Pioneer DEH-M8047ZT/UC Service Manual page 98

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1.3.7 Initial values in adjustment
A
For each auto-adjustment, the last adjustment results are basically used as the initial settings of the next adjustment
unless the microcomputer is turned off (or the backup is off). When the microcomputer (or the backup) is turned off,
the last adjustment results are not used, but the factory settings.
1.3.8 Adjustment result display
For some of the adjustments (FE and RF offset, FZD cancel, F and T gain, and RFAGC), the adjustment results can be
displayed and confirmed in the test mode.
1) FE and RF offset
Reference coefficient = 32 ("32" indicates no adjustment required)
B
The display is expressed in the unit of about 32mV.
Ex. When the FE offset coefficient is 35:
35 - 32 = 3 x 32mV = 96mV
This means that the correction is about +96mV, and the FE offset before adjustment is -96mV.
2) F and T gain adjustment
Reference coefficient for focus and tracking = 20
The displayed coefficient / the reference coefficient indicates the adjusted gain.
Ex. When the AGC coefficient is 40:
40/20 = 2 times (+6dB)
That is, the gain was adjusted by +6dB.
C
(The original loop gain was half the target one. So, the whole gain was doubled.)
3) RF level adjustment (RFAGC)
Reference coefficient = 8
The coefficient 9 to 15 indicates increasing the RF level.
The coefficient 0 to 7 indicates decreasing the RF level.
When the coefficient display changes by 1, the gain changes by 0.7 to 1dB.
When the coefficient is 15, the gain is maximum or TYP + 6.5dB.
When the coefficient is 0, the gain is minimum or TYP - 6.0dB.
D
E
F
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