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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.
Record/Playback Head Azimuth Adjustment Procedure: 1. Mode : REV playback
Test tape P-4-A100 (10 kHz, �10 dB)
   
Tape Speed Adjustment Procedure: Mode: FWD playback
test tape WS-48B (3 kHz, 0 dB) 47 k � frequency counter
level meter 47 k � set

+ �
set LINE OUT
+ �
LINE OUT
  
2. Turn the adjustment screw for the maximum output levels. If these levels do not match, turn the adjustment screw until both of output levels match together within 1 dB.
  
1. Set to FWD playback mode. 2. Adjust RV801 so that the frequency counter reading becomes 2,980 ± 30 Hz. 3. Confirm that the deviation between tape top and tape end is within 3%. Playback Level Adjustment Procedure: Mode: FWD playback
test tape P-4-L300 (315 Hz, 0 dB) 47 k � set
L-CH peak output level R-CH peak
within 1dB within 1dB
level meter + � LINE OUT
Screw position
angle L-CH peak R-CH peak
3. Phase Check Mode : playback
test tape P-4-A100 (10 kHz, �10 dB) L-CH set 47 k � 47 k �
V + � + � H
Adjust RV151 (L-CH) and RV251 (R-CH) so that the reading on level meter meets the adjustment limits below.
oscilloscope
Adjustment Limits: LINE OUT level: �4.7±0.5 dB (0.43 to 0.48 V) Level difference between channels: within 2 dB Check that the LINE OUT level does not change even if Playback and Stop operation is repeated several times. Adjustment Location: DECK board
R-CH LINE OUT Screen pattern
Adjustment Location: [DECK BOARD] (Component side)
in phase 45° Good
90°
135° 180° Wrong
RV152 Record BIAS(L-CH) RV252 Record BIAS(R-CH)
RV151 Playback Level(L-CH)
4. Set in the FWD mode and repeat the step 1 to 3. 5. After the adjustment, lock the screw with locking compound. Adjustment Location: Record/Playback head
RV251 Playback Level(R-CH)
T351
IC305 CN352
FWD side
 
REV side
 
Adjustment screw
�5�
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