Motorola APX 7500 Detailed Service Manual page 122

7-6
A
Apply standard test
signal to receiver
(see note)
Yes
Is O5 control
head present?
No
Check for receive
audio at the rear
panel of the
Consolette. For
example,
EXT_SPKR+/- at
J103 pins 1 and 2.
Is receive
audio present?
Yes
STOP
September 9, 2011
Troubleshooting Charts and Error Codes Troubleshooting Charts
Is the yellow
Busy LED active
on the O5?
No
Check internal RF
cabling of
Consolette and
verify proper RF
Band connected to
proper port. Refer
to model chart and
RF sticker on rear
panel as needed.
Refer to RX Audio
Troubleshooting
No
section. It may be
necessary to replace
the Consolette
Mainboard.
Figure 7-4. Consolette does not Transmit or Receive - B
Note: Standard test signal is an on-channel signal at
-47 dBm (1 mV into 50 Ohms), modulated by a 1 kHz
tone at 60% of the maximum permissible frequency deviation.
Yes
With volume
turned up can 1kHz
tone be heard
at speaker?
Yes
STOP
No
Is the Speaker
Mute button ON?
Yes
Turn Speaker
Mute OFF
68009482001
No