CHAPTER 4
Electrical Description
4-1
Chapter 4 ELECTRICAL DESCRIPTION
4.1 CONNECTION DIAGRAM
4-2
+24V Power control signal
Heat lamp control
Thermistor connector check
Recording paper pick-up detect
RX Motor enable
RX Motor control B
RX Motor control A
Fan drive
A4 Size cassette detect
Letter size cassette detect
+24V Power supply
+24V Power supply
Temperature detect for heater lamp
Ground 24V
Recording paper empty detect
Ground 5V
Recording paper exit detect
Ground 5V
Printing data latch
+ 5V Power supply
LPH Strobe 3
+ 5V Power supply
LPH Printing clock
+ 12V Power supply
LPH Strobe 2
Ground 12V
LPH LTIN data
Ground 12V
LPH Strobe 1
-12V Power supply
LPH Strobe 0
+24V Power control signal
Ground 24V
Tonner exit detect
AC Motor drive A
AC Motor drive B
+ 24V Power supply
Paper feed clutch control
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
MAIN
PBA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
MOTHER
PBA
1
2
3
4
5
6
7
MAIN
PBA
1
2
3
4
5
6
7
CONNECTION
PBA
P60 P53
P2
P3
P12
P11
4-3
OPE Reset signal
RX Data from OPE
TX Data to OPE
CIS Scan signal output
Ground 5V
Speaker signal
+5V Power supply
Ground 12V
-12V Power supply
ClS Start pulse
+5V Power supply
Ground 5V
CIS LED +5V Power supply
Document scan position sensor output
Document scan position sensor +5V power supply
Not Used
+24V Power supply
TX Motor phase A
TX Motor phase /B
TX Motor phase B
TX Motor phase /A
Not Used
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
P1
MAIN
PBA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
P32
SCAN
PBA
+ 24V Power supply
Ground 24V
High voltage drive for transfer
High voltage drive for charge
Toner bias drive
1
2
3
4
5
P5
MAIN
PBA
1
2
3
4
5
H5
HVPS
4-4
+ 5V Power supply
TAD/External telephone off hook detect
Ring detect
Ground 5V
CML Relay control
Built in handset off hook detect
TX/RX Data
Not Used
Not Used
Not Used
Ground 12V
Not Used
+ 12V Power supply
- 12V Power supply
Remote tone signal
Volume control in
DP Control
Volume control out
TX Speech signal from handset
RX Speech signal to handset
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
P4
MAIN
PBA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
P7
LIU
PBA
+ 5V Power supply
Ground 5V
Ground 24V
Ground 24V
+ 24V Power supply
+ 24V Power supply
RX Motor enable
RX Motor control B
RX Motor control A
Fan drive
New OPC detect
1
2
3
4
5
6
7
8
9
10
11
P15
MOTHER
PBA
1
2
3
4
5
6
7
8
9
10
11
P16
MECH
PBA
4-5
AC Power (HOT)
AC Power (neutral)
+ 12V Power supply
Ground 12V
Ground 12V
+ 12V Power supply
+ 5V Power supply
+ 5V Power supply
+ 5V Power supply
+ 5V Power supply
Ground 5V
Ground 5V
Ground 5V
Ground 5V
Ground 24V
Ground 24V
Ground 24V
+ 24V Power supply
+ 24V Power supply
+24V Power supply
+ 24V Power control signal
Heat lamp control
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
P14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
P22
1
2
P45
MOTHER
PBA
1
2
P55
LIU
PBA
+ 24V Power control signal
Ground 24V
+ 24V Power supply
Paper feed clutch control
AC Motor drive A
AC Motor drive B
+ 24V Power supply
Ground 24V
Toner exit detect
1
2
P18
1
2
P19
1
2
P21
1
2
3
P49
MOTHER
PBA
1
2
H18
1
2
H19
COVER
SWITCH
PICK-UP
CLUTCH
1
2
H21
1
2
H49
AC
MOTOR
TONER
SENSOR
4-6
CIS Scan signal
Ground 5V
+ 5V Power supply
- 12V Power supply
Ground 5V
CIS Start pulse
Ground 5V
CIS Drive clock
Ground 5V
CIS LED + 5V Power supply
1
2
3
4
5
6
7
8
9
10
P33
1
2
3
4
5
6
P35
1
2
3
4
5
P34
+ 5V Power supply
Ground 5V
TX Data to OPE
OPE Reset signal
SCAN RX Data from OPE
+ 24V Power supply
TX Motor phase A
TX Motor phase B
TX Motor phase /A
TX Motor phase /B
+ 24V Power supply
Document scan position sensor output
Ground 5V
Document scan position sensor +5V Power supply
Document scan position sensor +5V Power supply
Speaker signal
Ground 12V
1
2
3
4
5
6
7
8
9
10
P38
1
2
3
4
5
P39
CIS
OP PBA
1
2
3
4
5
6
H42
1
2
3
4
H43
TX
MOTOR
DOCUMENT
SCAN
SENSOR
1
2
H37
SPEAKER
1
2
3
4
P36
1
2
P37
SCAN
PBA
4-7
+ 5V Power supply
+ 5V Power supply
ground 5V
ground 5V
Printing data latch
LPH Strobe 3
LPH Printing clock
LPH Strobe 2
LPD Printing data
LPH Strobe 1
Ground 5V
LPH Strobe 0
1
2
3
4
5
6
7
8
9
10
11
12
P33
1
2
3
P28
1
2
3
P27
+ 5V Power supply
Recording paper exit detect
Ground 5V
+ 5V Power supply
Recording paper exit detect
Ground 5 V
+ 5V Power supply
Recording paper pick-up detect
Ground 5V
1
2
3
4
P30
1
2
3
4
5
6
7
8
P31
1
2
3
H27
LPH
PAPER
EXIT
SENSOR
1
2
3
H28
1
2
3
H29
PAPER
EMPTY
SENSOR
PICK-UP
SENSOR
1
2
3
P29
SENSOR
PBA
4-8
4.2 INTER-UNIT SIGNAL DIAGRAM
CONNECTlON
SYMBOL Main Mother DESCRIPTION
P2 P12
+ 24V 1, 2 1,2 + 24V power supply
GND24 3, 5 3, 5 Ground 24
THERM IN 4 4 Temperature detect for Head Lamp
P_EMPTY 6 6 Recording paper empty detect
GND5 7, 9 7, 9 Ground5
P_EXIT 8 8 Recording paper exit detect
LPH_LA 10 10 Printing data latch
+ 5V 11, 13 11, 13 + 5V Power supply
LPH_STB3 12 12 LPH strobe 3
LPH_PCLK 14 14 LPH printing clock
+ 12V 15 15 + 12V power supply
LPH_STB2 16 16 LPH Strobe 2
GND12 17, 19 17, 19 Ground12
LPH_PDO 18 18 LPH Ltin data
LPH_STB1 20 20 LPH s~robe 1
-12V 21 21 -12V power supply
LPH_STSO 22 22 LPH Strobe 0
MAIN PBA MOTHER PBA
CONNECTlON
SYMBOL Main Mother DESCRIPTION
P3 P11
+ 24V CNT 1 1 + 24V power control signal
/FUSING ON 2 2 Heat lamp control
THERM_CONN 3 3 Thermister connect check
PICK_UP 4 4 Recording paper pick-up detect
RX_MOTOR_EN 5 5 RX Motor enable
RX B 6 6 RX Motor contorl B
RX A 7 7 PX Motor control A
/FAN_ON 8 8 Fan drive
A4_CAS 9 9 A4 size cassette detect
LTR_CAS 10 10 Letter size cassette detect
OPC 11 11 New OPC detect
MAIN PBA MOTHER PBA
4-9
MAIN PBA CONNECTION PBA
CONNECTlON
SYMBOL Main CONN. DESCRIPTION
P3 P11
+ 24V CNT 1 1 + 24V power control signal
GND 24 2 2 Heat lamp control
TONER 3 3 Thermister connect check
AC_A 4 4 Recording paper pick-up detect
AC_B 5 5 RX Motor enable
+ 24V 6 6 RX Motor contorl B
/CLUTCH_ON 7 7 PX Motor control A
CONNECTlON
SYMBOL Maln Mother DESCRIPTION
P13 P25
+ 5V 1-3 1-3 + 5V power supply
GND 5 4-6 4-6 Ground 5
PICK_UP 7 7 Recording paper pick-up detect
THERM_CONN 8 8 Thermister connect check
THERM_IN 9 9 Temperature detect for Heat Lamp
P_EMPTY 10 10 Recording paper empty detect
P_EXIT 11 11 Recording paper exit detect
LPH_LA 12 12 Printing data latch
LPH_STB3 13 13 LPH strobe 3
LPH_PCLK 14 14 LPH printing clock
LPH_STB2 15 15 LPH strobe 2
LPH_PD0 16 16 LPH printing data
LPH_STB1 17 17 LPH strobe 1
LPH_STB0 18 18 LPH strobe 0
MOTHER PBA SENSOR PBA
CONNECTlON
SYMBOL Main Mech. DESCRIPTION
P15 P16
+ 5V 1 1 + 5V power supply
GND 5 2 2 Ground 5
GND 24 3, 4 3, 4 Ground 24
+ 24V 5, 6 5, 6 + 24V power supply
RX_MOTOR_EN 7 7 RX Motor enable
RX B 8 8 RX Motor control A
RX A 9 9 RX Motor control B
/FAN_ON 10 10 Fan drive
OPC 11 11 New OPC detect
MOTHER PBA MECH. PBA
4-10
MOTHER PBA SMPS
CONNECTlON
SYMBOL Mother SMPS DESCRIPTION
P15 P16
- 12V 1 1 + 12V power supply
GND 12 2, 3 2, 3 Ground 5
+ 12V 4 4 + 12V power supply
+ 5V 5-8 5-8 + 5V power supply
GND 5 9-12 9-12 Ground 5
GND 24 13-15 13-15 Ground 24
+ 24V 16-18 16-18 + 24V power supply
+ 24V CNT 19 19 + 24V power control signal
/FUSING_ON 20 20 Heat lamp control
CONNECTlON
SYMBOL Mother SMPS DESCRIPTION
P45 P55
HOT 1 1 AC power
NEUTRAL 2 2 AC power
MOTHER PBA SMPS
CONNECTlON
SYMBOL Mother Power SW. DESCRIPTION
P50
HOT 1 AC power
NEUTRAL 2 AC power
MOTHER PBA POWER SWITCH
4-11
4.3 PRINTED BOARD ASSEMBLY VIEW
4.3.1 PRINTED BOARD ASSEMBLY LOCATION
4-12
4.4 PBA CIRCUIT DESCRIPTIONS
4.4.1 MAIN PBA
The Main PBA consists of six functional blocks. The functional blocks are:
•CPU
•Fax engine
•Memory
•Image processing
•AFE
•Telephone circuit
CPU
NS32FV164 is used as the control processor. This CPU executes the program instructions stored two 27c020
(256 kbyte x 2) EEPROMs and controls all system tasks that are to be preformed. The CPU stores the System
in 32 kbyte of SRAM. CPU clock is generated by the fax engine.
MEMORY
CPU uses two 256 kbyte EPROM (27C020), one 32 kbyte SRAM (62256) for system data and two 512 kbyte
DRAM (48C512X4) for working memory and pixel data.
FAX ENGINE
The uses NS32FX200-25 as a fax engine. It includes the bus controller, DMA controller, interrupt controller,
UART, general purpose 1/0 port, RTC, sigma delta codes, and DRAM controller. It also generates various
system control signal and 2 divided system clocks from an oscillator.
AS modem facility, It has modulator/demodulator for G3 mode, DTMF tone generator and tone detector.
The Msys5600/5700 can operate at speeds of 14000, 12000, 9600, 7200, 4800, 2400, and 300 bps. The
NS32FX200 satisfies the telecommunications requirements specified in CCITT recommendations V.17, V.29,
V.27ter, T.30, and T.4.
Its power is provided by a battery back-up circuit to retain RTC data.
IMAGE PROCESSING
Image processing consists of the image processor (STL7057) and SRAM (6264, 8kbyte). It has the following
functional blocks:
•A/D converter
•Edge emphasis
•Gray scale (error diffusion method
•AGC/ABC
•Generation of the CIS drive clock
A 8 MHz system clock is supplied.
64 kbyte
64 kbyte
256 kbyte
1 Mbyte
Working memory
ECM memory
OGM memory
Bit map memory
Pixel memory
Pixel memory
80 pages
14 pages
66 pages
4-13
AFE (Analog Front End)
The AFE consists of op amps (4558) and analog switches (4053). The Tx signal is transmitted from the
modem (N532FX200) to the LIU through the D/A converter and LPH.
The RX signal is received from the LIU to the modem through BPF and A/D converter.
TELEPHONE
The telephone circuit consists of op amps, and analog switches. The TEL Tx signal from the microphone in
the handset is transmitted to the dynamic unit of handset through BPF.
Off-hook is detected by mechanical switch in the handset cradle. The ring signal is generated by the TX
signal of modem.
4.4.2 OPE PBA
The Ope PBA consists of a micom, LCD, key matrix, LEDs, and a document detect sensor. Information about
which key is depressed, is passed through X and Y lines to the micom. The micom outputs a UART
(Universal Asynchronous Receiver and Transmitter) code for the depressed key or sensor's level to the main
PBA. Display data is transmitted to the micom by the controller on the main PBA and is sent to the LCD or
LEDs by the micom. This information will display the machine status on the LCD.
4.4.3 SCAN PBA
The scan PBA is placed on the bottom of the scan module which contains the CIS, Ope, P13A, TX motor,
scan sensors and a speaker. It passes the various signals from the scan module to the main PBA.
4.4.4 LIU PBA
The LIU PBA iS a llne interface unit. It has the line signal input and output, off-hook detection, ring
detection, DP dialer and TAD interface. It also contains protection elements to preserve fax system from llne
abnormalities such as surge, lightning, etc.
LINE SIGNAL
The line signal is sent from the transformer to the line through the CML relay. The line signal means TX/RX
data and MF/DP dial signal.
4-14
RING AND HOOK
There are two off-hook detecting circuits which are the handset off-hook detecting circuit and the TAD (or
external telephone) off-hook detecting circuit. The handset on-hook detecting circuit consists of a hook
switch on the hook PBA and resistors. The TAD off-hook detecting circuit contains a photo coupler. These
detecting signals are sent to the main PBA through a photocoupler, a capacitor and a resistor.
TONE DETECTING CIRCUIT
Tone detecting circuit consists of the transformer, capacitors and resistors. ThiS circuit detects the tone
which is sent from other fax machines or telephones.
4.4.5 MOTHER PBA
Mother PBA receives power from SMPS and distributes It to the other PBAS. It also contains the cassette size
detecting sensors.
4.4.6 CONNECTION PBA
Connection PBA delivers the signal of the cover switch, pick-up solenoid, AC motor, and toner sensor to the
main PBA.
4-15
4.4.7 MECH PBA
Mech PBA relays the signals of RX motor, Fan, and Fuse to the mother PBA.
4.4.8 SENSOR PBA
It is composed of various sensors SUCh as P.EXIT, P.EMPTY, PICK-UP and the thermistor. AISO the LPH
(LED print head) is connected to the sensor PBA.
4.4.9 HOOK PBA
Hook PBA generates a handset off-hook signal which is delivered to the main PBA through the LIU PBA. It
is placed in the cradle.
4.4.10 SMPS
The switching mode power supply unit supplies DC power of + 5V, + 12V, -12V, + 24V, and AC power of
110V for the heat lamp.
4.4.11 HVPS
The high voltage power supply unit provides 450 VDC bias voltage to the developer cartridge and 7000
VDC to the precharge and transfer coronas.
4-16
4.5 SENSORS
4.5.1 SENSORS LOCATION
4.5.2 SENSOR TABLE
Description Type Remark
COVER Upper cover open switch Snap action switch Active Low
DOC DETECT Document exit detect Photo interrupter Active Low
DOCUMENT SCAN Document scan position detect Photo interrupter Active Low
A4 CASSETTE
A4 size cassette detect
Photo interrupter Active Low
(or optional legal cassette detect)
LETTER CASSETTE Letter size cassette detect Photo interrupter Active Low
PAPER EXIT Recording paper exit detect Photo interrupter Active Low
PAPER EMPTY Recording paper empty detect Photo interrupter Active Low
PICK-UP Recording paper pick-up detect Photo interrupter Active Low
TONER Toner exit detect Magnetic induction Analog output
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