Adjusting the intercom for the GOC audio box

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
2	10 minutes	30 minutes	10 minutes

Operator Volume Control	Controls the speaker volume in the bore (operator’s voice).
Patient Volume Control	Controls the volume of the speaker from the keyboard (patient’s voice).

Audio assembly is located in the GOC. The following is the volume location of audio assembly.


OCSPK MAX (R28)	Maximum keyboard speaker volume R28 (patient’s voice)
OCSPK MIN (R13)	Minimum keyboard speaker volume R13 (patient’s voice)
PATSPK MAX (R67)	Maximum patient speaker volume R67 (operator’s voice)

At the Operator Workspace keyboard, set the Patient Volume Control at maximum, by rotating the volume wheel UP with your finger, (Clockwise).

Figure 3. VOLUME CONTROLS
One-person talks into the patient microphone in the magnet bore. The second person adjusts R28 on the Intercom Board for the desired maximum volume at the keyboard speaker. This is an iterative process. Repeat the voice test until the maximum desired level is achieved.

This section adjusts the minimum volume of the Patient’s voice, in the magnet bore. The Operator benefits from this adjustment.

At the Operator Workspace keyboard, set the Patient Volume Control at minimum, by rotating the volume wheel down with your finger. (counterclockwise).

Figure 4. VOLUME CONTROLS
One person should listen at the keyboard speaker (Patient’s Voice). The other person talks into the patient microphone in the magnet bore. The person at the keyboard should make minor adjustments to R13 on the Intercom Board for the desired minimum volume at the keyboard speaker. This is an iterative process. Make a slight adjustment to the potentiometer, test the volume and repeat the voice test until the desired Minimum Volume level has been achieved.

At the Operator Workspace Keyboard, set the patient volume control at maximum by rotating the Operators volume wheel UP with your finger, (Clockwise).

Figure 5. VOLUME CONTROLS
One person listens at the patient speaker. The other person talks into the keyboard microphone and adjusts R67 on the Intercom Board for the desired maximum volume at the keyboard speaker. This is an iterative process. Repeat the voice test until the maximum desired level is achieved.

Note:
1. If R67 is turned to clockwise too much, howling sound may be heard from Patient Speaker. Adjust R67 not to cause this problem.

2. Set the Operator Volume to “4” and check that howling sound is not heard. (As a result of the experiment, howling sound is often heard when Operator Volume is set to “4”)

Check that the Patient Alarm sound can be heard from OCSPK when pushing the PANIC SW at Table in Magnet Room.
If it is necessary to adjust the volume of Patient Alarm, adjust HELP BEEP VOL(R52) on GOC AUDIO BOX.