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The AKAI 1720 model reel to reel tape recorder described in this Manual is quite an old unit - circa late 1960's. As a consequence, the description of the mechanical details - and adjustments thereof - is quite critical. The manual does this quite well. The schematics are also well presented and have detailed PCB overlays. Probably the only negative is that some half-tone detail has been lost from the original manual as it has been scanned in simple B&W.
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Perfect source for service manuals: fast and professional transaction; high quality, perfect readable and largely scaleable PDF; complete schemes, diagrams and spare part list. Tnx a lot, cu again!!!!
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I got your link from a friend and I must say that I am really satisfied with your service. Specially this B&O manual I didn't find anywhere on the web... but you could deliver it :-) . You deliver very fast and the copy is of good quality. So your webpage is bookmarked. Thanks
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This was the Sony CCU-500A Service manual I was looking for.
The price was reasonable.
The permission to download was quck.
I will use Owner-Manual.com for all my manual needs.
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Excellent printing quality.
A complete and very usefull service manual with all details.
GREAT SERVICE AT VERY LOW PRICE!
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ELECTRICAL ADJUSTMENTS
2-4: WHITE BALANCE NOTE: Adjust after performing CUT OFF adjustment. 1. Place the set with Aging Test for more than 15 minutes. 2. Receive the white 100% signal from the Pattern Generator. 3. Using the adjustment control, set the brightness and contrast to normal position. 4. Activate the adjustment mode display of Fig. 1-1 and press the channel button (01) on the remote control to select "RCUT". 5. Using the RIGHT/LEFT button on the remote control, adjust the RCUT. 6. Press the CH. UP/DOWN button on the remote control to select the "GDRV", "BDRV", "GCUT" or "BCUT". 7. Using the RIGHT/LEFT button on the remote control, adjust the GDRV, BDRV, GCUT or BCUT. 8. Perform the above adjustments 6 and 7 until the white color is looked like a white. 2-5: FOCUS 1. Receive the monoscope pattern. 2. Turn the Focus Volume fully counterclockwise once. 3. Adjust the Focus Volume until picture is distinct. 2-6: HORIZONTAL POSITION 1. Receive the center cross signal from the Pattern Generator. 2. Using the remote control, set the brightness and contrast to normal position. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (19) on the remote control to select "HPOSI". 4. Press the RIGHT/LEFT button on the remote control until the right and left screen size of the vertical line becomes the same. 2-7: HORIZONTAL SIZE NOTE: Adjust after performing adjustments in section 2-6. 1. Receive the monoscope pattern. 2. Using the remote control, set the brightness and contrast to normal position. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (26) on the remote control to select "WIDS". 4. Press the RIGHT/LEFT button on the remote control until the SHIFT quantity of the OVER SCAN on right and left becomes 10 ± 2%. 2-8: VERTICAL LINEALITY NOTE: Adjust after performing adjustments in section 2-7. 1. Receive the center cross signal from the Pattern Generator. 2. Using the remote control, set the brightness and contrast to normal position. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (22) on the remote control to select "VLIN". 4. Press the RIGHT/LEFT button on the remote control until the upside and downside screen size of the horizontal line becomes the same. 2-9: VERTICAL SHIFT NOTE: Adjust after performing adjustments in section 2-8. 1. Receive the center cross signal from the Pattern Generator. 2. Using the remote control, set the brightness and contrast to normal position. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (20) on the remote control to select "VPOSI". 4. Press the RIGHT/LEFT button on the remote control until the horizontal line becomes fit to the notch of the shadow mask. 2-10: VERTICAL SIZE NOTE: Adjust after performing adjustments in section 2-9. 1. Receive the crosshatch signal from the Pattern Generator. 2. Using the remote control, set the brightness and contrast to normal position. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (21) on the remote control to select "VSIZE". 4. Press the RIGHT/LEFT button on the remote control until the rectangle on the center of the screen becomes square. 5. Receive a broadcast and check if the picture is normal. 2-11: PARABOLA CORR 1. Receive the rainbow pattern from the Pattern Generator. 2. Using the remote control, set the brightness and contrast to normal position. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (24) on the remote control to select "DPCS". 4. Press the RIGHT/LEFT button on the remote control until the right and left vertical lines are straight. 2-12: TRAPEZIUM 1. Receive the rainbow pattern from the Pattern Generator. 2. Using the remote control, set the brightness and contrast to normal position. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (25) on the remote control to select "KEYS". 4. Press the RIGHT/LEFT button on the remote control until the both vertical lines of the screen become parallel. 2-13: CORNER CORR TOP 1. Receive the rainbow pattern from the Pattern Generator. 2. Using the remote control, set the brightness and contrast to normal position. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (31) on the remote control to select "CNRT". 4. Press the RIGHT/LEFT button on the remote control until the upper section of the both ends vertical lines are straight.
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