1. Manuals
  2. Brands
  3. MiTAC Manuals
  4. Laptop
  5. 3025
  6. Service manual

MiTAC 3025 Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
3025
Notebook
Service Manual
No. 75 Minsheng East Road, Sect. 3
Taipei, Taiwan
Republic of China
Telephone :
(02) 501-8231
Telex
:
11942 TAIAUTO
Fax
:
886-2-501-4265
Part Number
:
5615 6619 0014 R00

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 3025 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for MiTAC 3025

Summary of Contents for MiTAC 3025

  • Page 1 3025 Notebook Service Manual No. 75 Minsheng East Road, Sect. 3 Taipei, Taiwan Republic of China Telephone : (02) 501-8231 Telex 11942 TAIAUTO 886-2-501-4265 Part Number 5615 6619 0014 R00...

  • Page 2: Table Of Contents

    Table of Contents General System Description 1.1 Introduction .......................1-1 1.2 System Description ....................1-3 1.2.1 System Board ....................1-4 1.2.2 Video Board ....................1-5 1.2.3 LCD Display....................1-6 1.2.4 Notebook Keyboard..................1-7 1.2.5 Floppy Disk Drive ..................1-7 1.2.6 Hard Disk Drive ....................1-7 1.2.7 Power Source ....................1-7 1.2.8 Power Conditions ..................1-8 System View and Disassembly 2.1 System View ......................2-1...
  • Page 3 Connector Input/Output Definition 4.1 Rear Panel Connectors ....................4-1 4.1.1 Parallel Port ....................4-1 4.1.2 Serial Port .....................4-2 4.1.3 External Keyboard ..................4-2 4.1.4 External VGA Monitor...................4-2 4.1.5 Expansion Chassis ..................4-3 4.2 Internal Connectors ....................4-4 4.2.1 VGA Adapter ....................4-4 4.2.2 DC-DC Inverter....................4-6 4.2.3 Fixed Disk .....................4-7 4.2.4 Diskette Drive ....................4-8 4.2.5 Turbo Converter (CONN8) ................4-9 4.2.6 DC-AC Converter ..................4-9...
  • Page 4 A Spare Parts A.1 System Board......................A-1 A.2 VGA Adapter ......................A-3 A.3 Final Assembly......................A-4 B RS-232 Connection B.1 Connecting to a 9-pin External Device ..............B-1 B.2 Connecting to a 25-pin External Device ..............B-2 C Signal Conventions C.1 3.5-Inch Diskette Drives ..................C-1 C.2 Fixed Disk Drives.....................C-2 C.3 LCD Display Panel and CCFT.................C-5 D Component Layout...
  • Page 5 Preface The 3025 Notebook Computer brings you all the functions and capacity of a high-performance, highly reliable desktop in a compact, light-weight A4-sized chassis. This notebook has been designed for long use and for a wide-range of professional and business applications. It is fully compatible with IBM PC/AT systems and has external connectors for adding expansion features.
  • Page 6 Appendix ASpare Parts lists the part numbers of the spare parts used for the major components of the notebook. Appendix BRS-232 Connection shows the pin assignment connection between an external device and the RS-232 port of your notebook. Appendix CSignal Conventions lists the manufacturer’s signal names and specifications for your notebook’s major devices.
  • Page 7 You will also find a “MiTAC Global Support Problem Worksheet” at the back of this manual. Please fill in this form when you encounter technical problems with any of our products and send the form to us or to our service dealer.

  • Page 8: General System Description

    General System Description 1 General System Description Figure 1-1. The 3025 Notebook Computer 1.1 Introduction The 3025 — light, compactly designed in an A4-sized clam shell chassis — is a powerful battery-powered notebook computer fully compatible with the IBM PC/AT.

  • Page 9: Lcd Display Screen

    General System Description Salient features of this system include the following: For Model 3025D:16-MHz 80386SX microprocessor For Model 3025E:20-MHz 80386SX microprocessor Socket for 80387SX coprocessor Coprocessor speed should be the same as the CPU speed LCD display screen High-contrast, B/W, VGA-compatible with CCFT (Cold Cathode Fluorescent Tube) backlighting Hard Disk Drive 2.5-inch internal hard disk drive (20, 40, 60, 80MB options), 25ms access...

  • Page 10: System Description

    General System Description 1.2 System Description Major components of the 3025 include the system board, video board, CPU, system memory, system BIOS, floppy and hard disk drive, LCD display, VGA controller, keyboard, power system, power supply, AC adapter, and the battery pack.

  • Page 11: System Board

    General System Description 1.2.1 System Board The system board was designed for easy access of all major components which include the following: CPU (U18) Intel 80386SX-16 microprocessor, 16MHz (for 3025D) — — Intel 80386SX-20 microprocessor, 20MHz (for 3025E) Numeric Coprocessor (U19) —...

  • Page 12: Video Board

    General System Description 1.2.2 Video Board The video board is stacked on top of the system board. Built into it is the Video Graphic Array (VGA) controller. It can support 640 x 480 pixels on the LCD display and external monitors. Its RAM has 256KB of memory (4464*4 soldered on the video board).

  • Page 13: Lcd Display

    General System Description The following display modes are supported by the VGA adapter: For a flat panel display 40 x 25 text in 16 shades of grey — — 80 x 25 text in 16 shades of grey 640 x 480 graphics in 16 shades of grey —...

  • Page 14: Notebook Keyboard

    General System Description 1.2.4 Notebook Keyboard — 82/83 keys, embedded keyboard, country-dependent layout, numeric/cursor keypad, 12 function keys and a special Fn (Function) key 1.2.5 Floppy Disk Drive — 3-1/2-inch floppy disk drive, 135TPI, double sided; Total formatted capacity 1.44MB Drive Height:19.5 mm LED IndicatorRed front-panel access LED Sectors Per Track:256/512/1024...

  • Page 15: Power Conditions

    General System Description DC-DC Converter — converts the DC to AC for the CCFT backlit in the LCD panel. The power system has a turbo converter supporting devices that cannot operate in low voltages such as the hard disk and the RS-232 port. DC-AC Inverter —...

  • Page 16: System View And Disassembly

    System View and Disassembly 2 System View and Disassembly 2.1 System View 2.1.1 Left/Front Panel DC Power Socket Power ON/OFF Button Hard Disk Drive (HDD) In-Use Indicator Power-On/Low Battery Indicator Floppy Disk Drive (FDD) Indicator 3 1/2-inch Floppy Disk Drive FDD Button Display Cover Latches 2.1.2...

  • Page 17: System Disassembly

    System View and Disassembly 2.2 System Disassembly 2.2.1 Preparation Tools Required The following tools are needed for the assembly/disassembly work on the notebook computer: — Phillips screwdriver (small) Phillips screwdriver (medium-sized) — — Slotted screwdriver (medium-sized) — Hex driver (5 mm) —...
  • Page 18 System View and Disassembly Assembly Overview The figure below shows the exploded view of the computer when disassembled. Each part is represented by a number. The next sub-sections will discuss at length each major part for disassembly and show corresponding illustrations. Figure 2-1.

  • Page 19: Lcd Section

    System View and Disassembly 2.2.2 LCD Section The top cover and the LCD section come off as a single unit, comprising the upper case of the computer. Eight screws attach the upper case to the lower case. Figure 2-2. LCD Section Removal —...

  • Page 20: Keyboard Section

    System View and Disassembly — Separate the upper case from the lower case. Start from the left side of the rear of the unit (near the power switch). Pull the upper case up to separate it from the lower case. You need to push the —...
  • Page 21 System View and Disassembly — Loosen the space bar (70) by carefully raising it straight up. It will break away from its mounting post and expose two of the screws underneath. Remove the five mounting screws (23). — — Pull the keyboard (24) straight up, away from the lower case until it is free of the keyboard connector (71).

  • Page 22: Vga Board

    System View and Disassembly 2.2.4 VGA Board The VGA board, secured by 4 screws is connected to the system board via two connectors on the left and right. The main components on the VGA board are facing down — towards the system board. Figure 2-4.

  • Page 23: System Board

    System View and Disassembly 2.2.5 System Board The system board is secured to the lower case with five stand-off fixtures. Figure 2-5. System Board Removal — Remove the tall standoff (28) Remove the two short standoffs (36) — — Remove the two medium standoffs (34) Remove the four screws (33).

  • Page 24: Hard Disk Drive (Hdd)

    System View and Disassembly 2.2.6 Hard Disk Drive (HDD) NOTE: The system board must be removed before the HDD can be removed. The HDD is mounted on a bracket which sits on the lower case. Figure 2-6. Hard Disk Removal —...

  • Page 25: Floppy Disk Drive (Fdd)

    System View and Disassembly 2-10 2.2.7 Floppy Disk Drive (FDD) The FDD has two mounting brackets securing it to the lower case. — Turn the lower case upside down. Remove the rubber foot (56) to expose the FDD mounting screw. —...

  • Page 26: Dc-Ac Inverter

    System View and Disassembly 2-11 2.2.8 DC-AC Inverter WARNING: NEVER attempt this procedure with the power on. High-voltage is present in the terminals. The DC-AC inverter supplies power to the LCD panel. It is mounted on the rear bracket of the system board (on the right). —...

  • Page 27: Turbo Converter

    System View and Disassembly 2-12 2.2.9 Turbo Converter The Turbo converter supplies extra power to the HDD and RS-232C port. It is mounted on left side of the rear bracket of the system board. Figure 2-9. Turbo Converter Disassembly — Detach the power cord connector (73) from the turbo converter.

  • Page 28: Dc-Dc Converter

    System View and Disassembly 2-13 2.2.10 DC-DC Converter The DC-DC Converter is soldered directly to the system board. Figure 2-10. DC-DC Converter Disassembly — There are two rows of pins (35) on the DC-DC converter (30). These must be desoldered in order to remove the DC-DC connector. —...

  • Page 29: Lcd Panel

    System View and Disassembly 2-14 2.2.11 LCD Panel The LCD panel is mounted on the back shell of the upper case. Figure 2-11 LCD Panel Disassembly — With your fingers, pry the plastic cover (11) away from the back shell of the LCD section.

  • Page 30: Cover Hinge

    System View and Disassembly 2-15 2.2.12 Cover Hinge The cover hinges are inside the upper case. Figure 2-12. Cover Hinge Disassembly — Close the LCD section. Lay the assembly down as shown. Two guide holes will be visible. Remove the hinge locking screws (20). They are inside the guide holes. —...

  • Page 31: Re-Assembly Notes

    System View and Disassembly 2-16 2.3 Re-assembly Notes CAUTION: Polarity of the AC power connector to the LCD panel is not critical. However, CONNECTION TO THE SYSTEM BOARD IS CRITICAL. Ensure that the V+ of the DC-AC Converter is connected to the VCC on the system board. To re-assembe the computer, note the following reminders: The LED fixing bracket must be inserted before the system board is fastened to the lower case...

  • Page 32: Internal System Upgrades

    Internal System Upgrades 3 Internal System Upgrades In the 3025 Guide to Operations, general procedures to upgrade the computer functions by connecting external devices to the notebook rear connectors have been discussed under Chapter 4 of said manual. Thus, external system upgrades will no longer be discussed in this service manual.

  • Page 33: Hdd Upgrade

    Internal System Upgrades Reboot the computer. Run SETUP to configure the computer for the new memory size. 3.2 HDD Upgrade 1. Disassemble the computer according to the procedures described in sub-sections 2.2.2 to 2.2.6. of Chapter 2. 2. Remove the old HDD from its mounting bracket. (Section 2.2.6). 3.

  • Page 34: Connector Input/Output Definition

    Connector Input/Output Definition 4 Connector Input/Output Definition This chapter describes all internal and external connectors on the computer. NOTE: Signal names listed in this chapter correspond to the signal names on the 3025D schematics. 4.1 Rear Panel Connectors 4.1.1 Parallel Port Designation: CONN12, Connector Type: DB-25 Parallel Port Strobe...

  • Page 35: Serial Port

    Connector Input/Output Definition 4.1.2 Serial Port Designation: CONN7, Connector Type: DB-9 Signal/Description /DCD1 /RXD1 /TXD1 /DTR1 /DSR1 /RTS1 /CTS1 9/RI1 4.1.3 External Keyboard Designation: CONN19, Connector Type: Mini DIN-6 Signal/Description KBDData Reserved +5V/ Fuse KBDCLK 6Reserved 4.1.4 External VGA Monitor Designation: CONN11, Connector Type: DB-15 Signal/Description Green...

  • Page 36: Expansion Chassis

    Connector Input/Output Definition BHSYNC BVSYNC 15Reserved 4.1.5 Expansion Chassis Designation: CONN9, Connector Type: 100-pin Signal Signal /IOCHK RESERDRV RESERVED IRQ9 RESERVED DRQ2 RESERVED RESERVED IOCRDY /SMEMW /SMEMR SA19 /IOW SA18 /IOR SA17 /DACK3 SA16 DRQ3 SA15 /DACK1 SA14 DRQ1 SA13 /REFRESH SA12 SYSCLK...

  • Page 37: Internal Connectors

    Connector Input/Output Definition IRQ14 LA18 /DACK0 LA17 DRQ0 /MEMR /DACK5 /MEMW DRQ5 /DACK6 DRQ6 SD10 /DACK7 SD11 DRQ7 SD12 RESERVED SD13 /MASTER SD14 RESERVED SD15 99GND100GND 4.2 Internal Connectors 4.2.1 VGA Adapter Designation: CONN15, Connector Type: 40-pin Signal/Description SA19 SA18 SA17 SD15 SA16...
  • Page 38 Connector Input/Output Definition Reserved Reserved 40GND Designation: CONN18, Connector Type: 40-pin Signal/Description Green Power Blue RHSYNC BVSYNC /SMEMW /SMEMR RAMDAC /SBHE BALE /REFRESH /IOR MEMCS16 /IOW DRQ1 DRQ3 IRQ9 /DACK1...

  • Page 39: Dc-Dc Inverter

    Connector Input/Output Definition RESETDRV /DACK3 Reserved 40GND 4.2.2 DC-DC Inverter (Input from AC SWPS) Connector Type: Mini DIN-9, CONN5 Signal/Description VA (DC +6.2V/3A MAX) VA (DC +6.2V/3A MAX) VB (DC CHARGER TO BATTERY) VA (+6.2V/3A MAX) VB (DC CHARGER TO BATTERY) VS (DC +12V/0.5A MAX) SHELLGND (DC Power to System Board)

  • Page 40: Fixed Disk

    Connector Input/Output Definition Designation: CONN6, Connector Type: 8-pin Signal/Description Power Good Battery Low VCC (+5V) 8GND 4.2.3 Fixed Disk Designation: CONN14, Connector Type: 44-pin, on system board Signal/Description /HOSTRESET HD10 HD11 HD12 HD13 HD14 HD15 Reserved /HOSTIOW /HOSTIOR Reserved HOSTALE Reserved...

  • Page 41: Diskette Drive

    Connector Input/Output Definition IRQ14 /IOCS16 HOSTA1 Reserved HOSTA0 HOSTA2 /HCS0 /HCS1 +5V/LED 44JP1 4.2.4 Diskette Drive Designation: CONN17, Connector Type: 26-pin, on system board Signal/Description /Index /DR0 PSKCHG/RG RPM/LC RESERVED /MTR0 RESERVED /STEP /WDATA /WGATE /TRK0 /WRTPRT /RDATA 26HDSEL...

  • Page 42: Turbo Converter (Conn8)

    Connector Input/Output Definition 4.2.5 Turbo Converter (CONN8) Signal/Description VCC, +5V INPUT 3VGG, +5V OUTPUT 4.2.6 DC-AC Converter Input Designation: CONN14, Connector Type: 3-pin, on system board Signal/Description ADJUST/DISABLE 3GND Output: 2-pin AC OUTPUT, 1000V, 10mA MAX. 4.2.7 Keyboard Module Designation: CONN16, Connector Type: 10-pin, on system board Signal/Description KBDCLK RESERVED...

  • Page 43: Sip Connector

    Connector Input/Output Definition 4-10 4.2.8 SIP Connector Designation: SIMM1, Connector Type: 40-pin, on system board Signal/Description /CASL3 RESERVED /MEW CASH2 /RAS2 /RAS3 /CASH3 CASL2 RESERVED RESERVED 400+5V...

  • Page 44: Lcd Connector

    Connector Input/Output Definition 4-11 4.2.9 LCD Connector Designation: CONN3 (on VGA adapter), Connector Type: 15-pin Signal/Description MOD (not used) XSCL START CP1/YSCL 15VCC...

  • Page 45: Troubleshooting

    Troubleshooting 5 Troubleshooting 5.1 Introduction When computer power is turned on, the system BIOS runs a series of internal checks on the hardware. These internal checks comprise the POST (Power-On Self-Test) which also allows the computer to detect problems as early as the power-on stage. The error messages and system beeps of POST can alert you to the problems of your computer.
  • Page 46 Troubleshooting Message Possible Cause Solution Diskette drive A failure The A: drive has either failed Check the A: drive or or is missing. connector. Diskette drive reset failed The diskette controller has Check the diskette connector. failed. If still failed, replace the system board.
  • Page 47 Troubleshooting Message Possible Cause Solution No timer tick interrupt The timer chip has failed. Turn the power off, then back on again. If the problem persists, replace the system board. Option ROM checksum The peripheral card contains Replace the peripheral card. failure a defective ROM.
  • Page 48 Troubleshooting Message Possible Cause Solution Keyboard stuck key failure A key(s) is jammed. Press the key(s) again. Memory failure at hex-value, Circuitry associated with the Turn the power off, then read hex-value, expecting memory chips has failed. back on again. If the hex-value problem persists, replace the system board.

  • Page 49: Run-Time Messages

    Troubleshooting 5.3 Run-Time Messages Run time messages are displayed if an error occurs after the boot procedure is complete. The table below lists these errors with corresponding solutions. Message Cause Solution I/O card parity interrupt at The peripheral card has Type (S)hut off NMI.

  • Page 50: Beep Codes

    Troubleshooting Software NMI A systems software routine Check all programs operating has generated an NMI to halt in the system. processing. Table 5-2. Run-time Messages 5.4 Beep Codes In some cases, POST errors cannot be reported on the screen. When an error occurs before the screen is initialized or when the system is set to loop on the system board tests, then the error message/s cannot be displayed on the screen.

  • Page 51: Using Beep Codes

    Troubleshooting The diagram below shows the process performed by the system if an error occurs and the screen is unavailable. 5.4.1 Using Beep Codes The table below shows the errors for which beep codes and screen messages are used: System Board Failure Error Type Fatal Non-Fatal...
  • Page 52 Troubleshooting 1-4-4 Software NMI port failure 2-1-1 Bit 0 first 64K RAM failure 2-1-2 Bit 1 first 64K RAM failure 2-1-3 Bit 2 first 64K RAM failure 2-1-4 Bit 3 first 64K RAM failure 2-2-1 Bit 4 first 64K RAM failure 2-2-2 Bit 5 first 64K RAM failure 2-2-3...
  • Page 53 Troubleshooting A failure in add-on boards or memory is reported on the monitor. These error messages help isolate the failed subsystem. Beep codes 4-2-1 through 4-4-3 and above are only reported through the speaker and sent to the diagnostic port if the manufacturing loop option switch MANLOOP is set to TRUE and the manufacturing jumper indicator is on in POST.

  • Page 54: Fault Isolation Charts

    Troubleshooting 5-10 5.4.2 Fault Isolation Charts Chart A No response when power is turned on Is the computer Connect the Is the Power LED lit connected to power battery or AC (Either battery or (Green)? adapter. AC adapter)? Can you hear the Is the battery RAM check and the Replace the...
  • Page 55 Troubleshooting 5-11 Chart B LCD lights up but no display shown Check pin 8 of the keyboard Replace U2 connector (with keyboard on the attached). Is voltage between keyboard 14 and 20V ? Check pin 13 of CONN2 on Return the the VGA board.
  • Page 56 Troubleshooting 5-12 Chart C HDD Failure Is the cable between CONN8 Reconnect the and the Turbo cable Converter securely connected? Is the HDD signal Reconnect the cable firmly cable connected? Measure the Trubo Replace the Turbo Converter VGG Converter output. Is it 5 Volts? Set the HDD type Run SETUP.
  • Page 57 Troubleshooting 5-13 Chart D Battery pack is not recharging Is the battery Replace the battery voltage close to with a new one zero? Is the battery pack Reconnect the securely battery pack connected? Check the voltage between pins 6 and Replace the AC 9 of the AC adapter.
  • Page 58 Troubleshooting 5-14 Chart E Diskette Drive Malfunction Is the diskette Retry with a usable? new diskette Run SETUP. Make the Is the floppy change in drive set for SETUP and 1.44 MB? reboot Are the cables Refasten the secure? cables Replace FDD.
  • Page 59 Troubleshooting 5-15 Expansion Keyboard External Keyboard Malfunction Turn the computer Was the keyboard off, plug the connected when keyboard, then turn power was off? the computer on again. Replace the PICO Is FUSE1 good? fuse with a new (properly rated) fuse Is the screw near Tighten the screw the external...

  • Page 60: Expansion Box

    Troubleshooting 5-16 Expansion Box Expansion Chassis Malfunction Ensure power is Does the green power connected. Or indicator on the repair the power chassis light up? supply in the chassis Is the 100-pin cable firmly connected to the Reconnect the computer and the cable at both ends expansion chassis? Open the cable head.
  • Page 61 Spare Parts A Spare Parts This appendix lists the part numbers of the spare parts used for the major components of the 3025. Part No. Description Qty Used Location 316661900001 PCB, PWA-3025D MBD 331031103001 CON; HDR, MA, 3PX1, 0.1, ST.GLD1JP1 331031104001 CON;...
  • Page 62 Spare Parts 331150020001 CONN, FPC/FFC, 20P, 1.25MM PITCH R/A, FEED, W/L1VGA LCD ADAPTER 331421115001 CONN, 15P WAFER-R 1.27MM, R/A, HI-DENSITY VGA LCD ADAPTER 421661900002 CABLE, 3P-3P 70MM WIRE ASSY; MC-CONN10 INVERT TO LCD CCFT1—INVERTER 421661900003 CABLE, 3P-3P 70MM MB-CONN8 WIRE ASSY; MBD TO INVERT1—TURBO-CONN1 4216619000034 CABLE, 13PX2-13PX2 150MM CABLE ASSY;...

  • Page 63: Connecting To A 9-Pin External Device

    RS-232 Connections B RS-232 Connection To connect an external device to the RS-232 9-pin port, follow the cable pin orientation below: B.1 Connecting to a 9-Pin External Device RS-232 9-pin port External Device 9-pin port Pin 3 Pin 2 Pin 4 Pin 6 Pin 8 Pin 9...
  • Page 64 RS-232 Connections RS-232 9-pin port External Device 25-pin port Pin 1 Pin 4 Pin 2 Pin 2 Pin 3 Pin 3 Pin 4 Pin 5 Pin 6 Pin 22 Pin 5 Pin 7 Pin 7 Pin 8 Pin 6 Pin 20 Pin 8 Pin 9...

  • Page 65: C Signal Conventions

    3.5-inch diskette drive Fixed disk drive LCD display panel and CCFT C.1 3.5-Inch Diskette Drives This section describes the signal interfaces to diskette drives used in the 3025. Citizen U0DA-07A Diskette Drive Signal Signal INDEX DRIVE SELECT 0 DISK CHANGE...

  • Page 66: Fixed Disk Drives

    Signal Conventions Performance 1 MB Mode2 MB Mode Unformatted Capacity (KB) per disk 1000 2000 per surface 1000 per track 6.25 12.5 Formatted Capacity (KB) 256 bytes/sector 655.2(16) 1311(32) 512 bytes/sector 737.2( 9) 1475(18) 1024 bytes/sector 819.2( 5) 1638(10) Transfer Rate (K-bits/second) Average Latency (msec) Access Time (msec) track-to-track (w/o settling)

  • Page 67: Pin Descriptions

    Signal Conventions -IOW -IOR -DACK (XT ONLY)28RESERVED +DRQ (XT ONLY) +IRQ -IO16 (AT ONLY) +ADDR 1 -PDIAG (AT ONLY) +ADDR 0 +ADDR 2 (AT ONLY) -CSO -CS1 (AT ONLY) -ACTIVE (LED) 5 VOLTS 5 VOLTS (MOTOR) (LOGIC) 43GND44XT/AT Pin Descriptions Signal Name Description -RESET...
  • Page 68 Signal Conventions the drive at the host. -DACK DMA handshake signal used to select a drive data register (XT-only) +DRQI29DMA handshake signal used to select a drive data register (XT-only)
  • Page 69 Signal Conventions Signal Name Description +IRQ Interrupt to the host system. In AT mode, this signal is enabled only when the drive is selected, and the host activates the -IEN bit in the Digital Output Register. When the -IEN bit is inactive, or the drive is not selected, this output is in a high-impedance state regardless of the state of the +IRQ bit.

  • Page 70: Lcd Display Panel And Ccft

    Signal Conventions -ACTIVEI39Signal from the drive used to drive an active LED whenever the disk is being accessed. Fixed Disk Drive Specifications Conner Prairie Tek CP2024120JD-JD E2825P-E2850P CMOS SETUP TYPE Formatted Capacity (MB) 21.4 21.4 21.4 42.5 Number of Disks Number of Heads Cylinders Bytes/Sector...
  • Page 71 Signal Conventions YSCL ROW scan shift clock Hi to Lo Scan start-up signal Data input clock signal Hi to Lo Display data signal (upper half) Hi (ON) Lo (OFF) Display data signal (lower half) Hi (ON) Lo (OFF) Enable input IC(9) Enable In 20EOEnable outputIC(8) Enable out CCFT...

  • Page 72: D Component Layout

    Component Layout D Component Layout D.1 System Board Components Lettermark Component on the Location on Name of Component Drawing the System Board Memory controller, address buffer, interrupt controller, data buffer (HT21) U22, 24-30 DRAM 1MB (44256) Parallel, serial, fixed disk, floppy disk controller (87310) Serial Port Driver (AD241) Speaker...
  • Page 73 Component Layout...

  • Page 74: Connector Layout

    Component Layout D.1.2 Connector Layout Lettermark Component on the Location on Name of Component Number of Drawing the System Pins Board CONN 1 Modem/ FAX SIO2 Interface CONN 4 Modem/ FAX SIO2 Interface CONN 3 Modem Phone Interface CONN 5 AC SWPS Input CONN 6 D/D Module Input...
  • Page 75 Component Layout...
  • Page 76 Copyright © 1991 MITAC International Corp.

This manual is also suitable for:

3025d3025e3025f

Table of Contents