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A series of analysis and common malfunctions on devices Sanyo monitors

 A series of analysis and common malfunctions on devices Sanyo monitors

CTP 6457 79S Chassis = 2
CTP 5452 79S Chassis
CT 201 80S Chassis
CY 141 80S Chassis
CTP 4452G 80S Chassis
20E2KR-00 A3-C Chassis

Explanation on the CHASSIS 80 circuit

General explanation of the stages

The feeding circuit and its protection

consists of four switch-type transistors It includes a transformer called T501 CONVERTER, which is what distinguishes modern feeding circuits, and it is also possible to adjust the voltage output of the variable resistance VR501 and its value is one kilo and it has two main outputs, which is 110V B1 and the second 18V B2 specifically for sound output only

It is noted in this circuit that there is no stage dedicated to protection But choosing the value of the radiator resistance of the SWITCH Q504 power amplifier is its technical number R513 and its value of 0.33 Ohm is accurate, even if the drag increases, this reduces the circuit output in half or less, and the draw is often due to shortness or shortness in the horizontal stage. It may be accompanied by a sound indicating an abnormal pull and not a failure of the feeding circuit to produce voltage, but it does not disappear completely as in other types of devices.

The relationship of the nutrition department with the horizontal

1- In the event that the horizontal circuit does not work due to the presence of an opening in it, for example in the sense of not withdrawing or consuming, we find a large increase in the output of the supply circuit, up to 170 volts, which may arouse suspicion of the error of its operation, but this is a normal condition for this device,
2- In the case of a short circuit of the horizontal - Overdraft, the voltage drops by almost half, but it does not go away, and this is also reflected in the other voltage of 18 volts, so it decreases in half.

Interfrequency amplifier and video detector

The inter-frequency amplifiers are located within the work of the integrated IC101, and among its most famous components is also the T102 interchange frequency converter, as well as the SAW FILTER and the X101 number, which is an alternative piece for a number of filter circuits and the interface frequency for not interfering with the adjacent channels and confirming the required magnification and very rare failure until the technician

detector is occupied with it The visuals

inside the IC101 integrated also, and one of the most important parts of it is the resonance circuit in the form of an interchangeable frequency converter (IF), its number is T122, and the capacitor C124 in parallel on the outside of

the case.The agc circuit is

also inside the integrated ic 201, and one of the most important parts of it is the variable resistance vr102 called if agc and also the variable resistance vr101 called rf AGC and here it took the name tu agc, which means that it controls the voltage of the agc which feeds the tuner

aft circuit.

Also inside the integrated ic 101, and one of the most important parts of it is the resonance circuit t123 in the form of (if) outside it the capacitor c125

stage of visuals and

1- part of the integrated ic101 and its output on man No. 11
2- transistor q121 to output the visuals with several of the card at a man No. 12 of the frequency card The interface and the visuals, which are numbered if unit b4yb
3- part of the integrated ic301, which also includes a color circle, and the visuals enter the integrated through the delay line for the visuals l.371 to the legs 11, 10 and we can say that the rest of the visual stage is inside the integrated from the legs 9 to the 16 man and also the man 19 and related parts to be the final output of the visual stage from man No. 15 to the card final output of the visuals and crt unit number b4yb

the vertical stage

Includes part of the IC401 integrated leg numbers 6,7,8,10 and related parts as well as Q444 transistors. Q443. Q442 and the parts connected to it until the final output of the vertical deflection coils and the surrounding parts connected to

the horizontal stage and its automatic frequency adjuster afc and

1- an integral part ic401 terminals 16,3,2,1 and related parts and the most famous pieces are horiz osc.vb412 inside the device To adjust the frequency by the technician and also horiz hold vr906 outside the device for customer use and the effect is very little and also its downtime compared to the other
2- Q431.Q403 transistors, which is a rare case of the presence of such transistors within the AFC circuit
3- Q421 horizontal spur and transformer t421
4- q451 horizontal output amplifier and transformer t422 line and the transformer here includes a very high voltage uniform and of course not winding which includes the output of the focus voltage and the brightness of the common curtain network In a single segment, the vr 421 includes a variable resistance to the focus and a variable resistor for the blanket other than the fixed resistance inside the segment that is not marked by the circuit. This is for information - this is in contrast to the secondary voltages which are
A-Voltage of 40 volts, auxiliary voltage to the header other than the original voltage of the supply circuit of 110 volts, and this special case of the vertical phase must be taken into account.
B-Voltage of 15 volts that feeds most of the integrated circuits
C- Voltage of 180 volts that feeds transistors output color Tuesday

circuit ***** The very high voltage x-ray

in this device is not indicated on the circuit the details of the pulse coming out from the horizontal output transformer, but it is definitely the pulse entering to pin 16 of the integral coming mainly from the 6 pin in the line to the guide point w31 to the def sub unit b4h4 and the output from w32 To pin 16 in the integrated which is the same to operate the AFC circuit inside the integrated. This sample differs from many devices that standardize the pulse and convert it to a dc, use a zener, and then connect it to an x-ray circuit inside

the IC of the horizontal and vertical synchronization stage.

It includes terminals 14 for entering the visual signal to separate the synchronization in it and terminal 13 for exit of the synchronization pulses and entering them again to a terminal 11 for this header other than being used to operate waveform transistors q204.q203.q202

phase and

includes pin 9 inside iv 401 and also through pin 18 for ic 301 for square blk