Oki MICROLINE ML320 Maintenance Manual
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Oki MICROLINE ML320 Maintenance Manual

Oki MICROLINE ML320 Maintenance Manual

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OKI MICROLINE ML320/321
MAINTENANCE MANAUL

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  • Page 1 OKI MICROLINE ML320/321 MAINTENANCE MANAUL...

  • Page 2: Specifications

    PREFACE This maintenance manual describes field maintenance of the MICROLINE 320/321 printer and options for maintenance engineers, For performance specifications and operating procedures, refer to the “User’s Manual”.
  • Page 3 TABLE OF CONTENTS CONFIGURATION ............. Standard Printer Configuration Options .
  • Page 4 ............Alarmcircuits 3.1.8 3-10...
  • Page 5 4-24 Carriageframe ............4-25 4.3.17 Spacerack...
  • Page 6 ............Operationatpoweron .
  • Page 7 1. CONFIGURATION...
  • Page 8 1 m CONFIGURATION 1 .I Standard Printer Configuration The standard configuration of the MICROLINE 320/321 is as follows. Power supply assembly Control Figure l-l Printer configuration l - l...
  • Page 9 1.2 Options Pull tractor feed unit with acoustic cover Cut-Sheet Feeder unit with access cover...

  • Page 211: Troubleshooting

    OKI MICROLINE ML320/321 TROUBLE SHOOTING MANUAL WITH COMPONENTS PARTS LIST...

  • Page 212: Table Of Contents

    CONTENTS Troubleshooting Manual 1. Outline ............l - l 2.

  • Page 213: Troubleshooting Manual

    TROUBLESHOOTING MANUAL...

  • Page 214: Outline

    4. Outline This troubleshooting flow chart is created for the purpose of repairing the ML320/321 printed circuit board assemblies. Those who are engaged in the repair work are expected to have an adequate level of experience and ability. Tools The following tools are required for ordinary repair work in addition to generally used tools. Osci I loscope Approximately 100 MHz Soldering iron...

  • Page 215: Operation

    ( 6 - 6 ) The TOF switch does not function. ( 6 - 8 ) The CHARACTER switch does not function, after the parallel interface data is received. 1 - 2...

  • Page 216: Transformer

    The connectors and parts mentioned in (l-1) to (Flare located on the power supply PC board (PAII or SUII). 1 emitter - The voltage between pins 4 and 5 of CN2 (OV) is 32V to 52 V? Yes The waveform of pin 2 of IC2 is as shown in Figure l? Figure 1 Replace IC2 or IC3.

  • Page 217: Powersupplyboard

    There is no + 8V output. The fuse Fl isopen? AC voltage is supplied to pins 3 and 6 of CNI? Replace the transformer. Note: The connectors and parts are located on the DC power supply board There is no + 8V output? Note: The connectors and parts are located on the DC power supply board The 1 OV AC is not output.
  • Page 218 T h e r e i s n o o u t p u t . The fuse on the filter board is open? Yes The signal is input to pin 12 of CN6? Yes The D102 cathode voltage is approximately Replace or TR109.
  • Page 219 The oscillation waveform of OSC is the same as shown in Figure 2? Figure 2 No Replace the OSC. Yes The RST signal on pin 4 of Q7 is the same as shown in Figure 3? + 5v Figure 3 The input waveforms on pins 8 and 9 of 46 are the same as shown in Figure 4? Yes Replace 46.
  • Page 220 Yes The ALE (pin 27), PSEN (pin 26), RD (pin 13) WR (pin 12) and BUS signals of Q7 are the same as shown in Figure 5? The signal level of the bus line should be stabilized to high or low level at the full of PSEN or at the rise of RDNVR.
  • Page 221 Internal CPU RAM error Replace 47. P r o g r a m R O M e r r o r Replace Q13. External RAM error The I?% (on pin 5), C% (on pin 16), E (on pin l), WR (on pin 4) of 48 and Q9, and AD O-7 and DRAM AO-7 are the same as shown in Figure 7? 625 ns 62.5...
  • Page 222 Serial interface error CN3 and the Serial interface board are properly connected? No Connect them properly. Yes Replace the Serial interface. The operation is now normal? S p a c i n g e r r o r The waveforms of SPU (pin 61), SPV (pin 62) and SPW (pin 63) of are the same as shown in Figure 9? Figure 9...
  • Page 223 The input waveforms of PHASE A (pin 80) and PHASE B (pin 81) of Qll are the same as shown in Figure lo? (Move the carriage manually if the operation is stopped.) PHASE PHASE B Figure 10 (The above diagram shows the timing during constant-speed operation.) Replace the carriage unit or CN2.
  • Page 224 The HEAD ON signal (on pin 82) of Ql 1 is the same as shown in Figure 1 l? HEAD ON T: Variable bflhe number of print pins Figure 11 Replace Qll when the HEAD ON signal is stable at high level. Replace Qll, C13, or Q6 when the HEAD ON signal is stable at low level.
  • Page 225 The LF PHA LF PHB signals of Ql 1 are the same as shown in Figure 14? Reverse LFPHA LF PHB LF OVD 3.2 ms Figure 14 Yes The waveform of LF OVD is the same as shown in Figure 14 during constant- speed operation? Replace one of the input elements (Tr20,120) of VRl or VR2.
  • Page 226 The SELECT switch does not function. The SEL SW signal on pin I I of QI is set low when the SEL switch is pressed? Replace CNI or LXSP board. Yes The output signal on pin 12 of QS or the input signals on pins I and I9 of QI occasionally drop to low level? the output signal the input signal on pins...
  • Page 227 The MODE switch does not function. The MODE SW signal on pin 13 of Ql is set low when the MODE switch is pressed? Replace CN or LXSP board. occasionally drop to low level? High the output signal the input signal on pins Figure 1 and19ofQl The output signal on pin...
  • Page 228 The LF switch does not function. The LF SW signal on pin 15 of Ql is at low level when the LF switch is pressed? Replace CNI or LXSP board. and 19 of Ql occasionally drop to low level? the output signal Figure 19 the input signals on pins and 19ofQl...
  • Page 229 The FF switch does not function. The FF SW signal on pin 17 of Ql is at low level when the FF switch is pressed? Replace CNl or LXSP board. Yes The output signal on pin 12 of Q5or the input signals on pins 1 and 19 of Ql occasionally drop to low level? the output signal signals...
  • Page 230 The PARK switch does not function. The PARK SW signal on pin 2 of Ql is at low level when the PARK switch is pressed? Replace CNI or LXSP board. Yes The output signal on pin 12 of Q5 or the input signals on pins 1 and 19 of Ql occasionally drop to low level? the output signal on pin 12 of Q5...
  • Page 231 The TOF SW signal on pin 8 of Ql is at low level when the TOF switch is pressed? Replace CNI or LXSP board. Yes The output signal on pin 12 occasionally drop to low level? the output signal the input signals on pins Figure 25 1 and 19of Ql of Q5...
  • Page 232 The PRINT switch does not function. PRINT SW signal on pin 4 ofQ1 is at low level when the PRINT switch is pressed? Replace CN 1 or LXSP board. occasionally drop to low level? the output signal the input signals on pins Figure 27 and 19ofQl The output signal on pin 10 of 44 or the input signals on pins 1,2, and...
  • Page 233 The CHARACTER switch does not function. The CHA SW signal on pin 6 of Ql is at low level when the CHA switch is pressed? Replace CNl or LXSP board. Yes The output signal on pin 12 of QS or the input signals oh pins and 19 of Ql occasionally drop to low level? the output signal...
  • Page 234 The parallel interface data cannot be received. The IF DATA 1-8 of Qll (MSM6990) is the same as shown in Figure 31? High ievel IF DATA 1-8 Low level Figure 31 Replace either resistor of IF DATA l-8 signals or CN5. Yes Themsignal (pin 2) of Ql 1 is the same as shown in Figure 31.

  • Page 235: Component Parts List

    COMPONENT PARTS LIST...

  • Page 236: Lxmc-Printed Circuit Board

    CONTENTS Component Parts List 2 - l LXMC-Printed Circuit Board 3 - l 4 - l PAII-Printed Circuit Board ..4 - 9 5 - l RS-232C (LXHI)-Printed Circuit Board...
  • Page 237 Table of ROM identification for each G. NO. without ROM for maintenance (with 77-7027 ML321 ODG ML compatible 77-7028 ML321 ODA EI compatible 84-7004 ML321 ODG EI compatible without ROM for maintenance (with 28 pin IC socket) without ROM for maintenance (with 32 pin IC socket) code.

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Microline ml321

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