SainSmart Prusa i3 Programming manual

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Troubleshooting Manual
Please be aware of these options as follows :
1. Mainboard is sensitive to static electricity. Please Touch
a grounded object to release static electricity before
operation.
2. Please ensure the power wire connection is correct.
3. Please Cut off the power when changing interface connection.

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Contents
Problem Collection................................................................................................................. 3
1. Black Screen....................................................................................................................... 5
2. White Square...................................................................................................................... 6
3. Temp Display: def.............................................................................................................. 6
4. Extruder Temp Doesn’t Rise ............................................................................................ 7
5. Hotbed Temp Doesn’t Rise .............................................................................................. 8
6. Motor Issue ......................................................................................................................... 8
7. Limited Switch Issue.......................................................................................................... 9
8. SD Card Issue .................................................................................................................. 10
9. Online Printing Issue ....................................................................................................... 10
10. Extruder/Hotbed Temp Inconsistent........................................................................... 12
11. Extruder / Hotbed Temp Keeps Rising After the Boot.............................................. 13

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Problem Collection
2.White Square
3.Temp Display: def
4.Extruder Temp Doesn’t Rise
5.Hotbed Temp Doesn’t Rise
6.Motor Issue
7.Limited Switch Issue
8.SD Card Issue
1.Black Screen

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9.Online Pringting Issue
10. Extruder / Hotbed Temp
Inconsistent with Display
11.Extruder / Hotbed Temp Keeps
Rising After the Boot

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1. Black Screen
Step 1 . Check Power Supply
Step 2 . Check Mainboard
AC 110V/220V
Power Indicator
Voltage Selection
a. Check the power indicator, if the light is on , move to Step 2 ;
b. If the light is off, check the wire connection & voltage selection if they are correct ;
c .If the light is off and they are correct, you need to replace a power supply.
a. Check if the 40X40 Fan is running. If not,
please check the wire connection between
power & mainboard is correct and the wire is
not loose;
b. Click Reset Button on the mainboard , check
D1 indicator :
- If D1 lights on for a second then went out and
screen is black, try to reconnect screen wire for
several times , if still not working , you need to
replace a screen.
- If D1 indicator is always off and screen is
black you need to replace a mainboard.

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2. White Square
Step 1 . Check Mainboard
3. Temp Display: def
Step 1 . Click Reset , check screen
a. Click Reset button, check D1 indicator:
- If D1 lights on for a second then went out
and screen is full of white square, try to
reconnect screen wire for several times .when
it’s well connected , click Reset button.If still
not working , you need to replace a screen.
- If D1 indicator is always off and screen is full
of white square, you need to replace a
mainboard.
Click Reset and check screen. The temp will turn to def in a second . As showed
above , the extruder temp is -50.9 , means thermistor cannot detect temp.

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Step 2 . Change wires of E_T , B_T port and click Reset , check screen
4. Extruder Temp Doesn’t Rise
Step 1 . Check Mainboard
Step 2 . Check Extruder
a. Screen Operation
Quick Settings → Preheat PLA The screen will
show the extruder is preheating.
b. If D5 indicator doesn’t light on , you need to
replace mainboard .
c.If D5 indicator lights on , please check End port
connection . If the connection is good , you need
to replace extruder heating pipe.
If Step 1 & 2 both shows abnormal extruder temp , you need to replace extruder
thermistor; If Step 1 & 2 both shows abnormal hotbed temp, you need to replace
hotbed thermistor;
If Step 1 shows abnormal extruder temp while Step 2 shows abnormal hotbed
temp , or Step 2 shows abnormal extruder temp while Step 1 shows abnormal
hotbed temp, you need to replace mainboard.
D5

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5. Hotbed Temp Doesn’t Rise
Step 1 . Check Screen Operation
Step 2 . Check hotbed connection
6. Motor Issue
Step 1 . Motor Test
a. Screen Operation
Quick Settings → Preheat PLA
b. Check D4 indicator .If the it doesn’t
light on , you need to replace a
mainboard; if D4 indicator lights on ,
please check BED port connection .
If no connection problem , you need
to replace a hotbed.
D4

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7. Limited Switch Issue
Step 1 . Limited Switch Test
Before Exchange:
Choose X Pos.Fast , test X Limited Switch:
Abnormal; Choose Y Pos.Fast , test Y Limited
Switch: Normal
After Exchange:
If Choose X Pos.Fast , test Y Limited Switch:
Abnormal; Choose Y Pos.Fast , test X Limited
Switch: Normal. You need to replace a
mainboard.
If Choose X Pos.Fast , test Y Limited Switch:
Normal; Choose Y Pos.Fast , test X Limited
Switch: Abnormal.You need to replace a
limited switch.
You can use same method to test other
limited swtich.
Example: Before exchange , X Pos.Fast ,X motor is abnormal . Y Pos.Fast, Y
motor is good. Change X, Y motor connection , X Pos.Fast, Y motor is
abnormal. Y Pos.Fast, X motor is good. You need to replace a mainboard; or
X Pos.Fast , Y motor is good. Y Pos.Fast, X motor is abnormal, you need to
replace X motor.
Y_Stop
X_Stop
Before Clicking
Limited Switch
After Clicking
Limited Switch
Example: X Limited Switch Testing

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8. SD Card Issue
FAQ: No “Print file” Option When SD is correctly installed
Step 1 . Test SD card if it can be recognized by PC and store files.
Step 2 . Reinstall SD card for several times to ensure SD card is correctly installed.
9. Online Printing Issue
Please ensure the printer can use SD card to offline printing and all functions are OK.
Question 1 : repetier fail to connect
Step 1 . Check on PC if it can find CH340G
If PC can’t recognize SD card , you need to replace a SD card;If PC can
recognize SD card and you can store files in SD card, move to Step 2 . If there is
still no “Print file” Option , you need to replace a mainboard.
If the SD card & Hotbed is good , there’ll be “Print file” Option

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Question 2 : repetier connected , but fail to control the printer
Step 1 . Confirm repetier is correctly set
Check on PC if there is USB
SERIAL . If not , please find
the file in SD card and install
it .
It depends on CH340G
code
Open repetier , open “Printing
seting” , the correct setting is info
above.

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Step 2 . Open Toggle Log to check if there is any problem
10. Extruder/Hotbed Temp Inconsistent
Step 1 . Thermistor test
Open the option
below to record.
Check the info if it’s
normal . If not , you need
to replace a mainboard.
Extruder Temp
Hotbed Temp
As showed in the picture , the
extruder & hotbed temp should
be consistent with indoor temp ,
but now the extruder temp is
175℃.

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Step 2 . Change wires of E_T , B_T port and click Reset , check screen
11. Extruder / Hotbed Temp Keeps Rising After the Boot
Question: The extruder / hotbed temp keeps rising after booting with no operation
Step 1 . Extruder temp check
Step 2 . Hotbed temp check
If it shows abnormal extruder temp , you need to replace extruder thermistor; If it
shows abnormal hotbed temp, you need to replace mainboard.
(If the hotbed temp is abnormal, please do test refer to methods above)
D5
Check D5 indicator , if it’s on ,
turn off the printer and restart , if
D5 indicator is still on , you
need to replace a mainboard.
D4
Check D4 indicator , if it’s on ,
turn off the printer and restart , if
D4 indicator is still on , you need
to replace a mainboard.