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I will definitely be back for more information when I need it.
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The service manual when downloaded and printed out was clear and easy to read. I would have liked to have been able to enlarge some details, but this was not possible as the file permissions did not allow this. The service was very good. The time taken from placing my order to downloading the document was only a few minutes.
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The manual is useful for trouble shooting for an old instrument. It saved money,and let me enjoy DIY.
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Perfect source of information for replacing the HDD and performing general diagnostics.
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Perfect source of information for replacing the HDD and performing general diagnostics.
LC-20A2M
4. Getting Initialized 4-1. Connect pins (81) and (82) of IC2001 to GND. Turn on the power. 4-2. Select the model number (A2H). 4-3. Select the screen size (20 inches). 5. Adjustments 5-1. +B adjustment (+B ADJ. on page 1) 1) Receive the colour bar signal. 2) Adjust the voltage at pin (8) of P303 to 5.00 ±0.02 V. Note: The 5.00 V level is used as reference to the supply voltage. Make an exact adjustment to 5.00 V. 5-2. Counter bias adjustment ...... �COM BIAS� on page 2 1) Receive the monoscope pattern signal. 2) Adjust the �COM BIAS� setting so that the contrast at the staircase wave is maximum. 5-3. TAMP adjustment 1) Receive the colour bar signal. 2) See if the �Y� reading on page 2 of the adjustment process is somewhere between BB and CA. If not, make the �NTSC TAMP� adjustment to get the �Y� reading in the range of BB thru CA. 3) Then enter the above setting, if made in the �NTSC TAMP� adjustment, in the following items in the manual mode. �PAL TAMP�, �SECAM TAMP�, �PAL-M TAMP� and �PAL-N TAMP�.
(Adjustment process menu on-screen display on page 2)
0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Y data (75% white) 1 2 COM NTSC PAL PAL PAL TV SECAM -M H N B I AS 1 1 1 2 2 2 2 NG 7 9 7 7 7 7 4 0 0 0 R3 Y 0 0 0 0 0 0 0 0 0 0 B5 TAMP TAMP TAMP TAMP TAMP PEAK I 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
RCUTOFF GCUTOFF BCUTOFF G3 G1 B3 B4
5-4. White balance adjustment 1) Receive the monoscope pattern signal. 2) Adjust so that the �RCUTOFF� and �BCUTOFF� settings on page 2 of the adjustment process are optimum. Note: The �RCUTOFF� and �BCUTOFF� settings in the adjustment process should be in the range of -10 thru +10. If without this range, the variable user control range will be reduced.
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