Motorola CDR500 Programming Manual page 90

Troubleshooting
Table 13-4. Troubleshooting for Basic Repeater Controller (Cont'd.)
Symptom
3. Transmit radio keying continu-
ously or keying without a prop-
erly identified signal presented
to receive radio.
4. First part of message not repeat-
ed.
5. Transmit radio keys but low or
no audio is transmitted.
6. "Tinny" repeated audio (lacks
low frequencies).
7. "Bassy" repeated audio (lacks
high frequencies).
8. TPL/DPL signalling "passing
through" controller.
9. TPL/DPL signalling not "passing
through" controller.
10. DPL sense inverted in "pass
through" mode (flat audios).
13-6
Problem
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".
4a. User speaking too soon after
pressing PTT.
4b. If using VOX:
• User speaking too softly.
• Inadequate handset audio
level from receive radio.
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.
6. "Flat" receive audio selected
with "Ext Mic" transmit audio.
7. "Filtered" receive audio selected
with "Flat" transmit audio.
8. "Flat" receive audio selected.
9. "Filtered" receive audio selected. 9.
10. Inversion caused by processing
of signal in receive radio circuits.
6864110R66-O
CDR500 & CDR700 Repeater Service Manual
Solution
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".
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.
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. Check positions of:
• S2-5 (ON)
• S2-6 (OFF)
7. Check positions of:
• S2-5 (OFF)
• S2-6 (ON)
8. Check positions of:
• S2-5 (ON)
• S2-6 (OFF)
Check positions of:
• S2-5 (OFF)
• S2-6 (ON)
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.
March, 2001