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Manual: Solenoid replacement: Pentax K-S1
Posted By: photogem, 06-13-2019, 07:19 PM

Solenoid-Replacement Pentax K-S1

Tools required:
- Soldering iron with precision soldering-tip (such as Ersa Multi-Pro 20W, no butan-gas soldering pen = too hot!)
- Screwdrivers JIS 000 or PH000 + PH00 (JIS size works for all screws, PH000 for solenoid screw. JIS is preferable!)
- Tweezers or precision pliers
- Headlamp is very useful, makes things easier
- photos of K-S1 with location of screws, you find them HERE

- Print out all those photos, glue them on some cardboard, drill 2mm holes were the screws are located so you can later on stick all those screws into those holes. Makes it easier and safe due to different length of the screws.
- Make sure you took the battery out 24 hours prior undertaking the repair. This is for discharging the flash-condenser, which is well protected within the K-S1, nevertheless you don't want to risk getting a nasty shock! This condenser charges as soon as you open the pop-up-flash with battery inside the switched-on camera! So don't open the flash prior removal of the battery! You need to open it for access of 3 screws!

Sequence of opening the body (Body-cap is mounted on the K-mount for protection of sensor etc.)

1. Remove all screws from the bottom part: 6 x screws direct access, 2 x when the battery-door is opened: Careful: One of these screws holds a small metal plate which partly holds the right plastic side! Take this metal piece off with tweezers! There is another screw: 1 x deep within battery-case left side. The next photo shows this metal plate. Don't lose it!

2. Remove all 3 x screws from the left side (direct access)
3. Removal of screws right side: Open the HDMI/USB rubberdoor. Take off the HDMI/USB-sticker! Now you have access to the 2nd screw holding the plastic-side-piece. Unscrew it and take the plastic-side-piece off. Now you have access to 4 more screws, but you only need to unscrew the 2x front screws!

4. Removal of screws front: Take the rubber on the left side off. Now you have access to 3x screws, remove them.

Photo: Front rubber + HDMI-USB-sticker:

Photo: Hidden screw underneath HDMI-USB-Sticker:

Photo: Right plastic-side is removed: Red dots indicate the front screws which have to be removed:

Photo: Hidden screws underneath front rubber:

5. Take of the eye-piece: Unscrew the 2 x screws behind it.

6. Open the pop-up-flash (remember, no battery inside your camera!). Remove the 3 screws there plus the 2 screws next where the strap is fixed
7. Lift the top part with the flash slightly. Don't lift it off completely! This makes it easier to take of the front part!
8. AF/M-Switch on M! This has to be checked later on again!
9. Gently "pull off" the front part. There is a kind of nose which has to be lifted, here marked with red dots:

Now you have access to the solenoid.
Place the camera on some soft tissue as shown here:

Unsolder the solenoid. For this gently pull the wires forward, because they are fixed with some elastic glue to the left!

First unsolder the right purple wire, gently hold the wire with the tweezers while you touch the bare end soldered onto the solenoid until it comes off

Next 2 photos have been taken by a kind person not knowing about "DOF" and never had used my KP before... so when I noticed it this K-S1 was reassembled, it was too late. Anyway, these photos show you how easy it is to solder off the wires! Don't be scared!

Same for the left pink wire:

Photo: Solenoid with wires off:

Now you can unscrew the solenoid, the screw and right side of the solenoid is fixed with red thread-locking-lacquer which comes off easily.

You can see clearly were the solenoid is fixed to:
Left the nose and right the hole for the solenoid screw:

The lever for the plunger of the solenoid. It moves the shutter-mechanism:

Now solder a tiny amount of solder onto the bare ends of the pink and violet wire!

Screw the white "made in Japan" solenoid in.

Why this solenoid and no other one nor filing/sanding the faulty China-solenoid you can read about
HERE =Manual for solenoid-replacement Pentax K30/50/500

You might fix the screw and the left hole with some thread-locking-lacquer or nail-varnish:

Solder the wires back onto the solenoid. Make sure the solder holds well (Test by pulling the wires gently with the tweezers!):

Now you can stick/glue those two wires back to the left side as it was before with the green solenoid
as shown HERE

Re-Assembling of the body:

- Check that the inner and outer part of the AF/M-Switch are on M:
The inner part is on M when the screw-drive gear in this small hole in the metal K-bajonett is retreated!

Now the part "which demands good patience":

- Gently plug-on the front part again. You can see on the linked photo why this is a bit fiddly: The ON/OFF switch has to fit as well as the AF/M-Switch!

Remember to partly lift the top-part with the flash! Make sure the front sits well. Take your time, be patient. Don't push or force anything!

- Screw in the 3 screws which were hidden under the rubber. Fix the rubber to its place.

- Screw in the 2 screws in the right side. Fix the plastic-side-piece on the right side. Fix the small screw which was covered by the HDMI/USB strip!
Fix that one as well back on its place!

- Screw in the 3 screws for the left side and all 5 screws on the top!

- Fix the bottom part with all screws plus the small metal piece

- Insert the battery, an AF Lens and take a test photo with AV, TV or TAV and large or open aperture such as f2,8. All should be fine.

Last edited by photogem; 12-15-2019 at 10:22 PM.
Views: 774
06-14-2019, 09:44 AM   #2
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Location: Oxford, UK
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I hope I never have to do this but many thanks for this detailed set of instructions.
12-15-2019, 10:25 PM   #3
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Manual is updated with new photos and some refinements to the instructions and single steps.

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