Canon Eos Rebel T6i 750d Instruction Manual

							371
Troubleshooting Guide
The camera cannot be used with EF-M lenses (p.45).
 Install a recharged battery pack in the camera (p.
34).
 Make sure the card is properly inserted (p.
37).
 Slide the card’s write-protect switch to the write/erase position (p.
37).
 If the card is full, replace the card or delete unnecessary images to 
make space (p.37, 304).
 If you try to focus in the One-Shot AF mode and the focus indicator 
 in the viewfinder blinks, a picture cannot be taken. Press the 
shutter button halfway again to refocus automatically, or focus 
manually (p.50, 111).
 If a card error message is displayed, see page 37 or 382.
 Set the lens’s focus mode switch to < AF> (p.
45).
 Press the shutter button gently to prevent camera shake (p.49-50).
 If the lens has an Image Stabilizer, set the IS switch to < 1>.
 In low light, the shutter speed may become slow. Use a faster shutter 
speed (p.150), set a higher ISO speed (p.122), use flash (p.166), or 
use a tripod.
Shooting-Related Problems
The lens cannot be attached.
The viewfinder is dark.
No images can be  shot or recorded.
The card cannot be used.
The image is out of focus. 
						

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Set the AF operation to One-Shot AF. Focus lock is not possible in the 
AI Servo AF mode, or when servo takes effect in AI Focus AF mode 
(p.100).
 Depending on the subject, linear noise or moire may be recorded in 
the image. It is likely to occur especially in the following cases.
• Shooting fine horizontal stripes, lattice patterns, etc.
• When there is an intense light source such as sunlight or lighting in
or near the shooting range.
In such a case, noise and moire may be reduced by the following 
measures.
• Change the size of the subject by changing the focusing distance or zoom magnification.
• Recompose the shot to prevent an intense light source from entering the shooting range.
• Attach the lens hood to prevent intense light from entering the lens.
 If you use a TS-E lens and shift or tilt, linear noise or moire may be 
recorded in the image.
 Horizontal stripes (noise) or irregular exposures can be caused by 
fluorescent lighting, LED lighting, or other light sources during 
viewfinder or Live View shooting. Also, the exposure or color tone may 
not come out right. A slow shutter speed may solve the problem.
I cannot lock the focus  and recompose the shot.
Linear noise or moire appears in the image.
Horizontal stripes appear, or th e exposure or color tone look 
strange. 
						

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Troubleshooting Guide
Depending on the lens type, shutter speed, aperture, subject 
conditions, brightness, etc., the continuous shooting speed may 
become slower.
 If [z 3: Anti-flicker shoot. ] is set to [Enable] and you shoot under a 
flickering light source, the continuous shooting speed may become 
slightly slower, or the continuous shooting interval may become 
irregular. Also, the time lag until shutter release may be slightly longer 
than usual (p.144).
 If you set [ Distortion ] to [Enable ], the continuous shooting speed will 
decrease (p.141).
 If you shoot something that has fine detail such as a field of grass, the 
file size will be larger, and the actual maximum burst may be lower 
than the number mentioned on page 117.
 Under [ 54: Custom Functions (C.Fn) ], if [3: Highlight tone priority ] 
is set to [ 1: Enable ], ISO 100 cannot be set. If [ 0: Disable] is set, ISO 
100 can be set (p.339). This also applies to movie shooting (p.226).
 Under [ 54: Custom Functions (C.Fn) ], if [3: Highlight tone priority ] 
is set to [ 1: Enable ], the [H] ISO speed (equivalent to ISO 25600) 
cannot be selected even when [ 2: ISO expansion] is set to [1: On]. If 
[ 0: Disable ] is set for [ 3: Highlight tone priority ], [H] can be set 
(p.339).
 Under [ 54: Custom Functions (C.Fn) ], if [3: Highlight tone priority ] 
is set to [ 1: Enable ], the Auto Lighting Optimizer cannot be set. If [ 0: 
Disable] is set, the Auto Lighting Optimizer can be set (p.339).
The continuous shooting speed is slow.
The maximum burst during continuous shooting is lower.
ISO 100 cannot be set.
ISO speed [H] (equivalent to  ISO 25600) cannot be set.
The Auto Lighting Optimizer cannot be set. 
						

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374
Set [ z2: Auto Lighting Optimizer ] to [Disable ]. When [ Low], 
[ Standard ], or [High] is set, even if you set a decreased exposure 
compensation or flash exposure compensation, the image may come 
out bright (p.136).
 If you shoot at night when the background is dark, the shutter speed 
automatically becomes slow (slow-sync shooting) so that both the 
subject and background are properly exposed. To prevent a slow 
shutter speed, under [ z1: Flash control ], set [Flash sync. speed in 
Av mode ] to [1/200-1/60sec. auto ] or [1/200 sec. (fixed) ] (p.174).
 In shooting modes (< A>     ) whose 
default setting is < a> (Auto flash), the built-in flash will be raised 
automatically when necessary.
 In the < x> and < G> modes, when you press the shutter button 
halfway under low-light conditions, the built-in flash may be raised 
automatically and emit the AF-assist beam.
 If you use the built-in flash too often in too short a period of time, the 
flash may stop firing for a while to protect the light-emitting unit.
Even though I set a decre ased exposure compensation, 
the image comes out bright.
When I use the < f> mode with flash, the shutter speed 
becomes slow.
The built-in flash rises by itself.
The built-in flash does not fire. 
						

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Troubleshooting Guide
If you use a flash unit other than an EX-series Speedlite, the flash will 
always be fired at full output (p.172).
 Under [ z1: Flash control ], if [Flash metering mode] in [External 
flash C.Fn setting ] is set to [TTL flash metering ] (autoflash), the 
flash will always fire at full output (p.178). 
 If flash exposure compensation is set with the external Speedlite, flash 
exposure compensation cannot be set with the camera. When the 
external Speedlite’s flash exposure compensation is canceled (set to 
0), flash exposure compensation can be set with the camera.
 Under [ z1: Flash control ], set [Flash sync. speed in Av mode ] to 
[ Auto] (p.174).
 A small noise may be heard when the camera’s internal mechanism 
moves slightly.
 If you use flash, the shutter will make two sounds each time you shoot 
(p.193).
The external flash always fires at full output.
Flash exposure compensation cannot be set for the 
external Speedlite.
High-speed sync cannot be set in the < f> mode.
The camera makes a small noise when it is shaken.
The shutter makes two sh ooting sounds during 
Live View shooting. 
						

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376
It indicates that the camera’s internal temperature is high. If the white 
 icon is displayed, the still photo’s image quality may deteriorate. 
If the red < E> icon is displayed, it indicates that the Live View or 
movie shooting will soon stop automatically (p.218, 253).
 If the card’s writing speed is slow, movie shooting may stop 
automatically. Use an SD Speed Class 6 “ ” or faster card. To 
find out the card’s reading/writing speed, refer to the card 
manufacturer’s Web site, etc.
 If the movie shooting time reaches 29 min. 59 sec., the movie shooting 
will stop automatically.
 In shooting modes other than < a>, the ISO speed is set 
automatically. In the < a> mode, you can freely set the ISO speed 
(p.226).
 If you change the shutter speed or aperture during movie shooting, the 
changes in the exposure may be recorded.
 Zooming the lens during movie shooting can cause changes in the 
exposure regardless of whether the lens’s maximum aperture changes 
or not. The changes in the exposure may be recorded as a result.
 If you move the camera to the left or right quickly (high-speed panning) 
or shoot a moving subject, the image may look distorted.
During Live View or movie shooting, a white < s> or 
red < E> icon is displayed.
Movie shooting stops by itself.
The ISO speed cannot be  set for movie shooting.
The exposure changes during movie shooting.
The subject looks distorte d during movie shooting. 
						

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Troubleshooting Guide
Flickering, horizontal stripes (noise), or irregular exposures can be 
caused by fluorescent lighting, LED lighting, or other light sources 
during movie shooting. Also, changes in the exposure (brightness) or 
color tone may be recorded. In the < a> mode, a slow shutter speed 
may reduce the problem.
 If the camera is connected to a computer, printer, GPS receiver, TV 
set, or other device with a cable, Wi-Fi cannot be set ([ 51: Wi-Fi/NFC ] 
will be grayed out). Disconnect the cable before changing any settings.
 For details, refer to the Wi-Fi/NFC Function Instruction Manual.
 Check if your finger is blocking the speaker (p.26).
 In Basic Zone modes and in movie shooting mode, certain tabs and 
menu options are not displayed. Set the shooting mode to a Creative 
Zone mode (p.53).
The image flickers or horizo ntal stripes appear during 
movie shooting.
Wi-Fi
Wi-Fi cannot be set.
Operation Problems
During touch screen operatio ns, the beeper suddenly 
sounds softer.
Display Problems
The menu screen shows fewer tabs and options. 
						

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Set the color space to sRGB. If Adobe RGB is set, the first character 
will be an underscore (p.146).
 It is a movie file (p.262).
 If the card already contains recorded images, the image number may 
not start from 0001 (p.262).
 Check that the correct date and time are set (p.42).
 Check the time zone and daylight saving time (p.42).
 The shooting date and time do not appear in the picture. The date and 
time are instead recorded in the image data as shooting information. 
When printing, you can imprint the date and time in the picture, using 
the date and time recorded in the shooting information (p.325).
 If the number of images recorded on the card exceeds the number the 
camera can display, [ ###] will be displayed (p.
285).
 If the LCD monitor is dirty, use a soft cloth to clean it.
 In low or high temperatures, the LCD monitor display may seem slow 
or may look black. It will return to normal at room temperature.
The file name’s first character is an underscore (“_”).
The file name starts with “MVI_”.
The file numbering does not start from 0001.
The shooting date and time displayed is incorrect.
The date and time ar e not in the picture.
[###] is displayed.
The LCD monitor does not display a clear image. 
						

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Troubleshooting Guide
[Eye-Fi settings] will appear only when an Eye-Fi card is inserted in 
the camera. If the Eye-Fi card has a write-protect switch set to the 
LOCK position, you will not be able to check the card’s connection 
status or disable Eye-Fi transmission (p.352).
 It is the highlight alert (p.310). Overexposed areas with clipped 
highlight will blink.
 If the image is protected, it cannot be erased (p.302).

Movies edited with a computer cannot be played back with the camera.
 If you operate the camera’s dials or lens during movie shooting, the 
operation noise will also be recorded. Using an external microphone 
(commercially available) is recommended (p.251).
 During autoexposure movie shooting, if there is a drastic change in the 
exposure level, the recording will stop momentarily until the brightness 
stabilizes. In such cases, shoot in < a> mode (p.225).
[Eye-Fi settings] does not appear.
Playback Problems
Part of the image blinks in black.
The image cannot be erased.
The movie cannot  be played back.
Camera operation noise can be heard when the movie is 
played back.
The movie has still moments. 
						

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380
Check that the HDMI cable or stereo AV cable’s plug is inserted all the 
way in (p.298-301).
 Set the [ 53: Video system ] correctly to [NTSC] or [PA L ] (depending 
on the video system of your TV set).
 If [51: Wi-Fi/NFC ] is set to [Enable], the camera cannot be connected 
to a TV set. Set [ Wi-Fi/NFC] to [Disable ], then reconnect the camera 
to the TV set with the HDMI cable or stereo AV cable.
 If the movie file size reaches 4 GB, another movie file will be created 
automatically (p.235).
 Depending on the card reader and computer OS used, SDXC cards 
may not be correctly recognized. In such a case, connect your camera 
to the computer with the interface cable, then transfer the images to 
your computer using EOS Utility (EOS software, p.404).
 JPEG  c and RAW images cannot be resized or cropped (p.315, 
p.317).
 [32: AF point disp. ] is set to [Enable] (p.309).
 Even if [ 32: AF point disp. ] is set to [Enable] (p.309), the red box is 
not displayed for the following images:
• Images shot with Multi Shot Noise Reduction (p.137)
• Images recorded with distortion correction enabled (p.141)
• Images shot with < F> or < G> in < 8> mode
• Cropped images (p.317)
• Images with Fish-eye effect applied after shooting (p.312)
No picture on the TV set.
There are multiple movie file s for a single movie shoot.
My card reader does not recognize the card.
I cannot resize the image.  I cannot crop the image.
A red box is displayed on the image.
A red box is not displayed on the image.