Understanding Release Counts

Shutter / Mirror / Total Counts

Cameras have three important counts:

1. Shutter Count: This is the total number of times the shutter has been released.
2. Mirror Count: This is the total number of times the mirror has been released.
3. Total Count also known as the Release Count: It is the sum of the Shutter Count and Mirror Count, including all past shutter and mirror replacements.

• The Shutter and Mirror Counts can be Reset.
• The Total Release count CANNOT be reset!

This is the Shutter Count

It should be Reset when you replace the Shutter

This is the Mirror Count

It should be Reset when replacing the Mirror

This is the Total Release Count

The Release Count CANNOT be changed or reset!

The Total Release Count is displayed on the Camera's LCD. 

It acts as the camera's mileage indicator, representing the total number of releases

including all past shutter and mirror replacements.. 

Understanding Auto Focus Target Size

(Updated 20 softwares)

1.    Targets vary in size by model. Some are wider than others due to larger AF sensors and a larger field covered by the sensor.

2.    The grid graduations behind the AF chart is a ruler.  Each block should be exactly 10mm.  Count the number of blocks to find the correct target size.

Examples:  

• A 5 D Mk4 target has 18 graduations making the target size 180mm (± 1mm)  
• A 80D target has 16 graduations making the target size 160mm  (± 1mm)

As shown in Video #1:  The target size is measured across the width of the target and should fall within ±1mm.

Targets should be printed on Card Stock - 100gsm or thicker.

TEMPERATURE PLUGIN

Understanding How and Why

Problems:

• Camera displays an ‘Overheating’ warning - usually followed by a shut down.  This can happen as soon as the camera is turned ‘On’ or after several shots.
• One or more camera functions (AF, exposure, Light meter, Flash, etc) are out of calibration or are intermittent.
• This problem might happen before or after the Main PCB is replaced!

Possible Reasons:

• Temperature Sensor failure in one or more circuts  (such as:  Memory Card, Shutter, CMOS, AF or AE Units). Or a connection failure between the Unit and the Main PCB.
• Main PCB failure.
• Data Corruption.
• EEPROM Corruption.

Solutions:

• Start by saving the data files ( .crm and .dig files ) from the original Main PCB if possible. Do this using the Canon Service Adjustment software for that model.

• Open the Temperature Plugin in your Canon Service Adjustment software and check the temperatures in the different Units.

• Replace the .crm data file on the original or new Main with ‘Known Good Data’ - SPT can help with this if necessary.  You can do this without any disassembly.

If this solves the problem you have corrupt data and you can use the know good .cmr data file.  BUT .. you should check the calibration in other camera functions (such as:  AE, AF, Shutter)   

• Test the Temperatures again using the Temperature Plugin.

If the temperature is still badly out, its the Units temperature sensor / connection issue.  You should especially check the connection between the Unit and Main PCB.

If the Unit Temperature is only out by a few degrees, the EEPROM is probably corrupt.  You may need to send this to Canon for adjustment.