# Starting Operation

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Note: The use of batteries unsuitable for your power tool can lead to malfunctions or damage to the power tool.

Set the rotational direction switch (16) to the middle position to avoid unintentionally switching it on. Insert the charged battery (11) into the handle until you feel it engage and it is flush with the handle.

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The rotational direction switch (16) is used to change the rotational direction of the power tool. However, this is not possible while the on/off switch (17) is being pressed.

| Rotate clockwise: Slide the rotational direction switch (16) on both sides until it stops in the position.
| Rotate anti-clockwise: Slide the rotational direction switch (16) on both sides until it stops in the position.

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| Drilling
Set the mode selector switch (7) to the "drilling" symbol.
| Screwdriving
Set the mode selector switch (7) to the "screwdriving" symbol.
| Impact drilling (GSB 18V-150 C)
Set the mode selector switch (7) to the "impact drilling" symbol.

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To start the power tool, press and hold the on/off switch (17).

The LED (13) lights up when the on/off switch (17) is lightly or fully pressed, meaning that the work area is illuminated in poor lighting conditions.

To switch off the power tool, release the on/off switch (17).

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You can adjust the speed of the power tool when it is on by pressing in the on/off switch (17) to varying extents.

A light pressure on the on/off switch (17) results in a low rotational speed. Increased pressure on the switch causes an increase in speed.

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The torque presetting ring (6) can be used to preselect the required torque in 25 stages. Once the set torque has been reached, the application tool will be stopped.

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- Only operate the gear selector (8) when the power tool is not in use.

First gear:

Low speed range; for working with a large drilling diameter or for screwdriving.

Second gear:

High speed range; for working with a small drilling diameter.

- Always push the gear selector switch as far as it will go. Otherwise, the power tool may become damaged.

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The rapid shut-off function (KickBack Control) gives the user greater control over the power tool and offers them better protection than power tools that do not have KickBack Control. The power tool will switch off if it suddenly and unforeseeably rotates around the drilling axis.

The rapid shut-off is indicated by the LED (22) flashing red, a flashing light from the worklight (13) and the LED of the KickBack Control (23) lighting up red on the power tool.

To switch the tool back on, release the on/off switch and then press it again.

- It will no longer be possible to switch the power tool on if the KickBack Control function is faulty. Have the power tool serviced by a qualified repair person using only original replacement parts.

The rapid shut-off function can be deactivated on the user interface (14) with the button (24). If the power tool is not used for longer than 5 minutes or if the rechargeable battery is removed, the rapid shut-off function automatically switches back on. The current status is shown via the LED for KickBack Control (23) on the user interface (14).

Please note that the warning light is not visible from all directions. The warning light is difficult to see in bright sunlight.

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With electronic angle detection (EAD), a slope angle can be preselected that the power tool detects during work and displays to the user. This means it is possible to drill or screw at right angles in a sloped surface, for example. Electronic angle detection (EAD) is controlled via the user interface (14).

Select an angle (45°, 60°, user-defined) on the user interface (14). Note: The user-defined angle in the factory settings is 90°. This angle can be adjusted via the Bosch app.
To adjust the angle, press the button for the electronic angle detection (EAD) (20) until the LED of the required slope angle (21) starts flashing.

In addition to the LED of the required slope angle (21), the LED of the electronic angle detection (EAD) (9) also starts to flash yellow. Now position the power tool on the required surface and hold it as still as possible. Note: If the power tool is not held still during the initiating process, the initiating process will automatically end after 10 seconds and the last set value is restored.
The power tool will start the initiating process once it is positioned. The required surface is taught in during the initiating process. The initiating process is complete when the LED of the electronic angle detection (EAD) (9) lights up green for approx. 1 second and then goes out, and the LED of the slope angle (21) lights up continuously.

Remove the power tool from the surface. Align the power tool with the taught-in surface in the required slope angle. The LED (22) lights up yellow if the slope angle is approaching the required/preset slope angle.

The LED (9) lights up green when the required/preset slope angle is approximately reached. To end the electronic angle detection (EAD), press the button for the electronic angle detection (EAD) (20) until none of the LEDs for angle selection (21) are lit up (45° → 60° → User-defined → Off). The set angle and reference surface are saved even when changing the rechargeable battery or when waking up the power tool from sleep mode.

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The user interface (14) is used to set and check a slope angle as part of the electronic angle detection (EAD), to deactivate the rapid shut-off (KickBack Control) and to indicate the status of the power tool.

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Status indicator for power tool (22) | Meaning/cause | Solution
--- | --- | ---
Green | Status OK | –
Yellow | Critical temperature has been reached, rechargeable battery is almost empty, or KickBack Control is switched off | Run the power tool at no load and allow it to cool down, replace or charge the rechargeable battery soon, or press the KickBack button
Illuminated red | Power tool has overheated or rechargeable battery is empty | Allow the power tool to cool down, or replace or charge the rechargeable battery
Flashing red | KickBack shutdown has been triggered | Switch the power tool off and on again
Flashing blue | Power tool is connected to a mobile device or settings are being transferred | –

Status indicator for power tool (9) | Meaning/cause
--- | ---
Green | The green LED indicates that the required/preset slope angle is reached approximatelyA)
Yellow | The yellow LED indicates that the slope angle is approaching the required/preset slope angleA)
Flashing yellow, then briefly illuminated green | Surface is being taught in
Flashing yellow, then briefly illuminated yellow | Initialisation process not carried out correctly

A)

  The electronic angle detection (EAD) does not have a defined measuring accuracy that is comparable with a measuring tool, for example. Production tolerances may influence the accuracy of the indicator ranges. In addition, external conditions may affect the validity of the electronic angle detection (EAD) (e.g. misalignment of the tool with the screw or bit, evenness of the surface during the initiation operation).

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In conjunction with the Bluetooth® Low Energy Module GCY 42 / GCY 42 NC, the following connectivity functions are available for the power tool:

- Registration and personalisation
- Status check, output of warning messages
- General information and settings
- Management

Read the corresponding operating instructions for information about the Bluetooth® Low Energy Module GCY 42 / GCY 42 NC.