DEC DECpc LPV Official manual

Page 1
DECpc LPv/LPv
DEC00152
Pin 1
DEC00144-4
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Service Guide
ER-740WW-SV.A01
Removing the Power Supply
SIMM Removal
1 Press retaining clips out 2 Push SIMM down and pull out
DEC00153
1 Disconnect power cord 2 Remove screw securing power on/off cable from chassis 3 Remove two screws securing power supply to chassis 4 Remove four screws securing power supply to rear panel 5 Remove power supply from computer
Removing the CPU
1 Disconnect power cord 2 Unlock and remove outside cover 3 Remove CPU 4 Install CPU 5 Set appropriate jumpers
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FRU Removals
5
Page 2
DECpc LPv/LPv
Pin 1
DEC00144-3
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Service Guide
ER-740WW-SV.A01
Removing the 5¼-Inch FDD
1 Remove two retaining screws from each side of bottom bay 2 Remove FDD from bay
DEC00082-3
Removing Cache and Tag SRAMs
1 Use suitable device puller and gently
remove SRAM chips from sockets
2 Be especially careful not to bend or
break pins
Removing the Mounting Adapter from the FDD
1 Remove two retaining screws from bottom and remove adapter
FRU Removals
4
DEC00079
Removing Real-Time Clock (RTC)
1 Use device puller and gently remove RTC from socket
Pin 1
DEC00144-2
Page 3
DECpc LPv/LPv
DEC00081-3
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Service Guide
Removing the Mounting Adapter
ER-740WW-SV.A01
1 Remove one retaining screw 2 Remove mounting adapter from
chassis
NOTE: Mounting bracket is required when installing a 3 1/2 inch device in the lower 5 1/4 inch drive bay.
Removing Filler Panels
1 Place screwdriver through hole at side 2 Release plastic locking tabs 3 Remove both filler panels
Removing the 3½-Inch FDD
1 From top bay, remove two retaining screws from each side 2 Remove FDD from bay 3 From bottom bay, remove two retaining screws securing mounting adapter to chassis 4 Remove FDD from bay with filler panel
DEC00078-2
DEC00076-2
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DEC00080
FRU Removals
3
Page 4
DECpc LPv/LPv
DEC00092-3
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Service Guide
ER-740WW-SV.A01
Unlocking and Removing the Outside Cover
1 Unlock outside cover 2 Remove two retaining screws at each side 3 Slide cover toward rear until it clears bezel
Removing Expansion Boards
1 Remove screw 2 Gently pull board outward
Removing Internal Mounting Tray
1 Loosen four retaining screws 2 Lift out of chassis
FRU Removals
2
DEC00118-2
DEC00119-2
Removing IDE Hard Disk Drive from Mounting Tray
1 Removing four mounting screws 2 Pull drive from mounting tray
DEC00086
Page 5
DECpc LPv/LPv
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Service Guide
System Description 1 of 1
ER-740WW-SV.A01
DECpc LPv/LPv
Main Logic Board
CPU Intel i486 Clock Speed 25 MHz SX, 33 MHz SX,
ROM BIOS 128 KB Cache, internal 8 KB Cache, secondary Direct-mapped, write-back,
Expansion Slots 3 Standard ISA,
Memory
Up to 64 MB using 4 MB, 16 MB, 32-bit SIMMs
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33 MHz DX, 50 MHz DX2, 66 MHz DX2
0 KB standard, 128 KB or 256 KB optional
8-bit and 16-bit
Power Supply
Rated Voltage Range 100 V ac - 120 V ac
220 V ac - 240 V ac
Maximum Range 88 V ac - 132 V ac
176 V ac - 264 V ac
Rated Input Current* 3.4 A
1.8 A
Frequency Range 50 Hz - 60 Hz
DC Voltage Output +12 V dc, -12 V dc
+5 V dc, -5 V dc
* Includes outlet current
SIMM Configuration
Bank 0 Bank 1 Bank 2 Bank 3 Total
4 MB 4 MB 4 MB 4 MB 8 MB 4 MB 4 MB 4 MB 12 MB 4 MB 4 MB 4 MB 4 MB 16 MB 4 MB 16 MB 20 MB 4 MB 4 MB 16 MB 24 MB
4 MB 4 MB 16 MB 16 MB 40 MB 16 MB 16 MB 16 MB 16 MB 32 MB 16 MB 16 MB 16 MB 48 MB 16 MB 16 MB 16 MB 16 MB 64 MB
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System Description
1
Page 6
DECpc LPv/LPv
Jumpers 2 of 3
Main Logic Board Jumper Settings
Feature Description Setting
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Service Guide
ER-740WW-SV.A01
Onboard VGA (IRQ9) Disable IRQ9
Enable IRQ9
Onboard VGA Enable VGA
Disable VGA
Factory test Normal
MFG test
Video display type Mono monitor
Color monitor
CPU clock speed 50 MHz J18, open
40 MHz J18, jumpered
33 MHz J18, jumpered*
25 MHz J18, open
J25, open* J25, jumpered
J23, pins 1 and 2 jumpered* J23, pins 2 and 3 jumpered
J28, open* J28, jumpered
J29, open* J29, jumpered
J19, open J20, open
J19, open J20, open
J19, open* J20, jumpered*
J19, jumpered J20, jumpered
Jumpers
8
* Factory setting
Page 7
DECpc LPv/LPv
Jumpers 1 of 3
Main Logic Board Jumper Locations
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Service Guide
1
23
J28
J29
ER-740WW-SV.A01
J12 J11 J10
Jumpers are shown with factory settings.
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J9
J25
J6 J4 J3
J23
J7
J20 J19
J18
DEC00143-2
Jumpers
7
Page 8
DECpc LPv/LPv
DEC00143-4
Power
Connectors
Hard Disk
Cable Connector
Diskette Drive
Cable Connector
Mouse
Connector
Keyboard
Connector
Mounting
Holes (4)
Front Panel
Indicators
Expansion Board Riser Card Slot
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Service Guide
Removing the Main Logic Board
1 Disconnect all cables 2 Remove expansion board riser card 3 Remove mounting screws and lift main logic board from computer
ER-740WW-SV.A01
FRU Removals
6
Page 9
DECpc LPv/LPv
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Service Guide
Rear Panel Connectors 3 of 3
Serial Port Connector
ER-740WW-SV.A01
The serial port is a 9-pin, D-shell male connector Supported baud rates are 300, 1200, 2400, 4800, 9600, 19 200, and 38 400. An asterisk (*) after a signal name indicates an active low signal state. For ex­ample, RXD*.
15
69
DEC00157
DB9 Signal Function
1 DCD Data Carrier Detect 2 RXD* Receive Data 3 TXD Transmit Data 4 DTR* Data Terminal Ready 5 GND Signal Ground 6 DSR Data Set Ready 7 RTS* Request To Send 8 CTS Clear To Send 9 RING Ring Indicator
Rear Panel Connectors
12
Page 10
DECpc LPv/LPv
DEC00156
13
1
25 14
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Service Guide
Rear Panel Connectors 2 of 3
Parallel Port Connector
ER-740WW-SV.A01
The parallel port connector provides an interface for a parallel printer or other parallel device. An asterisk(*) after a signal name indicates an active low signal state. For example, STB-R*.
DB25 Pin Signal Function
1 STB-R* Strobe 2 PRTD0 Printer data bit 0 3 PRTD1 Printer data bit 1 4 PRTD2 Printer data bit 2 5 PRTD3 Printer data bit 3 6 PRTD4 Printer data bit 4 7 PRTD5 Printer data bit 5 8 PRTD6 Printer data bit 6 9 PRTD7 Printer data bit 7 10 ACK* Acknowledge 11 BUSY Busy 12 PE Paper end 13 SLCT Select 14 AUTOFDXT* Autofeed 15 ERR* Error 16 INIT* Initialize printer 17 SLCTIN* Select 18 to 25 GND Ground
Rear Panel Connectors
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Page 11
DECpc LPv/LPv
6
51
10
15 11
DEC00154
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Service Guide
Rear Panel Connectors 1 of 3
VGA Connector
ER-740WW-SV.A01
The VGA connector is an industry standard, 15-pin, D-type, male connector
Pin Function
1 Red video 2 Green video 3 Blue video 4 MS2 5 Digital ground 6 Red return (ground) 7 Green return (ground) 8 Blue return (ground) 9 No connection 10 Digital ground 11 MS0 12 MS1 13 Horizontal sync 14 Vertical sync
Rear Panel Connectors
10
Keyboard and Mouse Connectors
The keyboard and mouse connectors are each 6-pin, mini-DIN connectors
6 16
1
DEC00155
15 No connection
Pin Function
1 Data 2 Reserved 3 Ground 4 +5 Vdc (fused) 5 Clock 6 No connection
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DECpc LPv/LPv
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Service Guide
Jumpers 3 of 3
Main Logic Board Jumper Settings (continued)
Feature Description Setting
Cache size select 0 KB J3, open*
128 KB J3, pins 1 and 2 jumpered
256 KB J3, pins 2 and 3 jumpered
ER-740WW-SV.A01
J4, open* J6, open* J7, open*
J4, pins 1 and 2 jumpered J6, pins 1 and 2 jumpered J7, pins 1 and 2 jumpered
J4, pins 2 and 3 jumpered J6, pins 2 and 3 jumpered J7, pins 2 and 3 jumpered
Reset switch Enable
Disable
CPU type DX J11, pins 1 and 2 jumpered*
SX J11, pins 2 and 3 jumpered
RDY signal type VLRDY->CPURDY (VL bus ready
connects to CPU bus ready) VLRDY->LRDY (VL bus ready
synchronized through chipset**)
Recovery mode Recovery mode
Normal
* Factory setting ** Might be required by some expansion boards Refer to the documentation supplied with the expansion board
J9, pins 1 and 2 jumpered* J9, pins 1 and 2 open
J12, pins 1 and 2 jumpered*
J12, pins 2 and 3 jumpered J10, pins 1 and 2 jumpered*
J10, pins 2 and 3 jumpered
J27, jumpered J27, open*
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Jumpers
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Page 13
DECpc LPv/LPv
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Service Guide
Logistics and Support 1 of 1
Part Numbers
54-22703-01 Main logic board, 486SX/25 54-22703-02 Main logic board, 486SX/33 54-22703-03 Main logic board, 486DX/33 54-22703-04 Main logic board, 486D2/50 54-22703-06 Main logic board, 486D2/66 54-22703-08 Main logic board, 486SX/25* 54-22703-09 Main logic board, 486SX/33* 54-22703-10 Main logic board, 486DX/33* 54-22703-11 Main logic board, 486D2/50* 54-22703-13 Main logic board, 486D2/66* 30-41318-02 Power supply, 145W 54-22058-01 Bus card 17-00606-02 Power cord term, 110V 17-00209-15 Power cord term, 220V 17-03460-02 Flat cable, 34-pin (diskette drive) 17-03461-01 Flat cable, 40-pin (IDE drive)
-PC7XL-AA Keyboard, US
-PCXAL-AA Keyboard, US
-PCXAL-NA Keyboard, US
-PC7XS-AA Mouse, 2-button 21-39125-01 Real-time clock
-ME524-DE 4 MB SIMM, 70ns
-ME544-DE 16 MB SIMM, 70ns
-PC75M-BA 128 KB SRAM, cache memory, 0-128K upgrade
-PC74M-BA 128 KB SRAM, cache memory, 128-256K upgrade
-RX23L-AA 3.5-inch FDD, 1.44 MB
-RX33L-AA 5.25-inch FDD, 1.2 MB
-RE23R-E 3.5-inch HDD 170 MB (IDE)
-RE24L-EA 3.5-inch HDD 245 MB (IDE)*
-RE25L-EA 3.5-inch HDD 525 MB (IDE)*
-RE24M-E 3.5-inch HDD 340 MB (IDE)
-RE25LL 3.5-inch HDD 540 MB (IDE)
ER-740WW-SV.A01
* for LPv only
Related Documentation
DECpc LPv/LPv+ User's Guide DECpc LPv/LPv+ Installation Card
Copyright © Digital Equipment Corporation 1993. All rights reserved. The DIGITAL logo and DECpc are trademarks of
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Digital Equipment Corporation.
ER-740WW-UA.A01 ER-740WW-IA.A01
Intel is a trademark of Intel Corporation. SIMM is a trademark of Wang Laboratories. QAPlus is a trademark of DiagSoft. PS/2 is a trademark of International Business Machines Corporation.
Logistics and Support
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DECpc LPv/LPv
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Service Guide
Troubleshooting 8 of 8
QAPLUS Error Messages (continued)
Component Messages Solution
Floppy drive Floppy Drives Failed Check connections
ER-740WW-SV.A01
Replace drive
Battery/Clock Clock Stopped
Invalid Date RTC Interrupt Failed
CMOS CMOS Clock Test Failed Change time from Setup
Serial port COM port failed
Serial Chip Error Serial Compare Error Serial Timeout Error
Onboard video circuitry
Video Failed Error in Video Buffer
Run Setup Replace battery/clock
menu in QAPLUS Check COM device
Check connections Replace COM device
Replace main logic board
Troubleshooting
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Page 15
DECpc LPv/LPv
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Service Guide
Troubleshooting 7 of 8
QAPLUS Advanced Diagnostics To: * Receive System Information, select SysInfo menu from the main menu. * Locate bad chips and run mouse and keyboard tests, select Interact menu. * Edit CMOS select Setup menu. * Run tests on components, select Testing menu.
Default testing is No Pause on Errors/Single Pass/No Peripherals/No Error Logging/Test All Components. To change default, select settings under the Testing menu
QAPLUS Error Messages
Component Messages Solution
ER-740WW-SV.A01
before
running tests.
CPU Arithmetic Function Failed
General Functions failed Exception Interrupt in Protected Mode Refresh Failure Logic Functions Failed
Hard disk Butterfly Cylinder Access Test Failed
Cylinder 0 Errors Random Cylinder Access Failed Linear Cylinder Access Failed
Hard drive/controller Controller Diagnostic Test FAiled
Questionable Controller Card Hard drives failed
Floppy diskette Media Mismatch
Drive Not Ready Unformatted Media Write Protected Media
Reset CPU Replace CPU
Low-level format hard disk Replace disk
Run Setup Check connections Reset controller Replace controller Replace disk
Use known good diskette Check size and density of diskette Close drive door Remove write protection Format diskette
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Troubleshooting
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Page 16
DECpc LPv/LPv
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Service Guide
Troubleshooting 6 of 8
DMA Channel Assignment
Channel Controller Function
0 1 Refresh 1 1 Not used 2 1 Diskette controller 3 1 ECP (optional) 4 2 Cascade DMA
ER-740WW-SV.A01
5 2 Not used 6 2 Not used 7 2 Not used
Troubleshooting
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Page 17
DECpc LPv/LPv
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Service Guide
Troubleshooting 5 of 8
Computer Interrupt Levels
ER-740WW-SV.A01
Priority Interrupt
Controller
1 1 IRQ0 Timer tick 2 1 IRQ1 Keyboard controller
1 IRQ2 Cascade interrupt 3 2 IRQ8 Real-time clock (RTC) 4 2 IRQ9 Reserved 5 2 IRQ10 Reserved 6 2 IRQ11 Reserved 7 2 IRQ12 Mouse interrupt 8 2 IRQ13 Math co-processor 9 2 IRQ14 Hard disk drive 10 2 IRQ15 Reserved 11 1 IRQ3 COM2, COM4 12 1 IRQ4 COM1, COM3 13 1 IRQ5 Reserved
Interrupt Number
Interrupt Source
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14 1 IRQ6 Diskette drive 15 1 IRQ7 LPT1, LPT2, LPT3
Troubleshooting
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DECpc LPv/LPv
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Service Guide
Troubleshooting 4 of 8
ER-740WW-SV.A01
I/O Address Map
Range (hexadecimal)
46E8 VGA enable register 42E8
42E8 4AE8 82E8 86E8 8AE8 8EE8 92E8 96E8 9AE8 9EE8 A2E8 A6E8 AAE8 AEE8 B2E8 B6E8 BAE8 BEE8 E2E8 E2EA
(continued)
Function
VGA enhanced mode register
Troubleshooting 16
Page 19
DECpc LPv/LPv
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Service Guide
Troubleshooting 3 of 8
I/O Address Map
Range (hexadecimal)
000 - 00F DMA controller one 020 - 021 Interrupt controller one 022 Index register (85C461) 023 Data register (85C461) 040 - 043 Interval timer 060 - 06F Keyboard controller 070 - 07F Real-time clock (RTC), NMI
ER-740WW-SV.A01
Function
080 - 08F DMA page register 0A0 - 0A1 Interrupt controller two 0C0 - 0CF DMA controller two 0F0 Clear math co-processor busy 0F1 Reset math co-processor 0F8 - 0FF Math co-processor 1F0 - 1F7 IDE controller 278 - 27A LPT2 2E8 - 2EF COM4 2F8 - 2FF COM2 378 - 37A LPT1 3BC - 3BE LPT3 3E8 - 3EF COM3 3B0 - 3DF VGA registers 3F0 - 3F7 Diskette controller 3F6 - 3F7 IDE controller (alt status, device address)
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3F8 - 3FF COM1
Troubleshooting
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DECpc LPv/LPv
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Service Guide
Troubleshooting 2 of 8
Beep Codes
Beep Codes for Fatal Errors
ER-740WW-SV.A01
Beep
Code
Error Message Port
80h
1-1-3 CMOS Write/Read test or failure 02h 1-1-4 ROM Checksum test or failure 03h 1-2-1 Interval timer test or failure 04h 1-2-2 DMA initialization or failure 05h 1-2-3 DMA page register write/read test or failure 06h 1-3-1 RAM refresh verification or failure 08h 1-3-3 1st 64 KB RAM chip or data line failure 0Ah 1-3-4 1st 64 KB RAM odd/even logic failure 0Bh 1-4-1 1st 64 KB RAM address line failure 0Ch 1-4-2 1st 64 KB RAM parity test failure 0Dh 2-1-1 Bit 0 1st 64 KB RAM failure 10h 2-1-2 Bit 1 1st 64 KB RAM failure 11h 2-1-3 Bit 2 1st 64 KB RAM failure 12h 2-1-4 Bit 3 1st 64 KB RAM failure 13h 2-2-1 Bit 4 1st 64 KB RAM failure 14h
Beep
Code
Error Message Port
80h
3-1-1 Slave DMA register test or failure 20h 3-1-2 Master DMA register test or failure 21h 3-1-3 Master interrupt mask register test or failure 22h 3-1-4 Slave interrupt mask register test or failure 23h 3-2-4 Keyboard/mouse controller test or failure 27h 4-2-1 Timer tick interrupt test or failure 34h 4-2-2 Shutdown test or failure 35h 4-2-3 Gate A20 failure 36h 4-2-4 Unexpected interrupt in protected mode 37h 4-3-1 RAM test or failure (above 0FFFFh) 38h 4-3-3 Interval timer 2 test or failure 3Ah 4-3-4 Time-of-day clock test or failure 3Bh 4-4-1 Serial port test or failure 3Ch 4-4-2 Parallel port test or failure 3Dh
4-4-3 Math coprocessor test or failure 3Eh 2-2-2 Bit 5 1st 64 KB RAM failure 15h 2-2-3 Bit 6 1st 64 KB RAM failure 16h 2-2-4 Bit 7 1st 64 KB RAM failure 17h 2-3-1 Bit 8 1st 64 KB RAM failure 18h 2-3-2 Bit 9 1st 64 KB RAM failure 19h 2-3-3 Bit A 1st 64 KB RAM failure 1Ah 2-3-4 Bit B 1st 64 KB RAM failure 1Bh 2-4-1 Bit C 1st 64 KB RAM failure 1Ch 2-4-2 Bit D 1st 64 KB RAM failure 1Dh 2-4-3 Bit E 1st 64 KB RAM failure 1Eh 2-4-4 Bit F 1st 64 KB RAM failure 1Fh
Troubleshooting
14
Beep Codes for Non-Fatal Errors
Beep
Code
3-3-4 Screen memory test or failure 2Bh 3-4-1 Screen initialization or failure 2Ch 3-4-2 Screen retrace test or failure 2Dh
Error Message Port
80h
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DECpc LPv/LPv
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Service Guide
Troubleshooting 1 of 8
POST Error Messages
ER-740WW-SV.A01
POST Countdown Number
240 200 190
180 0010 Keyboard stuck key
170 0041 Mouse failure - Check connection
160 ___ 640 KB base memory
150 050
100 0018 Invalid configuration - Run setup
Message Number
0007 0001 0009
0017 0019
Message Solution
No timer tick Shutdown Failure Timer 2 failure
Controller Clock line Data line Keyboard failure
0 KB extended memory
Time-of-day clock stopped Time-of-day not set
Contact your Digital service representative
- Check connections
- Check controller
- Replace keyboard
- Contact service rep.
- Check for IRQ conflict
- Replace mouse ___
- Contact service rep
- Run setup
- Replace clock
090 0011 Diskette drive failure - Run setup
080 0015 Hard disk failure
060 0021 nnnn0h optional ROM
040 0020 Keyboard locked Unlock keyboard 020 ___ Enable NMI 010 ___ Enable cache 000 ___ Boot
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HDD controller failure
bad Checksum=xxxx
- Check connections
- Replace drive
- Run setup
- Check connections
- Replace drive
- Correct address conflict
- Replace ROM chip
Troubleshooting
13
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