Motorola CP040

3-8 TROUBLESHOOTING TABLES
U201
Freq Synthesizer
24 Ref osc XTAL2 0
25 Ref osc warp output 3.00
26 Superfilter cap 4.48
27 Superfilter base (NU) 3.76
28 Superfilter output 4.52
29 NC2 0
30 Superfilter input 4.96
31 NC3 0
32 Prescaler input 1.97
33 Prescaler ground GND
34 Prescaler Vdd 2.99
35 Prescaler Vref (NU) 1.97
36 Digital Vdd 2.99
37 TEST1 (NU) 0.01
38 TEST2 (NU) 0
39 Bias 2 3.38 (typ) (1.34V in TX mode)
40 Bias 1 1.50 (typ) (3.20V in TX mode)
41 Modulation output 3.42 (typ) (1.62V typ in TX mode)
42 CCOMP (NU) 0.05
43 Steering line IOUT 9.62 (typ) Depends on frequency
44 PD ground GND
45 Steering line IADAPT 9.62 (typ) Depends on frequency
46 Adapt switch (NU) 0
47 Voltage from charge pump 12.8
48 AUX1 output (NU) 2.98
U251
VCO / Buffer
1 TX VCO current adjust 4.50
2 RX VCO current adjust 4.35
3 Superfiltered input 4.51
4 Collector RF in amp 4.35
5 RX VCO base 1.27
6 RX VCO emitter 0.48
7 RX switch output (NU) 0
8 RX buffered VCO output 3.36
9GND_FLAG GND
10 TX buffered VCO output 3.36
11 GND_BUFFERS GND
IC Designator Pin Pin Function DC Voltage Comments (Condition)