Target-yield control is not just a number on the remote. It depends on the C3 dosing PCBA, the Bluetooth scale, and the Micra paddle action staying in the same workflow. Once the scale icon and target yield are understood, most stop-weight differences become easier to diagnose.
1. What the Bluetooth Scale Icon Means
The scale icon indicates whether C3 is receiving live weight data. Target-yield stopping, shot curves, and final cup-weight review are meaningful only when the scale connection is stable.
| Symptom | First Check |
|---|---|
| No scale icon or abnormal state | Confirm the scale is powered, charged, and not connected to a phone app or another device. |
| The phone can see the scale, but IRIS4 cannot | Close the phone app connection, restart the scale, and let C3 scan again. |
| The curve has weight data but the cup ends heavy | Compare stop-time weight with final settled cup weight; dripping after stop can add grams. |
2. Setting a More Stable Target Yield
- Open the shot-dosing page on the remote.
- Tap the left or right half of the screen to adjust target yield.
- Long-press the page for about three seconds if scale settings need manual attention.
- Record two or three shots, including stop-time weight and final settled cup weight, before fine-tuning the target.
3. BOOKOO and Acaia Scale Habits
BOOKOO Two-Point Mode
Fast for daily use, but early drops and timer behavior should be checked if stop timing looks unstable.
BOOKOO Three-Point Mode
Often steadier, but may require waiting for the auto-zero flow to settle before moving the paddle.
Acaia or Other Scales
First confirm the official app is not holding the Bluetooth connection, then check whether C3 keeps receiving live weight.
4. Key Actions During One Shot
Keep the scale surface dry, place the cup steadily, and avoid touching the scale during auto-tare and early timing. After the shot stops, wait about three seconds before removing the cup so the final value can settle and be compared with the stop value.
5. When to Read the Full Manual
If you are still unsure about the icon meaning, C3 state, curve page, or 50-second protection logic, open the target-yield section of the online manual. If wiring or installation is suspected, read the PCBA Non-Destructive Installation Guide first.