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The ease of this purchase was a good start. The content of this manual was exactly all I needed to retore my Tandberg 64.
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I found this manual to be complete in every detail. Besides the schematic it has a complete set of alignment instructions which are easy to understand. It also includes a complete parts list as well as an explanation of how the power supply and safety shutdown circuits operate. Even a schematic of the tuner is included.
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BA-9628
5. Video Modulation Adjustment (NORMAL CH, ZENITH DSCR CH)
1. 2. 3. 4. Set S3 to position 2. Follow the same procedure as in �4, 1.� Follow the same procedure as in �4, 2.� Adjust the vertical scall of the oscilloscope 2 so that the synctip to the white level of the EIA color bar signal spans 7 vertical graticules, as shown in Fig. 5. 5. Follow the same procedure as in �4, 4.� 6. Set S1 to position 2. 7. Follow the same procedure as in �4, 6.� 8. Adjust VR204 so that the sync-tip to the white level spans 6.5±0.1 graticules on the oscilloscope 2. 9. Set the S1 switch to 6, and input the video signal to the CABLE IN terminal. 10.Set the ZENITH encoder and EGSS encoder (remodeled for ZENITH) to the scrambled state. 11.Adjust VR1401 of ZENITH DSCR ASSY so that the sync-tip to the white level spans 6.5 ± 0.1 graticules on the oscilloscope 2.
6.3 DPS SECTION (DPS ASSY) (Fig. 4)
1. DPS Video Output Level Adjustment
1. Set S3 to position 2. 2. Disconnect the monitor TV from the CATV converter. 3. Apply +5dBmV Fv and �10dBmV Fa DPS scrambled signal directly to the monitor TV. 4. Adjust the vertial scall of the oscilloscope 2 so that the synctip to the white level of the EIA color bar signal spans 7 vertical graticules, as shown in Fig. 5. 5. Re-connect the monitor TV to the CATV converter. 6. Set S1 to position 5. 7. Apply +5dBmV Fv and �10dBmV Fa DPS scrambled signal to the CABLE IN terminal. 8. Adjust VR801 so that the sync-tip to the white level spans 6.5±0.1 graticules on the oscilloscope 2.
6.4 RECONFIRMATION
1. Reconfirm AFT Adjustment
1. Set S1 and S2 to position 2 and apply a +5dBmV Fv carrier signal to the CABLE IN terminal. 2. Reconfirm the TP3 frequency to be 45.75MHz±10kHz.
7 Graticules
Fig. 5 Video Output Waveform (�I, Q, W, B section)
Fig. 6 Adjusting points
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