General Service Tables; Test Points - Ricoh FAX7000L Field Service Manual

4-2. General Service Tables

4-2-1. Test Points

1. SCU
TP1 - Drive clock (8 MHz): system, main cpu
TP2 - Drive clock (3.072 MHz): buzzer timer, bar
code reader
TP3 - + 5V
TP4 - COM1 (Ground)
2. SPU
TP1 - COM1 (Ground)
TP2 - Drive clock (8 MHz): SPU system, ADCR1
(VPU), hard disk controller
TP3 - Slave cpu drive clock (16 MHz)
TP4 - COM1 (Ground)
TP5 - Data for printing (to the laser diode)
TP6 - Transfer clock (4.0748 MHz) for
printed data
TP7 - + 5V
3. MBU
TP1 - Drive clock (32.768 kHz): Real time clock
TP2 - Used when adjusting VC1
TP3 - COM1 (Ground)
TP4 - + 5V
4. UIB
TP1 - Laser main scan start sync signal,
from LSD
TP2 - COM1 (Ground)
TP3 - Laser power feedback signal (XLPDET,
from LDDR)
TP4 - + 5V
COM1 - Ground
5. LIB
TP1 - COM1 (Ground)
TP2 - COM3 (Ground)
6. DSB
TP1 - + 5V
TP2 - COM1 (Ground)
7. DRU
TP1 - COM1 (Ground)
TP2 - + 5V
8. VPU
TP1 - COM2 (Ground)
TP2 - Video signal output
TP3 - COM1 (Ground)
9. SBU
VIDEO - Video signal (XVIDEO)
SH - CCD drive clock (main scan start sync)
COM2 - Ground
GND - Ground
4-3