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This can be due to many faults and need a full check up but I can fill up with few tips. 1. If the cassette loads and the take up spool does not turn then the machine will shut and rewind. 2. If the take up spool rotates but then it shuts down then the reel sensor at the bottom of the forward wheel can be faulty- there are opto devices or proximity sensors/magnetic type. 3. If the drum does not rotate it will shut down as well a fault in the SERVO section. 4. Defective HALL IC can shut the switching and so the servo will shut down the processor. 5. Fault in the power section to deliver the correct voltage to the circuits/loading servo to take up. 6. Finally if the loading is not to the MODE switch point or failure of mode can make the loading to trip as it will not complete the load to the desired point.
All the above issues can stall the loading of the tape and so will be seen as struck inside. Sometimes mechanically/manually removing by unwinding the motor can release a jamming and restore.
On this unit there is no manual tracking button - it's done automatically by a special circuit that uses the special signal from the tracks themselves. If the tracking is bad then the heads are dirty and they don't pick that special signal.
Clean them with a special cleaning tape. If you can't source one the unit will have to be dismantled and the 4 heads will have to be manually cleaned with a q-tip moist with alcohol.
Possible fault with the failure of the servo system, the mechanism , front loading and forward loading or the failure of the drum servo/capstan servo.
You can remove the front panel and top panel and remove up the loading mechanism by unscrewing the mounting. carefully disconnect the cylinder head strips, the audio connections and remove. manually turn to unload off the tape. then check for belt failure or visible errors. Now set back use a dummy cap to cover the end sensor emitter at the centre and manually push the loading mechanism assisting . If there is no loading the capstan is faulty, if it loads and the drums does not work it is tthe cylinder servo.
You will need some knowledge of the circuits to proceed to the correct fault.
Sony DCR-HC21 has a multi-AV in, your Hi-8 should have a mini (4 band) to multi AV out. The cable would look like a stereo headphone cable on one end with thre RDA type plugs on the other end; red, white, yellow. The mulit in on the DV would probabaly be the same type connector. Youd have to use a coupler set for the two multi-av cables to bridge video to video and audio to audio. Come out of the Hi8 into the miniDV recorder. You should not need a Dazzle unless you want to transfer to a PC for editing before moving video back to a miniDV tape.
This type of problem may be caused by a dirty video head, people some time try to adjust tracking to take care of this problem this is a mistake. Now to clear up this issue first you put the tracking control mid way in its setting, then you clean the heads of the VCR you can use a head cleaning tape (follow the instructions on the cleaning tape box)for this or if you have experience you use a chamois swab type cleaner (follow the instructions on the package of swabs and liquid cleaner). one the heads are cleaned you acn then try to adjust track to obtain the best picture. If you can not you may have video head problems or a problem in the drum motor (servo) mechanism. In which case I advise taking the unit to a TV repair shop.