FAULT FINDING

Continued from page 54

of fault finding

Are LED 1 and LED 3

flashing with LED 2 on, plus lockout LED on the fascia on?

yes

Is there > 17 mbar at

the gas valve inlet?

yes

no

no

Rectify gas supply

fault.

Continued on

page 57 of fault finding

FINDING

yes

Is there a burner

no

pressure during

 

 

ignition period?

 

 

 

 

yes

 

 

 

 

 

no

Is there ignition at the burner?

yes

Continued on page 56 of

fault finding

Press reset button. Is

 

 

 

 

 

Is there

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

no

 

no

 

 

Is fuse

 

no

 

 

 

 

there 230V across the

 

 

230V at

 

continuity

 

Replace

Brown and Blue gas

 

 

 

 

 

Brown and

 

 

 

 

 

O.K. on

 

 

 

 

fuses

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

valve connection

 

 

 

 

 

Blue at

 

 

 

 

 

PCB?

 

 

 

 

 

 

 

 

during ignition?

 

 

 

 

 

gas valve

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

harness

 

 

 

 

 

yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

connector

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

on PCB?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace faulty PCB

 

 

 

 

 

 

 

 

 

 

 

 

 

Repair or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

replace

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

faulty wiring

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is there between 0V dc

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

no

 

no

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is the continuity of the

 

and 16V dc at the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

modulator harness

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

connections on the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

O.K?

 

 

 

 

modulating coil?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(0=min, 16=max)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

yes

 

 

 

no

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is the burner pressure

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Adjust burner pressure.

 

 

 

 

 

 

 

 

 

 

 

 

 

within min and max

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refer to frame 35.

 

 

 

 

 

 

 

 

 

 

 

 

 

value* with the boiler

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

running?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Repair faulty PCB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

yes

Repair faulty gas

valve

 

 

no

 

 

 

 

 

 

 

no

 

 

 

no

 

Is a spark

 

 

 

Are the ignition

 

 

 

 

 

 

 

 

Rectify

visible at the

 

 

 

 

leads

 

 

 

Are the ignition

 

 

faulty

burner during

 

 

 

disconnected

 

 

 

leads correctly

 

 

connection

ignition?

 

 

 

or damaged

 

 

 

connected to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

and sparking

 

 

 

PCB?

 

 

 

yes

 

 

 

 

to earth?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

yes

 

 

 

 

 

yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace

 

 

 

Replace

 

 

 

 

 

 

 

 

 

 

 

faulty PCB

 

 

 

 

 

 

 

 

 

faulty

 

 

 

 

 

 

 

 

 

 

 

electrode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

assy. Make

 

 

 

 

 

 

 

 

 

 

 

 

 

 

connection.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

no

 

 

 

 

 

 

 

 

 

 

Is the ignition burner

 

 

Adjust ignition burner

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

pressure correct? Refer

 

 

 

 

 

 

pressure

 

 

 

 

 

to frame 35.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

yes

Ensure the ignition electrode position and spark gaps are correct.

Rectify or replace. Refer to frame 49.

Repair or replace

faulty wiring

FAULT

* see Table 2 at page 4 for the correct value

mini HE --- Installation & Servicing

55

Page 55
Image 55
Mamiya C28, C32, C24 manual Fault

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.

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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.