Morrow Micro Decision MD-1 Service Manual Download

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Summary of Contents for Micro Decision MD-1

Page 1: ...an Leandro California 94577 All rights reserved THE SERVICE PROCEDURES DESCRIBED IN THIS DOCUMENT ARE TO BE PERFORMED ONLY BY AUTHOR IZED MORROW DESIGNS DEALERSHIPS ONLY QUALI FIED SERVICE PERSONNEL S...

Page 2: ...rranties express or implied are made with respect to the contents hereof including but not limited to the implied warranty of merchantability or fitness for a particular purpose Further Morrow Designs...

Page 3: ...power supply assembly provides all DC operating voltages to the motherboard and the internal disk drives The motherboard power supply and disk drives are typically replaced as complete units Thus repa...

Page 4: ...A Chassis 4 2 Revision Band C Chassis 4 1 4 1 4 1 MOTHERBOARD RE ISIONS 5 5 1 5 2 5 3 Revision 1 1 Details Motherboard Removal Revision 2 0 Features 5 3 1 Parallel Port 5 3 2 Serial Ports 5 3 3 40 Pi...

Page 5: ...ssis MD 11 Revision Band C Chassis Drive Removal MD 11 Revision Band C Chassis Drive Removal MD 11 Revision Band C Chassis Drive Removal Power Supply Removal 2 1 2 1 2 2 2 3 2 3 2 4 2 5 3 2 3 3 3 3 3...

Page 6: ...Bit Map RAM Location 5 6 Parallel Port Addresses 5 7 Parallel Port Signals Kohjinsha Rev 2 0 Board 5 7 Parallel Port Signals Korean Assembled Rev 2 0 Board 5 8 RS 232 Signal Descriptions 5 9 JPA Pinou...

Page 7: ...l need a Phillips screwdriver preferably size 12 and magnetic Keep any magnetized tools away from diskettes that contain valuable files To help insure against callbacks you should wear a grounding wri...

Page 8: ...ow has installed three versions of Micro Decision chassis For clarification we refer to them as Revi sion A original model Revision B and Revision C newest chassis style The simplest way to distinguis...

Page 9: ...in the upper right portion of the Revision C rear panel rather than at the base The Revision C chassis also has two screws provided for removal of the Micro Decision motherboard FAN KNOCKOUT MOTHERBOA...

Page 10: ...Section 2 Cover Removal 09 23 83 00 o o o o 0 o o o o o o 0 Figure 2 4 Cover Removal Revision A Chassis o MOTHERBOARD SCREW LOCATIONS o 11111111111III III o J Figure 2 5 Location of Screws Revision A...

Page 11: ...closest to the edge two on either side NOTE A magnetized screwdriver is not required when working on Revision Band C chassis 2 Tip the unit and rest it on the rear panel 3 Slide the cover up and off r...

Page 12: ...Part I Section 2 Cover Removal 09 23 83 r ffi 9 MOTHERBOARD SCREW LOCATIONS EB L Figure 2 7 Location of Screws Revision C Chassis...

Page 13: ...drives and the type of chassis in which these drives are installed NOTE When removing MD II or MD III drives from a Revision 1 1 motherboard it is very important that you mark disk drives as A or B s...

Page 14: ...olds the two drives together Remember to mark one or both of the drives drive B must be reinstalled on top of drive A 3 3 MD I and MD III Revision Band C Chassis 1 Disconnect the flat ribbon cable s f...

Page 15: ...II Drive Removal Revision Band C Chassis 3 Remove the screw at the base of the ilL bracket on right side as viewed from the front of the unit Figure 3 2B the see Figure 3 2B MD I MD III Drive R emc va...

Page 16: ...e the two bottom screws from the straps on the right side of the drives Figure 3 3 Separating MD III Drives Revision Band C Chassis 3 4 MD II Revision Band C Chassis 1 Remove the cable connectors from...

Page 17: ...is Drive Removal a If removing the A drive remove the two screws on the support bracket see Figure 3 48 C l I I i Figure 3 48 MD II Revision Band C Chassis Drive Removal tJ I t r f In J v i n t I IJ J...

Page 18: ...ve Configuration and Removal 0 9 23 83 3 Toggle the L bracket connected to the drive as shown in Figure 3 4C Figure 3 4C MD II Revision Band C Chassis Drive RemlOval 4 Carefully pull the drive toward...

Page 19: ...crews on either side of the power supply s ventilation grill see Figure 4 1 The power supply will drop lightly onto the bench 4 When installing the new power supply route its wires as far away from dr...

Page 20: ...Part I Section 4 Power Supply Removal 09 23 83 Figure 4 1 Power Supply Removal 4 2...

Page 21: ...n Japan see Figure 5 2 and the other is assembled in Korea see Figure 5 3 These boards are generally mounted in Revision B and Revision C chassis 5 1 Revision 1 1 Details Figure 5 1 illustrates the la...

Page 22: ...OFD OFE OFF FUNCTION MOTOR CHECK PORT ROM ENABLE DISABLE out enable in disable VFO COUNT SET PORT MOTOR SHIFT CONTROL UPD 765 STATUS UPD 765 DATA 1st SERIAL PORT DATA 1st SERIAL PORT STATUS 2nd SERIA...

Page 23: ...n its side If disassembling a Revision A or Revision B chassis remove the four screws on the bottom that hold the motherboard to the chassis see Figure 2 5 or 2 6 If working with a Revision C chassis...

Page 24: ...iagnostics is labeled JP4 and is at location A 5 6 The 40 pin I O connector is at location F l thru K l Refer to Figure 5 2 for a diagram of this board The second board can be identified by the ASSEMB...

Page 25: ...J c J a z 0 0 0 c J c J U 0 0 UJ c J c J c 0 0 a c J 0 0 E 0 oZ8oA o oS253 I 765 I fROM I o W 8251 1 I I r_ Aa c J 8251 t i t r IJAftlI c J c J c J c J Figure 5 2 Rev 2 0 Motherboard Kohjinsha Table 5...

Page 26: ...Jg c J DO 0 0 CJ c J c J CJ c J CJ 0c J 825 1 i gJ4 c J c JO c J c J c J c J 0 765 0 I c J c J r 3 Dr 3 c J c J c J c J Dc J PROMIOc J Dc J w CJ Dc Dc J c J 0 2804 0 c J CJ PJ1 I I RAM LOCATION Figure...

Page 27: ...or the ports are listed in Table 5 6 Table 5 6 Parallel Port Addresses F4 Data port F5 Status port Read bit 3 l ACK bit 4 l Busy Write bit 7 Strobe The signals for the 34 pin edge connector are listed...

Page 28: ...system diskette first When you do this don t be surprised when garbage appears on the screen each time you press the reset button This is a garbled version of the message that normally tells you to in...

Page 29: ...s a set of jumper headers labelled JPA and JPB JPA has eight pairs of jumpers for defining the terminal port JPB has 13 pairs that define the printer modem port Slip on connectors are used to make the...

Page 30: ...ration is accomplished through circuit board wiring and the factory jumper settings as shown in Figure 5 5 When setting up JPA for use with a modem on the terminal port the jumper modifications depend...

Page 31: ...tings for Modems For cables that connect pin 2 to pin 2 and pin 3 to pin 3 set the jumpers as shown in Figure 5 7 following 1 1A RO 2 2A RD 3 3A OSR 4 4A OSR 5 5A DTR 6 6A DTR 7 7A 12V 8 8A 12V 0 0 0...

Page 32: ...minal 20 6 6A DTR from UART 5 7 7A TTL false 3V 8 8 8A TTL false 8 9 9A TTL false 8 10 lOA Receiver Clock to modern 17 11 llA RS 232 Receiver input N C 12 12A TTL output of RS 232 rcvr N C 13 13A N C...

Page 33: ...13B o o o CJ o o o o o 09 23 83 1 lA RO 2 2A RD 3 3A OSR 4 4A OSR 5 5A OTR 6 6A OTR 7 7A 3V 8 8A 3V 9 9A 3V 10 IDA 11 11A 12 12A 13 13A Figure 5 8 Factory Jumper Settings for JPB JPB Settings for Mode...

Page 34: ...6 6A DTR 7 7A 3V 8 8A 3V 9 9A 3V 10 IDA 11 llA 12 12A 13 13A Figure 5 9 JPB Jumper Settings Crisscross Modem Cable When using a modem cable that connects pin 2 to pin 2 and 3 to 3 use of the jumper s...

Page 35: ...ABLO 3 TI 810 QUME QUME NEC Xon Xoff COMREX DAISY WRITER 09 23 83 Sample 1 Sample 12 MORROW PRINTER MORROW PRINTER 1 1 1 l1li 1 2 Ill 2 2 l1li 2 3 3 3 3 7 4 7 6 6 7 7 20 20 20 11 Sample 3 Sample 14 MO...

Page 36: ...R 3 Buffered 10 Write RESET 5 Z80 Reset Line Output 4M 7 4 MHz zao Clock 1000 9 Decoded 10 Space at Location OO OFh 1010 11 Decoded 10 Space at Location 10 lFh 1020 13 Decoded 10 Space at Location 20...

Page 37: ...ny key and wait for the Diagnostics Menu to reappear 1 Port 1 test This test transmits a barber pole character pattern to the CRT 2 Port 2 test This test transmits a barber pole character pattern to t...

Page 38: ...n drive A close the door and select the VFO Test from the menu Open the disk drive door and read the frequency The frequency should read 480Khz 30Khz on the Kohjinsha board or 500 Khz 30Khz on the Kor...

Page 39: ...is the last drive on the chain then the terminator block is not removed Drive All is to be left unchanged The CP M distribution diskette must be booted to make a new CP M working diskette wi th the c...

Page 40: ...NDEX 10 OSO 10 OSO 16 MOTOR 12 DSI 18 OIRECTION 14 OS2 20 STEP 16 MOTOR 22 WRITE OATA 18 DIRECTION 24 WRITE GATE 20 STEP 26 TRACK 0 22 WRITE DATA 28 WRITE PROTECT 24 WRITE GATE 30 REAO DATA 26 TRACK 0...

Page 41: ...is a floppy diskette head cleaning kit 6 2 Troubleshooting Flowchart Use the troubleshooting flowchart see Table 6 1 for isolating a defective assembly within the Micro Decision as well as for determ...

Page 42: ...CE SWITCH VERI FY SWI TCH SETTI NGS FOR TE RMI NAL AND COMPUTER NO TURN OFF TERMINAL NO NO PLUG IN CORD YES NO TURN UP BRIGHTNESS YES NO _____ REPLACE TERMINAL j YES RUN TERMINAL SELF TEST YES YES POW...

Page 43: ...SS R ETU R N YES I NSE RT DIAGNOSTI C DISK AND RUN MEMORY TEST YES NO NO NO REPLACE MOT HE RBOA RD CHECK DRIVE VOLTAGES AND 1 DATA CABLES YES REPLACE MOTHERBOARD NO REPLACE POWER SUPPLY AND OR DATA CA...

Page 44: ...PRINTER PORT TEST Troubleshooting Procedures Table 6 1 Continued Troubleshooting Flowchart 09 23 83 YES RETURN WORK ING UN IT TO CUSTOMER NO l NO YES NO YES 1 REPLACE MOTHE RBOA RD 6 4 REPLACE CABLE R...

Page 45: ...the 40 pin I O connector on the board 5v 12v 12v Pins 38 and 40 Pin 36 Pin 34 Voltage 5v and 12v to the Rev 1 1 boards can be checked from the disk drives 12 volts can be checked from the 1488 serial...

Page 46: ...ther problem has been fixed you should still replace the power supply anyway Finally as with all intermittent problems if you suspect an intermittent power supply substitution is your best troubleshoo...

Page 47: ...25 MHLED B LED HARNESS 028 LED3105 1 LED 3 PC 080 MFP B FRONT PANEL 500 PCBM Rev 1 1 ASSM PCB REPRO ROM or Rev 2 0 060 34122C A CABLE 34S 12 102 SPM B STAND OFF 125 MHDC C DC POWER CABLES 500 SWPSM PO...

Page 48: ...lete set I Front Panel I Front Panel of manuals 6 Stand offs 6 Stand offs for each bd Notes Service Guide for Micro Decision Set of Manuals for Micro Decision Set of Manuals for Decision 1 Above price...

Page 49: ...D GI ION r folZ P N 2 z A AI E J r o I OR c 1 ZN Z AIt T I I t I L f H fill l H HI H i I r 1 i 1 H 1 1f 4 H t H AI 1 f 41H 1 1f H t H J AI ZA 41f H Hf l t H H A 2 4 t 6 l H 4 H 1 2 AIO 10 II r L I 7 r...

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Page 52: ...1 rz J Pe rz 2 TO D G If U Q I f3 1 L II IZ S T E 1 1 AP t 1 Ap 4...

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