Ricoh Aficio FX10 Service Manual page 78

June 10th, 1997
3. DRAM
•
1024 kB DRAM shared between the Line Buffer (32 kB), ECM Buffer
(64 kB or 128 kB), Page Memory (3 MB), and SAF memory (576 kB).
•
Backed up by the battery on the FCU (not available in US).
4. SRAM
•
32 kB SRAM for system and user parameter storage.
•
Backed up by the battery on the FCU.
5. Video SRAM
•
32 kB SRAM for video processing.
6. Oscillators
•
29.952 MHz oscillator for system clock generation.
•
32.768 kHz oscillator for the real time clock. This is backed up by the
battery on the FCU.
•
38.00053 MHz oscillator for the modem clock.
•
23.9616 MHz and 26.9568 MHz for the printer control clock.
7. EXIO (External I/O)
•
Serial interface to the OPU.
•
Parallel interface to the main motor, clutches, and sensors.
8. HIC (Hybrid IC)
•
2-4 wire switching
•
Filters and amplifiers
•
Monitor speaker driver
9. DC/DC Converters
•
+5V generation
•
- 5V generation
10. Interlock Switches
•
The fusing unit interlock switch (+24V) disables the power supply to the
drive components and the power pack.
•
The fusing unit interlock switch (+5V) disables the power supply to the
laser diode unit.
DETAILED SECTION DESCRIPTIONS
2-49
PCBs