Multitone RPR 551IS - Page 87

RPR 550IS Series
TM1188 Issue 1 Page 5 - 17
Table 4: RPR 550IS Main Board Decoder Circuit DC Voltage Levels
COMPONENT COLLECTOR BASE EMITTER REMARKS
TR1 0 1.27 1.27 Audio power amp
TR2 1.30 0 0 "
TR3 1.17 0.54 1.18 Switched battery
TR4 0 0.02 0 V
DD
2 oscillator
feedback
TR5a 0.73 (4) 0.71 (2) 1.18 (3) V
DD
regulator circuit
TR5b 0.30 (1) 0.73 (5) 1.18 (6) "
TR6 0 - 0 Vibrate drive
TR7 1.21 0 0 V
DD
oscillator
feedback
TR8 0.61 0.43 0 Clock enable (IC2)
TR9 3.00 0 0 IC3 (µP) reset
TR10a 1.27 (4) 1.28 (2) 1.02 (3) Audio pre-amp
TR10b 1.27 (1) 0.62 (5) 1.01 (6) Power amp DC
operating point
TR11a 0 (4) 0.51 (2) 1.08 (3) Data filter gate
TR11b 3.00 (1) 2.46 (5) 3.04 (6) Data filter gate
TR12a - (4) 0.51 (2) 0 (3) Data inverter
TR12b 0.01 (1) 0 (5) 0 (6) Data filter switch
TR13 3.03 1.98 1.51 GB+ gate array
standby supply
TR14a 0 (1) 0.53 (4) 0.07 (5) V
DD
regulation
TR14b 0.08 (2) 0.53 (4) 0 (3) "
TR15a 1.19 (4) 0.03 (2) 0.17 (3) Automatic gain
control
TR15b 0 (1) 0.17 (5) 0 (6) "
TR16 0 1.97 1.17 V
DD
oscillator
TR17 0 3.01 3.03 Alert lamp driver
TR18a 0.06 (4) 0.03 (2) 0 (3) Display module
clock
TR18b 0.69 (1) 0.03 (5) 0 (6) Display module
clock
TR19a 0.81 (4) 1.18 (3) 1.18 (3) V
DD
2 (display)
enable circuit
TR19b 0 (1) 0.81 (5) 1.18 (6) "
TR20 1.30 0 0 L3 (transducer)
driver