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AIWA TVCN202
Service Manual


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

Description of AIWA TVCN202 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.

The manual is available in languages: English

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Text excerpt from page 29 (click to view)
3. TUNER ADJUSTMENT 3-1. AGC Adjustment
(3) Using a DC power supply, add DC3.0V ± DC0.2V of voltage to the IC301 Pin10 (TP14). (4) Make adjustments with L203 so that the waveform’s center section (a section in the figure below) of the ALIGNMENT SCOPE becomes 45.75 MHz ± 50 kHz. (1) Receive a NTSC signal of RF INPUT under the following conditions. Input level: 58 dBµ Modulation percentage: 87.5% Received channel : US TV 10ch (fp = 193.25MHz) (2) Adjust SFR201 so the voltage at the TU101 Pin1 (TP15 or JW101) is 6.8V ± 0.2VDC. (Simple Adjustment Method) (1) Using the LEADER LCG-401 (65dBµ), receive the color bar signal on channel 2. (2) With SFR201, make adjustments so that the voltage of TU101 pin1 becomes 3.6VDC. (3) Receive a television broadcast, and verify that the screen is clear.

45.15

46.35

a
47.75MHz

3-2.

VCO Adjustment

(5) Remove the capacitor.

( Rough Adjustment ) (1) Make connections as they appear below.

3-3.
AC POWER SUPPLY TU 101 Pin ! (TP2, IF)
10 TP14

AFT Adjustment

(1) Connect the resistance of 1 kΩ between the TU101 Pin11 and the GND.

TU 101 11 TP2 1kΩ

ATT

IC301 44 TP12

LSW – 480 VIF

ALIGNMENT SCOPE

(2)

Connect between Pin52 and GND of IC301 with capacitor.

(2) Input the following signal conditions to the TU101 Pin11. (AM/FM SSG) CARRIER 45.75 MHz LEVEL 100 dBµ MOD OFF (3) Make adjustments with L206 so that the voltage of the IC301 Pin47 (TP16) is DC4.5V ± DC0.2V. (4) Remove resistance (1 kΩ). ( Simple Adjustment Method )

IC301 52 + CAP, 10/50 + C207 0.47/50

(1) Using the pattern generator LCG-401, receive the signal for channel 2. (2) Adjust L206 so that the voltage at IC301 Pin47 (TP16) becomes 4.5V ± 0.3VDC. (3) Receive each television broadcasts and vertify that the picture is clear.

33

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