Brother BL6200, Service Manual

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PROBLEM CAUSE CORRECTION
17. No characters
1 line LCD 1 line LCD
appear on the
LCD.
1. Improper setting of LCD contrast key.
2. Disconnection of connector CN 1.
3. Voltage between terminal 2-1 of LW1
on motor control unit is less than
DC5V.
4. Inferior LCD unit.
Adjust LCD contrast key.
Connect CN1 on LCD unit.
Replace the motor control unit.
Replace the LCD unit.
4 line LCD 4 line LCD
1. Improper setting of LCD contrast
manual.
2. Disconnection of connector P1.
3. Disconnection of connector P5.
4. Voltage between terminal 2-1 of LW1
on motor control unit is less than
DC5V.
5. Inferior LCD control PCB or LCD
module.
Adjust LCD contrast manual.
Connect P1 on LCD control PCB.
Connect P5 on LCD module.
Replace the motor control unit.
Replace the LCD control PCB or LCD
module.
18. The message keys
1 line LCD 1 line LCD
do not work.
1. Message key top does not work.
2. Inferior LCD unit. Check the message key and key top.
Replace the LCD unit.
4 line LCD (A,B,
↓
,
↑
) 4 line LCD (A,B,
↓
,
↑
)
1. Each key tops do not work.
2. Inferior LCD control PCB. Check each keys and key tops.
Replace the LCD control PCB.
19. The LCD contrast
1 line LCD 1 line LCD
cannot be adjusted.
1. LCD contrast key does not work.
2. Improper LCD contrast.
Check the slide volume and slide key.
Replace the LCD unit.
4 line LCD 4 line LCD
1. LCD contrast key does not work.
2. Improper LCD control PCB. Check the slide volume and slide key.
Replace the LCD control PCB.
20. The wrong pattern
1 line LCD 1 line LCD
name appears on
the LCD.
1. Disconnection of connector CN2 on
LCD unit.
2. Inferior LCD unit or pattern sensor.
Connect CN2 on LCD unit.
Replace the LCD unit or pattern sensor.
4 line LCD 4 line LCD
1. Disconnection of connector P3 on LCD
control PCB.
2. Inferior LCD control PCB or pattern
sensor.
Connect P3 on LCD control PCB.
Replace the LCD control PCB or pattern
sensor.