Motorola Mototrbo - Page 160

1-2 Troubleshooting Flow Chart for Receiver
1.1 Troubleshooting Flow Chart for Receiver (Sheet 2 of 3)
With a DMM probe R0503
Voltage
>0.9V and
<1.1V ?
With a high impedance RF
probe measure the RF
level of the IF (44.85 MHz)
@ E0000
With a high impedance RF
probe measure the RF
level of 2nd L.O.
(89.7 MHz) @ TP0010M2
With a high impedance RF
probe measure the RF
level of the IF (44.85 MHz)
@ C0500
Check circuitry around
FL0500 and the entire
shielded block for opens
and shorts before
replacing the part
With a high
impedance RF probe
measure the RF level
(155.1 MHz) @ C0456
Check circuitry around
T0400, T0401, and D0404
for opens and shorts
Check for opens and
shorts on L0417
R0424, R0425, and R0426
No
No
No
No
No
Yes
Yes
No
No
Yes
Yes
Yes
Yes
B
Yes
Yes
No
> -40 dBm?
> +16 dBm?
> +8 dBm?
Refer to the
VCO section
With a high
impedance RF probe
measure the RF level
(155.1 MHz) @ C0457
Check circuitry around
Q0405 and supporting
components for opens and
shorts before replacing
> -50 dBm?
> -38 dBm?
> -38 dBm?
> -10 dBm?
Refer to Audio Trouble-
shooting chart
Check circuitry around
U0500 and the entire
shielded block for opens
and shorts before
replacing the part
With a high impedance RF probe measure the
RF level of the 1st L.O.
(199.95 MHz) @ C0449
NOTE: Use x10 attenuator attenuator to
prevent overload of high impedance probe.
With a high impedance RF
probe measure the RF level of
the 1st L.O. (199.95 MHz) @
C0401
A