Multitone RPR 551IS, Technical Manual

Page: 89 / 127

BEC
RPR 550IS Series
TM1188 Issue 1 Page 5 - 19
Table 5: Decoder Circuit Detailed Test Sequence
STEP TEST POINT REMARKS
1 C1 B+ 1.3V DC
2 IC2 pins 31,71 V
DD
2.7 - 3.3V DC
3 IC3 pin 39 V
DD
2.7 - 3.3V DC
4 IC2 pins 10,51 V
DD
1 1.5V
5 IC2 pin 3 XL3 Gate array clock crystal 32.768kHz
6 IC2 pin 5 RESB 0 - 3V on switch on
7 IC3 pin 33 P13 Interrupt 140µS pulse
8 IC2 pin 68 TMI 100µs every 2s
9 IC2 pin 67 SWI Switch activity
10 IC3 pin 22 XL4 µP clock crystal 1MHz (8.4ms every 1/8s)
11 IC2 pin 26 E Transfers data
12 IC2 pin 9 0 enables radio
13 IC2 pin 42 (R92) TSF Display `On' icon
NOTE: = falling edge of output signal. Measurements are made with a x10 oscilloscope
probe.