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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 79 instrument.
Table 6
Resistance to Ground R
Pin Function
Working
Voltage V
Forward
Test
Back
Test
1
Field pumping signal input in positive
phase VDP
2.4 67.0K
67.3K
2
Field pumping signal input in negative
phase VDN
2.4 69.9K
70.3K
3 FEEDBACK
8.3
5.9K
5.9K
4 SUPPLY
VOLTAGE
16.9
6.4M 2.4M
5
OUTPUT VOLTAGE B
8.2
6.4K
6.1K
6 Blank
pin
0
~
~
7 Ground
0
0
0
8
FLYBACK SUPPLY VOLTAGE
48.8
32.5K
25.5K
9
OUTPUT VOLTAGE A
8.6
5.9K
6.1K
10 Blank
pin
0.9
~
4.1M
11
Transmeridional correction signal
output
11.1 10.4K
10.1K
12
Transmeridional correction signal
input
0.73 62.5K
62.9K
13 Ground
0
0
0
2.8 Analysis of line sync and scan output circuit
As the line oscillation circuit is inside N201(TDA9373), 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(15K ) 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.
Circuit Explanation
Содержание HP-2999
Страница 12: ...11 7 Net Dimension 790mm 525mm 590mm Net Dimension Figure 1 ...
Страница 30: ...29 c PCB Diagram Circuit Diagram Figure 6 ...
Страница 44: ...43 15 Exploded View EXPLODED VIEW OF CABINET PARTS Model HP 2999 Exploded View ...
Страница 66: ...65 ...