Ricoh FT5535 - Page 104

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