Bang & Olufsen BeoVision MX 4200 User manual

BeoVision MX 4200
Type 915x
On-site service guide
English, German, French, Italian, Spanish, Danish, Dutch
This On-site service guide must be
returned with the defective parts/
back-up suitcase !

Contents
1.1 Contents
2.1 English
3.1 Deutsch
4.1 Français
5.1 Italiano
6.1 Español
7.1 Dansk
8.1 Nederlands
9.1 Service mode & Main chassis in service position
10.1 Illustrations
11.1 Replacement of main chassis
12.1 Replacement of other modules
13.1 Overview of geometry parameter settings
13.1 Survey of modules
1.1
There is no Brief operation guide in this On-site service guide.
Instead an english version of the user guide is enclosed in the
back-up suitcase.

Contents, English 2.1
#1 Introduction
#2 Repair of BeoVision MX 4200
#3 Fault flow chart
#4 Removal of the cloth front
#5 Removal of the contrast screen and cleaning the television
#6 Adjustments after replacement of main chassis
#7 Check after replacement of main chassis or modules
#8 Service Mode and Flash-programming
9.1 Service mode
10.1 Illustrations
11.1 Replacement of main chassis
12.1 Replacement of other modules
13.1 Overview of geometry parameter settings
14.1 Survey of modules
Survey of symbols:
Make a shortcircuit between the marked points, usually for discharging
e.g. a picture tube
Push with finger, in arrow direction
Disconnect internal plug
Connect internal plug
Disconnect mains plug
Connect mains plug
Disconnect aeriel or other external plug
Connect aeriel or other external plug
Loosen/remove or fasten/install screw
Dashed arrow. Push/pull e.g. PCB, chassis etc. in arrow’s direction
Filled arrow. Refer to page/chapter for more information, e.g. 12.4 PCB51,
if mounted:
Turn to 12.4 PCB51 and remove or install PCB if such is mounted

2.2 Introduction, English
Warning
Static electricity may destroy the product!
A static-protective field service kit must always be used when replacecement of the
modules takes place. Follow the instructions in the guide and use the ESD mat
area for both the new and old modules.
Please note:
When mains voltage on the TV is required, remove the connection from the TV to
the ESD mat.
#1 Introduction
This On-site service guide explains how to service the BeoVision MX 4200 by
replacing the modules. In the following you will find repair tips, description of how
to replace the different parts and a description of how to adjust after servicing.
When the following symbol occurs; ➢it is a cross-reference to a photo or an
illustration in the back of this On-site service guide.
The chapters in the On-site service guide are named for example #2 Repair of
BeoVision MX 4200. They are listed numerically.
Please note:
This On-Site Service guide must always be returned with the defective parts.
#2 Repair of BeoVision MX 4200
Before troubleshooting is initiated, let the customer explain and demonstrate the
fault, if possible.
Afterwards, check:
- that all cables are plugged in correctly
- that the mains voltage is connected, and switched on
- that an aerial signal is connected
- that all external sources such as VTR, DVD etc. are connected correctly and
switched on. Use the enclosed IR-blaster if necessary in order to check IR-signals to
the external sources.
When troubleshooting is initiated, please refer to #3 Fault flow chart. The fault
should fit into one of the 4 main groups.
- System functionality
- Camcorder
- Picture
- Sound
Follow the arrows from each box, answering YES or NO, to locate the fault. The
back cover may have to be removed and the main chassis placed in service position.
See 9.1 Serviceposition 1 and 9.3 Main chassis in service position for further
information.
If measurements are needed, please refer to the chapter measurements, placed
behind #3 Fault flow chart.
When a voltage specification is given in the fault flow chart, a value within ±10-20%
of this is OK.
STATIC ELECTRICITY
MAY DESTROY THE
PRODUCT
ESD
PCB xx
ESD-Mat

Introduction, English 2.3
When replacing a module, remember to disconnect the mains voltage. Carry out
the replacement, and reconnect the mains voltage. Then check if the fault is
rectified.
When replacing the main chassis remember to transfer optional modules, such as
Modulator etc. to the new main chassis. Please do also remember carefully
remove the EEPROM 6IC6 (by using IC-pliers (3629145)) from the defective chassis
and place it in the new chassis.
An extra help in troubleshooting is reading out the error codes.
Please refer to #8 Survey of Error Codes for further information.
After repair of BeoVision MX 4200, always remember to follow #6 Adjustments after
replacement of main chassis and/or #7 Check after replacement of main chassis or
modules.
PIN-code active prior to service.
If the PIN-code is not deactivated prior to service you must use the Service code to
unlock the product.
Service code
The service code
- unlocks the product, but does not affect the pin-code setting
- gives you 12 hours service time
Entering the Service code.
1. When the product asks for PIN-CODE press and hold lfor 3 seconds.
2. The Master code menu appears
3. Enter the Service code: 1 1 1 1 1.
Important notice concerning Service time.
The service time is active as long as the product is connected to the mains,
including Standby.
To obtain maximum service time:
Only connect the product to the mains while you are performing actual service on
the product.
When the service time is expired, the product can only be unlocked by entering
the PIN-code or the Master code.
Registration of the modules.
The modules will be registered to the product in the following situations :
- the product has been connected to the mains for more than 12 hours, including
Standby time.
- the PIN-code is activated or deactivated.
PIN-code deactivated by customer prior to service.
With the PIN-code deactivated prior to service you must be aware of the modules
will be registered to the product in the following situations :
- the product has been connected to the mains for more than 12 hours, including
Standby time.
- the PIN-code is activated or deactivated.
The registration of modules in the product can only be changed at Bang &
Olufsen, Struer.

2.4 Fault flow chart, English
Remote Control
Try with a new
Beo4
OK?
Replace main
chassis
OK?
Replace PCB11
Replace batteries in
old Beo4
OK?
Replace Beo4
No standby light
Check mains
voltage. Check if
mains switch on
the TV is on
OK?
Turn on mains
voltage or turn
mains switch on
the TV on
Replace main
chassis
OK?
Replace PCB11
System-
functionality
No
Yes
#3 Fault flow chart

Fault flow chart, English 2.5
Connect, if
possible, a new
ML-cable between
the products
OK?
Check last ML error
in service menu. Is
the statement NO?
Replace
main chassis
OK?
The TV should be
taken to a
workshop for repair
Replace the
ML-cable
OK?
Switch off both
audio- and video
products. Wait one
minute and then
switch on. Check
for correct
“options” OK?
MasterLink
problem
check if possible that ML-
audio master and/or ML-link
products are ok
No
Yes
Leave the TV on for
10 minutes. If error
recurs, replace
PCB51
OK?
Replace
PCB51
OK?
Camcorder
No camcorder
sound and/or
picture
Check connections
to camcorder
OK?
Replace the
defective
connection
Replace PCB59
OK?
Replace main
chassis
OK?
The TV should be
taken to a workshop
for repair
No
Yes

2.6 Fault flow chart, English
No
Yes
Can focus be
adjusted on focus
potentiometer until
OK?
#6
Poor focus
Adjust the TV by
means of
adjustment guide
OK?
#6
Replace main
chassis
Readjust focus
OK?
The TV should be
taken to a
workshop for
repair
Picture tube may
be defective
Leave the TV on for
10 min. If error
reoccurs, replace
main chassis
OK?
Can picture be
obtained by
adjusting
G2-potentiometer?
#6
No picture
Adjust the TV by
means of
adjustment guide
OK?
#6
Replace main
chassis
OK?
The TV should be
taken to a
workshop for repair
Picture tube may
be defective
Leave the TV on for
10 min. If error
reoccurs, replace
main chassis
OK?
Change to correct
settings
Check colour
settings in service
mode
OK?
No colour(s)
Replace main
chassis
OK?
The TV should be
taken to a
servicecenter for
repair
Picture tube may be
defective
Picture
Check aerial connection

Fault flow chart, English 2.7
No
Yes
Noise in picture
(TV)
Replace main
chassis
Poor geometry
Can picture be
adjusted by means
of the adjustment/
check guide?
#6
Replace main
chassis
OK?
The TV should be
taken to a
workshop for
repair.
Picture tube may
be defective
Leave the TV on for
10 min. If error
reoccurs, replace
main chassis
OK?
Replace main
chassis
No teletext
No auto contrast
Replace main
chassis
OK?
Replace PCB11

2.8 Fault flow chart, English
No
Yes
Sound
Check aerial connection
No sound in
internal
loudspeakers
Are both left/right
without sound?
Find channel in
speakertable and
measure.
Measurement OK?
Replace speakerbox
Replace main
chassis
Disconnect 10P32
OK?
The TV should be
taken to a
workshop for repair
Replace PCB59
No bass
or
no treble
Are both left/right
without bass or
without treble?
Find speakerunit in
speakertable and
measure.
Speakerunit OK?
Replace speakerunit
or speakerbox
Replace main
chassis
OK?
Replace speakerbox
Replace main
chassis
OK?
Replace speakerbox
Replace main
chassis
OK?