Bacharach 2772-0803 manual 200 to, Hold

REMOTE INTELLIGENT SENSOR - AREA MONITOR

SUPPLEMENT A

A1 EARLIER RIS BASE BOARDS

A1.1 ADJUSTING LIGHT LEVELS ON PHASE 1 RIS UNITS

Several references to RlS’s manufactured before April 1992 with phase 1 base boards have been given in the main manual (Sections 1.1, 1.3.7, 2.8.2.1, & 4.4) Any references to Figure 2-3 should be refered to Figure S-3.

The light level adjustment POTs for boards manufactured before April 1992 are mounted under the tape cassette which has to be removed before the light levels can be adjusted as explained below:

Enter the TEST Mode by pressing the red button on the back of the door. Wait until the display has cycled to show:

Press the HOLD/RELEASE button on the front panel firmly so that the display shows:

200 to 254

1

200 to 254

1 HOLD

Figure S-1. Test Mode

This display status will be maintained for 5 minutes, or until the HOLD/RELEASE button is pressed again.

Adjustment is made by means of the two potentiometers that are located under the cassette position and accessed through holes in the top plate. The light level track 1 is adjusted by one, and track 2 by the other. The potentiometer access holes cannot be seen until the cassette is removed. See Figure S-2.

Figure S-2. Pre-4/92 Light Level Access Holes

Adjustment method ‘a’. Make sure that tape in the gate is clean and unstained. Close the tape gate. Observe the displayed light level for track 1 and decide if it needs increasing or decreasing.

Open the tape gate and remove the cassette, turn the appropriate potentiometer a little clockwise to decrease, or counter clockwise to increase, the light level.

Reinstall the cassette and check the light level value; if necessary repeat this process until a value of 220 is achieved.

Instruction 2772-0803 Page S-A1