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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.
CD SECTION NOTE :
1. CD Block basically constructed to operate without adjustment. Therefore, check each item in order given. 2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated. 3. Use the oscilloscope with more than 10M� impedance. 4. Clean an object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks. Focus Bias Adjustment This adjustment is to be done when the optical block is replaced.
2. Connect between test point TP (FOK) and GND by lead wire. 3. Turned Power switch on. 4. Put disc (YEDS-18) in and turned Power switch on again and actuate the focus search. (actuate the focus search when disc table is moving in and out.) 5. Check the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 2.4 ± 0.7Vp-p.
S-curve waveform symmetry
A
Adjustment procedure :
oscilloscope (DC range) BD (CD) board TP (RF) TP (VC)
+ �
within 2.4 ± 0.7Vp-p B
1. Connect oscilloscope to test point TP (VC) and TP (RF) on BD (CD) board. 2. Connect TP ADJ (IC301 @� pin) to ground with lead wire on Main board. 3. Turned power switch ON. (Stop mode) 4. Put disc (YEDS-18) in and press the ^ button. 5. Press the ^ button (Tracking servo ON). 6. Adjust RV101 so that the oscilloscope waveform is as shown in the figure below (eye pattern). A good eye pattern means that the diamond shape ( ) in the center of the waveform can be clearly distinguished. 7. After adjustment,remove the lead wire connected in step 2.
r
6. After check, remove the lead wire connected in step 2. Note : r Try to measure several times to make sure that the ratio of A : B or B : A is more than 10 : 7. r Take sweep time as long as possible and light up the bright ness to obtain best waveform. Adjustment Location : BD (CD) board. (see page 13) RF Level Check
oscilloscope BD (CD) board TP (RF) TP (VC)
+ �
RF signal reference waveform (eye pattern)
VOLT/DIV : 0.2V TIME/DIV : 500ns
Procedure : 1. Connect oscilloscope to test point TP (VC) and TP (RF) on BD (CD) board. 2. Turned Power switch on. 3. Put disc (YEDS-18) in and press the ^ button. 4. Confirm that oscilloscope waveform is clear and check RF signal level is correct or not. Note : Clear RF signal waveform means that the shape ��� can be clearly distinguished at the center of the waveform.
r
1.3 ± 0.3Vp-p
RF signal waveform
VOLT/DIV : 200mV TIME/DIV : 500ns level : 1.3 ± 0.3Vp-p
When observing the eye pattern, set the oscilloscope for AC range and raise vertical sensitivity. Adjustment Location : BD (CD) board. (see page 13) S-Curve Check
oscilloscope BD (CD) board TP (FEO) TP (VC)
+ �
Adjustment Location : BD (CD) board. (see page 13)
Procedure : 1. Connect oscilloscope to test point TP (VC) and TP (FEO) on BD (CD) board.
� 20 �
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