Service Tables; Test Points - Ricoh FT7770 Service Manual

SERVICE TABLES

1. Test Points

- Main Board -
Number
Function
TP201 Trigger for P.P. (PCC)
TP202 Trigger for P.P. (PTC)
TP203 T r i g g e r f o r P . P . ( T 2 )
T r i g g e r f o r P . P . ( S 2 )
TP204
TP205 R e f e r e n c e clock pulse to main motor board
Reference clock pulse to scanner motor
TP206
board
R e s e t p u l s e
TP207
TP208
R e s e t P u l s e
TP209
Clock pulse
TP210
ADS voltage (Adjust
TP211
T r i g g e r f o r P . P . ( C )
TP212
Trigger for P.P. ( T 1 )
TP213
T r i g g e r f o r P . P . ( S 1 )
+24V
TP214
TP215
GND
TP216 +15V
+5V
TP217
TP218 +1.31 to 1 . 3 5 V threshold voltage of IC219
(Adjust using VR202.)
TP219 Trigger for P.P. (PQC)
TP220 I n p u t v o l t a g e o f i m a g e d e n s i t y s e n s o r
(Adjust using VR203.)
- Scanner Motor Control Board -
Number Function
Scanner ON signal from Main Board
TP501
TP502 Factory Adjustment Use
TP503 +4V (Forward): -6V (Reverse)
Factory Inspection Use
TP504
TP505 Factory Adjustment Use
Factory Adjustment Use
TP506
TP507 Ground (GND)
Factory Adjustment Use
TP508
- Main Motor Control Board -
Number Function
GND
TP301
TP302 Encoder Pulse Reference (+0.77V)
using VR201)
4-11
30 '89
April,