Troubleshooting For Repeater Transmit Radio - Motorola CDR500 Programming Manual

Troubleshooting
Table 13-3. Troubleshooting for Repeater Transmit Radio (Cont'd.)
Symptom
3. Low or erratic output power lev-
el, or no output power level
from transmit radio.
4. Transmit radio keys but low or
no audio is transmitted.
5. No speaker audio heard from
transmit radio in bi-directional
repeater configuration.
13-4
Problem
3a. Loose RF cable connector(s).
3b. Faulty antenna or feedline.
3c. Faulty duplexer (if applicable).
3d. Output voltage from power sup-
ply drops during transmit.
3e. Excessive power supply current
drain.
4a. Loose or bad repeater cable(s).
4b. "Accessory Mic Gain" set too
low.
4c. Transmit radio audio loaded
down due to connections to ac-
cessory connector of controller.
4d. Receive radio audio loaded
down due to connections to ac-
cessory connector of controller.
4e. "Ext PTT Audio" source incor-
rect.
5a. Volume control of transmit radio
turned down.
5b. Speaker not connected in control
head.
5c. External speaker (if applicable)
not connected between pin-1
and pin-16 of accessory connec-
tor of transmit radio.
5d. Defective speaker (internal or
external, if applicable).
6864110R66-O
CDR500 & CDR700 Repeater Service Manual
Solution
3a. Tighten RF cable connectors to
• radios
• duplexer
• antenna
3b. Replace faulty component.
3c. Check:
• Tuning of duplexer
• Tightness of locking nuts on
tuning screws.
Replace duplexer if duplexer is
correctly tuned and nuts are
properly tightened.
3d. Check:
• Correct position of "115/230"
switch on power supply.
• Output power of transmit
radio; do not set greater than
10% over rated RF output
power (measured at radio,
NOT at duplexer antenna con-
nector).
3e. Disconnect components, one at a
time, to locate faulty piece. Re-
place faulty piece.
• If Lowband radio, reduce out-
put power to 40 Watts or less.
4a. Check repeater cable connec-
tion(s) and replace cable, if nec-
essary.
4b. Reprogram "Accessory Mic
Gain".
4c. Remove accessory and correct.
4d. Remove accessory and correct.
4e. Select and reprogram transmit
radio "Ext PTT Audio":
• "Ext Mic Audio" for EIA mic
audio only (pin 2).
• "Flat Tx Audio" for flat audio
only (pin 5).
• "Ext Mic & Flat Tx" for both
audios (pin 2 and 5).
5a. Turn volume up.
5b. Check speaker connections in
control head.
5c. Remove repeater cable wires
from pin-1 and pin-16 of acces-
sory connector of transmit radio.
Plug in external speaker wires.
5d. Replace speaker.
March, 2001