Oki 3320 - Manuals

1 – 2 1.2 Options (1) Cut sheet feeder unit (CSF) (Narrow and wide versions available) Dual-bin CSF Single-bin CSF Attachment assy (2) Pull-tractor assy

2 – 1 2. THEORY OF OPERATION 2.1 Electrical Operation The electrical operation of the printer circuit is described in this section. 2.1.1 Summary Fig. 2-1 shows the block diagram of the printer. The control board is made up of the microprocessors, peripheral circuits, drive circuits, sensorsand inte...

2 – 7 2.1.3 Initialization This printer is initialized when the power is turned on or when the I-PRIME-N signal is inputfrom the host side via the parallel interface. For the initialize operation, the RST-N signal is first output from the reset circuit to reset theMPUs and LSIs. When resetting ends,...

2 – 8 2.1.4 Parallel Interface Control The parallel data input from the host to the interfaced LSI is latched to its internal register atthe falling edge of the STROBE-N signal. At the same time, the LSI sets the BUSY signal to the high level to inform the host that thedata is being processed, and o...

2 – 9 2.1.5 Print Control Print data is transmitted as parallel data (HEAD1~HEAD9) from LSI to print head. LSI generatesprint timing and drive time. HEAD DRIVE TIMING CHART DT1 DT2 HEADDRIVE CURRENT Print Data MPU LSI DRIVER HEAD1-N~HEAD9-N Print Data Print Head Control/Power Supply Board A/D bus HE...

2 – 13 (2) Encoder disk In the operation of the spacing motor, the PHASE-A and PHASE-B signals are generatedwhen the encoder disk interrupts the photo sensor. The LSI divides these edge pulse signals in accordance with the print pitch, and sendsthe IPT signal to provide dot-on timing and carriage po...

2 – 14 (3) LF motor control The LF motor driver (MTD2005F) drives the LF motor in two-phase or 1-2 phase bipolar,based on the phase changeover data and the output current data from the LSI. The data from the LSI is processed by a specific register contained in the LF motor driverto measure the overd...

2 – 15 2.1.7 Operation Panel The clock synchronization OPCLK of LSI is used to input the switch data and output the LEDdata through the operation panel control LSI (IC1: BU5148S). LSI OPTXD OPCLK OPCLR-N OPRXD 77 78 80 OPTD OPCK NPA2 OPRD Command and Data latch LED driver Switch controller +5V 79 A ...

2 – 20 2.2 Mechanical Operation 2.2.1 Printhead Mechanism and Operation (See Figure 2-2.) The printhead is a spring charged 9-pin driving head using a permanent magnet. It is attachedto the carriage, which moves in parallel with the platen. Electrically, this unit is connected tothe control circuits...

2 – 21 (2) Operation of printhead (See Figure 2-3.) (a) When the printhead is idle, the armature is attracted by a permanent magnet andthe spring fixing the armature is compressed. The print wires fixed to each armatureare thus concealed under the wire guide. (b) When a signal for a character to be ...

2 – 30 (1) Cut sheet and continuous sheet switching mechanism (See Figure 2-8.) Three different paper paths can be selected and set by the change lever. (a) TOP (for cut sheet) When the cut sheet is used in the manual mode or fed by the CSF (option), set thechange lever at the position marked TOP. [...

2 – 31 (c) BOTTOM (Continuous sheet from bottom feeder) (option) When the change lever is set in the BOTTOM position, the rotation of the platenis transmitted to the drive gear of the bottom tractor feed unit through the idle gearto feed the sheet which has been set in the bottom tractor feed. At th...

2 – 39 Figure 2-14 Change lever Release cam Platen Front releasegear arm TOP BOTTOM REAR

2 – 45 (2) When using the continouos paper 1) Set the change lever either to the rear side or the bottom side position. (See Figure2-17.) 2) Set a sheet of paper either to the push tractor or the bottom tractor. 3) Press the “FF/LOAD” switch. 4) The LF motor starts its operation to feed the paper up...

2 – 46 2.2.8 Paper Park Function (Continuous paper) Continuous sheets which have been inserted can be reversed automatically by using the “PARK”button on the operation panel. 1) Press the “PARK” button on the operation panel. 2) Reverse LF is started and paper is fed in reverse until paper end occur...

3 – 1 AC input plug AC receptacle AC cable Interface cable 3. ASSEMBLY/DISASSEMBLY This section explains the procedures for removing and installing various assemblies and unitsin the field. Description is mainly limited to the removal procedure; installation should basically be performedin the rever...

3 – 2 3.2 Service Tools Table 3.1 lists the tools necessary for replacing printed circuit boards and parts of units in thefield. Table 3.1 Service tools 1 No. 1-100 Phillips 1 Screws screwdriver 2.6 mm 2 No. 2-200 Phillips 1 Screws screwdriver 3-5 mm 3 No. 3-100 1 screwdriver 4 Spring hook 1 5 J-YX4...

3 – 3 Control/Powersupply board Upper cover assy Transformer assy Operation panel board Printhead Printer unit Driver board 3.3 Disassembly/Reassembly Procedure This section explains the assembly replacement procedures according to the following disassemblysystem. [Parts Layout] Figure 3-1 Printer u...

3 – 14 3.3.10 Backup Roller Holder Assy (1) Remove the printhead (see 3.3.1), (2) Remove the upper cover (see 3.3.4 (1) – (5)). (3) Remove the gear case Assy (see 3.3.5). (4) Remove the space motor (see 3.3.7). (5) Remove the backup roller spring 2 . Disengage claws (2 places) of roller holder from ...

4 – 1 4. ADJUSTMENT (1) Be sure to carry out this adjustment with the printer mechanism mounted on the lowercover. (2) Be sure to carry out this adjustment operation on a level and highly rigid work table(flatness: less than 0.039 inch or 1 mm) so as to minimize adjustment error.

5 – 1 5. CLEANING AND LUBRICATION 5.1 Cleaning [Cautions] 1. Be sure to turn OFF the AC POWER switch before cleaning. Remove the AC power cordfrom the printer. 2. Avoid dust inside the printer mechanism when cleaning. 3. If a lubricated part has been cleaned, be sure to apply lubricating oil to that...

5 – 3 5.2 Lubrication This printer is designed to be maintenance free and requires no lubrication during normaloperation. However it is necessary to apply lubricant in case the printer is disassembled,reassembled, cleaned or parts have been changed. (1) Cleaning time Remarks: 1) Turn off the power b...

5 – 7 6. Pressure roller Sliding portion of releaseshaft and change armEM-30L-A Change arm Release shaft Front pressure roller Support spring Controller holder Sliding portion of rear roller holder andrelease shaft cam surface (releaseshaft plane portion)EM-30L-A Bearing portion of front rollerholde...

6 – 1 6. TROUBLESHOOTING AND REPAIR 6.1 Items to Check Before Repair (1) Check the inspection items specified in the instruction manual. (2) Find out as many details of the trouble as possible from the customer. (3) Inspect in the conditions as close as possible to those at the time the trouble occu...

6 – 2 Note:BLINK1 : 400ms ON, 400ms OFFBLINK2 : 200ms ON, 200ms OFF— : LED is kept in Current Condition (no change) (2) Fault alram display When the printer detects any of the various alarm states, the information is displayed asshown below on the operation panel. The alarm is specified by lamp comb...

6 – 3 ALARM CATEGORY ALARM LED DISPLAY ALARM 10 12 15 17 20 PROP HSD UTL NLQ REMARKS TROUBLESHOOTING MAIN CONTROL ALARM FIRMWARE DETECTION ALARM SERIAL INTERFACE ALARM MPU internal RAM alarm Program ROM alarm RAM on Control Board alarm EEPROM alarm WDT (Watch Dog Timeout) alarm NMI signal alarm BRK ...

6 – 6 6.4 Connection Circuit Check for Printhead and SP/LF Motor (1) Printhead Signal Connector pin number CN1 1 #1 2 #2 3 #4 4 #6 5 #8 6 7 8 9 10 11 #9 12 #7 13 #5 14 #3 15 Thermistor HEAD1 HEAD2 HEAD4 HEAD6 HEAD8 EL HTEMP +40V +40V +40V HEAD9 HEAD7 HEAD5 HEAD3

6 – 9 6.5 Troubleshooting flow chart 1 Power is not supplied. Is the AC cable connected correctly? Yes No Connect the AC cable correctly. Is fuse F1 on the transformer assy/or F1 on the control/power supply board blown? No Yes Replace fuse (with same type and rating). Remedied? No Yes End Does DC + ...

APPENDIX A – 1 APPENDIX ABIT IMAGE GRAPH IS — DOT DENSITY (No adjacent dots allowed) 1/144 inch Double speedquad density Double speeddouble density Double Single D 1/60 inch DOT D/2 1/120 inch DOT D/2 1/120 inch DOT D/4 1/240 inch DOT D = 1/60 inch

A – 1 A. PCB LAYOUT PCB list (1) Circuit board SDCT (Control/Power Supply) (2) Circuit board SDDV (Driver) (3) Circuit board LEOP-3 (Operation Panel) (1) (2) (3)

B – 1 B. SPARE PARTS LIST Quantity per year: Indicates the recommended number of each part that should be ordered forroutine maintenance for one year for 500 units of printers and assuming that the printers areoperated for 2 hours/day of 600 hours/year. The following codes are used to indicate the n...

B – 4 Figure 11-2 Printer General Assy 6 9 8 2 7 4 5 3 10 1

B – 5 No. Part No. Description Q'ty Q'ty Remarks Required 1 2PP4025-2871P21 Platen Knob 1 1 2 4YA4042-1543G301 Control/power supply 1 9 For ODA board (SDCT) 4YA4042-1543G302 Control/power supply 1 9 For OEL board (SDCT) 4YA4042-1543G303 Control/power supply 1 9 For INT board (SDCT) 3 4YA4042-1549G1 ...

B – 6 Figure 11-3 Printer Unit 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 30 36 9 33 34 35 32 31 29

B – 9 Figure 11-4 Carriage Assy 12 9 8 6 14 11 10 1 13 7 5 4 3

B – 10 Figure 11-4 Carriage Option Assy No. Part No. Description Q'ty Q'ty Remarks Required 1 4PP4044-5061G1 Carriage frame set 1 2 2 3 4PA4025-3718G1 Back up roller holder assy 1 2 4 4PP4025-3398P1 Guide roller 1 2 5 3PP4044-5065P1 Guide roller holder 1 2 6 4YA4044-5100G1 Space motor assy 1 4 7 3PB...

B – 11 Figure 11-5 Option Spare Parts 1 2 3 4 5 6 7 [Pull-Tractor] [Bottom-Tractor] [I/F Board]

C – 2 2. OPERATION DESCRIPTION 2.1 Element Description (1) 80C51 with MASK ROM An eight-bit microprocessor controller that controls the following: (a.) Serial interface protocol and data transfer through a serial port. (b.) Message buffer. (c.) Transmission of parallel data to the printer. (2) SN751...

C – 4 2.2.1 Operation at power on After power is turned on, an RST OUT signal is sent from the printer control board to reset theprinter. When the reset is canceled, the 80C51 CPU performs initialization. Initialization consistsof setting the 80C51 timer, and setting the serial mode. 2.2.2. RS-232C ...

C – 5 Ready/Busy Received one character? Yes Is DSR valid? No Buffer overflow? Error? Parity error No error Store the received character in buffer. Is the printer in DESELECT state or is the paper low? No No Yes Yes No DSR High? Yes Store 40 H in buffer. Yes Yes No Yes Is remaining buffer space <...

C – 6 Figure C-2-3 X-ON, X-OFF Received one character? Yes Is DSR valid? No Buffer overflow? Error? Parity error No error Store the received character in buffer. Is the printer in DESELECT state or is the paper low? No No Yes Yes No DSR High? Yes Store 40 H in buffer. Yes Yes No Yes Is remaining buf...

C – 7 3. TROUBLESHOOTING FLOWCHART 3.1 Before Repairing a Fault Before servicing the printer, ask the customer in what situation the trouble occurred and recordthe response. Before starting troubleshooting, operate the printer in the same situation as that at the time oftrouble occurrence to see if ...

C – 11 3.3 Local Test 3.3.1 Circuit test mode 3.3.1.1 Setting (1) Diagnostic test (set by menu) (2) Test connector Connect the test connector shown in Figure C-3-6 to the interface connector Figure C-3-6 Test Connector Connection Diagram 3.3.1.2 Function After the settings outlined in Section 3.3.1....