Ricoh FT7770 Service Manual page 48

9. Printed Circuit Boards
AC Drive (PCB-4)
CPU (PCB-13)
DC/AC Inverter (PCB-6) 12
Development Motor
(PCB-8)
Key (PCB-14)
Lamp Regulator (PCB-17) 103
Left LCD (PCB-15)
Lens/Mirror Motor
Control (PCB-7)
Lower Paper Size
(PCB-11)
Main (PCB-1)
Main Motor Control
(PCB-5)
Monitor (PCB-9)
DC Drive (PCB-3)
Right LCD (PCB-16)
ROM (PCB-12)
Scanner Motor Control 97
(PCB-2)
Upper Paper Size
(PCB-10)
10. Relays
AC Power (RA-102)
Cleaning Trigger
(RA-701)
Fusing Lamp (SSR-12)
Fusing Lamp (SSR-13)
Fusing Power (RA-101)
Rush Current (RA-108)
Tray Heater (RA-106)
Right Door Safety
(RA-110)
37 Controls several ac motors with SSRs.
3
Controls all the operation panel PCBs.
Provides power for the LCD display.
122 Controls the speed of the development
motor.
9
Receives operator key input.
Regulates the exposure lamp voltage.
7
Controls the left LCD display.
104
Controls the lens/mirror drive motor.
73 Informs the CPU of the paper size.
111 Controls overall machine operation.
36 Controls the speed of the main motor.
57 Displays the locations of misfeeds.
114 Drives +24-volt components.
10 Controls the right LCD display.
4 Holds the ROMs which contain the LCD
display data.
Controls the speed of the scanner motor.
84 Informs the CPU of the paper size.
120 Main power relay.
to motors and circuits.
121 Provides +40 volts initial power to the
cleaning solenoid when it is turned on.
129 Provides power to the 1,100 W fusing lamp.
128 Provides power to the 550 W fusing lamp.
115 Provides 100 volts ac to the fusing lamps.
116 220/240volt machines only. Prevents
damage to the circuit at power on.
127 When this relay de-energizes 100 volts ac
is provided to the tray heaters.
113 Opens when the right door safety switch
opens. Cuts 100-volt ac power.
1-31
30 April, '89
Provides 100 volts ac