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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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I was at first dubious about payiong for downloaded manuals but having done so, I was extremely impressed with quality of the two manual I ordered, well worth the small price I paid.
I would highly recommend these to my friends.
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reasonable price for the schematic - the service is perfect, all as expected and pointed by instructions - good scan of the original plans - thank you!
2. AUDIO CONTROL HEAD TILT ADJUSTMENT
Purpose: To confirm that the tape runs smoothly. In particular, confirm that the tape properly picks up the Audio Signal at the upper part of the head and the Control Signal at the lower part of the head. Symptom of Misadjustment: If the tilt of the Audio Control Head is poorly adjusted, the tape will eventually be damaged. An intermittent Blue screen may be seen in Playback. 1. Play back a T120 cassette tape and check that the tape travels smoothly between the upper and lower guides of the P4 post. 2. If necessary, adjust Black Screw (B) clockwise until the tape begins to curl at the lower edge of the P4 post. Then adjust the screw counterclockwise until the curling is eliminated.
Tape Running Condition Audio Control Head in Tilted Condition Direction to turn for Correction
Black Screw (B) Black Screw (C)
Black Screw (A) Control Head Lower Edge of Tape 0.25mm
Lower Edge of Control Head Fig. M8
4. AUDIO CONTROL HEAD AZIMUTH ADJUSTMENT
Purpose: To adjust the position and height of the Audio Control Head so that it meets the tape tracks properly. Fig. M7 Symptom of Misadjustment: If the position of the Audio Control Head is not properly adjusted, the Audio S/N Ratio is poor. 1. Connect the oscilloscope to the TP4002 on the Main C.B.A. 2. Play back the 6kHz Monaural Audio portion of the alignment tape. 3. Adjust Black Screw (C) on the Audio Control Head base so that the output level is at maximum.
3. AUDIO CONTROL HEAD HEIGHT ADJUSTMENT
The height of the Audio Control Head replacement part is preset at the factory. Purpose: To be sure the tape runs properly along the Control Head. Symptom of Misadjustment: If the control signal is not properly picked up, Servo Operation cannot be achieved. A Blue screen will be seen in Playback. This confirmation is required when the Audio Control Head is replaced.
6KHz-Audio
Maximum
Fig. M9 1. Play back a T120 cassette tape and check that the lower edge of the tape runs approximately 0.25 mm above the lower edge of the Audio Control Head. 2. If necessary, adjust Black Screws (A) and (B) clockwise to lower the tape or counterclockwise to raise. 4. Confirm the height of the Audio Control Head is proper. If not, readjust Black Screws (A) and (B).
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