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This is the original manufacturers service manual, with detailed info on the circit boards, explosion drawings of all parts in assembly order, and tuning instructions. The only thing missing is the information on the dimensions of the various drive belts. mail me if you need them. gcrossman_at_aol.com
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Ordered service manuel for a hard to find plasma tv - your company made it easy to find and purchase - I will use you again
Thanks for your help
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This is a high quality manual with clear schematic and components layout diagrams ; with service procedure included.
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This service manual for the Kenwood KT-990D was reproduced really well ,is very legible and manual is complete.Combined with the low price paid,in the future,I will be checking Owner-Manuals.com any time I need a manual.
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When I purchased this manual I had my doubts regarding the quality as the price was so reasonable as compared to other outlets.
The manual itself is of high standard the print is very clear as are the diagrams. Obviously with the diagrams one has to zoom in otherwise it is to small to be able to read.
Overall I am very pleased with the company who delivered as they said and with the manual they supplied.
I occasionally require a manual and now having registered with this company I shall order from them in the future.
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Symptoms in case of poor adjustment: Error efficiency deteriorated: 10 -3 (Optimum value: 10-4 or lower) High jitter of the RF signal RF waveform deformed Unstable operation in tracking closing and servo control Caution: Avoid exposing your eyes to laser beams for a long time. Preparation for adjustment: Clean both ends of the shafts. Use brand new skew screws supplied with the service kit GXX1259. Procedures: 1. Place the DVD mechanism module upside down. To avoid the disc from being robbed when it is turned upside down, first put a coin of about 1.5 mm on the table, then turn the disc upside down and set it so that the 1 in the figure comes to the point immediately above the coin. 2. After replacing the pickup (by referring to the procedures of "Removing the Pickup."), roughly adjust the three skew screws through visual check so that the pickup is mounted in parallel to the CRG chassis around the inner and outer tacks. 3. Connect an oscilloscope as shown in the connecting diagram. 4. Turn on the power of the product. Load the test disc (GGV1018). 5. In the front-end test mode, set the disc type to DVD layer 1. Then, turn on the power. Move the pickup toward the inner tracks. 6. Turn on the laser diodes. 7. With the focus servo closed, complete all automatic adjustments. Close the tracking servo, and then complete all automatic adjustments. 8 Follow the next procedures, from 8-1 to 8-5, and adjust the (three) skew screws. 8-1 Move the pickup toward the inner track and turn the skew adjustment screw C so that the RF level of oscilloscope becomes the maximum. (Tangential adjustment at the inner track position: Adjust the flatness of the disc at the inner track position with the adjustment screw C) 8-2 Move the pickup toward the outer track and turn the skew adjustment screw B so that the RF level becomes the maximum. (Tangential adjustment at the outer track position: Adjust the flatness of the disc at the outer track position with the adjustment screw B) 8-3 Leave the pickup at the outer track position and turn the skew adjustment screws A and B in the same direction alternately one quarter at a time (A�B�A�B ���) so that the RF level becomes the maximum. (Radial adjustment at the outer track position: Keeping the flatness at the outer track position, adjust the flatness of the whole disk with the adjustment screws A and B) 8-4 Move the pickup toward the inner track and turn the skew adjustment screw C so that the RF level becomes the maximum. (Tangential adjustment at the inner track position: Adjust the flatness of the disc at the inner track position with the djustment screw C) 8-5 Repeat the steps from 8-2 to 8-4 three times, and adjust at the position where the RF level becomes the maximum. 9. Turn off the power in the test mode. After confirming that the disc has stopped, eject the disc. 10. Adjust with a screw rock the shaft and skew adjustment screw to the same state as initial one. Skew adj. screw Apply glue Skew adj. screw
A
B
C
D
Prevent applied glue Shaft from extending beyond this position.
Prevent applied glue from extending beyond this position.
E
C 1 B
A
F
AVIC-Z1/UC
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