ANALOG UNIT:Sends beep tones, etc.
7.3.1.3. ROM (IC606)
This 2MB FLASH ROM has 31 blocks.
The capacity of each block is 64 KB.
The addresses of the this area are from 000000 H to 1FFFFFH.
7.3.1.4. GATE ARRAY (IC610)
This custom IC is used as followin g.
(1) LSU I/F Control the polygon motor and output video signal to LSU.
(2)OPERATION PANEL I/F Serial interface with operation canal.
(3) FAN MOTOR I/F Control FAN MOTOR and detect the rotation of FAM MOTOR.
(4) ANALOG I/F Serial interface for analog ASIC and electrical volume.
(5) I/O PORT I/O Port Interface.
7.3.1.5. SYNCHRONOUS DYNAMIC RAM (IC608)
This SDRAM is used for CPU work and receiving memory and page memory.
The address are from 200000 H to 27FFFFFH.
7.3.1.6. SYNCHRONOUS DYNAMIC RAM (IC603)
The SDRAM is used for Image Processing work memory.
This address are from 100000 0H to 11FFFFFH.166
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							7.3.2. RTC BACKUP CIRCUIT
 1. Function
This unit has a lithium battery (BAT60 0) which works for the Real Time Clock IC (RTC: inside IC604).
The RTC continues to work, backed up by a lithium battery even when the power switch is OFF.
 2.  RTC Inside (IC604) Backup Circuit Operation
W hen the power switch is turned ON, power is supplie d to the RTC (inside IC604). At this time, the voltage at pin F17 of the
IC604 is +3.3V. W hen the power switch is turned OFF, the BAT60 0 supplie s power to RTC through D602. The voltage at pin
F17 of IC604 is about +2.5V. W hen the power switch is OFF and the voltage of +3.3V decreases, pin F17 of RTC (IC604)
becomes roughly the same voltage as the battery voltage. RTC goes into the backup mode, in which the power consumption
is lower.
Points to notice when replacing the battery
W hen the backup battery becomes low or the backup function is turned off for repairing, recover the backup power supply
followin g the procedure described below.
(1) Replace the battery and IC. J600 should be removed beforeh and.
(2) Short the both ends of C762. (Ex. Pinch them with tweezers.)
(3) Connec t terminals of J600 with solder.
(4) Short the both ends of C762 again. (Ex. Pinch them with tweezers.)
(5) Make sure that the voltage of 3.3V/BATT test land is more than 2.7 V.
Digital Unit component view
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							7.3.3. MODEM CIRCUIT OPERATION
The CODEC (IC609) and ASIC (IC604) has all the hardware satisfyi ng the CCITT standards mentioned previously.
ASIC (IC604) controlled codec (IC609) by senial data.
This CODEC (IC609) and ASIC (IC604) has an automatic applica tion equalizer. W ith training signal 1 or 2 at the time of G3
reception, it can automatically establish the optimum equalizer.
 1. Facsimile Transmission/DTMF Line Send
The digital image data on the data bus is modulated in ASIC(IC604), and sent from pin 9 and 10 via CODEC(IC609),amplifier
IC204(5/6 →7). Analog gate array IC201(24 →22), electric volume IC202(14 →15),amplifier IC207(2 →1) and the NCU section to
the telepho ne line.
Refer to CHECK SHEET (P.137).
 2.  Facsimile Reception
The analog image data which is received from the telepho ne line passes through the NCU section and enters pin 13 of the
CODEC (IC609). The signals that enter pin 13 of the CODEC (IC609) are demodulated in the board to digital image signals and
then send pin p1 of the ASIC (IC604).
In this case, the image signals from the telepho ne line are transmitted serially. In the ASIC (IC604). Here, the internal equalizer
circuit reduces the image signals to a long-distance receiving level.
This is designe d to correct the characteristics of the frequency band centered around 3 kHz and maintain a constant receiving
sensitivity.
It can be set in the service mode.
Refer to CHECK SHEET (P.137).
 3.  DTMF Transmission (Monitor tone)
The DTMF signal generated in the ASIC (IC604) is output from pin P3, and the NCU section to the telepho ne line the same as
facsimile transmission signals.
(DTMF Monitor Tone)
Refer to CHECK SHEET (P.137).
 4.  Call Tone Transmission
This is the call signal which is generated the ASIC (IC604) and sent to the speaker.
Refer to CHECK SHEET (P.137).
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							7.3.4. RESET
RESET signalThe System Reset signal (RESETn) comes from the IC 604-K18pin, ´H ´level (3.3V) in normal times, while ´L ´ (0V) at reset.
A built-in reset circuit inside IC 604 triggers a reset when the +5V power line voltage drop below 4.3V,or the 3.3V power line
voltage drop below 2.9V.
What to do when the system does not start up after the power is turned ON.
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							7.3.5. ANALOG SECTION
7.3.5.1. ANALOG GATE ARRAY (IC201 on the Digital Board))
This IC can perform signal route switching and level adjustments for various types of analog signals.
This IC incorporates a cross-point switch (CPS), an electronic volume.
The CPS of this IC is controlled by sending data from digital ASIC.
Explanation of ANALOG GATE ARRAY (IC201 on the DIGITAL Board)
No.NameFunctionNo.NameFunction
1STRStrobe input19NCNot used
2CLOCKClock input20EXTINExt amp output
3DATAData input21EXTOUTExt amp input
4VDDLogic power supply22LINEOUTLine amp output
5VOXOUTVOX output23LINEINLine amp input
6VOXDETVOX detection adjustment24MODEMTXINMODEM TX amp input
7VOXINVOX input25MODEMTXOUTMODEM TX amp output
8VSSLogic ground26NCNot used
9NCNot used27TONEINTone amp input
10ROUT2HS receiver amp output 228NCNot used
11ROUT1HS receiver amp output 129NCNot used
12RINHS receiver amp input30GNDAnalog ground
13VCCAnalog ground31MODEMRXOUTMODEM RX amp output
14HSMICIN1HS mic amp input 132VLINVolume amp input
15HSMICIN2HS mic amp input 233VREFReference voltage output
16HSMICOUTHS mic amp output34VLOUTVolume amp output
17NCNot used35SPOUTSpeaker amp output
18NCNot used36SPINSpeaker amp input
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