Panasonic KX-F1200 Service Manual And Technical Manual page 115

i KX-ri200
[Film End Sensor (PS901)]
This sensor detects empty ink films by using a reflective type sensor. Normally the ink film coating (color) is black.
When the film is almost empty, a silver colored band will appear on the sensor area.
When film empty is detected, the black and silver level on this sensor is digital data in the A/D converter of the CPU (IC401).
It is necessary to record the black standard level into the memory beforehand. When you're changed the digital board and
film end board, it is necessary to perform the resetting.
The reset method is to set the ink film black part. (While feeding the ink film, change the setting. You must have enough
space for the black part.) Once in the service mode, press #9000, * ,#802, then START button. The setting is complete.
.,, CPU
CN901 CN411 I I I
I
1[-'-_1 / I ,. 631 IMT_ I
_" I ..... I
' 4-_-_- -I-, _ Operation Board
i V L_ ',PS901
'--_!_-/- - ' Empty
\1 FILM NO Empty
)
Silver Colored
Band
J)
Photocopier Signal (IC401-63 pin)
ON Low level
OFF High level
4. MODEM SECTION
4-1. FUNCTION
The unit uses a 1 chipmodem(IC405), enabling it to act as an interfacebetween the controlsectionfor FAX sendingand re-
ceiving,and the telephoneline. During a sendingoperation,the digitalimagesignalsare modulated and sent to the tele-
phone line,whileduringa receivingoperation,the analog imagesignalswhichare receivedvia the telephonelineare de-
modulatedand convertedintodigitalimage signals.The communication format and proceduresfor FAX communication are
standardizedby ITU-T (CCITT). This 1 chipmodem (IC405) has hardwarewhichsends and detectsall of the necessarysig-
nals for FAX communication.
It can be controlledby writingcommandsfrom theCPU (IC401) to the registerin the modem (IC405).
Thismodem (IC405) also sendsDTMF signals,generatesa call tone (fromthe speaker),and detects a busy tone and dial
tones.
Overview of Facsimile Communication Procedures [ITU-T (CCITT) Recommendation]:
1) ON ITU-T (CCITT) (International Telecommunications Union)
The No. XIV Group of ITU-T (CCITT), one of the four permanent organizations of the International Telecommunications
Union (ITU), investigates and make recommendations on international standards for facsimile.
2) Definition of Each Group
• Group I (G1)
A-4 size documents official without using formats which reduce the band width of signal sent over telephone lines.
Determined in 1968.
Transmission for about 6 minutes at scanning line density of 3.85 lines/mm.
• Group ]] (G2)
Using reduction technology in the modulation/demodulation format, A-4 size document is sent at an official scanning line
density of 3.85 lines/ram for about 3 minutes.
Methods to suppress redunOancy are not use_.
Oeterm'_ued _n 1976.
• Group n] (G3)
Method of suppressing redundancy in the image signal prior to modulation is used. A-4 size document
_s sent within
about one minute.
Determined in 1980.
• Group ]V (G4)
_'ransm'lss'\or_ \ s "_\_._t.& _ebNork. Method is #rovided for suppressing redundancy in signals prior to transmission, and
error-free reception of transmission is possible.
The scope of these facsimile applications iS not limited simply tO tt'aflsm/_)or/ot writI#n #tatements. -rhr°u9_ symb, o,,°
linkages with other communications methods, it can be expected to expand to include integrated services.
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