Panasonic GD90 Service Manual page 52

TEST AND MEASUREMENT
3. If image leak ratio is greater than 30 dBc then unit is OK. (offset calibration is complete).
4. If image leak ratio is less than 30 dBc then proceed to Ich gain calibration.
I
Qch Gain Calibration
1. Set IQch gain to -0.25 dB.
a. On the Channel box press F6.
b. Press the left-right arrow keys until IQCH GAIN field is highlighted. Press ENTER.
c. Enter 1 into the data field (for -0.25dB). Press ENTER.
2. Measure the image leak ratio.
3. If image leak ratio is greater than 30 dBc, then unit is OK. (offset calibration is complete)
4. If image leak ratio is less than 30 dBc, then repeat steps 1, 2 and 3 with IQch gain values: -0.50 dB (2), -0.75 dB (3).
5. If image leak ratio is still less than 30 dBc, then the unit is a fail.
Issue 1
Revision 0
Section 6
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MCUK990801C8
Service Manual