Brother International BAS-311E Network Users Manual - English - Page 115

Power PCB defective., Pins 2 and 10 air valve for left work clamp

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Chapter 7 Error status Probable causes 4. Power PCB defective. Check/repair/adjust Parts to be replaced • Measure the resistance between a terminal in the center of the power PCB and pin 2 in connector P5 (DC300). The resistance should be ∞Ω. Power PCB • Remove connector P12 (POWER) on the control circuit board, turn on the power, and measure the voltage across pins 4 and 6, pins 5 and 6, pins 5 and 7 on the cord. The voltage in each case should be +55V. Measure the voltage across pins 2 and 3. The voltage should be +20V to 24V. After measurement, turn off the power, wait at least 5 minutes, and insert P12. #4 The work clamp does not move up and down when the foot switch is stepped on. Work clamp for pneumatic specification (BAS-311E and 325E) 5. The air valve is defective. • Pull out connector P4 (AIR) on the control circuit board and measure the resistance between the following pins in the connector on the cord: Pins 1 and 10 (air valve for right work clamp) Pins 2 and 10 (air valve for left work clamp) Pins 3 and 10 (air valve for presser foot; only for optional specification) The resistance in each case should be 300 - 400 Ω. Air valve Valve harness assy. 6. The control circuit board (#3) is defective. • Pull out connector P4 (AIR) and measure the voltage across the following pins in the connector on the PCB: Pins 1 and 10 (air valve for right work clamp) Pins 2 and 10 (air valve for left work clamp) Pins 3 and 10 (air valve for presser foot; only for optional specification) The voltage in each case should be +20V to 24V. After measurement, turn off the power, wait at least 5 minutes, and insert P4. Control circuit board. BAS-311E.311EL.326E.326EL 107

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107
BAS-311E.311EL.326E.326EL
Chapter 7
#4
The work
clamp does
not move
up and
down
when the
foot switch
is stepped
on.
Probable causes
4.
Power PCB defective.
5.
The air valve is defective.
6.
The control circuit board (#3) is
defective.
Check/repair/adjust
• Measure the resistance between a terminal in the
center of the power PCB and pin 2 in connector P5
(DC300).
The resistance should be
∞Ω.
• Remove connector P12 (POWER) on the control
circuit board, turn on the power, and measure the
voltage across pins 4 and 6, pins 5 and 6, pins 5
and 7 on the cord.
The voltage in each case should be +55V.
Measure the voltage across pins 2 and 3.
The
voltage should be +20V to 24V.
After measurement, turn off the power, wait at
least 5 minutes, and insert P12.
• Pull out connector P4 (AIR) on the control circuit
board and measure the resistance between the
following pins in the connector on the cord:
Pins 1 and 10 (air valve for right work clamp)
Pins 2 and 10 (air valve for left work clamp)
Pins 3 and 10 (air valve for presser foot; only
for optional specification)
The resistance in each case should be 300 - 400
Ω.
• Pull out connector P4 (AIR) and measure the
voltage across the following pins in the connector
on the PCB:
Pins 1 and 10 (air valve for right work clamp)
Pins 2 and 10 (air valve for left work clamp)
Pins 3 and 10 (air valve for presser foot; only
for optional specification)
The voltage in each case should be +20V to 24V.
After measurement, turn off the power, wait at
least 5 minutes, and insert P4.
Parts to be replaced
Power PCB
Air valve
Valve harness assy.
Control circuit
board.
Error status
Work clamp for pneumatic specification (BAS-311E and 325E)