Brother International T-8752C Instruction Manual - English - Page 90

T-8421C, 8422C, 8452C, 8722C, 8752C

14. TROUBLESHOOTING

81

Error code

Possible cause

Page

E090

Treadle

connector is not

connected.

・

Is the 4-pin treadle connector inside the control box disconnected?

Press the power OFF switch, and then check that the 4-pin treadle connector is

connected to connector P14 on the main PCB.

If there is a broken wire in the cord of the treadle connector, replace the treadle

unit.

*

**

E091

・

The settings in “Setting method for standard depression stroke” may be incorrect.

Redo the settings in “Setting method for standard depression stroke”.

・

Problem with treadle unit.

Replace the treadle unit.

*

**

E095

・

Was the power ON switch pressed while the treadle was still depressed?

Return the treadle to the neutral position. When the treadle neutral position is

detected, the error will be cleared and normal operation will then be possible.

・

Is the power supply voltage too low?

Check the power supply voltage.

*

E111

・

The sewing machine could not stop correctly at the needle up stop position after

thread trimming.

Remove any thread scraps that may be blocking the motor.

Press the power OFF switch and then turn the machine pulley by hand and

check that it turns easily.

Check that there are no problems with the thread trimming mechanism.

*

*

**

E130

The sewing machine or motor do not operate when the treadle is depressed.

・

Is the 4-pin motor connector inside the control box disconnected?

Press the power OFF switch and check the connection of the 4-pin motor

connector.

・

Has the sewing machine locked up?

Press the power OFF switch and then turn the machine pulley by hand and

check that it turns easily.

・

Problem with control box.

Replace the control box.

12*

*

**

E131

Problem with

motor encoder

signal.

・

Is the 10-pin resolver connector inside the control box disconnected?

Press the power OFF switch, and then check that the 10-pin resolver connector

is connected to connector P6 on the main PCB.

・

Problem with motor or main PCB.

Replace the motor or the control box.

12*

**

E132

Problem with

motor operation.

・

Problem with motor.

Replace the motor.

・

Problem with drive PCB.

Replace the control box.

**

**

E140

Motor reverse

operation.

・

Motor reverse operation was detected.

Replace the motor.

**

Section	Page
COVER	1
SAFETY INSTRUCTIONS	3
1. Safety indications and their meanings	3
2. Notes on safety	4
3. Warning labels	6
CONTENTS	8
1. MACHINE SPECIFICATIONS	10
2. NAMES OF MAJOR PARTS	12
3. INSTALLATION	13
3-1. Table processing diagram	14
3-2. Installation	14
3-3. Lubrication	18
3-4. Connecting the cords	20
3-4-1. Opening the control box cover	20
3-4-2. Connecting the cords	20
3-5. Test operation (Operating the treadle)	25
3-6. Adjusting the treadle operation	26
4. PREPARATION BEFORE SEWING	27
4-1. Installing the needle	27
4-2. Removing the bobbin	28
4-3. Winding the lower thread	29
4-4. Installing the bobbin	30
4-5. Threading the upper thread	32
4-6. Adjusting the stitch length	34
4-7. Using the knee lifter	34
4-8. Using the thread wiper (models with thread trimmer only)	34
4-9. Corner sewing method (T-8452C, 8752C)	35
4-9-1. To stop the needle bars (right and left)	35
4-9-2. Number of stitches: quick-reference guide	35
5. USING THE G50 OPERATION PANEL(BASIC OPERATIONS)	36
5-1. Names and functions	36
5-2. Sewing start and end backtack stitches	38
5-3. Sewing continuous backtack stitches	39
5-4. Sewing fixed stitches	40
5-5. Sewing pleat presser stitches	41
5-6. Using the lower thread counter	42
6. USING THE G50 OPERATION PANEL(ADVANCED OPERATIONS)	43
6-1. Names and functions	43
6-2. Adjusting the needle up stop position	44
6-3. LOCK key	45
6-4. Resetting all settings to their defaults	46
7. USING THE G10 OPERATION PANEL(BASIC OPERATIONS)	47
7-1. Names and functions	47
7-2. Sewing start and end backtack stitches	48
7-3. Sewing continuous backtack stitches	49
8. USING THE G10 OPERATION PANEL(ADVANCED OPERATIONS)	50
8-1. Changing the needle stop position	50
8-2. Slow start	51
8-3. Correction sewing	52
8-4. Thread trimming lock (models with thread trimmer only)	53
8-5. Setting the maximum sewing speed	54
8-6. Adjusting the needle up stop position	55
8-7. Lock function	56
8-8. Resetting all settings to their defaults	56
9. SEWING	57
9-1. Sewing	57
9-2. Backtacking	58
9-3. Sewing condensed stitches	59
10. THREAD TENSION	60
10-1. Adjusting the thread tension	60
10-2. Adjusting the presser foot pressure	61
10-3. Adjusting the presser foot floating amount (minute lifting amount)	62
10-4. Adjusting the trailing length after thread trimming (models with thread trimmer only)	62
10-5. Adjusting the thread take-up amount	63
11. CLEANING	64
11-1. Daily cleaning procedures	64
11-2. Lubricating via the oil cover (every 6 months)	65
11-3. Applying grease (Semi dry specifications)[When “GrUP” appears ... When using the G50 operation panel]	66
11-4. Applying grease (Semi dry specifications)[When “GrUP” appears ... When using the G10 operation panel]	69
12. ADJUSTING THE ROTARY HOOK LUBRICATION AMOUNT	72
13. STANDARD ADJUSTMENT	73
13-1. Safety switch position	73
13-2. Thread take-up amount for thread take-up spring	74
13-3. Thread take-up spring tension	75
13-4. Clearance between rotary hook and needle plate	76
13-5. Clearance between rotary hook and opener	77
13-6. Presser foot height	77
13-7. Needle and rotary hook timing	78
13-8. Installing the feed dog	80
13-9. Feed dog position	81
13-10. Feed dog height	82
13-11. Feed dog angle	83
14. TROUBLESHOOTING	84
14-1. Sewing	84
14-2. Error code displays	89
15. 7-SEGMENT DISPLAY	93

Brother International T-8752C Instruction Manual - English - Page 90

TROUBLESHOOTING, Error code, Possible cause, Problem with control box.

Page 90 highlights