Brother International DCP 8040 Service Manual - Page 63
EEPROM, Reset circuit, 3.10 Engine I/O, 3.11 Panel I/O
UPC - 012502610328
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MFC-8440/8840D/8840DN, DCP-8040/8045D/8045DN SERVICE MANUAL 1.3.8 EEPROM The EEPROM is BR24126 type of two-wire method with a 8192 x 8bit configuration. U15 Aurora Fig. 3-10 1.3.9 Reset circuit The reset IC is a R3112N281C. The reset voltage is 2.8V (typ.) and the LOW period of reset is 22.4ms (typ.) VDD3 C71 C75 U5 5 CD C103 4 TP310 NC C103 2 VCC 3 1 0V GND VOUT R3112N281C TP4 R84 68 C77 0V C101 Fig. 3-11 1.3.10 Engine I/O The interface with the engine PCB is by full-duplex synchronous serial method, of which transfer rate is 520kbps. U7 ENGDI 3D 254 ENGDI 253 ENGRSTN 255 ENGDO Aurora TP200 TP201 VDD3 R142 1k R138 100 ENGDI 1D VDD5 TP202 TP203 TP204 R141 100 R139 4.7k VDD3 L10 L14 L12 TP205 L13 L15 ENGINE CN9 0 1 3.3V 0 5 RESET 0 3 TXD 0 4 RXD 0 6 5V C143 C102 R140 4.7k C154 C103 C103 C101 C101 C152 C153 C142 0V Fig. 3-12 L11 0 2 0V B6B-PH-K-S 1.3.11 Panel I/O The interface with the panel PCB is by full-duplex synchronous serial method. Fig. 3-13 3-7