The ‘filament’ voltage is monitored for ‘no voltage’ or ‘excessive voltage’. This voltage is
rectified by diode 6447 and fed to the emitter of transistor 7443. If this voltage goes
above 6.8 V, transistor 7443will conduct, making the ‘EHT0’ line ‘high’. This will
immediately switch off the horizontal drive (pin 30) via the slow stop procedure.
The horizontal drive signal exits IC 7200 at pin 30 and goes to 7462, the horizontal
driver transistor. The signal is amplified and coupled to the base circuit of 7460, the
horizontal output transistor. This will drive the line output transformer (LOT) and
associated circuit. The LOT provides the extra high voltage (EHT), the VG2voltage and
the focus and filament voltages for the CRT, while the line output circuit drives the
horizontal deflection coil.
Vertical drive
A divider circuit performs the vertical synchronization. The vertical ramp generator
needs an external resistor (R3245, pin 20) and capacitor (C2244, pin 21). A differential
output is available at pins 16 and 17, which are DC-coupled with the vertical output
stage.
During the insertion of RGB signals, the maximum vertical frequency is increased to 72
Hz so that the circuit can also synchronize on signals with a higher vertical frequency
like VGA.
To avoid damage of the picture tube when the vertical deflection fails, the guard output
is fed to the beam current limiting input. When a failure is detected the RGB-outputs are
blanked. When no vertical deflection output stage is connected this guard circuit will
also blank the output signals.
These ‘’ and ‘V_DRIVE-‘ signals are applied to the input pins 1 and 2 of IC
7471 (full bridge vertical deflection amplifier). These are voltage driven differential
inputs. As the driver device (IC 7200) delivers output currents, R3474 and
R3475convert them to voltage. The differential input voltage is compared with the
Содержание 7629
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Страница 14: ...AV2 In SVHS Connector Kind Value Symbol 1 gnd v 2 gnd v 3 Y 1 Vpp 75 O j 4 C 0 3 Vpp 75 O j ...
Страница 16: ...Figure ...
Страница 18: ...Figure ...
Страница 20: ...Figure Panel Removal 1 Lift the board out of its bracket after releasing the 2 fixation clamps Figure ...
Страница 48: ...Hardware Alignments Figure Mono Carrier Top View LS ...
Страница 76: ...Power Supply Figure Figure ...
Страница 101: ...T8 7629 ...
Страница 102: ...T8 7629 ...
Страница 103: ...T8 7629 ...
Страница 104: ...T8 7629 ...
Страница 105: ...All Models 7629 PCB Locations ...
Страница 106: ...All Models 7629 Power Supply Diagram A1 ...
Страница 107: ...All Models 7629 Line Deflection Diagram A2 ...
Страница 108: ...All Models 7629 Frame Deflection Diagram A3 ...
Страница 109: ...All Models 7629 Tuner IF Diagram A4 ...
Страница 110: ...All Models 7629 Video IF And Sound IF Diagram A5 ...
Страница 111: ...All Models 7629 Synchronization Diagram A6 ...
Страница 112: ...All Models 7629 Control Diagram A7 ...
Страница 113: ...All Models 7629 Audio Amplifier Diagram A8 ...
Страница 114: ...All Models 7629 BTSC Stereo SAP Decoder Diagram A9 ...
Страница 115: ...All Models 7629 Audio Video Source Switching Diagram A10 ...
Страница 116: ...All Models 7629 BTSC NDBX Stereo Decoder Diagram A11 ...
Страница 117: ...All Models 7629 Front I O Control Headphone Diagram A12 ...
Страница 118: ...All Models 7629 Rear I O Cinch Diagram A13 ...
Страница 119: ...All Models 7629 PIP Interface Diagram A16 ...
Страница 120: ...All Models 7629 CRT Panel Diagram B1 ...
Страница 122: ...USED ONLY IN MODELS 27PS50B321 32PS55S321 32PS61S321 32PS55S331 7629 Side AV and Headphone Panel Diagram E1 ...
Страница 123: ...USED ONLY IN MODELS 27PS60S321 27RF72S325 32PS61S321 7629 PIP Panel Diagram P ...
Страница 125: ...USED ONLY IN MODELS PC0125C321 PC0127C321 7629 EPS Panel Schematic ...
Страница 126: ...USED ONLY IN MODELS PC0125C321 PC0127C321 7629 Card Interface Schematic ...
Страница 127: ...USED ONLY IN MODELS PC0125C321 PC0127C321 PL0125C321 PLW225S321 PRF227S325 7629 SP LS Panel Schematic ...
Страница 128: ...All Models 7629 Main Panel component side ...
Страница 129: ...All Models 7629 Main Panel copper side ...
Страница 130: ...All Models 7629 CRT Panel component side ...
Страница 131: ...All Models 7629 CRT Panel copper side ...
Страница 132: ...All Models 7629 Headphone Panel component side ...
Страница 133: ...All Models 7629 Side AV Panel component side ...
Страница 134: ...All Models 7629 PIP panel component side ...
Страница 135: ...All Models 7629 PIP panel copper side ...
Страница 136: ...All Models 7629 Top Control Panel component side ...
Страница 137: ...All Models 7629 EPS Panel PCB Top View only ...
Страница 138: ...All Models 7629 Card Interface Panel PCB Top View ...
Страница 139: ...All Models 7629 Card Interface Panel PCB Bottom View ...
Страница 140: ...MAIN CABINET EXPLODED VIEW ...