Схема телевизора Other Chassis 11AK18

Формат файла: PDF

DO NOT CHANGE ANY MODULE UNLESS THE SET IS SWITCH OFF
The mains supply side of the switch mode power supply transformer is live.
Use an isolating transformer.
The receivers fulfill completely the safety requirements.
Safety precautions:
Servicing of this TV should only be carried out by a qualified person.
- Components marked with the warning symbol on the circuit diagram are critical for safety and must only be replaced
with an identical component.
- Power resistor and fusable resistors must be mounted in an identical manner to the original component.
- When servicing this TV, check that the EHT does not exceed 26kV.
TV Set switched off:
Make short-circuit between HV-CRT clip and CRT ground layer.
Short C804 (150mF) before changing IC802 or other components in primary side of SMPS.
Measurements:
Voltage readings and oscilloscope traces are measured under following conditions.
Antenna signal 60dB from colourbar generator. (100% white, 75% colour saturation)
Brightness, contrast, colour set for a normal picture.
Mains supply, 220VAC, 50Hz.


PERI-TV SOCKET

SCART 1 (SC050)
SCART 2 (SC051)
Audio right output 0.5Vrms / 1K
1 Audio right output
0.5Vrms / 1K
Audio right input
0.5Vrms / 10K
2 Audio right input
0.5Vrms / 10K
Audio left output
0.5Vrms / 1K
3 Audio left output
0.5Vrms / 1K
4 Ground AF
Ground Blue
5 Ground Blue
Audio left input
0.5Vrms / 10K
6 Audio left input
0.5Vrms / 10K
0.7Vpp / 75ohm
7 Blue input
0.7Vpp / 75ohm
AV switching input 0-12VDC /10K
8 AV switching input
0-12VDC /10K
Ground Green
9 Ground Green
11 Green input
0.7Vpp / 75ohm
13 Ground Red
13 Ground Red
14 Ground Blanking
14 Ground Blanking
15 Red input
0.7Vpp / 75ohm
16 Blanking input
0-0.4VDC, 1-3VDC / 75ohm
17 Ground CVS output
17 Ground CVS output
18 Ground CVS input
18 Ground CVS input
19 CVS output
1Vpp / 75ohm
19 CVS output
1Vpp / 75ohm
20 CVS input
1Vpp / 75ohm
20 CVS input
1Vpp / 75ohm
INTRODUCTION
Ak18 is a 100Hz double scan color television capable of driving 28 4:3/16:9 and 33 4:3 picture tubes.
The chassis is capable of operation both in PAL, SECAM, NTSC playback color standards and multiple transmission
standards as B/G, D/K, I/I+, and L/L?. Sound system output is supplying 12W (10%Thd) for left, right and center outputs
of 8ohm speakers and 7W for 2 surround outputs of two 8ohm speakers. TV has Megatext or Tvtext teletext system.
The chassis is equipped with 1 full EuroScart, 2 other Scarts for AV input/output, front-AV/back-AV, headphone output,
SVHS input, VGA input, two external speaker output, one center speaker and two surround speaker outputs.