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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.
Service Hints
4. MEASURE THE LASER CURRENT
CD DRIVE � LASER CURRENT MEASUREMENT
The laser current can be measured as a voltage drop on resistor 3820. Typical value 170 - 190mV for CD-DA respectively 200 - 220mV for CD-RW.
3818 47n 47R
10-3
6. MEASURE THE OFFSETS OF THE CD10
SIGNAL PROCESSOR � OFFSET MEASUREMENT
Each ADC input of the CD10 may have an offset too. Also this offset leads (together with the offsets of the CD Drive) to poor playability of some CDs (skipping tracks). Start the Service Test Program - section �Focus Test� using a CD-RW disc. Use a DC Millivoltmeter for measurement. The offsets can be measured on capacitors near the signal processor. See drawing below.
Laser power control
2876 U >250mV ->Laser damaged !
1R 47u
3820 2878 +5V 100n 4R7 3822
+5V_HF 470n 3821 2877
2841
3817
3819
47R
100n
The value should read 0mV±10mV.
4,6V 3 0,17V
3,9V 3,3V 7879 BC807-40 47R
10K 7811-A 8 LM358D 3823 1 1K 3V 4
CD Board side A view
2 2879 2880
LASER DIODE
2V 2869
0,17V 1n 33p
5. MEASURE THE OFFSETS OF THE CD-DRIVE
CD DRIVE � OFFSET MEASUREMENT
Each photodiode of the CD-drive may have an offset. This offset has to be compensated by the signal processor. A high offset of the CD-drive leads to poor playability of some CDs (skipping tracks). Start the Service Test Program - section �Focus Test� without a CD. Focus sensitivity = CD-RW. Use a DC Millivoltmeter for measurement. The offsets can be measured direct on the connector. See drawing below.
B VREF A C D F E
Signal Processor
The values from diode A-D should read 0±10mV. Diodes E and F are less critical.
3
4
5
CD Drive Sanyo DA12T3
VREF VCC E
E B C D F A
If one of the offsets is higher than ±10mV the signal processor has to be replaced.
1800
16 VrefCD10 15 14 13 12 11 10 9 8
E D A B C F
If none of the measured offsets is higher than ±10mV replace the part with the higher value.
+5V_HF E D A B C F
D A B C F GND
If one of the offsets is higher than ±10mV the CD drive has to be replaced.
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