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Brother International RH-981A Instruction Manual - Spanish - Page 87

Troubleshooting

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13. TROUBLESHOOTING 13. TROUBLESHOOTING If there is a problem with operation, first check that the threads are correctly threaded and that the needle is correctly installed. CAUTION Turn off the power switch and disconnect the power cord before carrying out troubleshooting, otherwise the machine will operate if the start switch is pressed by mistake, which could result in injury. MACHINE HEAD Problem Thread breaks. Skipped stitches occur. Needle breaks. Cause Remedy Thread tension control nut Adjust to an appropriate pressure is too strong. pressure. Thread is of poor quality. Use a better-quality thread. Thread is too thick for the Use a differently-size needle. needle. Needle groove or needle hole are not smooth. Replace with a new needle. Needle and looper adjustment is Adjust the needle bar height or incorrect. the looper and spreader height. Needle, looper, throat plate or thread path is damaged. Repair the damage with an oilstone or buffer, or replace the damaged part. Thread tension control nut pressure is too strong or too weak. Adjust to pressure. an appropriate Needle point is broken or bent. Replace with a new needle. Needle and looper adjustment is incorrect, or clearance is Adjust correctly. incorrect. Needle and needle adjustment is incorrect. Looper tip is blunt. Needle is bent. guard Adjust correctly. Repair with an oilstone or replace the looper with a new one. Replace with a new needle. Needle and looper adjustment is Adjust the needle bar height or incorrect. the looper and spreader height. Needle and needle adjustment is incorrect. guard Adjust correctly. Page 47 28 55 47 28 56 59 28 55 59 RH-981A 80

Section	Page
RH-981A COVER	1
SAFETY INSTRUCTIONS	2
1. Safety indications and their meanings	2
2. Notes on safety	3
3. Warning labels	5
CONTENTS	6
1. NAMES OF EACH PART	8
2. SPECIFICATIONS	9
2-1. Specifications	9
2-2. Sewing shape	10
2-3. Optional parts	10
2-4. PD-9810, Programmer	10
2-5. Replacement parts list for specification changes	11
3. INSTALLATION	12
3-1. Table processing diagram	12
3-2. Installing the motor	13
3-3. Installing the motor pulley	14
3-4. Installing the control box	14
3-5. Installing the machine head	15
3-6. Installing the oil container	17
3-7. Installing the operation panel	17
3-8. Tightening the V-belt	18
3-9. Installing the spool stand	19
3-10. Installing the hand switch	19
3-11. Installing the air unit and the valve unit	19
3-12. Connecting the wiring	20
3-12-1. Connections inside the control box	21
3-12-2. Connecting the motor cables	22
3-12-3. Connecting the air tubes	22
3-12-4. Securing the cables	23
3-13. Installing the air tubes	24
3-13-1. Adjusting the air pressure	24
3-14. Connecting the power cord	25
3-15. Installing the programmer (sold separately)	26
3-16. Installing the foot switch (option)	26
3-17. Installing the indexer (option)	27
3-17-1. Installing the indexer main unit	27
3-17-2. Installing the upper thread presser	28
3-17-3. Replacing the plate presser and presser plate	28
3-17-4. Installing the valve unit	28
3-17-5. Connecting the connectors	29
3-17-6. Connecting the air tubes	30
3-17-7. Securing the air tubes and cables	30
3-17-8. Installing the hand switch	31
4. LUBRICATION	32
4-1. Adding oil	32
4-2. Lubrication	32
5. CORRECT USE	34
5-1. Data initialization	34
5-2. Changing the lower thread and gimp trimming	34
5-3. Installing the needle	35
5-4. Threading the upper thread	35
5-5. Threading the lower thread	36
5-6. Threading the gimp	37
5-7. Setting the material	38
5-8. Setting the installation position for cloth feed plate (L) (-52 specifications)	40
5-9. Replacing the PROMs	41
6. OPERATION	42
6-1. Name and function of each operation panel item	42
6-2. Starting up	43
6-3. Program setting method	44
6-3-1. Parameter table (Taper bar)	44
6-3-2. Parameter table (Straight bar tacking)	47
6-4. Cycle program	50
6-5. Production counter	51
6-6. Using the program memos	51
7. SEWING	52
7-1. Automatic sewing	52
7-2. Using the EMERGENCY STOP switch	53
7-3. Adjusting the thread tension	54
7-4. Needle and knife position	55
7-5. Setting the feed bracket to the front position	56
7-6. Switching between single-pedal and dual-pedal operation	56
7-7. Using test feed mode	57
7-8. Using manual mode	58
7-9. Changing the mode during an operation	59
7-10. Moving the cloth feed bar (-52 specifications)	59
8. CLEANING AND MAINTENANCE	60
8-1. Cleaning	60
8-2. Draining the oil	61
8-3. Checking the air filter	61
9. STANDARD ADJUSTMENTS	62
9-1. Adjusting the height of the spreader and looper	62
9-2. Adjusting the needle and looper timing	63
9-3. Adjusting the loop stroke	64
9-4. Adjusting the height of the needle bar	65
9-5. Adjusting the clearance between the looper and needle	65
9-6. Adjusting the needle guard	66
9-7. Adjusting the spreader mounting positions	66
9-8. Adjusting the spreader timing	67
9-9. Adjusting the needle racking width (stitch width)	67
9-10. Changing the knife cutting length (Replacing the hammer)	68
9-11. Adjusting the contact between the knife and the hammer	69
9-12. Replacing the knife	70
9-13. Adjusting the cutting pressure	70
9-14. Adjusting the position of the work clamp plate	71
9-15. Adjusting the cloth opening amount	72
9-16. Adjusting the trimming of the upper thread	73
9-17. Adjusting the trimming of the lower thread and gimp	73
9-18. Adjusting the gimp length after trimming (-02, -52 specifications)	74
9-19. Lower thread presser (-02, -52 specifications)	74
9-20. Auxiliary clamp arm (-02, -52 specifications)	75
9-21. Adjusting the cloth feeding speed (-52 specifications)	75
9-22. Adjusting the cloth feed bar home position (-52 specifications)	76
9-23. Adjusting the indexer hole spacing (-52 specifications)	77
9-24. Adjusting the position of limit switch L (-52 specifications)	78
9-25. Adjusting the position of limit switch R (-52 specifications)	78
10. CHANGING FUNCTIONS USING THE MEMORY SWITCHES	79
10-1. Memory switch table	80
11. CHANGING FUNCTIONS USING THE DIP SWITCHES	81
11-1. Panel DIP switches	81
11-2. Circuit board DIP switches	82
12. LIST OF ERROR CODES	84
13. TROUBLESHOOTING	87

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13. TROUBLESHOOTING

RH-981A

13. TROUBLESHOOTING

If there is a problem with operation, first check that the threads are correctly threaded and that the needle is correctly

installed.

CAUTION

Turn off the power switch and disconnect the power cord before carrying out troubleshooting, otherwise

the machine will operate if the start switch is pressed by mistake, which could result in injury.

MACHINE HEAD

Problem

Cause

Remedy

Page

Thread

tension

control

nut

pressure is too strong.

Adjust

appropriate

pressure.

Thread is of poor quality.

Use a better-quality thread.

Thread is too thick for the

needle.

Use a differently-size needle.

Needle groove or needle hole

are not smooth.

Replace with a new needle.

Needle and looper adjustment is

incorrect.

Adjust the needle bar height or

the looper and spreader height.

Thread breaks.

Needle, looper, throat plate or

thread path is damaged.

Repair the damage with an

oilstone or buffer, or replace the

damaged part.

Thread

tension

control

nut

pressure is too strong or too

weak.

Adjust

appropriate

pressure.

Needle point is broken or bent.

Replace with a new needle.

Needle and looper adjustment is

incorrect,

clearance

incorrect.

Adjust correctly.

Needle

and

needle

guard

adjustment is incorrect.

Adjust correctly.

Skipped stitches occur.

Looper tip is blunt.

Repair

with

oilstone

replace the looper with a new

one.

Needle is bent.

Replace with a new needle.

Needle and looper adjustment is

incorrect.

Adjust the needle bar height or

the looper and spreader height.

Needle breaks.

Needle

and

needle

guard

adjustment is incorrect.

Adjust correctly.