Very usefull manual. From my point of view there are needs more clearables images.
Text excerpt from page 37 (click to view)
6.5 Testing on HP8922
HP8922 GSM Test Set 83220E Down Converter RF Cable PSU Cable
M3682 under Test
Note: To test the PCB on its own without a housing or SIM card the unit must first be put into test mode and then into Tx or Rx mode using the applicable manual test commands. Ensure that a battery is installed during this, since the battery acts as a SIM card presence detect for the unit. The PCB can then be taken out of the housing for any analysis.