Testing Set-Up And Checking Signals - LG -200 Service Manual

7. Back-light Illumination
In Back-light illumination, there are 10 green LEDs (six for keys and four for the LCD) in User interface
Board, which are driven by BACKLIGHT_EN line from CPP.

2-8. Testing Set-up and Checking Signals

1. Receiver RF Levels and Checks
This section shows the typical RF levels expected throughout the receiver path. A block diagram
showing the locations of the RF measurement points and levels is shown in Figure1.
2. Receiver Testing Set-up
To check the receiver the following conditions have to be set:
1. On a signal generator or a GSM/DCS test box, output a CW signal of amplitude = -40dBm at either:
947.4MHz (CH62) when testing the GSM Rx path or 1842.6MHz (CH699) when testing the DCS Rx
path.
2. Set the DC power supply to 3.8volts.
Note : All RF values shown are only intended as a guide figure and may differ from readings taken with
other test equipment and leads. Lead and connector losses should always be taken into account
when performing such RF measurements.
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