Where do I find the serial number on the Sony HVL-F32X Flash Unit?

SOURCE: Sony HVL-F32X manual

Hi,

You can download and print the instruction manual in PDF format by clicking this link.

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SOURCE: sony hvl-f32x

I managed it by buying a broken (non-working) F32X from an auction service for something like 5 bucks. I just made sure (by looking at the photos) that the hotshoe was intact.

Here's how to disassemble and replace foot (I got to this by trial and luckily no error ^^).

1. Unscrew 2 small screws located under the battery flip cover.
2. Put the lamp (moving part) in the upright position.
3. Unscrew 1 small screw above the infared sensor (below the main lamp part which you moved to the upright position).
4. Remove the cover of the infared sensor by gently pulling forward.
5. On two sides of the infared sensor there are two small clips which hold the 2 casing pieces together. Then pull the pieces apart gently. Just behind the hotshoe casing you can see a small plastic inset -- place a screwdriver sideways between this inset and the hotshoe to help you separate the two casing parts. Be careful when doing that, don't use too much force, wiggle the casing instead to make this easier (this is the most tricky part).
6. When the electronics is exposed, there is a single screw in the middle of the motherboard. Remove the screw and gently pull the motherboard away from the casing. You do not have to pull it all the way or disconnect any cables, you just need to make sure the bottom battery connectors are pulled out of the casing just a little, because then under the two middle battery connectors (looking from the top, as if you were putting the batteries in) you can see two screws!
7. Unscrew those two screws, and the hotshoe will come apart. Pull it out gently and remove a single electrical connector that connects it to the flash.
8. Do this in case of your working lamp (with a broken hotshoe) and your replacement lamp (with a good hotshoe), and just move the good hotshoe to your working lamp.

SOURCE: Hot shoe plastic section broke on flash unit

I managed it by buying a broken (non-working) F32X from an auction service for something like 5 bucks. I just made sure (by looking at the photos) that the hotshoe was intact.

Here's how to disassemble and replace foot (I got to this by trial and luckily no error ^^).

1. 
   Unscrew 2 small screws located under the battery flip cover.
2. Put the lamp (moving part) in the upright position.
3. Unscrew 1 small screw above the infared sensor (below the main lamp part which you moved to the upright position).
4. Remove the cover of the infared sensor by gently pulling forward.
5. On two sides of the infared sensor there are two small clips which hold the 2 casing pieces together. Pull them away from the casing just a tiny bit and use something to keep them in this position (I used 2 small nails). Then pull the pieces apart gently.
6. Just behind the hotshoe casing you can see a small plastic inset -- place a screwdriver sideways between this inset and the hotshoe to help you separate the two casing parts. Be careful when doing that, don't use too much force, wiggle the casing instead to make this easier (this is the most tricky part).
7. When the electronics is exposed, there is a single screw in the middle of the motherboard. Remove the screw and gently pull the motherboard away from the casing. You do not have to pull it all the way or disconnect any cables, you just need to make sure the bottom battery connectors are pulled out of the casing just a little, because then under the two middle battery connectors (looking from the top, as if you were putting the batteries in) you can see two screws!
8. Unscrew those two screws, and the hotshoe will come apart. Pull it out gently and remove a single electrical connector that connects it to the flash.