Replacement Board Procedures; Transmitter Troubleshooting; Table 7-1. Transmitter Troubleshooting Chart - Motorola PM1200 Basic Service Manual

7-2
7.3

Replacement Board Procedures

Once a problem has been isolated to a specific board, use one of the following recommended repair
procedures:
• Install a good board from your inventory into the radio.
• Order a replacement board from Radio Products Services Division. Refer to
Replacement Parts Ordering" on page A-1
7.4

Transmitter Troubleshooting

Table 7-1 can help troubleshoot problems that might occur in the transmitter section of the radio.
Symptom
No RF Power
Output
Distorted
Modulation
No Modulation,
Bad
Microphone
Sensitivity
No/Low
Signaling (PL,
DPL, Trunking,
MDC)
October 26, 2007

Table 7-1. Transmitter Troubleshooting Chart

Possible Cause
Microphone
Power current capacity
Frequency Setting
Microphone
Check Programming
Basic Troubleshooting: Replacement Board Procedures
for further information.
Correction or Test (Measurements Taken at
Room Temperature)
Is the PTT switch being pressed correctly?
If yes, there is a possibility that there is no contact
inside the microphone.
Check whether there is a drop in supplied voltage.
Check to ensure the correct channel/ frequency is
selected.
Speak loudly into the microphone while monitoring
the microphone line (pin 5 of J3402 in dash
configuration).
If the voltage of pin 5 of J3402 is not greater than
80 mVrms, then check the microphone.
Reprogram the codeplug using CPS.
"Appendix A
6880309U09-A