Brother GTX-4 Service Manual page 275

(9) Insert a round-shaped rod (such as screwdriver) to the valve base hole. (φ6, approx. 9.84 in. [25 cm] long)
(10) Disconnect the connectors from the circuit board and detach the harness from the cord clamp.
(11) Disconnect the connector connected to the motor.
(12) Disconnect the four connectors connected to the sub tank.
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Disassembly / Replacement / Adjustment
6-84
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