Ricoh FT5535 Service Manual page 104

4. TEST POINTS (MAIN CONTROL BOARD)
Number
TP1
TP2
TP3
TP4
TP5
TP6
TP7
TP8
TP9 (P-SENSOR)
TP11
TP12
TP13
TP14
TP15
TP16
TP17
TP18
TP19
TP20
TP21
FSM
Label
(RXB) RXB
(TXB) TXB
(TXA) TXA
(TXS) TXS
(RXS) RXS
(GND) Ground
(+5 V) +5 V
(TXL) TXL
ID sensor output
(TRANS-FB) Transfer current feed-back voltage
(LAMP) Exposure lamp voltage feed-back voltage
(T-SENSOR) Toner density sensor output
(ADS) Auto image density sensor output
(RXA) RXA
(CHA-FB) Drum charge roller feed-back voltage
(DEV-BIAS) Development bias feed-back voltage
— Drum charge thermistor output
— Not used
— Secondary fusing thermistor output
— Main fusing thermistor output
4-53
Monitored Signal
FT5535/4527/4522