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This service manual was determinant to enable to fix my Alpine Amplifier. I am pleased with my purchase. For a 5 star rating I would like to see a higher resolution scan of the printed circuit board lay-out because the gray scale grafics was dificult to see. Also some schematic diagrams were scanned at a slight angle. Never the less, it had all information I needed to troubleshoot and service my equipment.
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Complete manual, the good quality of reproduction allows enlarged print-out of the schematic diagram in the size it probably had in the original print edition and which is necessary for practical use.
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The service manual was complete and the components on the drawings very good visible.
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downloaded next day , manual is very helpful , fast and easy
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This Service Manual was exactly what I needed to repair my Philips TV. The purchase was convenient and I received the manual at the same day I paid for it.
3-4. Phase Adjustment
1. Play back an alignment tape (NM3KE6 : 859C339O50). 2. Preset the tracking. 3. Loosen the Screws D and E shown in the Fig. 3-4-1. Insert a screw driver (+) into the Hole in the MAIN PLATE ASSY (Part A) and move the A/C PLATE to the right and left to set the amplitude level of the FM Waveform to maximum. 4. Tighten the Screws D and E. 5. Play back an alignment tape [NMX : 859C568O60]. 6. Confirm the Missing Portions of the FM Waveform and Audio Waveform are as shown in the Fig. 3-4-2. 7. If the Missing Portions differ from the Fig. 3-4-2, repeat the procedure 3. 8. Adjust the tracking so that the amplitude level of the FM Waveform will be at the maximum. And set the oscilloscope so that the Waveform will be 5 divisions of the oscilloscope. 9. Preset the tracking. 10. Confirm that the FM Waveform on the oscilloscope is 4.8 divisions or more. 11. If the FM Waveform is below 4.8 divisions, preset the tracking and repeat steps 3~10. 12. Push the A/C HEAD to the right and left (in the direction of A-A' in the Fig. 3-4-1) and release it. Confirm that the amplitude of the FM Waveform does not change, compared to before the A/C HEAD was shifted. 13. If the amplitude level of the FM Waveform changes, check the set position of the A/C HEAD. If the A/C HEAD is installed incorrectly, correct the position according to the Item 2-8. "A/C HEAD UNIT" and 3-3. "A/C HEAD Adjustment", and then repeat this item from the beginning. 14. Alternately load and unload the tape several times. Confirm that the amplitude of the FM Waveform does not change.
Screw D
A
Tape
Part A
a A'
Screw E
Fig. 3-4-1
FM Waveform
Audio Waveform Output
b
Missing Portion
Fig. 3-4-2
3-5. Tape wrinkle check
1. Confirm that there is no wrinkle at the lower edge of GUIDE POLE(TU) in PB/FS mode with T-160 tape beginning and ending. 2. Confirm that there is no wrinkle at the upper edge of GUIDE POLE(TU) in RS mode with T-160 tape beginning and ending.
Tape
GUIDE POLE (TU)
GUIDE PIN (TU)
Fig. 3-5
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