Quantcast Eject malfunctioning in JVC HR-S9600 - digitalFAQ Forum
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  #1  
07-31-2021, 05:28 AM
Tokyo_DIY Tokyo_DIY is offline
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I got a request from a neighbor to try and fix a Victor HR-VX200. This machine is the same as the JVC HR-S9600 (NTSC S-VHS dynamic drum system).
The machine, manufactured in 1999, is in beatiful condition, and it has a wonderful picture quality. However the response to some commands was a bit slow/uncertain. What I have done is simply cleaning the mode switch with a contact restorer liquid + cotton buds. I also added a small quantity of silicon grease to part of the gears (I have already done the same operations on another JVC HR-S9600 last year, so I think I know how to carry out the operation).
However, after reassembiling the deck this is the result:
- play/rewind and all other commands now operate readily
- however for some reason the deck now has a defect with the eject operation.
In detail: the deck loads tapes with no issue. Play, slow, rewind, etc are all flawless and with no disturbance. However when you eject the tape, for some tapes the deck starts the eject, but cannot complete the eject properly. You can see that the cassette is ejected, and if you want you can take it with your hand. However the motor does not stop: it is like it cannot correctly detect the completion of the eject operation.
After ejecting the tape, the loading motor should stop, but it continues spinning for a few seconds, and then if the user does not take the cassette manually, it re-loads the tape. If you take the cassette out of the deck, it will anyway try to do a load operation (even without a tape), and then stop halfway with the tape door half open like in the attached picture. At this point power shuts down automatically.
So it seems that for some reason the deck is unable to correctly detect the completion of the eject operation and stop the loading motor. Can anybody tell me what is wrong here?
Now, this problem does not happen for all the tapes, but only for about 50% (for the other 50% of the tapes operation is completely normal).


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  #2  
07-31-2021, 06:19 AM
Dougmc Dougmc is offline
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If it didn't have a issue before I would say timimg of the gears is off.
Recheck those you removed.
Is the load motor on the main deck or on the loading assembly?
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  #3  
07-31-2021, 06:32 AM
Tokyo_DIY Tokyo_DIY is offline
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Quote:
Originally Posted by Dougmc View Post
If it didn't have a issue before I would say timimg of the gears is off.
Recheck those you removed.
Is the load motor on the main deck or on the loading assembly?
I have removed only the mode switch, so I can re-check the timing of that.

The loading motor can be seen in the attached picture. I hope it is clear enough.


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  #4  
07-31-2021, 06:59 AM
Dougmc Dougmc is offline
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Best guess when the tape housing is going up one side is just little lower
And not fully in the slot to to move out.
.with the whole assembly or just removing power to the loading motor
Apply a low voltage from.power supply and watch it go slower.
No adjustable power supply ,use batteries.
A 9v battery may work.
Possible some lubricant is partly in the holes , slots that the led sensors

Use.
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  #5  
08-02-2021, 08:31 AM
Tokyo_DIY Tokyo_DIY is offline
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Quote:
Originally Posted by Dougmc View Post
If it didn't have a issue before I would say timimg of the gears is off.
Recheck those you removed.
Is the load motor on the main deck or on the loading assembly?
Many thanks for your help.
This issue seems to be solved.
It was actually the mode switch which needed a deeper cleaning. One sector of it was still oxidized. After this second pass of cleaning with contact restorer, everything seems to work fine (crossing my fingers...).
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  #6  
08-21-2021, 08:06 AM
Tokyo_DIY Tokyo_DIY is offline
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Quote:
Originally Posted by Dougmc View Post
ld say timimg of the gears is off.
Actually the same problem with eject not operating correctly and "reloading" the tape resurfaced on this machine a couple of days ago, and I am trying to help to fix it.
I have noticed that it happens only 50% of the times, and more than the mode switch, which is now clean, I think that the mechanism could be misaligned as you suggested.

Today I have opened the mechanism, looked at the alignment condition in very much detail, and found an issue.
The problem is that even with the service manual, it seems I am not able to fix it.
Let me try to explain.
I am looking at the JVC HR-S9800 service manual, and the section "2.2.13 Link Lever" explains that after setting the Mechanism Assembly Mode (control cam hole aligned with chassis hole), the mark E on the control plate must be aligned with the triangle mark on the loading arm gear shaft.
In this VCR the mark E and the triangle are not perfectly aligned and there is instead a misalignment of a few millimeters. I think that is causing the malfunction (on another VX200 I have the alignment is perfect within 1 millimeter and everything works ok).
The problem is that I do not know how to adjust this misalignment.
I have removed the control plate and then installed it again (section "2.2.15 Control Plate") to become more familiar with the mechanism, but now it is exactly as before.
In the attached photo, which shows the present situation, it is difficult to notice the misalignement, but actually the misalignemnt of 2-3 millimeters is there.
The link lever is not adjustable, and so after setting the Mechanism Assembly Mode I do not know how to adjust the position of the control plate, which seems to be controlled directly by the link lever.


I know this is a very detailed and peculiar question, but does anybody know if it is possible to correct this misalignment?
Kindly comment on this problem.


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  #7  
08-21-2021, 08:34 AM
Dougmc Dougmc is offline
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Is the tapes that work prerecorded ( less weight )
And tapes that didn't recordable , heavier?
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  #8  
08-21-2021, 08:41 AM
Tokyo_DIY Tokyo_DIY is offline
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Quote:
Originally Posted by Dougmc View Post
Is the tapes that work prerecorded ( less weight )
And tapes that didn't recordable , heavier?
This seems to happen randomly with all tapes.
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  #9  
08-21-2021, 09:27 PM
Dougmc Dougmc is offline
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In your 1st post you have the motor doesn't stop
When trying to eject.so is the belt slipping on the pulleys?
If so try smaller belt or maybe if that a issue getting
parts try pulling small rubber bands on each pulley then
Put the belt back on. To test it.
From your last post ,that lever where it drives the straight long nylon gear where
That anchor looking post is ,that comes up thru the metal lever gear, in that rectangle hole
Is it loose, like a lot of play or gap?
Ideally much easier when comparing to a known good deck.
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  #10  
08-22-2021, 08:17 AM
Tokyo_DIY Tokyo_DIY is offline
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>In your 1st post you have the motor doesn't stop When trying to eject.so is the belt slipping on the pulleys?

During the normal phase of the eject operation, until the cassette is completely ejected, everything seems to operate normally. The belt is not slipping.
However when the normal eject operation is completed and the abnormal phase starts, (assuming you grab the cassette with your hand) you can see that the cassette loading mechanism starts moving towards the inside of the deck. However the catches stop the loading mechanism because the tape is not there. The motor continues spinning for a couple of seconds,and during this part the belt is slipping on the pulley until the deck automatically powers down for protection.


> If so try smaller belt

The belt is the original one, and looks in very good condition. It is not slipping unless something blocks the mechanism.

> From your last post ,that lever where it drives the straight long nylon gear where That anchor looking post is ,that comes up thru the metal lever gear, in that rectangle hole
Is it loose, like a lot of play or gap?

There is no play at all. If you touch the mechanism it looks completely normal. No part is loose. The only difference is, as mentioned, that the straight nylon gear (this is called "control plate" by JVC) is not exactly in its correct position when the control cam is in the Mechanism Assembly Mode.

When I compared the mechasmi with the good VX200 the only difference I could spot is the control plate shifted horizontally by a couple of millimeters (and correspondingly the mode switch is not exactly in the position of alignment, but rotated by 5 - 10 deg.
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  #11  
08-23-2021, 11:41 AM
Dougmc Dougmc is offline
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When I compared the mechasmi with the good VX200 the only difference I could spot is the control plate shifted horizontally by a couple of millimeters (and correspondingly the mode switch is not exactly in the position of alignment, but rotated by 5 - 10 deg.



So the good deck the mode switch is not align when the cam is aligned in the hole?
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  #12  
08-23-2021, 04:11 PM
Tokyo_DIY Tokyo_DIY is offline
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Quote:
Originally Posted by Dougmc View Post
When I compared the mechasmi with the good VX200 the only difference I could spot is the control plate shifted horizontally by a couple of millimeters (and correspondingly the mode switch is not exactly in the position of alignment, but rotated by 5 - 10 deg.



So the good deck the mode switch is not align when the cam is aligned in the hole?
The situation is like this:

bad deck:
control cam in Mechanism Assembly Mode,
control plate misaligned by 2 mm
switch mode misaligned by 10 deg

good deck:
control cam in Mechanism Assembly Mode,
control plate aligned
switch mode aligned

The photo attached here is of the good deck. You can see that what you call the little anchor which is coming out of the rectangular hole in the metal link lever looks higher than in the bad deck. The problem is that I do not know how to adjust this situation. The link lever position looks not easily adjustable to me.

If what I write is not clear, please tell me.


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File Type: jpg IMG_8807.jpg (116.3 KB, 5 downloads)
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  #13  
08-23-2021, 05:05 PM
Dougmc Dougmc is offline
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The last 2 pictures are both decks in full eject position?
Hard to compare if both are not in the same position.
You may not see any play if the spring to the far right of the control plate puts pressure on it.
Did you spray clean the mode switch or take it apart?
What year is that vcr? Or if any one knows what years did the mske that
Mechanism?
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  #14  
08-23-2021, 05:27 PM
Dougmc Dougmc is offline
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To eliminate the mode switch completely just switch them.
Sorry if I missed any info reading thru my phone.
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  #15  
08-24-2021, 05:35 AM
Tokyo_DIY Tokyo_DIY is offline
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Quote:
Originally Posted by Dougmc View Post
The last 2 pictures are both decks in full eject position?
Hard to compare if both are not in the same position.
Independently on being in Mechanism Assembly Mode (i. e. full eject position) or not, I can always see the same difference all the time. The small anchor is in a different position for this deck. Please look at the following pictures:

1) good_deck_a.jpg is the first VX200 which works OK (close-up).
2) yet one more VX200 close-up which does not have the issue is good_deck_b.jpg
3) the deck presenting the issue looks like IMG_9269bad_vcr.jpg: you can see that the position of the little anchor is different from the good decks. Only in the bad deck it comes to the center of the square hole.
4) the deck presenting the issue from a different angle: IMG_8766bad_vcr.jpg
5) in 8768 you can see that when the control cam is in Mechanism Assembly Mode the control plate is not aligned with the "E" but is a couple of millimeters away.

This deck was manufactured in '99 (and the good ones as well).
I have already exchanged the mode switch with another one and nothing changed.


Attached Images
File Type: jpg good_deck_a.jpg (63.4 KB, 4 downloads)
File Type: jpg good_deck_b.jpg (61.5 KB, 3 downloads)
File Type: jpg IMG_9269bad_vcr.jpg (84.9 KB, 4 downloads)
File Type: jpg IMG_8766bad_vcr.jpg (66.2 KB, 3 downloads)
File Type: jpg IMG_8768bad_vcr.jpg (59.2 KB, 4 downloads)

Last edited by Tokyo_DIY; 08-24-2021 at 05:45 AM.
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  #16  
08-24-2021, 09:34 AM
Dougmc Dougmc is offline
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So looking at the previous pictures the metal arm
From the cam gear to the control plate are not in the place.
Maybe something wrong with the groove where the
Guide pin on the metal arm rides in..worn out,broke,crack expanding
When pressure applied.
I see the good one has a different looking material
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  #17  
08-24-2021, 10:02 AM
Tokyo_DIY Tokyo_DIY is offline
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Quote:
Originally Posted by Dougmc View Post
So looking at the previous pictures the metal arm
From the cam gear to the control plate are not in the place.
Maybe something wrong with the groove where the
Guide pin on the metal arm rides in..worn out,broke,crack expanding
When pressure applied.
I see the good one has a different looking material
Thank you for the comment.
I will tear down both mechanisms again in the following days and compare the status of the control gear (i.e. cam gear). I have a spare control gear from a trash deck, so if the issue is the gear I should be able to change it.
I will provide updates.
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  #18  
08-30-2021, 08:06 AM
Tokyo_DIY Tokyo_DIY is offline
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Hello,
this movie shows in detail what happens inside this JVC when the eject malfunctions.

I have checked the control cam and it is not broken nor damaged. Even substituted it, but nothing changed.


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File Type: mov IMG_9403.MOV (45.74 MB, 9 downloads)
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  #19  
08-30-2021, 08:18 PM
thestarswitcher thestarswitcher is offline
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On a completely crazy coincidence..... I'm having the exact same problem that started literally today with my European HR-S9660EU. I'll be following this thread.

Even though tapes/capture is perfectly fine, this is a very big inconvenience..
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  #20  
08-30-2021, 08:59 PM
Tokyo_DIY Tokyo_DIY is offline
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For reference, this movie shows the vcr operation in those sporadic cases when the eject happens regularly. Maybe it can be useful for comparison with the previous file 9403.


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File Type: mov IMG_9402.MOV (29.33 MB, 4 downloads)
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