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CITIZEN
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CBM-710
User Manual
69 pgs1.42 Mb0
Table of contents
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CITIZEN CBM-710 User Manual

Service Manual
DOT MATRIX PRINTER
MODEL
Rev.1.00 Newly issued on Mar, 1989
CBM-710/720
CONTENTS
Chapter 1. Printer Disassembly and Assembly ....................................................................................... 1
4 How to Remove the Power Board and AC power Unit ................................................................................4
6 How to Remove the Operation Panel and PE Sensor ................................................................................... 5
Chapter 2. Circuit Description ................................................................................................................. 6
1 Outline .......................................................................................................................................................... 7
3 Printer Control Circuit ................................................................................................................................ 10
5 Interface and Operation Panel..................................................................................................................... 12
6 Paper End Sensor Circuit ............................................................................................................................ 13
7 Parallel Interface Circuit ............................................................................................................................. 14
8 Serial Interface Circuit................................................................................................................................ 16
9 RS422A interface Circuit............................................................................................................................ 18
10 Power Supply Circuit.................................................................................................................................. 19
Chapter 3. Auto Cutter ........................................................................................................................... 20
1 Maintenance and Handling ......................................................................................................................... 21
2 Mechanism and Principle of Operation ...................................................................................................... 22
3 Repairing and Troubleshooting................................................................................................................... 24
4 Disassembly and Assembly ........................................................................................................................ 26
Chapter 4. Circuit Diagram.................................................................................................................... 28
1 Power Supply Circuit.................................................................................................................................. 29
2 Noise Filter Circuit ..................................................................................................................................... 30
3 Operation Panel Circuit .............................................................................................................................. 30
4 Paper End Sensor Circuit ............................................................................................................................ 30
5 OP Junction Circuit..................................................................................................................................... 31
6 Parallel ........................................................................................................................................................ 32
7 RS232C ....................................................................................................................................................... 33
8 PS422A ....................................................................................................................................................... 34
Chapter 5. Parts List ............................................................................................................................... 35
1 Exploded View............................................................................................................................................ 36
2 Block Diagram ............................................................................................................................................ 41
3 Power Supply Unit...................................................................................................................................... 43
4 Noise Filter Unit ......................................................................................................................................... 45
5 Control Board Unit: RS232C...................................................................................................................... 47
6 Control Board Unit: Parallel ....................................................................................................................... 51
7 Control Board Unit: RS422A ..................................................................................................................... 55
8 OP Panel/PE Detector/OP Junction Unit .................................................................................................... 59
9 Auto Cutter ................................................................................................................................................. 63
10 Winder......................................................................................................................................................... 67
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CBM-710/720 Service Manual
Chapter 1
Printer Disassebly and Assembly
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CBM-710/720 Service Manual
1. How to the Upper Cover and Rear Cover
1) Unfasten 4 screws (M3 x 6) as shown in the figure and lift the upper cover upward, while disconnecting the connector.
2) Unfasten 4 screws (M3 x 6) at both sides and remove the rear cover.
Upper Cover
Connector
Rear Cover
2
2. How to Remove the Printer Mechanism
• Remove the upper cover.
• Unfasten 2 screws (M3 x 14) as shown in
the figure.
• Lift the printer mechanism in the arrow
position for removal.
Printer Mechanism
CBM-710/720 Service Manual
3. How to Remove the Control Board
• Remove the rear cover.
• Disconnect each connector.
• Unfasten 4 pieces of board mounting screws
for removal of the control board.
Control Board
3
4. How to Remove the Power Board and AC Power Unit
1) How to Remove the Power Board
• Disconnect 2 connectors.
• Unfasten 2 screws (M3 x 8) and 2 tapping screws (M3 x 8).
• Remove the board, paying attention to the lead wire.
2) How to Remove the AC Power Unit
• Unfasten 2 inlet set screws (M3 x 10) and an earth wire mounting screw (M4 x 6).
• Unfasten 2 noise filter plate mounting screws (M3 x 6).
• Unfasten 4 power transformer mounting screws (M4 x 6).
• Disconnect the connector at the secondary side of the power transformer and take away the entire unit.
CBM-710/720 Service Manual
Noise Filter Plate
Inlet
Po wer Transformer
Power Board
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CBM-710/720 Service Manual
5. How to Remove the Auto Cutter Unit (720)
• Remove the printer mechanism from the main body.
• Remove 2 E3’s as shown in the figure.
• Pull out the shaft in the arrow direction for removal of the auto cutter unit. (Note that 2 spacers come off at the
same time).
Auto Cutter Unit
Spacer
Printer Mechanism
6. How to Remove the Operation Panel Board and PE Sensor Board
• Remove the upper cover and unfasten 2 tapping screws for removal of the operation panel board.
• Remove the printer mechanism and unfasten a screw for removal of the PE sensor board assembled with the PE
sensor holder. To remove the board only, remove the lug of the PE sensor holder.
Lug
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CBM-710/720 Service Manual
Chapter 2
Circuit Description
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CBM-710/720 Service Manual
1. Outline
A block diagram of this printer is shown in Fig. 1-1. It consists of the control circuit centered around CPU, ROM, RAM and peripheral circuits, interface circuit for interfacing with each host computer, operator panel circuit for operating switch input and LED display, printer mechanism, auto cutter, and power circuit for furnishing power supply to each part.
Fig. 1-1 Block Diagram
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2. CPU Peripheral Circuits
1) CPU and ROM/RAM The CPU M50734SP has a external memory type. Lower 8-bit address is fetched via the A0/D0 bus line by the 8-bit latch LS373. The 128-KB ROM and 64-KB RAM are used for performing the backup operation for power failure by the super capacitor. The ceramic oscillator is used as CPU clock and transmits 7.37 MHz.
CBM-710/720 Service Manual
Fig. 2-1 CPU and ROM/RAM Circuit
2) Initial Resetting and Power Failure Interrupt Circuit The IC12 is an IC for generating the power failure interrupt signal and reset signal. When the power supply voltage decreased due to power failure, etc. this IC performs the voltage inspection and stores all data in the CPU buffer into RAM while printing.
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CBM-710/720 Service Manual
As can be seen in the timing chart, it detects that Vcc decreased up to about 4.5 V for power failure and generates the power failure interrupt signal and sends it to CPU. Upon receipt of the signal, CPU transmits the data in its buffer to RAM. This processing is done within about 200 µs. After about 1 ms, the reset signal is generated at IC12 and given to CPU, etc., causing all circuits to reset for prevention of explosive running. When the power supply is turned on, reset is released after Vcc increases up to 4.5 V or more and then initial setting is performed. The WD terminal of CPU is called “Watch Dog”, which is the output terminal used for explosive running.
Super Capacitor 0.047F
External Reset Input (To interface circuit)
Fig. 2-2 Power Failure Interrupt Circuit and Initial Resetting
4.5V
Vcc (5V)
INT
(Power Failure Interrupt)
Reset
About 1ms
4.5V
Power failure interrupt signal generated
About 1ms (Data stored)
Fig. 2-3 Timing Chart
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CBM-710/720 Service Manual
3. Printer Control Circuit
1) When L is output to the CPU port P31, the motor rotates and a timing pulse appears at the DP terminal of CN5.
2) After rotation of the motor, printing starts in timing at which the port P34 is changed into L from H by the home pulse of the printer.
3) In 9 ports of CPU output ports P20 to 27 and P30, the L pulse is output to the necessary port. Electricity is applied once to the DOT solenoid for two timing pulses and characters are printed.
4) The paper is fed when the CPU port P33 becomes L in the specified timing.
5) Color is changed when the CPU port P32 becomes L in the specified timing.
PrinterPrinter
Operation Panel
CN6
Winder
Fig. 3-1. Printer Control Circuit
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4. Cutter Control Circuit
Cutter Side
CBM-710/720 Service Manual
X
Y
S
Fig. 4-1 Cutter Control Circuit
The cutter control circuit is as shown in Fig. 4-1. In the cutter side, M indicates the motor and S the home switch. The motor can make forward and reverse rotation by controlling X and Y inputs of the control circuit as shown in the table below.
Normal
Reverse Stop Stop
HLLHX
LHLHY
The timing chart is provided in Fig. 4-2. The rising of S when the motor makes forward rotation is the home position, where the motor stops. For full cut, the blade returns to the home position with only forward rotation of the motor after turn-around. For partial cut, on the way of cut after forward rotation of the motor, make reverse rotation to return the blade. Then stop the blade at the home position by making forward rotation again.
1) Full Cut 2) Partial Cut
1 mS 1 mS
X
X
Y
S
Fig. 4-2 Timing Chart
Y
S
15 mS
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CBM-710/720 Service Manual
5. Interface with Operation Panel
As shown in Fig. 5-1, the operation panel circuit has the on-line switch and line feed switch. Each switch is connected to CPU input ports and each LED is connected through the driver to CPU output ports.
Control circuit
Operation Panel Circuit
Vcc
LED1
LED2
LED3
SW1
SW2
POWER
ON-LINE
ALARM
ON-LINE
FEED
R1
R2
R3
Fig. 5-1 Operation Panel Circuit
CPU
P04
P05
P35
P36
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CBM-710/720 Service Manual
6. Paper End Sensor Circuit
Fig. 6-1 shows the paper end sensor circuit. The reflection type photo-interrupter is used as a sensor. When some paper is still left, the light reflected by paper strikes upon the photo-transistor; thus, the collector of the photo­transistor is L. When paper becomes short, no light is reflected, causing the collector to go H. As a result, the CPU input port P40 becomes H, going into the paper end state.
Control Circuit
Paper End Sensor
PHI 1
R12
R13
C11
R14
Fig. 6-1 Paper End Sensor Circuit
Vcc
R15
Tr3
CPU
P40
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CBM-710/720 Service Manual
7. Parallel Interface Circuit
This circuit conforms to the standard interface. Description will be made for each signal of interface connector as follows. Fig. 7-1 shows the data input and print timing chart and Fig. 7-2 the parallel interface circuit diagram.
DATA (D1~D8) : 8-bit parallel signal (Positive logic) STB : Strobe signal for reading 8-bit data (Negative logic) RESET : Signal for resetting the printer (Negative logic) ACK : Data request signal to be output at the end of BUSY signal (Negative logic) BUSY : Signal for indicating if the printer is in the busy state; it goes into the busy state for H. (Positive
logic)
FAULT : Signal to be output when the printer is in the abnormal state; at this time all control circuits in
the printer stop. (Negative logic) PE : Signal to be output when the print paper becomes short (Positive logic) FG : Frame ground
Fig. 7-1 Data Input and Print Timing Chart
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Vcc
R15
IC10
7406
33k
IC1
50734SP
CBM-710/720 Service Manual
RA5
16P
CN3
CN2
IC137406
12-33kΩ
Fig. 7-2. Parallel Interface Circuit
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CBM-710/720 Service Manual
8. Serial Interface Circuit
As the serial interface specification, RS-232C and 20 mA current loop can be switched by the slide switch. It can be switched by the user although fixed by setting at delivery time.
1) RS-232C
By using MAX232C for data receiving (RD), data transmitting and BUSY (DTR), data is transmitted and received at level of RS-232C. The baud rates of 110 to 9600 bps can be selected by switching the DIP switch.
2) 20 mA Current Loop
The photo coupler is used for transmitting and receiving. The photo coupler LED is used for receiving data and the photo transistor for transmitting data.
3) DIP Switch Reading
The baud rate, word length, parity check, parity condition are set by the DTP switch.
4) Positive/Negative Power Supply for RS-232C
±12 V power supply is required for obtaining RS-232C voltage level. In this printer, however, as IC MAX232C for interface is used, ±12 V is generated at the power circuit built in IC. Thus, no other power supply is required.
The serial interface circuit diagram is shown in Fig. 8-1.
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CBM-710/720 Service Manual
Fig. 8-1 Serial Interface Circuit Diagram
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CBM-710/720 Service Manual
9. RS422A Interface Circuit
The RS422A interface circuit diagram is shown in Fig. 9-1. As can be seen in the figure, when TXD CONTROL is L, the line driver IC14 becomes enable, going into the ready-to-receive state. At this time, the line receiver IC15 becomes disable. When TXD CONTROL is H, IC14 becomes disable, while IC15 becomes enable, going into the ready-to-receive state. Communication is actually made through 2 lines although usually done through 4 lines (including GND FG). These 2 lines are used for both transmitting and receiving of data.
TXD CONTROL
TXD
RXD
Fig. 9-1 RS422A Interface Circuit
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CBM-710/720 Service Manual
10. Power Circuit
This power circuit supplies DC 5 V for the control circuit and DC 24 V for driving the printer mechanism. When the POWER switch is turned on, the AC voltage is applied to the transformer T after noise is eliminated by the capacitors C1 to C4 and noise filter NF. For the secondary voltage of transformer, all waveforms are rectified at both the DC 5 V side and DC 24 V side. IC1 indicates the regulator IC and Tr1 the current boosting transistor which can generate DC 24 V constantly. The constant voltage can be obtained by the diode connected to the base side of Tr3 and Zener diode, while DC 5 V can be obtained by the Darlington-connected transistor Tr2 for current boost. The diode D5 also serves as temperature compensation.
Fig. 10-1. Power Supply Circuit
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