SERVICING

62ELECTRONIC CONTROL/IGNITION PCB REPLACEMENT

1Disconnect the electrical supply.

2Gain access to the controls area by removing the boiler front panel and pulling the control panel (refer to frame 30).

3Remove the screws A and remove the service panel

4To gain access to the electronic control/ignition p.c.b. remove the screws B and remove the control panel lid.

B

SERVICING

A

B

Control panel lid

Service panel

5Remove all the wiring connected to the electronic control/ignition p.c.b.

To disconnect the connectors indicated, delicately flex the hook present on one side of each socket.

8Unscrew the four screws that hold the electronic control/ignition p.c.b. on to the control panel.

9Remove it by lifting its rear edge and freeing it from any of the wiring.

10Re---assemble in reverse order.

Important

When re---assembling the electronic control/ignition p.c.b.:

11Fit the p.c.b. into the control panel by first inserting the front lower edge under the control knob shafts. Lower the rear edge and ensure that no wiring is trapped beneath.

12Insert the spindles in the control panel knobs until the notch C reaches the potentiometer edge. It is not necessary to force them in the knob.

13While tightening the screws that fix the electronic control/ignition p.c.b. on the control panel, keep the p.c.b. towards the control panel fascia making sure of the contact between the boiler reset button D and the tab E. Replace the wiring connections ensuring correct engagement in the sockets

6To disconnect the connectors indicated in the next figure, delicately press the hook present on one side of each socket.

7Remove the spindles of the CH and DHW temperature adjustment knobs by delicately pulling them with pliers in the direction shown by the arrows.

C

 

 

C

D

E

 

Attention

 

 

After installing the electronic control/ignition p.c.b.:

14Make sure the CH () and DHW ( ) temperature

adjustment knobs can move freely for the complete range. If not, remove the spindle again as described at step 7, turn the knob half a turn and re---insert the spindle.

15Operate the boiler and close the gas inlet cock so that the boiler goes into the safety lock---out state.

Verify the correct operation of the boiler reset button by pressing and releasing it.

16Open the gas inlet cock and check the boiler operates correctly.

The replacement PCB is supplied pre---set for Natural Gas and an anti cycling time of 3 minutes. If the installation requires adjustment of these settings refer to frames 35 and 36 for the procedures

mini HE --- Installation & Servicing

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Mamiya C28, C32, C24 manual Servicing Electronic CONTROL/IGNITION PCB Replacement

C28, C24, C32 specifications

The Mamiya C series is celebrated among photography enthusiasts for its unique twin-lens reflex (TLR) design, offering both a classic aesthetic and innovative features that set it apart in the world of medium format cameras. The C32, C24, and C28 models represent a range of technology and design advancements that cater to various shooting needs.

The Mamiya C32, introduced in the early 1970s, is renowned for its precision engineering and versatility. This model features interchangeable lenses, allowing photographers to switch between different focal lengths for creative flexibility. The camera supports 120 and 220 film formats, enabling higher film capacities for extended shooting sessions. An essential feature of the C32 is its built-in light meter, which enhances exposure accuracy by providing real-time readings. The camera's bright waist-level finder offers excellent viewing comfort and composition aid, attracting those who appreciate a more hands-on shooting experience.

Next in line, the Mamiya C24 offers a slightly more compact and lighter design, making it an appealing option for documentary and street photographers. While still featuring the electronic leaf shutter system utilized in the C32, the C24 omits built-in metering, which encourages users to develop their exposure skills. The lens selection remains robust, with options ranging from wide-angle to telephoto, allowing for creative versatility. The C24's rugged build quality and reliable shutter performance make it a trusted companion in various shooting conditions.

Lastly, the Mamiya C28 provides a perfect blend of portability and advanced capabilities. With its ergonomic design and improved lens coatings, the C28 offers enhanced image quality with better contrast and sharpness. Similar to its predecessors, it utilizes an interchangeable lens system but enhances user convenience through quick-to-use shutter speeds and aperture settings. The camera is also compatible with a range of accessories, such as flash units and close-up attachments, further expanding its creative potential.

In summary, the Mamiya C32, C24, and C28 each present unique features and technological advancements that cater to various types of photographers. Whether it's the precision of the C32, the compact convenience of the C24, or the versatile performance of the C28, these cameras maintain a special place in the hearts of medium format enthusiasts, showcasing the blend of craftsmanship and innovation that Mamiya is known for.