Motorola APX 1000 Detailed Service Manual page 792

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RX RF Failure – Page 7

Remove SH10 and SH4.

Measure RF and IF level at mixer

and compute mixer conversion

For VHF radios:

Input of L328 and output of L503.

For UHF1/UHF2 radios:

Non gnd of C1900 and output of

For 7/800 radios:

Input of C488 and output of L503.

Mixer gain about

Note: RF Test frequency used:

UHF1: 424.975MHz

UHF2: 485.075MHz

Measured with a High Frequency Probe for relative comparisons and troubleshooting

only. Actual S21 gain or loss may differ if the test point is not 50 ohms.

Troubleshooting Charts: RX RF Failure

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