3.
3.1
3 . 2
a .
b.
3 . 3
3 . 4
3 . 5
Adjustments on the PIP module
3 . 6
SECAM identification for PIP modules with
(Fig. 7.4)
T D A 4 5 5 4
Adjustment conditions
Before making each adjustment, ensure that a PIP
picture with the prescribed signal is visible on the
screen and that the unit has reached its operating
temperature (after 10 min.).
Connect a pattern generator and supply a SECAM
colour bar signal.
Connect pin
125 to pin
125.
Connect an oscilloscope to pin 21
Set 5190 to minimum DC level.
Remove the interconnection.
Horizontal synchronization
Do not supply an aerial or generator signal.
Connect pin
125 to pin
125 if
TDA4554 is present (PAL selection). Connect pin
to earth.
3 . 7
SECAM demodulators for PIP modules with
T D A 4 5 5 4
Measure the frequency at pin
and using
3239 set it to 15.625 Hz 25 Hz.
Remove the interconnection.
Connect a pattern generator and supply a SECAM
signal without contents (black). Connect pin
to pin
125. Connect an oscilloscope
to pin 1
125. Using 5175, set the DC level
during the scan equal to the DC level during the
,
Chroma
filter
Adjustment for PIP modules with TDA4554
Connect a signal generator (e.g. PM 5326) to pin
10 of P17 and set its frequency to 4.286
VPP.
Connect pin
125 to
125. Connect an
oscilloscope to pin
125.
Set 51 18 to maximum amplitude.
Remove the interconnection.
In the same way set 5170, but now measure at pin
125.
Remove the interconnection.
4.
Adjustments on the picture tube
module
4.1
Picture width
Set using potentiometer 3525.
Adjustment for PIP modules with TDA4510
Connect a signal generator (e.g. PM 5326) to pin
10 of P17 and set its frequency to 4.43
Connect an oscilloscope to pin
126.
Set 5118 to maximum amplitude.
4 . 2
East/West correction
Set using potentiometer 3521. This setting is only
for 25” and 28” units.
.
PAL chroma auxiliary oscillator
Connect a pattern generator and supply a PAL
colour bar pattern. Connect pin
125
or pin 1 1
126
to earth.
Set 2202 so that the colour of the PIP picture is
practically still.
Remove the interconnection.
NTSC chroma auxiliary oscillator for PIP modules
w i t h T D A 4 5 5 4
Connect a pattern generator and supply an NTSC
M colour bar pattern. Connect pin
125 to
earth. Set 2202 so that the colour of the PIP
picture is practically still.
Remove the interconnection.
Delay line
Connect a pattern generator and supply a PAL
colour bar signal. Connect the X-input of the
oscilloscope to pin 1
125
or pin
Connect the Y-input of the
oscilloscope to pin
125
or pin
126 (TDA45 10). Set the oscilloscope to the
X-Y position.
Set 5 155 and 5157 so that the vectors lie in one
line (points which are furthest from the origin).
Set the pattern generator to the “DEM” mode.
Set R3 157 so that the vectors lie on top of one
another in the origin.
PCS 59 759
GB
