Mita-Kyocera FS5900C Electrical Circuit Description
6. Electrical Circuit Description
6.3 Basic engine functions
This section presents a general functional overview of the engine system of the printer. It was intended to
provide a comprehensive knowledge on basic functions that the engine system performs during printing.
The following printer functions are covered:
• Engine controller system
• Main logic controller system
• Paper feed system
• Power supply system
6.4 Engine controller system
The engine controller provides control over all print engine activities. It drives laser depending on the video
data transmitted from the main controller, provides control over the devices for paper transportation, such
as motors, clutches, solenoids, the heater lamp, the eraser, etc., and collects information given by the sensors.
The engine controller is also responsible for the following systems, explained step by step through the following pages:
6.4.1 Configuration memory
The engine controller us es a fl ash me mory to st ore the user-selected parame te rs f or confi gurin g th e pri nt er.
The flash memory is driven by +5 V power and designed to stand rewriting operations of at least 100,000
times at an identical address.
6.4.2 High-voltage generator
The engine controller produces clocks (HVCLK1 and HVCLK2) and apply programmed divisor to generate
high-voltage outputs for main charging. The clock oscillation can be toggled on and off by the engine controller CPU.
The engine controller generates analog outputs that control the high voltage potential generated by the
high voltage unit. The high voltages unit uses the combination of this analog output and an on/off control
signal to control its generation of the high voltage o utput.
6.4.3 Laser scanner control
In order to activate the laser scanner, the engine controller does the following tasks:
• Generation of laser timing
• Polygon motor activation (start-up and stabilized states)
• Monitoring laser beam paths
6.4.4 Polygon motor control
The output frequency signal to the polygon motor is generated by the engine gate array as it divi des the
engine system clock (18.0762 5 MHz).
The revolution of the polygon motor (N) = 10*f, where f is the clock frequency (2519.7 Hz) = 25,197 rpm.
As the laser beam reaches the beam detector sensor, the sensor board generates the horizontal synchro sig-
nal (NBDLD*). This signal makes the engine gate array consequently turn the video output signal (N
VIDEO*) and the APC signal (NADJUST*) low which respectively activate the laser light and the APC controller.
The engine CPU attempts to detect the horizontal synchronization signal so that the laser diode is normally
triggered. If the horizontal synchronization output is not found after the laser driving current control (N
ENABLE*) is set low, the engine CPU reco gni zes it as th e fail ure on the laser driver b oar d and gi ves the E 3
error.
6.5 Safety interlock
For safety purpose, and in order for the product to conform to the safety standards required by the U.S.
FDA and several European regulations (IEC 825), the printer is facilitated with safety interlock. Safety
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FS-5900C Service Manual
interlock is provided by microswitches that work in conjunction with the right side cover, left side cover, and
front covers.
If either of these covers is open, the 24V DC input is cut off except at the following areas, ceasing the laser
emission in LSU:
•PSU fan
• Fuser/toner developers fan
• IC29 (Vcc), IC30 reference voltage controller
Those circuits including the fan motor drivers, high voltage controller, and the fuser controller are deacti-
vated.
The laser emission is also deactivated while the imaging unit is removed from the printer for maintenance,
etc., because the 5V DC input for the la ser driver board i s cut off. If the either of the covers mentioned above
is opened during the imaging unit is remov ed from the printe r, the enable signal from the laser diode driver
is automatically disabled by means of software.
6.5.1 The engine gate array
The engine gate array is a supplementary device to the engine CPU. It is a 208-pin CMOS-type QFP type
that has the internal blocks of function ality as shown below.
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6. Electrical Circuit Description
Gate Array (IC3 )
IC3 serves in the major functions of the printer engine. Pins and their definitions for this gate array is diagrammed as follows.
Gate Arra
(IC3)
Address (Low) A7-0 VCLK16 Video Clock
CPU Interface
Toner Empty Sensor
Power Supply Unit
Toner Developer Drive
Motor (Sleeve Motor)
Toner Developer
Toner Developer Selector/
Paper Eject Unit
Paper
Feed Unit
Duplex
Dta/Address (Low) D7-0 VD3-0 Video Data
Address (High) A16-8 HSZ
Read RD VSZ
Write WR
Address Strobe ASTB UPSZ2-0 Cassette Detection Sensor
Vertical Interrupt INTVS UPEMP Cassette Empty
Horizontal Interrupt INTHS
SRAM Chip Selec t CSWSRAM CLBPS Cleaning Blade Posittion
Program ROM Chip Select CSPROM
Left Side Door Open DOPNPF MMCLK Extemal Clock
Front Cover Open DOPNFR MMP/S Motor Start/Stop
Toner Empty Detection Signal B(C,M,Y)TECLK
Toner Empty Sensor Control B(C,M,Y)TECTL CHGNOT No Charger
System Clock VCLK64
Reset RS T HVLD Data Load
Fuser Lamp Control FSRCTL HVDATA Data
Motor Start/Stop SLMP/S STRCTL Second Transfer Voltafe Control
Extemal Clock SLMCLK FTRCTL First Transfer Control
Main Motor Speed
Detection Signal
Drive Unit
Fuser Fan
Fuser Unit
Paper Feed Motor
M.P.T Pickup Roller Movement Sensor MPPKUP
Sleeve Clutch Control B(C,M,Y)SLVCTL HPS Transfer Roll Postition
Fuser Fan Error CFMDERR
Fuser fan Control CFMDCTL OPS OPC Postion
Thermistor Open THOPNCK ERSCTL Eraser LED Control
Temperature High THHIGHCK
No Fuser FSRNOT OZMCTL Ozon Fan Control
Motor Start/Stop FMP/S
Extemal Clock FMCLK VIDEO Video Data
Main Motor Speed
Detection Signal
Toner Developer Sensor Signal B(C,M,Y)CMPS PSEL Laser Power Select
Cam Motor Drive Signal B(C,M, Y)CMCTL BDLD B ea m Detect
Paper Ejection/Exit Sensor EXITSEN 1, 2
Output Paper Tray Sensor EXITFULL SCNCTL Control Signa l
Switchback Solenoid Drive Signal FUDCTL SCNCLK Extemal Clock Signal
Duplex Solenoid Power Coltrol DPXSOL 1
Solenoid Power SOLPWR SCNLK Lock Detection Signal
Paper Detection Signal MPPSEN CFMPERR PSU Fan Error
M.P.T Paper Feed Motor MPNA PTLCTL Pre-transfer LED Control
Drive Signals MPB
Transfer Roller Control TRUDCTL OPSCLK Serial Clock Signal
Registration Roller Control RE GCTL OPSLD Data Load Signal
Pickup Control UPUCTL OPMCTL Option Paper Feeder Motor Control
No Paper Feeder Unit PFUNOT PFMSET 1 Option Feeder Motor Speed Control
Transfer Roller Cam Sensor TRRPS 01PCTL Upper Option Cassette Pick Up Con-
Paper Empty Sensor UPNOT 02PCTL Lower Option Cassette Pick Up Con-
Registration Sensor REGSEN
Duplex Top Sensor TOPSEN
Duplex JAM Sensor DJAMSEN
Duplex Fan Control DPXFAN
Duplex On Control DPXUON
Duplex Off Control DPXUOFF
Duplex Fan Error DPXFNS
SLMLD STRSEL Second Transfer Contro l Select
FMLD ENABLE Laser Enable
MPA
MPNB OPSRDD 0, 1 Serial Data Signal
CLBCTL Cleaning Blade Control
MMLD Main Motor Speed Detection Signal
HVERR High Voltage Error
HVCLK Cl ock
DEVCTL Development Bias Control
CHGCTL Scorotron Charger Control
CIKNOT Color Imaging Uni t Detection Signal
OZMERR Ozon Fan Error
ADJUST Laser Power Adjust
Print Control
trol
trol
Video Interface
Voltage Control
Ozon Fan
Cassette
Cleaning Blade
Erraser
Laser Scanning
Unit
Polygon Motor
PTL
Main Motor
High Voltage
Unit
Accumulator B el t home
Detecting Signal
Option Paper
Feeder
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FS-5900C Service Manual
Pin assignment
Pin assignment for the engine gate array is table on the followi ng pages. The device in Remarks column
means those which the signal is forwarded to.
Note that only the pins with meaningful assignment ar e shown below and those for the power line and
ground are excluded.
Engin Gate Array Pin Asignment
Pin No Name I/O Description Termination
1GND
2GND
3 NVCLK16 O Video Clock
4 OPIN0 I GND
5OPOUT16 O Open
6 OPIN1 I GND
7NVD0 I Video Data 0
8 OPIN2 I GND
9NVD1 I Video Data 1
10 OPIN3 I GND
11 NVD2 I Video Data 2
12 OPIN4 I GND
13 NVD3 I Video Data 3
14 UPSZ0 I Default Cassette Size Detection
15 UPSZ1 I Default Cassette Size Detection
16 UPSZ2 I Default Cassette Size Detection
17 UPEMP I GND
18 ITCM O Open
19 CLBPS I Int. Transfer Cleaning
20 NMMLD I Main Motor Lock Detection
21 MMPS O Main Motor Start Pulse
22 MMCLK O Main Motor Clock Output
23 CHGNOT I Charger Installation Detection
24 HVERR I HV error status
25 NHPS I Int. Transfer Home Position Detection
26 GND
27 Vdd
28 OPS I OPC Home Position Detect
29 SLSTPB I Pull-up
30 ERSCTL O Discharger Control
31 HVLD O D/A Data Load (High Voltage Unit)
32 NHVCLK O D/A Shift Clock (High Volta ge Unit)
33 HVDATA O D/A Serial Data Output (High Voltage Unit)
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6. Electrical Circuit Description
Pin No Name I/O Description Termination
34 PSPSEL O Open
35 FTRSEL O Open
36 DEVCTL O Dev. Bias Control
37 STRCTL O Second Transfer Bias
38 FTRCTL O First Transfer Bias
39 STRSEL O Second Transfer Bias Select
40 CHGCTL O Charger Output Control
41 OPOUT1 O Open
42 NCIKNOT I CIK Installation Detect
43 OZMERR I Ozone Fan Error
44 OZMCTL O Ozone Fan Control
45 OPOUT2 O Open
46 OPOUT3 O Open
47 OPOUT0 O Open
48 OPIN5 I Duplex Top Sensor
49 OPIN6 I Duplex Jam Detect
50 NVIDEO O NVIDEO
51 GND
52 GND
53 Vdd
54 NC
55 ENABLE O Laser-on Enable
56 ADJUST O Laser APC
57 NPSEL O Laser Output Select
58 OPOUT4 O Sensor Power Control
59 OPOUT5 O PSU Fan Control
60 OPOUT6 O Not Used
61 OPOUT7 O Duplex Fan Control
62 OPOUT8 O Duplex ON Control
63 OPOUT9 O Duplex OFF Control
64 OPOUT10 O Open
65 OPOUT11 O Duplex Solenoid Contr ol
66 DIPSE0 I GND
67 DIPSE1 I GND
68 OPPUT12 O Open
69 OPOUT13 O Open
70 OPOUT14 O Open
71 CFMPERR I PSU Fan Error
72 NMANUSEN I GND
73 CTECLK I Cyan Toner Gauge (Reception)
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FS-5900C Service Manual
Pin No Name I/O Description Termination
74 BTECLK I Black Toner Gauge (Reception)
75 YTECLK I Yellow Toner Gauge (Reception)
76 MTECLK I Magenta Toner Gauge (Reception)
77 OPOUT15 O Not Used
78 Vdd
79 GND
80 VCLK64 I Base Oscillation Clock Input
81 OPIN7 I Duplex Fan Error
82 NCTECTL O Cyan Toner Gauge (Emitter)
83 NMTECTL O Magenta Toner Gauge (Emitter)
84 NYTECTL O Yellow Toner Gauge (Emitter)
85 NBTECTL O Black Toner Gauge (Emitter)
86 LCDE O Not Used
87 NLEDSET O Not Used
88 LCDRS O Not Used
89 NKEYRD Not Used
90 24VCTL O Not Used
91 DOPNFR I Front Door Status Detection
92 DOPNPF I Left Door Status Detection
93 NCSPROM O Program ROM Chip Select
94 OPIN8 I CIK Charger Detection
95 NFSRCTL O Fuser Control
96 OPIN9 I GND
97 NBOLD I HSYNC Detection
98 OPIN10 I GND
99 NSCNLK I Scanner Motor Lock Detection
100 SCNCTL O Scanner Motor Control
101 OPIN11 I GND
102 SCNCLK O Sca nner Motor Clock Output
103 NC
104 Vdd
105 GND
106 GND
107 A0 O Address 0
108 D0 1 O Data 0
109 SLMP/S O Sleeve Motor Control
110 NSLMLD I O Sleeve Motor Lock Detection
111 SLMCLK I O Sleeve Motor Clock Output
112 CSLVCTL I O Cyan Clutch Control
113 YSLVCTL I O Y ellow Clutch Control
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