Gestetner B130 Service Manual page 268

BLOCK DIAGRAM: PCBS AND COMPONENTS (B044/B045/B046)
Reset/Backup Circuit
Monitors +5VE power, and issues system reset and RTC reset signals. When
the main power is off, supplies power from the primary battery to SRAM and
parts of the SPC2.
SAF Backup
Backs up DRAM for up to 12 hours if power outage occurs while SAF data is
being held. (Included only on B046.)
Analog Processing Circuit
Implements modem filtering, 2/4-line switching, and RITONE switching.
(Included only on B046.)
Modem
Implements a V34 modem and code. Includes a 24.6MHz modem clock.
(Included only on B046.)
Speaker Driver
Drives the speaker for the buzzer and monitor sounds. (Included only on B046.)
Heater Control
Processes signals from the thermistor controlling the fusing heater.
Video Processing Circuit
Interface with the SBU.
Power Pack Control
Interface with the high-voltage power supply unit. (Implements PWM control
and receives feedback.)
Scanner Driver
Drives the scanner and ADF motors and xenon lamp, interfaces with the HP
sensor and the ADF.
Plotter Driver
• Drives the main and polygon motors; the feed, bypass, registration, and
toner-supply clutches; the quenching lamp; and the fan.
SM
CÓPIA NÃO CONTROLADA
6-11
CÓPIA NÃO CONTROLADA
B129 Series/B044 Series