All electrical adjustments should be performed
under the following conditions:
• Power supply voltage: 240V ±10%,50Hz ± 5%.
• Warm-up time: 10 minutes
• The voltages and oscillograms are measured
in relation to the tuner earth.
• Test probe: Ri> 10MΩ2; Ci <2,5 pF.
1. Adjustments on the large signal panel
1.1 95V/140V supply voltage
For 21” TV-sets
Connect a volmeter to the cathode of D6567.
With the aid of R3532 adjust the power supply
voltage to 95V ± 0,5V.
For sets > 21”
Connect a volmeter to the cathode of D6567.
With the aid of R3559 adjust the power supply
voltage to 140V ±1v.
1.2 VG2 adjustment
Connect a pattern generator displaying a full
black picture. Switch the TV-set to the service
default mode (see 7.4). Connect an oscilloscope
to the picture tube cathodes for red, green and
blue (pins 6, 8 and 11 of the picture tube
socket). Set the oscilloscope to DC, 50V/div and
2 mS/div. Measure the DC level of the measuring pulses at the end of the frameblanking (see
Fig. 7.1) Using the Vg2 potentiometer on the line
transformer (bottom potentiometer) the measuring pulse with the highest level must be set to
+160V ± 2V.
Fig. 7.1
1.3 Focusing
Is aligned using the focus potentiometer on the
linetransformer (top potentiometer).
2. Alignments on the small signal panel
2.1 40.4 MHz IF filter
(only for sets with SECAM LL’ reception)
Using a signal generator (b.v. PM5326) and a
capacitor of 5,6 pF supply a 40,4 MHz signal ton
pin 17 of the tuner. Connect an oscilloscope to
pin 1 of filter 1016. Switch on the set and set the
system selection (installationmenu) to BG. Set
L5117 for minimal amplitude. Remove the
supplied signal.
2.2 AFC
Switch the set to service default mode (see 7.4).
Using a pattern generator (e.g. PM5518) supply
a signal on a frequency of 475,25 MHz.
Align coil L51 14 for optimal picture quality.
2.3 Picture demodulator
(only for sets with SECAM LL’ reception)
Using a signal generator (eg. PM5326) supply a
32.95 MHz signal via a 5,6 pF capacitor to pin
17 of the tuner.
Align the signal level of the generator so that the
DC-voltage on pin 5 of the tuner is 5V. Switch on
the set and set the system selection (installation
menu) to system LL’. Align capacitor C2106 for
minimal voltage on pin 5 of the tuner. Remove
the supplied signal.
2.4 RF-AGC
If the signal of a strong local transmitter is
distorted, align the value for AX (AGC crossover) in the service menu (see 7.4) until the
picture is no longer distorted.
2.5 Audio demodulator
(not for sets with LL’ and NICAM reception
possibility)
Using a signal generator (eg. PM5326) supply a
38.9MHz signal via a 5,6 pF capacitor to pin 17
of the tuner. Connect an oscilloscope (2ms/div)
to pin 12 of IC7033 (TDA3845). Align coil L5030
for minimal amplitude. Remove the supplied
signal.
3. Adjustments in the service menu (see 7.4)
3.1 White balance
Alignment without a colour temperature meter
Connect a pattern generator and select a white
picture. Switch on the servicemenu (see 7.4)
and using the keys go to the GD setting.
Using the keys, set GD to 50. Go to
➝
➝
➝
➝
setting RD, and set it to 57. Go to setting BD,
and set it to 45.
If necessary change the settings for RD and BD
for a correct white balance.
Alignment with a colour temperature meter
Switch on the service menu (see 7.4) and go to
the GD, RD and BD settings using the keys.
Set all three values to 32 using the keys.
➝
➝
➝
➝
Connect a pattern generator and select a green
field. put the probe onto the screen, and set the
meter to NIT (cd/m2 ) measurement. Go to the
GD adjustment and set it to:
• 21: 350 NIT ± 10 NIT
• 25/28 black matrix : 270 NIT ± 10 NIT
• 25/28 Blackline-S: 300 NIT ± 10 NIT
Now select a white picture and suing the RD
and BD alignments adjust for the following
values:
•x = 0.299
•y = 0,308
3.2 Options
Go to the service mode (see 7.4). The following
options can be selected using the keys, and
➝
➝
can be controlled
➝
using the keys.
➝
• NI: NICAM present
(IC7353 = M5P3410)
• UO: UHF only (tuner = U944)
• LL: System secam LL’ possible
(coil 5117 present).
• TT: Teletext available
(IC7702 present)
• ET: East-european teletext.
• E2: Second Euroconnector present.
3.3 Geometry adjustments.
Supply a geometry adjustment pattern.
Go to the service menu (see 7.4). the following
adjustments can be selected with the keys,
and can be adjusted using the keys.
➝
➝
➝
➝
•VP: Vertical Shift
Set this for the correct vertical position.
•VA: Picture height
Set this for the correct picture height.
•VL: Vertical linearity.
Set this so that the vertical centre of
the picture is at the centre of the tube.
•VS: Vertical S-correction
Set this so that the height of the
squares in the top of the picture equal
the height in the bottom of the picture.
•HD: Horizontal shift.
Set this so that the horizontal centre of
the picture is on the centre of the tube.
For sets with a screensize larger than 21”, the
following alignments can be done as well. For
21” sets these alignments have no function.
•HW : Horizontal Width
Align the picture width with this.
•HP: East-west correction
Set this so that the vertical lines at the
sides of the screen are straight.
•HC: East-west corner-correction.
Set this so that the vertical lines are
straight in the corners.
•HT: Trapezium correction
Set this so that the vertical lines are
as vertical as possible.
Electrical Adjustments / Safety Parts / Service Notes / Controls Diagram / CRT Diagram / Euroconnector 1 & 2 / Fault Finding Tree ...(16:9) / Front Control Diagram
Power Supply Diagram / Power Supply Diagrams (21” 16:9) (25/28”/16:9) / 16:9 Module Diagram / Small Signal Panel / Sound IF Diagram / Text Diagram / Sync. Diagram
• The power supply circuit diagram that is
divided into two separate parts:
• 21” power supply circuit diagram
- power supply circuit diagram for 25” and 28”
• fault-finding tree for repairing the television
because:
- the error register in the service menu is not
filled in sets bearing code QG00 for the
Netherlands and Italy. For all other countries
the error registers in the service menus of
sets bearing code QG03 and lower is not
filled.
• Introduction of two new features, 16:9 module
and WSSB (wide screen signalling bit
detection) module, with accompanying copper
track layout and spare parts list with accompanying diagram.
Description of the new features in the MD1.1
TV set.
The WSSB enables the TV set to switch
automatically to the various display formats
(16:9 letterbox, 14:9 letterbox, 4:3) using
signalling bits. The signalling bits are transmitted in line 23 of the video signal. IC7119
(TDA8366) is used to match the convergence to
the various formats in cooperation with the 16:9
panel.
1. MD1.1 E 28” WideScreen
The information published in the Service Manual
and SI MD1 .1 -E 95.01 is also valid for MD1 .1
E 28” WideScreen sets. However, there is some
diversity in the spare parts list (See Table 1).
2. Microprocessors
The listed microprocessors (Table 1) can be
used for “24” and “28” Widescreen MD1.1 E sets.
When the µPs are used in a “28” WS set, the
option “28” in the Service Alignment Menu
should be set to “Y”. When the µPs are used in
a 24” WS set, the option “28” should be set to
“N”.“28 N” is the default value of these µPs after
replacement.
3. Mechanics
The mechanical execution of the WideScreen
sets (24” and 28”) differs from the other MD1 .1
E sets. Service positions and other mechanical
intructions are described in the MD1 .2E Service
section (Styling with top control and side input/
output).
Table 1
ITEMDESCRIPTIONSERVICE CODE
LARGE SIGNAL PANEL
F15012183.15 (3.15A)4822 070 33152
In a number of MD1 .1 E sets, a Black Stretch
panel [F] is used. This panel increases the detail
of dark parts of the picture. The schematic, layout and spare parts list of this panel are
published in this SI.
Electrical Adjustments / Safety Parts / Service Notes / Controls Diagram / CRT Diagram / Euroconnector 1 & 2 / Fault Finding Tree ...(16:9) / Front Control Diagram
Power Supply Diagram / Power Supply Diagrams (21” 16:9) (25/28”/16:9) / 16:9 Module Diagram / Small Signal Panel / Sound IF Diagram / Text Diagram / Sync. Diagram
Power Supply Diagram / Power Supply Diagrams (21” 16:9) (25/28”/16:9) / 16:9 Module Diagram / Small Signal Panel / Sound IF Diagram / Text Diagram / Sync. Diagram
Power Supply Diagram / Power Supply Diagrams (21” 16:9) (25/28”/16:9) / 16:9 Module Diagram / Small Signal Panel / Sound IF Diagram / Text Diagram / Sync. Diagram
Power Supply Diagram / Power Supply Diagrams (21” 16:9) (25/28”/16:9) / 16:9 Module Diagram / Small Signal Panel / Sound IF Diagram / Text Diagram / Sync. Diagram
Power Supply Diagram / Power Supply Diagrams (21” 16:9) (25/28”/16:9) / 16:9 Module Diagram / Small Signal Panel / Sound IF Diagram / Text Diagram / Sync. Diagram
Power Supply Diagram / Power Supply Diagrams (21” 16:9) (25/28”/16:9) / 16:9 Module Diagram / Small Signal Panel / Sound IF Diagram / Text Diagram / Sync. Diagram
Power Supply Diagram / Power Supply Diagrams (21” 16:9) (25/28”/16:9) / 16:9 Module Diagram / Small Signal Panel / Sound IF Diagram / Text Diagram / Sync. Diagram
Power Supply Diagram / Power Supply Diagrams (21” 16:9) (25/28”/16:9) / 16:9 Module Diagram / Small Signal Panel / Sound IF Diagram / Text Diagram / Sync. Diagram
Power Supply Diagram / Power Supply Diagrams (21” 16:9) (25/28”/16:9) / 16:9 Module Diagram / Small Signal Panel / Sound IF Diagram / Text Diagram / Sync. Diagram
Power Supply Diagram / Power Supply Diagrams (21” 16:9) (25/28”/16:9) / 16:9 Module Diagram / Small Signal Panel / Sound IF Diagram / Text Diagram / Sync. Diagram
Power Supply Diagram / Power Supply Diagrams (21” 16:9) (25/28”/16:9) / 16:9 Module Diagram / Small Signal Panel / Sound IF Diagram / Text Diagram / Sync. Diagram
Power Supply Diagram / Power Supply Diagrams (21” 16:9) (25/28”/16:9) / 16:9 Module Diagram / Small Signal Panel / Sound IF Diagram / Text Diagram / Sync. Diagram
Power Supply Diagram / Power Supply Diagrams (21” 16:9) (25/28”/16:9) / 16:9 Module Diagram / Small Signal Panel / Sound IF Diagram / Text Diagram / Sync. Diagram
Power Supply Diagram / Power Supply Diagrams (21” 16:9) (25/28”/16:9) / 16:9 Module Diagram / Small Signal Panel / Sound IF Diagram / Text Diagram / Sync. Diagram
Power Supply Diagram / Power Supply Diagrams (21” 16:9) (25/28”/16:9) / 16:9 Module Diagram / Small Signal Panel / Sound IF Diagram / Text Diagram / Sync. Diagram