Haier 29T9D Service Manual page 47

both the forward and return strokes of TDA8350Q , the two power supplies being +16.5V and +46V
respectively.
Table 6 lists the pin functions and test data of TDA8350Q as the reference for maintenance. The data
is to be tested under the mode of 49.75MHz，PAL D/K and cylindrical color card, using a model
FLUKE 79Ⅲ instrument.
Table 6
Pin Function
1 Field pumping signal input in positive
phase VDP
2 Field pumping signal input in negative
phase VDN
3 FEEDBACK
4 SUPPLY VOLTAGE
5 OUTPUT VOLTAGE B
6 Blank pin
7 Ground
8 FLYBACK SUPPLY VOLTAGE
9 OUTPUT VOLTAGE A
10 Blank pin
11 Transmeridional
output
12 Transmeridional
input
13 Ground
2.8 Analysis of line sync and scan output circuit
As the line oscillation circuit is inside N201(TDA9384), no external line oscillation components is
needed and the oscillation frequency is under the control of PH-1 detector. A flow of luminance
signals including mixed syne signals is sent to a syne separation circuit therein, which separate line
and field syne pulse signals, among them, the line syne pulse signals are sent to PH-1 detector. The
PH-1 detector functions to synchronize the line oscillation frequency with the frequency of input
signals.
C221(472)、R226(15KΩ) and C222(1u) connected to N201(17) are PH-1phase-locked loop filters.
The line oscillation signals that have been corrected by PH-1 detector will be sent to PH-2 detector,
which functions to stabilize and control the phase of line drive pulse output for ensuring that the line
linearity and center remain unchanged.
The external capacitor C218(222) of (16) is a filter capacitor for PH-2 detector. Line pumping signals
are sent out by the (33) of N201 and fed into a line driving triode V402（KSC2331）, and then, after
being amplified by a triode V403 （2SD1887） switch, drive line deflection coil to produce magnetic field
to control an electronic beam for horizontal scanning.
47
correction signal
correction signal
Resistance to Ground R
Working
Forward
Voltage（V）
Test（Ω）
2.4 67.0K
2.4 69.9K
8.3 5.9K
16.9 6.4M
8.2 6.4K
0 ~
0 0
48.8 32.5K
8.6 5.9K
0.9 ~
11.1 10.4K
0.73 62.5K
0 0
Circuit Explanation
Back
Test （ Ω）
67.3K
70.3K
5.9K
2.4M
6.1K
~
0
25.5K
6.1K
4.1M
10.1K
62.9K
0