Brother International HL-1660E Service Manual - Page 34

1.2 Video Controller Circuit (1) CPU block CPU(#33) MB86832-100 manufactured by Fujitsu RISC chip Clock speed: 19.6608 MHz Appearance: 178-pin QFP Voltage: 3V (2) ASIC/Gate Array Block • #19 MB87F1610(Fujitsu) - 240-pin QFP Controls the address decoder, timers and interfaces (Centronics and RS-232C). • Controls HRC(High Resolution Control), GSC(Gray Scale Control) and economy mode, drivened by 3V. • #3 µPD65632GF - 100-pin QFP Controls the I/O ports and others. (3) Font Cartridge/Card Block • Font cartridge (option) The font cartridge has a 32MB memory area and is controlled by the 16-bit bus. The address bus a buffer LS245 and the data bus, a buffer LCX245. • Font Card (option) The font card has a 32MB memory area and is controlled by the 16-bit bus. The card is supplied with 12V power because the flash card requires 12V power supply when writing or erasing data. The address bus is buffered by LS245 and the data bus, is buffered by LCX245. (4) Centronics/RS-232C interface block • Centronics parallel interface Data transmission and reception are controlled by the MB87F1610 (#19). • RS-232C Data transmission and reception are controlled by the MB87F1610 (#19). The ADM202JRN (#35) serves as driver/receiver. (5) SIMM block • SIMM (Single-Inline-Memory-Module) allows memory extension up to 72MB • 2 SIMM sockets are available. • SIMM should be of 72-pin type and its access time should be less than 70 ns. • 6 types of SIMM (1MB, 2MB, 4MB and 8MB) can be combined: 1MB MH25632BJ-7 (MITSUBISHI), HB56D25632B-7A (HITACHI) 2MB MH51232BJ-7 (MITSUBISHI), HB56D51232B-7A (HITACHI) 4MB MH1M32EJ-7 (MITSUBISHI), HB56A132BT-7A (HITACHI) 8MB MH2M32EJ-7 (MITSUBISHI), HB56A232BT-7A (HITACHI) 1) The SIMMs have its printed marking on the PCB by silk screen: SLOT1 and SLOT2, respectively. The SIMMs should be set in the order of SLOT1 - SLOT3. III - 2