Variable Resistors And Capacitors; Switches; Led Indicators - Ricoh FAX7000L Field Service Manual

4-2-2. Variable Resistors and Capacitors

1. SCU
VR1 - Buzzer volume control
2. MBU
VC1 - Real time clock drive frequency adjustment
3. SBU
VR1 - White level adjustment
4. G3CCU
VR1 - Not used
VR2 - Not used
5. G3NCU
VR1, 2 - Do not touch
VR3 - Tx level adjustment (range = 4 dB)
6. Power Pack
All controls - Do not touch
7. LDDR
VR1 - Do not touch

4-2-3. Switches

1. MBU
SW1 - Battery switch
2. DSB
SW1 - Scanner cover switch
3. G3CCU
SW1 - Not used

4-2-4. LED Indicators

1. SPU
LED 1 - Factory use only
LED 2 - On = VPU FIFO reset
LED 3 - Copy feed-out sensor; Off = Paper
present, On = No paper
LED 4 - Registration sensor; Off = Paper
present, On = No paper
LED 5 - On = Upper paper feed clutch on,
Off = Upper paper feed clutch off
LED 6 - On = Registration clutch on,
Off = Registration clutch off
LED 7 - On = Transfer corona unit off,
Off = Transfer corona unit on
LED 8 - On = Charge corona unit off,
Off = Charge corona unit on
LEDs 2 to 8 light up cyclically if there is an Auto
Service Call condition.
2. UIB
LED 1 - On: Upper unit CPU running
LED 2 - On: + 12V supply is present at the LDDR
LED 3 - On: Pentagonal mirror motor is running
4-5