Motorola Commercial Series Service Information - Page 23

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Motorola Commercial Series Service Information
Troubleshooting Table for Board and IC Signals
IC Designator
U110
RF Power Amp
U150
Dual Opamp
U201
Freq Synthesizer
Pin
Pin Function
1
RF input
2
Vgg (gate bias)
3
Vdd
4
RF output
5
Ground
1
Unit 1 output
2
Unit 1 (-) input
3
Unit 1 (+) input
4
Ground
5
Unit 2 (+) input
6
Unit 2 (-) input
7
Unit 2 output
8
Vcc
1
AUX2 output (NU)
2
AUX3 output (TRB)
3
AUX4 output (NU)
4
Lock detect output
5
PD Vdd
6
Digital ground
7
Serial data input
8
Serial clock input
9
Synth chip select
10
Modulation input
11
VMULT4 (NU)
12
VMULT3 (NU)
13
VRO
14
VMULT2
15
VMULT1
16
INDMULT (NU)
17
NC1
18
Ref select (NU)
19
Buffered 16.8 MHz out
20
Analog Vdd
21
V bypass (NU)
22
Analog ground
23
Ref osc XTAL1
DC Voltage
Comments (Condition)
0
(TX mode)
4.25V (typ)
(TX mode)
6.59
(TX mode)
--
Do not measure
GND
5.8V (typ)
(TX mode)
2.39 (typ)
(TX mode)
2.39 (typ)
(TX mode)
GND
3.30 (typ)
(TX mode)
3.35 (typ)
(TX mode)
2.23 (typ)
(TX mode)
6.79
(TX mode)
0
0.03
To U251-19 (RX mode)
0
2.98
To U401-56
2.98
GND
3.23
0
3.23
From U401-47
1.50
From U451-40
2.98
0
4.96
1.49
1.49
0
0
0
1.54
3.00
1.55
GND
2.07
3-7