Vast bedankt,

Wim Koster

Ik ben Chris en nieuw op dit forum, en eerder een groentje wat betreft elektronica, maar ik wil het wagen en ben op zoek naar alle verhelderende info over een Pentax Spotmeter V lichtmeter, een toestel van minstens vijftig jaar oud. Alles wat uitleg kan verschaffen zoals schema’s of onderdelenlijsten zou mij kunnen helpen. Misschien dat iemand enige info inzake heeft?

Bedankt bij voorbaat,

Groeten,

Chris

⟐ Answered juni 21, 2022 at 6:21 MST

Als aanvulling bij mijn vorige vraag over een oude analoge Pentax Spotmeter V lichtmeter, tracht ik het volgende component te identificeren dat er in zit.

Het is een klein dingetje, lijkt eerder op een condensator dan op een weerstand, hoewel het -gemeten met een rudimentaire multimeter en al even rudimentaire kennis- aangeeft dat het 178 Ohm bedraagt. Ik tast in het duister,maar ik dacht dat het misschien een thermistor zou kunnen zijn? Het is bruinachtig van kleur en heeft een witte (of lichtgrijze ) streep erop geschilderd, misschien een kleurcode?het is zoals aangegeven 50 jaar oud en waarschijnlijk gemaakt door Honeywell in de VS voor Pentax.

Elke informatie is welkom,

Van harte bedankt!

⟐ Answer edited februari 17, 2020 at 14:44 MST

⟐ Commented augustus 28, 2026 at 9:38 MST

The camera was fully disassembled and reassembled. I cleaned the shutter blades only I did not disassemble the electromagnet/timer assembly.

Current symptoms:

• Mechanical M and 125X modes work perfectly.
• Bulb (B) works normally.
• The light meter is working correctly and the LED display changes as expected with different lighting.
• In AUTO mode the shutter occasionally remains open indefinitely. The problem is completely random and can happen at any shutter speed.
• While the shutter is stuck open, the selected shutter speed LED in the viewfinder remains illuminated.
• Switching the mode dial to 125X or M immediately closes the shutter.
• Removing the batteries also immediately closes the shutter.
• The advance lever remains locked while the shutter is stuck.
• The self-timer behaves exactly the same as pressing the shutter release directly.
• Tapping the camera body does not release the shutter.

From the service manual, it seems the electromagnet continues to be energized instead of being released. I'm trying to determine whether this is more likely caused by the timing/memory switch circuitry (SWT/SWM), a mechanical timing contact adjustment, or a fault on the PCB (transistor, capacitor, etc.).

Has anyone experienced this exact symptom after a CLA, or knows which contacts or adjustments should be checked next?

⟐ Answer accepted augustus 10, 2026 at 11:13 MST

⟐ Commented juli 21, 2026 at 18:10 MST

Is there a way to easily remove the Back Cover without fully disassembling the camera?

⟐ Commented juli 15, 2026 at 18:04 MST

I recently purchased a Pentax LX from Japan and had already spent a considerable amount to fix the stuck mirror issue. However, upon receiving the camera, I discovered another problem: the light meter won't shut off. This is quite frustrating, as I have to remove the battery every time I'm not using the camera.

After some research, I found that this issue is quite common with the Pentax LX and that many repair technicians consider it unfixable due to the problem usually residing within the circuitry or main board.

Therefore, I came up with an idea: since the positive and negative terminals of the LX battery compartment are located within the camera body, and the battery door only serves to cover the battery, I was wondering if it would be possible to 3D print a battery door with a built-in switch. As shown in my rough sketch， pressing the button would push the battery up to contact the internal terminals, thus powering the camera. When not in use, pressing the button again would lower the battery, disconnecting it from the terminals.

My main challenges are that I lack experience in 3D modeling and cannot accurately measure the thread depth and diameter of the LX battery door. I believe the design of the switch's spring mechanism can be handled by professionals.

Therefore, I would greatly appreciate any suggestions or advice from the community. Has anyone attempted something similar or have any insights on how to proceed? Any help would be greatly appreciated.

Thank you in advance

⟐ Commented juli 14, 2026 at 9:46 MST

⟐ Commented maart 15, 2026 at 13:08 MST

I have a Pentax Optio S5i compact camera and I’m trying to figure out if it can be repaired.

Symptoms:

• When I press the power button, it starts to turn on
• I hear the normal startup sound, but then it makes a beep-beep error sound
• The lens does not come out
• The LCD screen stays black
• The camera does not fully power on

The battery is charged, and there was no drop or water damage.

Does anyone know what usually causes this problem?

Is this something that can be repaired, or is it a common failure on this model?

Any advice would be appreciated. Thanks!

⟐ Answered november 26, 2025 at 20:06 MST

I’m new to this forum and quite a newbie regarding electronics, so first of all hello to everybody.

I’m trying to fix a Pentax Spotmeter V light meter, an analog device that is at least 50 years old, and I’m looking for any information on schematics or parts that can help me out. Maybe there is someone trying to do the same as me or has the info I’m looking for?

Thanks!

All the Best,

Chris

⟐ Commented november 24, 2025 at 19:12 MST

⟐ Commented oktober 18, 2025 at 2:08 MST

⟐ Commented april 21, 2025 at 0:17 MST

⟐ Answer edited mei 11, 2024 at 11:55 MST

⟐ Commented mei 04, 2024 at 14:58 MST

⟐ Commented maart 19, 2023 at 11:23 MST