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Great price, Quick delivery, the document was very usefull A+++++++++++++++
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Great price, Quick delivery, the document was very usefull A+++++++++++++++
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This service Manual for my JVC AV29BF10EES is very helful. Everything is show in detailed diagrams!!!! If you need really good source of information for this type JVC you are on the right place. I am satisfied and very glad for this excellent book. Thank you.
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Great service, great value like always!!!
Some of the writing is a bit blur but all is usable.
A+++++++++++++++++
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Great service manua!
Always great value and fast service A++++++++++++++++++
4. Connect an oscilloscope to the TP304 (IC301 Pin 36) blue * output.
CONTRAST ADJUSTMENT
5. Connect an oscilloscope (CHl) to the TP305 (IC301 pin 34) green output and (CH2) to the TP (IC301 pin 36) blue output. 6. Turn RV309 (SUB CONT B) to adjust the blue gain so that the positive polarity red signal step wave coincides with the positive polarity green signal step wave on the oscilloscope. 7. Disconnect pin 46 from pin 33 of IC301, and pin 45 from GND. The positive polarity signal and the negative polarity signal may not simultaneously coincide due to the variation.(Figures a and b) In this case, adjust these signals to an average value. (Figure c)
Procedure: 1. Short between IC301 pin-46 and pin-33, and between pin-45 and GND. (Short them at the same time.) Picture will show the white- compressed picture. 2. Input the 5- to 16-step black and white wave (stairstep) of the pattern generator (75 Sz and 1 Vp-p) to the A/V IN jack (J301). 3. Connect an oscilloscope (DC range 1 V/ DIV) to the TP305 (IC301 pin 34) green output. 4. Adjust RV307 (BRIGHT control) so that the black level obtains - 3.8V (line K).
A : 3.8 !I O.lVp-p
Figure b
Figure c
Negative
u-W
polarity Positive
polarity VIF ADJUSTMENT
5. Adjust RV301 (contrast) so that the white line obtains the GND potential (line M) (A = 3.8 t O.lVp-p). � 6. Disconnect pin 46 from pin 33 of IC301, and pin 45 from GND.
Note: These adjustments are not performed usually. Never
touch CT201 of adjusting device. While, only when CT201 have been replaced, make the following simple adjustment.
- Simple adjustment -
WHITE
BALANCE
ADJUSTMENT
Note: When performing this adjustment, set the direct
current drift .adjustment so that the direct currents on each channel of the oscilloscope is stabilized, and use the oscilloscope in this condition. Procedure: 1. Short between IC301 pin-46 and pin-33, and between pin-45 and GND. (Short them at the same time.) Picture will show the white - compressed picture. 2. Input the 5- to 16-step black and white step wave (stair -step) of the pattern generator (75 Sz and 1 Vp-p) to the A/V IN jack (J301). 3. Connect an oscilloscope (CHl) to the TP305 (IC301 pin 34) green output and (CHZ) to the TP504 (IC301 pin 32) red output. 4. Turn RV308 (SUB CONT R) to adjust the red gain so that the positive polarity red signal step wave coincides with the positive polarity green signal step wave on the oscilloscope. -7-
Procedure: Input the monochromatic gradation .wave from EXT ANT IN jack (JlOl). Connect an oscilloscope to Q314 emitter. Adjust CT201 so that the synchro signal is maximum (VIF adjustment). Receive the broadcasts of 2 to 13ch, and check if the screen is colored after the synchronism is stopped with each channel.
To / make maximum (VIF adjustment)
synchro chip
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