Psion Workabout MX User manual

Workabout MX
Service Manual

Confidential - PSION INDUSTRIAL PLC
Workabout MX Service Manual
Version 1.0 iii
© Copyright Psion Industrial PLC 1998.
All rights reserved. This manual and the programs referred to herein are copyrighted works of
Psion Industrial PLC, 92 Milton Park, Abingdon, OX14 4RY, United Kingdom. Reproduction in
whole or in part, including utilisation in machines capable of reproduction or retrieval, without
the express written permission of Psion Industrial PLC is prohibited. Reverse engineering is
also prohibited.
The information in this document is subject to change without notice.
Psion and the Psion logo are registered trademarks, and Psion Workabout, MX, 3Link, SSD
and Solid State Disk are trademarks of Psion PLC.
Some names referred to are registered trademarks.
Psion Industrial reserves the right to change the designs and specifications of its products at
any time without prior notice.
Psion part no: A6124-0002-01
Version 1.0 - September 1998
English

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Workabout MX Service Manual
iv Version 1.0
Note
The Psion Workabout contains CMOS devices that may be damaged by electrostatic
discharge (ESD). The following steps to minimise ESD must be taken before the unit is
dismantled. To prevent any damage that could result if the unit or its parts are not handled
properly, observe the following precautions during any handling procedures:
n Minimise all handling of static-sensitive components and assemblies.
n Transport and store static-sensitive components and assemblies in their original
containers or in anti-static bags.
n Label accordingly any package that contains static-sensitive components or assemblies.
n Discharge static electricity from the body by wearing a grounded anti-static wrist strap
while handling these components. Servicing static-sensitive components or assemblies
should be done only at a static-free work station by qualified service technicians.
Increasing the humidity in the work area minimises static electricity problems.
n Do not allow anything that can generate or hold a static charge on the work station
surface.
n Pick up components by their bodies, never by their leads.
n Do not slide components over any surface.
n Avoid handling components in areas with a floor or work-surface covering that can
generate static charge.
FCC Information for the USA
Radio and Television Interference:
This equipment radiates radio frequency energy and if not used properly - that is, in strict accordance
with the instructions in this manual - may cause interference to Radio and Television reception.
It has been tested and found to comply with the limits for a Class B computing device pursuant to part
15 of the FCC Rules. These are designed to provide reasonable protection against harmful interference
in a residential installation. This equipment can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which can be determined
by turning the equipment off and on, the user is encouraged to try to correct the interference by one or
more of the following measures:
n Reorient or relocate the receiving antenna.
n Increase the separation distance between the equipment and the receiver.
n If you are using the Workabout computer with a mains adapter, plug it into an outlet which is on a
different circuit from that to which the receiver is connected.
Consult an authorised Psion dealer or an experienced radio/TV technician for help.
This equipment was tested for FCC compliance under conditions that included the use of shielded
cables and connectors between it and the peripherals. It is important that you use shielded cable and
connectors to reduce the possibility of causing Radio and Television interference. Shielded cables,
suitable for the Workabout, can be obtained from an authorised Psion dealer. If the user modifies the
Workabout or the Multiple Docking Station, and these modifications are not approved by Psion, the
FCC may withdraw the user's right to operate the equipment. For customers in the USA, the following
booklet prepared by the Federal Communications Commission may be of help: "How to Identify and
Resolve Radio-TV Interference Problems". This booklet is available from the US Government Printing
Office, Washington, DC 20402 - Stock No: 004-000-00345-4.
Y

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Workabout MX Service Manual
Version 1.0 v
Table of Contents
Introduction.....................................................................................................1
Part Number Information................................................................................2
Serial Number Information.............................................................................2
Troubleshooting Guide..................................................................................4
Exploded View - General Assembly..............................................................6
Exploded View - Chassis Assembly..............................................................8
Exploded View - Drawer Assembly...............................................................9
Spares Kits....................................................................................................10
General Kits ...............................................................................................................10
Bottom Port Kits.........................................................................................................10
Drawer Kits.................................................................................................................11
Case Kits....................................................................................................................11
LCD Kits.....................................................................................................................12
PCB Kits.....................................................................................................................12
Dismantling the Workabout.........................................................................13
Tools Required................................................................................................................13
Dismantling Procedure....................................................................................................13
Dismantling the Chassis Assembly..................................................................................14
Dismantling the Drawer Assembly...................................................................................16
Selecting the PCB Type ...............................................................................17
Re-assembly Instructions............................................................................18
Re-assembling the Drawer Assembly ..............................................................................18
Notes on Drawer Re-assembly ...................................................................................18
Re-assembling the Chassis Assembly .............................................................................19
Notes on Chassis Re-assembly ..................................................................................19
Final Re-assembly...........................................................................................................20
Notes on Final Re-assembly.......................................................................................20
Checking the Operation of the Options......................................................21
Checking the RS232 Interface.........................................................................................21
Testing the TTL Interface ................................................................................................22
Testing the Barcode Interface..........................................................................................22
Expansion Interface......................................................................................23
RS232 AT/TTL Serial Interfaces......................................................................................23
RS232 AT Serial/Barcode Interfaces...............................................................................24
Circuit Description........................................................................................25
LIF Converter..................................................................................................................25
Final Test.......................................................................................................26
Equipment.......................................................................................................................26
Test Setup.......................................................................................................................26
Test Sequence................................................................................................................27

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Workabout MX Service Manual
Version 1.0 1
Introduction
The purpose of this service manual is to give an overview of the service procedures that may
need to be performed on the Workabout by either a third party user, or a registered Psion
service centre. It has been designed to be used by the service and repair technicians who
have the responsibility of maintaining the products.
The Workabout uses both conventional and high-density surface mount component
technology, which requires specialist servicing techniques. We therefore recommend that
repairs are carried out at circuit board level, rather than at component level. We also
encourage service centres to carry a small buffer stock of replaceable parts, to allow
immediate exchange, should they need to be replaced.
Although a Final Test Unit is not essential to service a Workabout, it is recommended and is
described in the Final Test section on page 26. The Final Test Unit (Psion part no. 1828-
0100-01) is used within Psion during the manufacturing process to run a final check on the
assembly. When a Workabout is connected to the Test Unit via the LIF Connector, test code
(the test program) is downloaded into the machine, which then automatically performs an
exhaustive and modifiable series of tests on the Workabout.
This test program can be run to monitor the liquid crystal display (LCD), keyboard, drawer
switch, solid state disks (SSDs), serial channel, and piezo status. Operating, idle, and standby
current consumption can also be measured. This can be very valuable when investigating or
diagnosing a reported problem. Also, once a repair has been completed, a full test can be run
to ensure that the repair has been done correctly and that no other fault has been introduced.
+Note:- The information in this document is confidential and should therefore only be
released under a non-disclosure agreement.

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Workabout MX Service Manual
2Version 1.0
Part Number Information
The part numbers referred to throughout this manual typically do not show the revision suffix.
Consequently, refer to your Psion distributor for information on the latest revision of a specific
part.
The format of the part numbers issued by Psion Industrial is as follows:
NNNN-NNNN-NN
Part Category Revision Suffix
Number
Serial Number Information
Each Workabout has a unique serial number that includes codes for the year and week it was
manufactured. The serial number can therefore be used to determine whether a Workabout is
still within its warranty period.
The serial number is located on a label on the Drawer Assembly. It has the following format:
1 number - year of manufacture.
1 = 1993
2 = 1994
…
9 = 2001
2 numbers - week of manufacture.
01 = first week in January
52 = last week in December
4 numbers - unique identifier.
0001 = first product of its type to be
produced in a week
9999 = 9999th product of the same type
to be produced in the same week
M L V T Y W W X X X X
1 letter - variant (see table below).
1 letter - used for manufacturing purposes.
The letter M - generic code for the MX.
1 letter - product type.
A = alphanumeric keypad
B = numeric keypad
C = future variant

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Workabout MX Service Manual
Version 1.0 3
The table below lists the variant code for Workabout MX variants that are expected to be
shipping within a few months of product launch.
Further codes will be released along with new variants.
Code Option ports fitted
Top option ports Bottom option port
A- -
BTTL & RS232 -
CBCR & RS232 -
DTTL & IrDA RS232
EWand RS232
FScanner RS232
GIrDA IrDA
HTTL & RS232 IrDA
I-K reserved
LScanner IrDA

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Workabout MX Service Manual
4Version 1.0
Troubleshooting Guide
Fault Cause Cure
Machine fails to
boot up. 1Discharged/faulty batteries.
2Main PCB fault.
3Fuse faulty.
4Battery contact fault.
1Replace alkalines/replace or recharge
Nicad pack.
2Remove internals from machine and
check Main Power FFC ZIF Connector.
3Remove fuse. Check and replace if
necessary.
4Check for continuity of battery
contacts/Main FFC using multimeter.
Replace if necessary.
Lines on LCD. 1LCD damaged.
2LCD ZIF open.
3Main PCB problem.
1Replace LCD.
2Dismantle machine until Chassis
Assembly is exposed, close ZIF,
reassemble.
3Follow Dismantling the Workabout to
remove and replace Main PCB. Return
faulty PCB to Psion.
Blue portions on
LCD. 1LCD damaged. 2LCD ZIF open.
3Main PCB problem.
1Replace LCD.
2Dismantle machine until Chassis
Assembly is exposed, close ZIF,
reassemble.
3Follow Dismantling the Workabout to
remove and replace Main PCB. Return
faulty PCB to Psion.
Cracks on LCD. LCD glass broken. Replace LCD.
Workabout has
problems with LIF
communications.
Main PCB problem. Follow Dismantling the Workabout to
remove and replace Main PCB. Return
faulty PCB to Psion.
Workabout has
problems reading
SSDs.
1Warped Connector
Block Arm.
2Main FFC faulty.
3Door switch on Main
PCB damaged.
1Dismantle machine, remove and
replace Connector Block.
2Replace Drawer Assembly.
3Follow Dismantling the Workabout to
remove and replace Main PCB. Return
faulty PCB to Psion.
No top port
communications
possible.
1Damaged expansion
FFC.
2Warped Connector
Block Arm.
3Loose ZIF connector.
4Door switch on Main
PCB damaged.
1Replace Drawer Assembly.
2Dismantle machine, remove and
replace Connector Block.
3Remove outer case of machine,
relocate Expansion FFC and close ZIF.
4Follow Dismantling the Workabout to
remove and replace Main PCB. Return
faulty PCB to Psion.
No infrared
communications. 1Top port damaged. 2Bottom port damaged. 1Replace Drawer Assembly. 2Replace bottom infrared port flexi-
connector.
No TTL
communications
possible.
1Damaged expansion
FFC.
2Warped Connector
Block Arm.
3Loose ZIF connector.
4Door switch on Main
PCB damaged.
1Replace Drawer Assembly.
2Dismantle machine, remove and
replace Connector Block.
3Remove outer case of machine,
relocate Expansion FFC and close ZIF.
4Follow Dismantling the Workabout to
remove and replace Main PCB. Return
faulty PCB to Psion.

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Workabout MX Service Manual
Version 1.0 5
Fault Cause Cure
No Bar Code
communications
possible.
1Damaged expansion
FFC.
2Warped Connector
Block Arm.
3Loose ZIF connector.
4Door switch on Main
PCB damaged.
1Replace Drawer Assembly.
2Dismantle machine, remove and
replace Connector Block.
3Remove outer case of machine,
relocate Expansion FFC and close ZIF.
4Follow Dismantling the Workabout to
remove and replace Main PCB. Return
faulty PCB to Psion.
Outer case/
keymat/window
damaged.
User damage. Remove the outer case assembly and
replace. Make sure the labels on the new
case match the labels on the old case.
Drawer cannot be
closed. 1Drawer derailed. 2Mechanical
interference.
3Drawer lock damaged.
1Refit Drawer.
2Remove case from machine. Check for
obstructions and interference caused by
misplaced/ill-fitting batteries, battery
contacts, SSDs, FFCs, PCBs, seals,
etc.
3Replace outer case.
Drawer not
opening when
release button is
pressed.
1Drawer derailed.
2Release button
damaged.
3Mechanical
interference.
4Drawer Spring
missing.
1Refit Drawer.
2Replace outer case or Drawer
Assembly.
3Remove case from machine. Check for
obstructions and interference caused by
misplaced/ill-fitting batteries, battery
contacts, SSDs, FFCs, PCBs, seals,
etc.
4Replace Drawer Spring.
Drawer will not
stay closed. 1Mechanical interference.
2Drawer lock damaged.
1Remove case from machine. Check for
obstructions and interference caused by
misplaced/ill-fitting batteries, battery
contacts, SSDs, FFCs, PCBs, seals,
etc.
2Replace outer case or Drawer
Assembly.
Alphanumeric
keys not working. 1Damaged keymat. 2Defective Main PCB. 1Replace case. 2Replace Main PCB.
Nicad pack fails
to charge. 1Central contact not connecting.
2Battery contacts
damaged.
3Nicad pack damaged.
4Charger problems.
1Replace Drawer Assembly.
2Replace Drawer Assembly.
3Replace Nicad pack.
4Consult Docking Station Service Manual
Psion p/no: 6104-0004-01.
Machine switches
off when
operated.
Main Power FFC
damaged. Replace Drawer Assembly.
Backlight does
not work. 1Backlight damaged. 2Main PCB problem. 1Replace backlight. 2Replace Main PCB.
Backlight is dim. Backlight worn.
Approximate time to 50%
brightness is 500 hours.
Replace backlight.

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Workabout MX Service Manual
6Version 1.0
Exploded View - General Assembly
The following illustration shows the general assembly, dismantled into replaceable
subassemblies and components.
Note that the numbered circles in the illustration correspond to the items in the REF. column
of Table 1.
1
10
2
3
4
5
6
7
8
9
11
12
13
14

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Workabout MX Service Manual
Version 1.0 7
Table 1
REF. PART NO. DESCRIPTION QTY
1A6204000601 LBL BOTTOM 1
A6204006301 LBL BTM RS232/LIF 1
A6224000201 LBL BTM IRDA/LIF 1
2A83020003 SCREW M2.5x10MM POZ.CS 2
3 2821005001 MX ALPHA CASE + LATCH 1
TBS MX NUMERIC CASE + LATCH 1
2821004801 MX SCANNER CASE + LATCH 1
TBS MX SCANNER NUMERIC CASE + LATCH 1
4A6224000301 LBL MX 2MB MEMORY 1
5A8704001802 BOTTOM SEAL 1
6A1804100801 MLDG D-TYPE BLANK 1
A8124000601 MX BTM FLEXI IRDA 1
2821004001 MX BTM FLEXI RS232 1
7A8304003 SCREW M2x4MM PANHEAD BLACK 2
8A8304000101 NUTSERTS 2
9A83040003 SCREW M2x4MM PANHEAD BLACK 2
10 28210006001 EXPANSION PCB (Barcode/Wand) 1
A2802005002 DECODER PCB (Scanner) 1
A8104104801 DECODER PCB SUPPORT MOULDING (Scanner) 1
11 A8404000401 DRAWER SPRING 1
12 A8104100701 CONNECTOR BLOCK 1
13 A6224000401 LBL MX REAR CASE 1
A6224001301 LBL MX SCANNER REAR 1
14 A8704000701 LIF DUST COVER 1

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Workabout MX Service Manual
8Version 1.0
Exploded View - Chassis Assembly
The following illustration shows the chassis assembly, dismantled into replaceable
subassemblies and components.
Note that the numbered circles in the illustration correspond to the items in the REF. column
of Table 2.
1
2
3
4
5
6
7
8
10
9
Table 2
REF. PART NO. DESCRIPTION QTY
1A2802000301 LCD MODULE (240x100) 1
2A8704000401 FOAM LCD SUPPORT 1
3 2821004601 MX PCB 2MB 1
4A83040003 SCREW M2x4MM PANHEAD BLACK 1
5A8104100702 CONNECTOR BLOCK 1
6A8421000301 DRAWER SPRING 1
7A8104100605 CPU FRAME 1
8A2802000402 LCD BACKLIGHT 1
9A8704000901 LCD SLEEVE 1
10 A8704003801 CHASSIS SEAL 1

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Workabout MX Service Manual
Version 1.0 9
Exploded View - Drawer Assembly
The following illustration shows the Drawer Assembly, dismantled into subassemblies and
components.
+Note:- The Drawer Assembly is normally replaced as a complete kit (see Spares Kits on
page 10). It is therefore not necessary to dismantle the Drawer Assembly. This illustration is
included for information purposes only.
Note that the numbered circles in the illustration correspond to the items in the REF. column
of Table 3.
1
6
2
34
5
7
Table 3
REF. PART NO. DESCRIPTION QTY
1A83040028 SCREW M2x16MM TOP CAP 4
2A8724000201 FOAM PIEZO SEAL 1
3A83040003 SCREW M2x4MM PANHEAD BLACK 2
4A8104100301 SSD BACK 1
5A6204001101 BATTERY CONFIGURATION LABEL 1
6A8104100501 LITHIUM BATTERY DOOR 1
7A6204000401 TOP CAP LABEL - BLANK 2

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Workabout MX Service Manual
10 Version 1.0
Spares Kits
The following tables show the listed spares kits that are offered to service centres enabling
thorough and complete service and repair work. These tables are correct at the time of
printing this manual. Please refer to the latest Psion Industrial spares list for current
information.
General Kits
PART NUMBER DESCRIPTION QTY
1828000101 MX GENERIC KIT
LBL BATTERY CONFIGURATION 10
BATTERY TAG 100 X 9 MM 30
MLDG SSD/BATT DRAWER NO CATCH 10
MLDG SSD BACK 5
MLDG LITHIUM DOOR 5
MLDG CPU FRAME 5
S3C MLDG CONN SUPPORT 5
MLDG D-TYPE BLANK 5
NUTSERTS 20
SCREW M2x4MM PANHEAD BLACK 40
THIN HEAD B TYPE DIA 2x4 LNG 20
DRAWER SPRING 20
FOAM LCD SUPPORT 10
LIF DUST COVER 10
LCD SLEEVE 10
PIEZO SEAL 10
CHASSIS SEAL 10
TOP CAP SEAL 10
SCREW M2x16MM TOP CAP 10
BOTTOM SEAL 20
1828000201 MX LABEL KIT
LBL MX 2MB MEMORY 25
LBL MX REAR CASE 25
LBL KBD 57AN - EURO 25
LBL TOP CAP BLANK 10
LBL TOP CAP FCC ID 10
LBL BTM RS232/LIF 5
LBL BTM IRDA/LIF 5
1828000301 MX LATCH KIT
MX CATCH ASSY 10
Bottom Port Kits
PART NUMBER DESCRIPTION QTY
1828001001 MX BTM PORT IRDA
MX BTM FLEXI IRDA 10
LBL BTM IRDA/LIF 10
BTM SEAL 10
1828001101 MX BTM PORT RS232
MX BTM FLEXI RS232 10
LBL BTM RS232 10
BTM SEAL 10

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Workabout MX Service Manual
Version 1.0 11
Drawer Kits
PART NUMBER DESCRIPTION QTY
1828002001 MX DRAWER KIT - RS232/TTL
MX RS232/TTL DRAWER 10
BTM SEAL 10
1828002101 MX DRAWER KIT - RS232/BCR
MX RS232/BCR DRAWER 10
BTM SEAL 10
1828002201 MX DRAWER KIT - INT WAND
MX WAND DRAWER 10
BTM SEAL 10
1828002301 MX DRAWER KIT - SCANNER
MX SCANNER DRAWER 10
BTM SEAL 10
1828002401 MX DRAWER KIT - IRDA
MX IRDA DRAWER 10
BTM SEAL 10
1828002501 MX DRAWER KIT - IRDA/TTL
MX TTL/IRDA DRAWER 10
BTM SEAL 10
1828002601 MX DRAWER KIT - BASE
MX BASE DRAWER 10
BTM SEAL 10
Case Kits
PART NUMBER DESCRIPTION QTY
1828003001 MX CASE KIT ALPHA GREY
MX ALPHA CASE + LATCH 10
LBL MX 2MB MEMORY 10
LBL MX REAR CASE 10
SCREW M2.5x10MM POZ.CS 20
LBL BOTTOM 10
BOTTOM SEAL 10
LBL BTM RS232/LIF 5
LBL BTM IRDA/LIF 5
1828003101 MX CASE KIT NUMERIC GREY
MX NUMERIC CASE + LATCH 10
LBL MX 2MB MEMORY 10
LBL MX REAR CASE 10
SCREW M2.5x10MM POZ.CS 20
LBL BOTTOM 10
BOTTOM SEAL 10
LBL BTM RS232/LIF 5
LBL BTM IRDA/LIF 5
1828003201 MX CASE KIT SCANNER
MX SCANNER CASE + LATCH 10
LBL MX 2MB MEMORY 10
LBL MX REAR CASE 10
SCREW M2.5x10MM POZ.CS 20
LBL BOTTOM 10
BOTTOM SEAL 10
LBL BTM RS232/LIF 5
LBL BTM IRDA/LIF 5

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Workabout MX Service Manual
12 Version 1.0
PART NUMBER DESCRIPTION QTY
1828003301 MX CASE KIT SCANNER NUMERIC
MX SCANNER NUMERIC CASE + LATCH 10
LBL MX 2MB MEMORY 10
LBL MX REAR CASE 10
SCREW M2.5x10MM POZ.CS 20
LBL BOTTOM 10
BOTTOM SEAL 10
LBL BTM RS232/LIF 5
LBL BTM IRDA/LIF 5
LCD Kits
PART NUMBER DESCRIPTION QTY
1808001401 W/A SPARES KIT BACKLIGHT KIT
ASSY EL/BACKLIGHT 3V
1808001520 W/A SPARES KIT-LCD
LCD MODULE (240X100)
PCB Kits
PART NUMBER DESCRIPTION QTY
1828004001 MX PCB 2MB
MX PCB 2MB 1
1828004101 MX SCANNER EXPANSION KIT
DECODER PCB 1
SUPPORT MOULDING 1
SCREW M2x4MM 2
1828004201 MX BARCODE/WAND EXPANSION KIT
EXPANSION PCB 1
SCREW M2x4MM 2

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Workabout MX Service Manual
Version 1.0 13
Dismantling the Workabout
The modular design of the Workabout is such that the internal workings of the product can be
removed from the case by removing two screws. This means that if the outer case assembly
becomes damaged, it can be replaced quickly and easily without the need to change any
other component. If there is a fault in the Outer Case Moulding, LCD Window, Keyboard
Frame, or Rubber Keymat, the entire case should be replaced.
+Note:- In some cases the machine may be fitted with security screws that require a suitable
screwdriver to remove them.
When you remove internal components from the case, take care not to damage the LCD
Module. Do not bend the Module, as it is prone to fracturing. Do not touch the LCD Glass as it
will show finger marks and smudges.
If the LCD glass is broken, be careful not to get any liquid in your mouth or eyes. In the event
of any liquid crystal getting on skin or clothes, wash it off immediately with soap and plenty of
water and seek a doctor’s advice.
Tools Required
Tool Description Type
Crosshead Screwdriver Pozi Size - 0
Crosshead Screwdriver Phillips Size - 00
Screwdriver Flat Size - 2.5mm
Nut Spinner n/a 4mm AF
Knife/Scalpel n/a n/a
Pliers Snipenose n/a
Dismantling Procedure
1Press the drawer release button (or use a security key if necessary) and open the
Workabout.
2Remove any batteries (including the Lithium Dry Cell) and SSDs that are inside the
Workabout.
3Remove the fuse from its location beneath the main batteries. If the fuse is damaged,
replace it with a 1.25 AMP ‘Fast Blow’ glass fuse, 5mm ∅, 20mm long, Psion part number
A4900-0041.
4Remove the 2 screws from the base of the Workabout.
5Pull the Chassis Assembly from the case (this may require a sharp tug).
6If fitted, unclip the Expansion FFC from its ZIF Connector on the Main PCB and also from
the ZIF Connector(s) on the Expansion or Monitor PCB.
+Note:- Take care not to crease or tear the FFC.

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Workabout MX Service Manual
14 Version 1.0
Drawer Assembly
Main Power FFC
Drawer Locating Clips -
Derail from the Chassis
Expansion
FFC ZIF
Main Power
FFC ZIF
Chassis Assembly
7Unclip the Main Power FFC from its ZIF Connector.
8Unclip the Drawer Assembly by derailing the Drawer from its tracks.
9Slide the Drawer Assembly out of the Chassis Assembly.
+Note:- Dismantling the Latch Assembly is not necessary as replacement cases are
supplied complete with latches. The following step is for information only.
10 To remove the Latch Assembly, remove the 3 screws from the latch case. Be careful to
catch the internal springs and other components when you remove the case.
Dismantling the Chassis Assembly
1Remove the Drawer Spring from the Connector Block.
+Note:- The Drawer Spring should always be removed when you either remove or refit the
Connector Block.
2Remove the Bottom Connector Seal.
+Note:- As a general rule, replace the Bottom Connector Seal whenever it is removed for
servicing.
3Remove the 2 screws from the LIF Connector.