Hitachi DV-RV8500E, Service Manual

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Adjustment / Maintenance > Deck Mechanism Adjustment
5-3-5 Check after adjustment
(1) FM output check when switching from VCR search to playback
Press the playback button during VCR search, and make sure that the appropriate amplitudes of
FM envelope and audio outputs can be obtained within the specified time.
1) Connect oscilloscope CH-1 to the FM ENV terminal on VCR P.C.B, and CH-2 to the audio output
terminal.
2) Play back the alignment tape.
3) Observe the waveforms on oscilloscope: Measure the times until the appropriate amplitudes are
obtained when the playback button is pressed during reverse search.
Specifications: FM envelope within 5 seconds; audio output within 10 seconds
4) Press the playback button during forward search, and measure the times in the same way.
5) If the specifications are not satisfied, perform the following adjustments again:
A/C head adjustment
X-value adjustment
(2) Tape curling/wrinkling check
1) Run an E-240 tape, and make sure that no curling or wrinkling occurs at the start, middle or end
of tape.
2) If curling or wrinkling occurs, perform the following adjustments again:
Guide roller height adjustment
A/C head adjustment
5-3-6 Method of setting the mechanism to loading status without inserting tape
1) Unplug the power cord from AC outlet.
2) Remove the top cover and front panel.
3) Use black masking tape, etc. to shield light from the end sensors on both sides.
4) Plug the power cord into AC outlet to power the recorder.
5) While pressing the stop lever of CST holder assembly, load the CST holder assembly (it will
automatically load midway).
6) When the CST holder assembly descends to chassis, the cylinder will rotate, and the P2/P3 base
assemblies will operate in the loading status to go to stand by.
This status will allow you to input each mode. However, when rewind is performed, the power will
turn off in a few seconds, since the take-up reel is in the stop status and no reel pulse can be
detected.
Therefore, for rewind operation, manually rotate the take-up reel.