Matsui 28N03, 4400 Schematic
CHASSIS Pro 4400
BUSH
3463NTX
3472NTX
WS6667
WS7667
WST66
GRUNDIG
T70-1020
WF82-3020
MATSUI
28N03
32WN03
ORION
3850
TV2844W
TV4400NTX
DECCA / TATUNG
D28N440
D28W440
D28W441
T21N421
T25N440
T28N440
T32W440
T32W441S
and many others
Chassis Pro 4400
General Information
Used in Bush, Goodmans, Grundig, Matsui, Orion, Tatung, etc
without any prior programming and a new
Service Adjustments
Power supply
Use potentiometer PP1 to adjust the HT for
151V ± 0.5V for 16:9 tubes at the TSP28
terminals.
Activating service mode
1. Switch on the appliance whilst holding down
the MENU key at the cabinet controls until the
red LED lights up.
2. Release the MENU button at the cabinet and
press the standby key on the remote control.
The appliance will default to programme 1, or
to AV1 if pin 8 of SCART 1 is connected to a
voltage of ±12V. It is therefore important to
make certain that the test signal needed to
make the adjustments is available either on
programme 1, or on the SCART 1 input, as
selection of the sources is not possible
thereafter in service mode.
3. The functions that can be adjusted (listed
below) are selected using the P+ and P—
keys on the remote control and the adjustments then made with the Volume ± keys. It is
advisable to make a note of initial values
before making any changes so that they can
be restored if necessary.
In the event of replacing the NVM memory or
the microprocessor, it is essential to make all
the adjustments accessible in service mode,
since the replacement memory is supplied
Recommended Safety Parts
Item Part No. Description
S068055309 Mains switch
S092503809 Mains cable
S060328549 CRT 28” W66EHU013X010
CP1 S030242209 Capacitor 220n, 250VAC
CP3 S030242209 Capacitor 220n, 250VAC
RC45 S044010109 Fusible resistor 1R
RS22 S044010479 Fusible resistor 4R7
RS41 S044011009 Fusible resistor 10R
RL8 S044011509 Fusible resistor 15R
RL18 S044013309 Fusible resistor 33R
RV19 S044013309 Fusible resistor 33R
RR53 S047501009 Fusible resistor 1R SMD
RR64 S047502209 Fusible resistor 2R2 SMD
RS33 S047504709 Fusible resistor 4R7 SMD
RS52 S0475 10009 Fusible resistor 10R SMD
RF8 S048002209 Fusible resistor 2R2
RF9 S048002209 Fusible resistor 2R2
RE15 S048222009 Fusible resistor 2k2
RL16 S048222009 Fusible resistor 2k2
RP1 S053051009 Safety resistor 1M VR37
RP21 S053210709 Safety resistor 4M7 VR68
ICP2 S063411019 I.C.TCD T 1101 GB
TRL1 S065621409 Flyback transformer 110° (Eldor)
TRL1 S065621419 Flyback transformer 110° (Orega)
TRP1 S065708009 Power switch transformer (Eldor)
TRP1 S065708009 Power switch transformer (Orega)
LP1 S06654 1709 Line filter
RV19 S047033009 Fusible resistor 33R
CNV3 S070001209 CRT socket
S067203419 Degauss coil
S068055319 Mains switch (D25N440)
S092503809 Mains cable (D25N440)
S060325219 CRT 25” A59EHJ43X31 (D25N440)
S067202019 Degauss coil (D25N440)
S068055319 Mains switch (T28N440)
S092503809 Mains cable (T28N440)
S060328029 CRT 28” A66EAK071X01 (T28N440)
S067202119 Degauss coil (T28N440)
S068055309 Mains switch (T32W440)
S092503809 Mains cable (T32W440)
S060332009 CRT 32” W76EDX013X010 (T32W440)
S067203319 Degauss coil (T32W440)
microprocessor requires initialization.
1. IF video setting (IFxx AFCxx)
This adjustment requires special equipment and
will be needed only for the ICC2 N1 version,
which is also recognisable by the presence of
the LC7 coil. If the coil is present, adjust IF and
AFC to the values given on the label affixed to
the left side of the main PCB so that a suitable
approximation is achieved. If the coil is not
present, adjust as follows:
IF 50
AFC 3
2. Initialization (INIT CTV 831 x (VERSION)
The initialization procedure, which also indicates
the software version for the microprocessor, is
enabled with the Volume + key and must be
carried out whenever the NVM memory or the
microprocessor is replaced. Bear in mind that
initialization has the effect of erasing all data
from the memory except for the bytes option.
3. Screen grid voltage (Vg2 Test)
Having selected the function, press the Volume
+ key. A luminous horizontal line appears in the
middle of the screen. Adjust potentiometer G2
on the EHT transfonner so that the line is just
visible (in a dimly lit room). Then press Volume
— and wait for a few seconds until service mode
is restored.
4. Control bytes (Cox)
These are control registers that must be set as
follows:
Co4 00
Co3 27
Co2 96
5. Option bytes (Opx)
The correct values to set for each appliance are
given on the label on the back cover alongside
the notations Op3, Op2 and Op1.
6. Audio/stereo A2 decoder (LA/SA)
The LA and SA functions allow adjustment of the
separation between the right and left audio
channels, and of the respective levels. An RF
stereo generator is therefore required. Disconnect modulation to the left hand channel and
adjust LA to give 1.4Vp-p at pin 1 of the SCART
1 connector. Then adjust SA for the minimum
residual signal at pin 3 of SCART 1. If a stereo
generator is not available, set LA to 01 and SA
to 0B to obtain a fair approximation.
7. Setting the luminance/chrominance delay
(Yx)
The delay must be adjusted to the following
values:
Vp 18 (PAL) (UK VERSIONS)
Vs 30 (SECAM)
Vn 20 (NTSC)
Yo 22 (SCART)
The Yn function is only accessible if the signal is
NTSC coded (standard accepted only by
SCART)
8. On screen display (OSD)
Load the fixed value 3F.
(AUDIO MENU APPEARS)
9. White control (WB/WG/WR)
Using a black and white bar signal, adjust to
obtain a correct grey scale.
10. Horizontal geometry (TC/CP/PW/EW/HSH)
There are two groups of these functions, one for
4:3 format (suffix 4) and one for 16:9 format
(suffix 16), both of which must be adjusted
because they are used in the zoom function (4:3
tubes included). The functions of the single
parameters are as follows:
TC Trapezium correction
(The four adjustments appear in 4x3 and 16x9)
CP Corner parabola correction
PW Parabola correction
EW Horizontal amplitude
HSH Horizontal shift
In the case of 4:3 format picture tubes, enter
EW16 = 3F to ensure proper zooming.
11. Vertical geometry (SC/VSH/VA/VS)
Vertical geometry is adjusted starting with the
VS (vertical slope), which is set so that the
central horizontal line of the test signal is exactly
at the boundary between the visible image and
the black part below and must not then be
changed again. The functions of the single
parameters are as follows:
SC Vertical S-correction (linearity)
VSH Vertical shift
VA Vertical amplitude
VS Vertical slope
12. AGC tuner setting (AG)
With a signal of lmV applied to the aerial input
on an UHF channel, adjust to 4Vdc at pin 1 of
the tuner.
13. De-activating service mode
Once all the necessary adjustments have been
made, press TV or MENU OFF on the remote
control to save all the changes and return the
appliance to normal operating mode.
W aveforms
Chassis Pro 4400
Audio Nicam Diagram
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