Hi,

In the service manual for the CLD-95 (and others too), in the laser adjustment procedures they say to use an
"8-inch LD test disc GGV1003 ... (#100 and #22000 with a commercially available "karaoke" LD disc)"

I know I've seen a mention of karaoke discs in instructions for laser alignment somewhere before, but just cannot find it using Google. What is special with Karaoke discs that is important in this context? (Memory has it it has to do with track spacing at the start of the disc, but if so, what was the reason for that?)

Staffan

Since no one ever answered this, I will give it a try. One reason to use an eight-inch disc is that it may/will allow access to test points or adjustments that are physically blocked by a twelve-inch disc. Another possibility, if karaoke discs are CAV, is that you could pick specific frames where the lyrics on screen are different on two adjacent frames. This would give you an alternative to the official signals on test discs to allow adjustment to eliminate crosstalk, as one example.

If I am wrong here, others may have better answers.

half right, I know that the 8 inch is to get access to the adjustment points, but I've never heard of anything to test discs other than actual test discs.
So the Karaoke thing is a myth, sorry.

Since Karaoke LD players have extra circuitry/chipsets to handle microphones, reverb, etc.

Could a Karaoke LD TOC (table of contents) activate the Karaoke side of the player?

That wouldn't be for video testing, maybe audio testing.

Julien

I’m embarrassed I don’t know the answer to this question. I somehow have never owned a karaoke disc although I do have a 604 which has mic jacks on the front. I don’t know if I ever tried to use them.

From Staffan's original post, it is indeed referring to specific frames on an unspecified karaoke disc, so some of those discs are CAV, apparently. I have several karaoke discs here, but the one I had nearby is a CLV eight-inch disc. I will check my others to see if any are CAV, and if so, I will look at those two frames and let you all know what I see.

This is a good question. Once I fix my CLD-D604, I will play a karaoke disc and connect a couple of microphones, and see what it does.

I promise to --not-- post a video on Youtube of me singing, though.

It probably to test the audio settings of a karaoke player.

Like how some players can try to block out the voices of songs by trying to muffle the centralized audio on a regular song being played back (like on a regular CD if you didn't have a karaoke disc featuring a song you wanted to sing.)

I did try this (but I did not find my small stack of other karaoke discs to look for a Standard Play one yet). Just by plugging in one or two microphones, the player goes into karaoke mode, with an indicator on the front panel display. The player can indeed change the pitch of the music on a karaoke disc with the "key" buttons, so those discs clearly do something other than to send standard audio tracks directly to the output jacks. The "echo" control can add a good amount of delay to the microphone audio as well, and you can use your microphone(s) without even playing a disc, so there is the potential here to have some audio fun other than karaoke singing if you have one of these players. (Halloween is coming soon!)