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Pioneer DVR-RT400-S Service Manual
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DVR-RT400-S 835 6 7 85 6 7 8CDFABE2-2: CONFIRMATION AND ADJUSTMENT OFAUDIO/CONTROL HEADWhen the Tape Running Mechanism does not work well,adjust the following items.1. Playback the VHS Alignment Tape (GGV1222).(Refer to SERVICING FIXTURE AND TOOLS)2. Confirm that the reflected picture of stamp mark isappeared on the tape prior to P4 Post as shown inFig. 2-2-A.a) When the reflected picture is distorted, turn the screw1 clockwise until the distortion is disappeared.b) When the reflected picture is not distorted, turn thescrew 1 counterclockwise until little distortion isappeared, then adjust the a).3. Select the output audio from Stereo to Mono, using theAudio Select button of Remote.4. Turn the screw 2 to set the audio level to maximum.5. Confirm that the bottom of the Audio/ Control Head andthe bottom of the tape is shown in Fig. 2-2-C.c) When the height is not correct, turn the screw 3 toadjust the height. Then, adjust the 1~3 again.2-3: TAPE RUNNING ADJUSTMENT(X VALUE ADJUSTMENT)1. Confirm and adjust the height of the Reel Disk.(Refer to item 1-1)2. Confirm and adjust the position of the Tension Post.(Refer to item 1-2)3. Adjust the Guide Roller. (Refer to item 2-1)4. Confirm and adjust the Audio/Control Head.(Refer to item 2-2)5. Connect CH-1 of the oscilloscope to TP102, CH-2 toTP103 and CH-3 to HOT side of Audio Out Jack.6. Playback the VHS Alignment Tape (GGV1223).(Refer to SERVICING FIXTURE AND TOOLS)7. Press and hold the ATR button on the remote controlmore than 2 seconds to set tracking to center.8. Set the X Value adjustment driver (GGF1510) to the 4of Fig. 2-2-B. Adjust X value so that the envelopewaveform output becomes maximum. Check if therelation between Audio and Envelope waveformbecomes (1) or (2) of Fig. 2-3.9. Playback the VHS Alignment Tape (GGV1224).(Refer to SERVICING FIXTURE AND TOOLS)10. Check if the picture is played back correctly.2-4: CONFIRM HI-FI AUDIO (Hi-Fi model only)1. Connect CH-1 of the oscilloscope to TP102 and CH-2 tothe Hi-Fi Audio Out Jack.2. Playback the VHS Alignment Tape (GGV1222).(Refer to SERVICING FIXTURE AND TOOLS)3. Press and hold the ATR button on the remote controlmore than 2 seconds to set tracking to center.4. Press the Tracking Up button and count number of stepswhich the audio output is changed from Hi-Fi (10KHz) toMONO (6KHz).5. Press and hold the ATR button on the remote controlmore than 2 seconds to set tracking to center.6. Press the Tracking Down button and count number ofsteps which the audio output is changed from Hi-Fi(10KHz) to MONO (6KHz).7. If the difference are more than 3 steps, set the X Valueadjustment driver (GGF1510) to 4 of Fig. 2-2-B.Change the X Value and adjust it so that the valuebecomes within 2 steps.Audio/Control HeadAudio/Control HeadAudio/Control HeadTape0.25 ± 0.05 mmP4 CapStamp MarkReflected picture ofStamp MarkEnvelopeCH-3Audio(1)(2)Fig. 2-2-AFig. 2-3Fig. 2-2-BFig. 2-2-C1432 |
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