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Home >> DAEWOO >> 25G1ST Service Manual
 
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DAEWOO 25G1ST
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of DAEWOO 25G1ST Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 21 (click to view)
No 43

Name PHI-1 FILTER

Description The loopfilter connected to pin 43 is suitable for various signal conditions as strong/weak and VCR signal. This is achieved by switching of the loopfilter time constant by changing the PHI-1 output current. Via I2C bus FOA/B, different time constants can be chosen, including an automatic mode which gives optimal performance under varying conditions. To this pin are connected the IC-substrate and horizontal output. The EW drive is a current output. The output is single-ended and is fed directly to the EW-input terminal The vertical drive has a current output. The output is balanced which ensures a good common mode behavior with temperature and makes the output signal less sensitive for disturbances. The PLL frequency range is 32-60MHz with corresponding VCO frequency 64-120MHz. The IF input impedances is 2 in parallel with 3pF and matches the required load for commonly used SAW filters. A DC coupling is allowed, so no series capacitors between SAW filter and IF input are necessary. The input range for EHT tracking is 1.2 ~ 2.8V, for a compensation of +/- 5% on vertical and/or EW. The tracking on EW can be switched on/off by HCO. The overvoltage protection is activated when the voltage on pin 50 exceeds 3.9V typical. This pin requires a capacitor to ground of l00nF +/- 5%. The optimal sawtooth amplitude is 3.5V and is determined by the external capacitor and charge current. The sawtooth bottom-level is 2V. This pin requires a resistor to ground. The optimal reference current is 100 . which is determined by this resistor. The AGC capacitor value is 2.2 and has been defined for an optimal compromise between AGC speed and tilt for all AGC modes (negative/positive modulation). This output is used to control (reduce) the tuner gain for strong RF signals. The tuner AGC is an open collector output which is acting as a variable current source to ground. not used. This pin requires a capacitor of 10 connected to ground. The pin acts as a low pass filter needed for the DC feedback loop.

44 45 46 47 48 49

GROUND EAST-WEST DRIVE VERT DRIVE + VERT DRIVE IF INPUT

50

EHT/OVERVOLTAGE PROTECT INPUT

51

VERT SAWTOOTH CAPACITOR REFERENCE CURRENT INPUT AGC DECOUPLING CAPACITOR

52 53

54

TUNER AGC OUTPUT AUDIO DEEMPHASSIS DECOUPLING SOUND DEMODULATOR

55 56

20

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