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4-30
Table 4-17. Standard Operating Bias: Clock and Control Lines (Continued)
Nominal Value
Note: Use chassis as GND when measuring on an oscilloscope.
Approx. 0 V
1.88 V
Approx. 0 V
2.85 V
(See
"Chapter 6
Troubleshooting
Waveforms" on
page
6-1)
2.85 V
0 V
(See
"6.2.5
32 kHz Clock
Waveform" on
page
6-4)
(See
"6.2.4
16.8 MHz Clock
Waveform" on
page
6-3)
Note: Do not KEY UP unless the board is inside a chassis.
Nominal Value
9.2 V
9.2 V
13 V to 16 V
Note: Do not press the PTT unless the PCB is inside a chassis even for a moment to check a line.
Permanent RF hardware damage can occur to the board due to no heatsinking.
June 15, 2005
Signal Name
RS232__UARTA_RTS
Emergency
Emergency
Emergency_sense
Emergency_sense
SAP_TX
SAP_RX
SAP_DCLK
SAP_FSYNC
32 kHz
16.8 Mhz
Table 4-18. Standard Operating Bias: Audio Lines
Signal Name
Mic_Hi
Mic_Hi
Mic_Hi
Troubleshooting Procedures: Standard Bias Tables
Range/State
Flow control line—not
used always
Idle = deactivated =
grounded
Activated = ungrounded
Deactivated
Activated
Idle = Radio ON
Idle = Radio ON
Idle = Radio ON
Idle = Radio ON
Range/State
When microphone
connected (expects
80 mV input) (line has
microphone bias)
When microphone
disconnected
When programming
cable inserted
Probe Locations
TP0410, J2-10
J2-15, J0402-28,
TP0403
J2-15, J0402-28,
TP0403
U508-4
U508-4
J0401-35
J0401-36
U0401-37
U0401-38
U0102-4
C0911 near U0903
Probe Locations
TP0402, J0401-4
TP0402, J0401-4
TP0402, J0401-4
6815854H01-A
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Troubleshooting
