13-6
6864110R66-O
March, 2001
Troubleshooting
CDR500 & CDR700 Repeater Service Manual
3.
Transmit radio keying continu-
ously or keying without a prop-
erly identified signal presented
to receive radio.
3a. Pin 3 of “J4-ACC” pulled LOW
by an accessory.
3b. If using VOX in receive radio, ac-
cessory connector “Rx Audio
Type” programmed for “Flat
Audio”.
3c. Pin 3 of accessory connector of
transmit radio programmed ac-
tive level “High”.
3a. Remove accessory and correct
LOW condition.
3b. Reprogram “Rx Audio Type” for
“Filtered Audio”.
3c. Reprogram pin 3 of transmit ra-
dio for active level “Low”.
4.
First part of message not repeat-
ed.
4a. User speaking too soon after
pressing PTT.
4b. If using VOX:
• User speaking too softly.
• Inadequate handset audio
level from receive radio.
4a. Delay conversation to allow for
delays in repeater and field radi-
os from:
• TPL/DPL decoding.
• Requirements of signalling
systems.
4b. Educate users to hold micro-
phone closer to mouth, or speak
more loudly into it.
• Verify low handset audio out-
put from the receive radio and
repair.
5.
Transmit radio keys but low or
no audio is transmitted.
5a. S2-5 or S2-6 of controller not
turned ON.
5b. R23 of controller not adjusted
correctly.
5c. “Accessory Mic Gain” of trans-
mit radio set too low.
5d. “Ext PTT Audio” source incor-
rect.
5a. Turn S2-5 ON for flat transmit
audio; turn S2-6 ON for EIA mi-
crophone audio.
5b. Adjust R23.
5c. Reset “Accessory Mic Gain” of
transmit radio.
5d. 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).
6.
“Tinny” repeated audio (lacks
low frequencies).
6.
“Flat” receive audio selected
with “Ext Mic” transmit audio.
6.
Check positions of:
• S2-5 (ON)
• S2-6 (OFF)
7.
“Bassy” repeated audio (lacks
high frequencies).
7.
“Filtered” receive audio selected
with “Flat” transmit audio.
7.
Check positions of:
• S2-5 (OFF)
• S2-6 (ON)
8.
TPL/DPL signalling “passing
through” controller.
8.
“Flat” receive audio selected.
8.
Check positions of:
• S2-5 (ON)
• S2-6 (OFF)
9.
TPL/DPL signalling not “passing
through” controller.
9.
“Filtered” receive audio selected. 9.
Check positions of:
• S2-5 (OFF)
• S2-6 (ON)
10. DPL sense inverted in “pass
through” mode (flat audios).
10. Inversion caused by processing
of signal in receive radio circuits.
10. Add unity gain inverting ampli-
fier in audio path (either receive
radio audio output or transmit
radio audio input). This amplifi-
er is not available from
Motorola.
or
Reprogram field radios for “INV
DPL” Receiver SQUELCH
Mode.
Table 13-4.
Troubleshooting for Basic Repeater Controller (Cont'd.)
Symptom
Problem
Solution
Summary of Contents for CDR500
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