Digital Section; Accessing Different Modes; Ate Mode; Rf Band Resistors - Shure SLX2 Service Manual

DIGITAL SECTION

Test Frequencies (MHz)
SLX2 Low
Center
High
25A1090 (Rev.3)

ACCESSING DIFFERENT MODES

ATE MODE

If TP_PB0 is held to TP_EGND, or logic level 0, at startup, the microcontroller will enter ATE
Mode. To ensure proper operation, TP_PA0 and TP_PA1 should be held to TP_EGND at startup.
In ATE Mode, each band has a three test frequencies that are controlled by the logic levels at
test points TP_PA0 and TP_PA1.
H5 J3
518.400 572.400
529.500 583.500
541.800 595.800

RF BAND RESISTORS

Two resistors (R and R
A
termine the voltage at test point TP_RFBAND.
This table shows R 's and R
A
reflect the operating RF band.
This figure depicts the voltage divider feeding the microprocessor analog to digital converter.
.
Frequency TP_PA0
Low 0
Center 0
High 1
JB L4
806.125 638.400
807.500 649.500
809.750 661.800
) are responsible to start the microcontroller in a RF band. They de-
B
's reference designators and how the voltages at the test points
B
SLX Reference Designators
SLX2
R
A
R319
7
TP_PA1
0
1
1
P4 Q4
702.100 740.125 800.525
714.000 746.325 810.275
725.900 751.875 819.800
R
B
R320
R5 S6
838.100
851.300
864.800