Sharp VL-A111UL Service Manual - Page 29

VL-A111U/AH131U VL-AH151U/AH161U 6-6-3-2. Head Switching Point Adjustment 1) Play back the alignment tape (JiGWR5-5NSP) 2) Press the "CONTINUE" key and "TEST SEL." key on the Measuring instrument adjustment remote control to set the test mode. (At this time the numeral of "T-01" blinks.) 3) Using the "FF" and "REW" keys, select "T-08", and press "PLAY" key to set the SW-P adjustment mode. Mode Adjustment address Tape 4) When the adjustment is completed, "HSWP" is displayed and the tape is ejected. When the adjustment is not proper, "NG" is displayed in the red frame of the LCD. Oscilloscope Playback 30h Alignment tape (JiGWR5-5NSP) Only when the satisfactory result was not obtained by the adjusting method described above, perform the following adjustment. 1) Connect each signal to the oscilloscope. 1ch: SEP Y OUT ...... TL1453 2ch: H-SW-P TL7417 GND: GND TL1454 2) Play back the alignment tape (JiGWR5-5NSP) 3) Press the "CONTINUE" key and "VTR ADJ" key on the adjustment remote control to set the VCR adjustment mode. 4) Select the address 30h, set the sync slope of oscilloscope to (-), and adjust the data with "REW" and "FF" so that the interval between the trigger point and the V sync signal is set to 6H, and 6H 3H 3H 6H 3H 3H fix the data with the "PLAY" button. (See Figure 6.1.1.) 5) Then, set the sync slope to (+), and ascertain that the interval between the trigger point and the V sync signal has been set to 6H. V sync signal V sync signal (See Figure 6.1.2.) 6) Keep the STOP key pressed for about 3 seconds to exit from the adjustment mode. Figure 6.1.1 Figure 6.1.2 6-6-3-3. Y/C recording current adjustment 1. Y recording current adjustment · Hi-8model (AH131U/AH151U/AH161U) VTR ADJ REC Y current adjustment (Hi-8) REC Y current adjustment (Nor 8) Mode VCR STOP Address 3F 40 41 42 Measuring point TL9413(Sig) TL9414(Gnd) Adjustment standard ME 130±5mVP-P MP 95±5mVP-P ME 125±5mVP-P MP 120±5mVP-P Measuring instrument Oscilloscope · Nor8model (VL-A111U) VTR ADJ Mode Address Measuring point Adjustment standard Measuring instrument REC Y current VCR adjustment (Nor 8) STOP 42 TL9413(Sig) TL9414(Gnd) MP 120±5mVP-P Oscilloscope (1) Enter the VCR STOP mode. (2) Select the above applicable address with the adjustment remote control. (3) Measurement signal is output to TL9413. (4) Adjust the amplitude so as to get the adjustment standard value at TL9413(Sig) and TL9414(Gnd). Standard value 2. C recording current adjustment · Hi-8model (AH131U/AH151U/AH161U) VTR ADJ REC C current adjustment (Hi-8) REC C current adjustment (Nor 8) Mode VCR STOP Address 43 44 45 46 Measuring point TL9413 (Sig) TL9414 (Gnd) Adjustment standard ME 115±5mVP-P MP 105±5mVP-P ME 135±5mVP-P MP 120±5mVP-P Measuring instrument Oscilloscope · Nor8model (VL-A111U) VTR ADJ Mode REC C current VCR adjustment (Nor 8) STOP Address 46 Measuring point TL9413 (Sig) TL9414 (Gnd) Adjustment standard MP 120±5mVP-P Measuring instrument Oscilloscope (1) Enter the VCR STOP mode. (2) Select the above applicable address with the adjustment remote control. (3) Measurement signal is output to TL9413. Standard value (4) Adjust the amplitude so as to get the adjustment standard value at TL9413(Sig) and TL9414(Gnd). 29