(Diagram F1) - Philips EM5E AA Service Manual

consist of sport, film, culture, etc. and are determined from
the station side.
NexTView does not have to restrict itself to information about
the station that is being viewed, but also offers information
about other stations. In the various summaries, three different
commands can be given for the various program overviews.
These commands appear as follows:
• WATCH: The set immediately switches over to the station
concerned.
• REMINDER: The start time and date and the station of the
program concerned are stored in the TV reminder list. The
TV will give an OSD-message with the program
information, or switch on the set at the correct moment
(provided the set is in Standby) and tune to the station
concerned.
• RECORD: The timer of the video recorder with 'Easylink
Plus' is programmed with the data of the program
concerned. There has to be a video recorder (with Easylink
Plus) connected to SCART2 otherwise the 'RECORD'
function will not be highlighted. The connection is via pin 10
from SCART. This means that it has to be a full SCART or
at least pin 10 has to be wired.
In order to be able to realise NexTView, two teletext type data
flows, Data stream 1 and 2, are transmitted with various sub-
code pages of information. This data flow can transport limited
information (max. 40 pages). Data stream 1 is quick repeating
with a repetition time of approximately 20 to 30 seconds.
However, Data stream 2 has a much longer repetition time of
approximately half an hour and has a large transport capacity.
• Data stream 1 contains information of the station that is
being viewed.
• Data stream 2 contains up to one week of advance
information from various stations that are covered by the
provider.
9.14 CRT Panel / Rotation
9.14.1 RGB Amplifiers (Diagram F1)
To Auto Scavem
+12V
7314
'B'
4423
5030
3511
3510
Figure 9-23 (RG)B signal path
The RGB signals from the HOP are fed to three identical
amplifiers (TDA6118) on the CRT panel. We take one of them
(B, connector 1940 pin 9) as example for the description.
After emitter follower TS7314, the signal is fed to TS7315. This
emitter follower sends the signal, with the same DC-voltage, to
the RGB amplifier (IC7350, pin 3). In order to cope with the
higher definition, this IC has a larger bandwidth as the ones
used in the EM3E. Via outputs 5, the cathodes of the picture
tube are driven.
The supply voltage for the amplifiers is 200 V and is derived
from the LOT.
Circuit Descriptions and Abbreviation List
3512
3514
4405
To TDA6118
(pin 3)
7315
3513
5307
2334
CL 26532041_073.eps
9.14.2 Rotation (Diagram A5)
In sets with a rotation coil (wide screen sets), the amount of
frame rotation is adjusted with the 'Tilt' DAC-output of the HOP
pin 25 (see also 'Vertical Deflection').
9.15 Auto Scavem (Diagrams SC1 and F2)
9.15.1 Introduction
To improve the sharpness, the Scan Velocity Modulation
(Scavem) circuit modulates the deflection speed as a function
of the picture contents. This feature uses a separate Scavem
deflection coil.
Auto Scavem is introduced, to be able to display the high
definition signal from the FBX7. As the Scavem circuit is now
controlled by the Auto TV software, it is called Auto Scavem.
The circuit, with the Scavem amplifier, is located on a separate
PWB (parallel to the SSB), and is connected to the picture tube
panel.
9.15.2 Normal Scavem
R
Matrix
G
B
Coring
With normal Scavem (as used in the EM3E), the RGB signals
are added together and differentiated before they drive the
Scavem coil. The coring block prevents that Scavem
processing is done on low signal levels.
170402
EM5E
Differen-
Coring
tiator
Scavem
action
No coring
Differentiator
slope
Transition
Figure 9-24 Normal Scavem
9. EN 121
To
Output
SVM
stage
coil
To
SVM
coil
CL 16532149_088.eps
131201