Brother GTX-4 - Page 330

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Disassembly / Replacement / Adjustment
Power circuit board (SB4721)
Power indicator lamp (constantly ON)
* LD4 and LD5 signifies condition of standby power source, and remains on when main power is switched off with the
power switch and when power is cut by opening front cover.
LD1
A
DD5V
LD2
+31.5V
LD3
+5V
LD4
+5V_SW
LD
5
+6.5V-23V
LD
6
+24V
LD7
+36V
LD8
POWER ON
F8,F9
PRIMARY FUSE
HARNESS
NOISE FILTER
HARNESS
FILTER GND WIRE
CN15
COIL_IN
CN14
SW_CTL
CN13
PW_SW
CN4
DC_IN
CN3
MAIN_UART
CN2
MNT
CN1
POWER1
CN5
POWER2
CN6
POWER3
CN18
COVER_SW
CN17
COIL_OUT
HARNESS
AC_POWER