Standard Bias Table; Table 5-1. Standard Operating Bias - Motorola XTS 2500 Service Manual

5-2
In most situations, the problem circuit may be identified using a multimeter, RF millivoltmeter,
oscilloscope (preferably with 100 MHz bandwidth or more), and a spectrum analyzer.
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a u t i o n
5.4

Standard Bias Table

Table 5-1 outlines some standard supply voltages and system clocks that should be present under
normal operation. These should be checked as a first step to any troubleshooting procedure.
Signal Name
Gated_32_KHZ
CKIH
16.8MHZ
POR
MAKO_RESET
VSW1
VSW2
V2.9
UNSW_B+
SW_B+
VCC5
VSAVE
RFSW_B+
February 14, 2012
When checking a transistor or module, either in or
out of circuit, do not use an ohmmeter having more
than 1.5 volts dc appearing across the test leads, or
use an ohms scale of less than x100.

Table 5-1. Standard Operating Bias

Nominal Value
32.768kHz
16.8MHz
16.8MHz
2.9V dc
1.9V dc
3.6V dc
2.3V dc
2.9V dc
7.5V dc
7.5V dc
5V dc
2.5V dc
7.5V dc
Troubleshooting Procedures: Standard Bias Table
Tolerance Probe Point
±400ppm C742
C726
C726
±5% D511, pin 2
±5% D511, pin 2
±5% R711
±5% C715
±5% L704
6-9 V dc R725
6-9 V dc R708
±5% L705
±5% C704
6-9 V dc C730
6816985H01-F