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Forum: Video Hardware Repair 09-15-2022, 03:52 PM
Replies: 3
Views: 292
Posted By latreche34
Open the front face and inspect the PCB for...

Open the front face and inspect the PCB for corrosion or damage, check all ribbon cables make sure they are clean, undamaged and fully seated.
Forum: Video Hardware Repair 11-18-2020, 02:32 PM
Replies: 10
Views: 1,099
Posted By latreche34
If there is pins then that's their purpose,...

If there is pins then that's their purpose, Alignment pins are of a very precise tolerance when machined/molded and should give a perfect position, At this point the OP must have screwed something up...
Forum: Video Hardware Repair 11-18-2020, 01:37 PM
Replies: 10
Views: 1,099
Posted By hodgey
The Z mechanism has two pins and 3 screws that...

The Z mechanism has two pins and 3 screws that align and fasten the drum assembly to the mechanism. I'm not sure if the pins are tapered or just cylindrical.
Forum: Video Hardware Repair 11-18-2020, 11:59 AM
Replies: 10
Views: 1,099
Posted By latreche34
The way JVC designed their mechanisms is by...

The way JVC designed their mechanisms is by having a tapered nipples that engage with the head assembly holes which gives a perfect head position every time, If the mechanism side don't have those...
Forum: Video Hardware Repair 11-18-2020, 08:31 AM
Replies: 10
Views: 1,099
Posted By hodgey
Are you sure you reconnected everything, and put...

Are you sure you reconnected everything, and put back anything that provides grounding in the mechanism? I haven't tinkered much with the z mech specifically, but e.g the philips turbo drive decks...
Forum: Video Hardware Repair 11-18-2020, 06:24 AM
Replies: 10
Views: 1,099
Posted By dpalomaki
Judging from the service manuals for the AG-1970...

Judging from the service manuals for the AG-1970 and AG1980 (the AG-1980 has a K-mechanism, a separate manual), so they may be different then yours:

With the AG-1980 mechanical adjustment include...
Forum: Video Hardware Repair 11-18-2020, 12:45 AM
Replies: 10
Views: 1,099
Posted By latreche34
Post a picture of what you have swapped out, If...

Post a picture of what you have swapped out, If the half drum then an alignment is required and head A and B must be clocked right, reversing them will give a symptom of black and white. If the head...
Forum: Video Hardware Repair 11-17-2020, 08:30 PM
Replies: 10
Views: 1,099
Posted By dpalomaki
The service manual should provide detailed...

The service manual should provide detailed instructions for electrical and mechanical adjustment after cylinder replacement. Both types of adjustment (electrical and mechanical) will likely be...
Forum: Video Hardware Repair 10-23-2020, 09:00 AM
Replies: 17
Views: 1,212
Posted By dpalomaki
Without a service manual and appropriate test...

Without a service manual and appropriate test equipment your options are limited.

You could do a close visual examination of the circuit boards for any evidence of bad components, especially...
Forum: Video Hardware Repair 10-22-2020, 07:48 AM
Replies: 17
Views: 1,212
Posted By dpalomaki
FWIW:...

FWIW: https://www.user-manuals.com/advanced_search_result.php?keywords=NV-HS930B&x=0&y=0&brand= appears to have it in PDF format for about $8 USD. I've obtained a couple manuals from them in the...
Forum: Video Hardware Repair 10-21-2020, 05:29 PM
Replies: 17
Views: 1,212
Posted By hodgey
This is VCR is new enough that it doesn't have a...

This is VCR is new enough that it doesn't have a separate head amplifier PCB. Most of the video decoding (other than special stuff like SVHS and TBC/DNR which may be on a separate PCB), head amp and...
Forum: Video Hardware Repair 10-20-2020, 09:56 AM
Replies: 17
Views: 1,212
Posted By dpalomaki
I don't know the specific model you have, so this...

I don't know the specific model you have, so this is just speculation. The audio drop outs might be the result of the detected audio RF signal fed to the stereo audio demodulator dropping below the...
Forum: Video Hardware Repair 10-17-2020, 05:34 AM
Replies: 17
Views: 1,212
Posted By lordsmurf
Audio dropouts? That's a new one for me. :hmm: ...

Audio dropouts? That's a new one for me. :hmm:

I'm sure it's possible, especially on a Panasonic (breaks too easily, more than JVC), but I've never come across this sort of audio error.

I can...
Forum: Video Hardware Repair 09-19-2020, 12:43 AM
Replies: 8
Views: 1,168
Posted By latreche34
That's not what I meant, but even those blue...

That's not what I meant, but even those blue markings indicate that someone is being in there already, Just return it if you can, aligning it to factory condition is going to be a pain without a...
Forum: Video Hardware Repair 09-17-2020, 03:31 PM
Replies: 8
Views: 1,168
Posted By latreche34
Red seal on tape guides, like nail polish, you...

Red seal on tape guides, like nail polish, you have to open the VCR and observe the tape path to see if the tape running smooth with no curling on the edges.
Forum: Video Hardware Repair 09-17-2020, 12:44 PM
Replies: 8
Views: 1,168
Posted By latreche34
If it plays some tapes fine I don't see any...

If it plays some tapes fine I don't see any problem with electronics, Try manual tracking by pushing P+/P- or Program Up/Program Down, some VCR's have Ch up/Ch down to access manual tracking and see...
Forum: Video Hardware Repair 09-17-2020, 09:10 AM
Replies: 8
Views: 1,168
Posted By hodgey
The symptoms sound like there is an issue with...

The symptoms sound like there is an issue with the tracking signal. If the VCR has trouble reading the tracking signal it will not be able to align up the rotation of the video heads to the tracks on...
Showing results 1 to 17 of 17

 

 
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