Brother LH4-B800E Service Manual download pdf (Page 164)

LH4-B800E 6 - 31

6. ELECTRIC MECHANISM

Code Countermeasure

E-42

1. Clean the exhaust cooling fan. (Remove dust.)

2. Check if connectors P1 and P20 on the main circuit board are securely inserted and if any

harness is broken or short-circuited.

3. Turn power off, check if connectors CN2, CN3 and CN4 on the 1-step power supply circuit board

are securely inserted and if any harness is broken or short-circuited.

* OK if 17 V AC is present between pins 4 and 5 of connector P20 on the main circuit board.

If not OK, replace the transformer.

4. Replace the cooling fan.

5. Replace the main circuit board.

E-44

1. Check if connector P3 on the sub circuit board is securely inserted and if any harness is broken

or short-circuited.

2. Check if connector P3 on the 2-step power supply circuit board is securely inserted and if any

harness is broken or short-circuited.

3. Check if connectors P10 and P13 on the sub circuit board are securely inserted and if any

harness is broken or short-circuited.

4. Check if connectors P22 and P23 on the main circuit board are securely inserted and if any

harness is broken or short-circuited.

5. Replace the 2-step power supply circuit board.

6. Replace the sub circuit board.

7. Replace the main circuit board.

E-51

E-52

1. Turn off the power and initialize the settings.

E-54

1. Automatically resets after 2 minutes. (Sewing data of 3,000 stitches or less will be valid, and any

sewing data past the 3000th stitch will be invalid.)

E-55

1. Turn off the power and then back on again. (Zigzagging and bar tacking will automatically be

halved, so the error display will disappear.)

2. If error E-55 appears again after the above operation is carried out, turn off the power and

initialize the settings.

E-59

1. Turn off the power and initialize the settings.

2. If error E-59 appears again after the above operation is carried out, replace the man circuit

board.

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Brother LH4-B800E Service Manual Page 164