Pioneer YPM-2106ZF 서비스 매뉴얼 - 페이지 42

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YPM-2306ZF

8) Initial Adjusting Values

All the automatic adjustments are implemented using

the previous adjustment values as the initial values

unless the microcomputer power (the backup power) is

not turned off (though there are some exceptions).

When the backup is turned off, automatic adjustment is

executed based on the initial values rather than the pre-

vious adjustment values.

9) Displaying Coefficients After Adjustment

You can display and check results of some automatic

adjustments (FE and RF offset, FZD cancel and F / T /

RFAGC) from the test mode. The following coefficients

are displayed in each automatic adjustment :

(1) FE and RF offset and FZD cancel

Reference value = 32 (The coefficient of 32 indicates

that no adjustment was required).

The results are displayed in multiples of approxi-

mately 40 mV.

An example : When FZD cancel coefficient = 35

35 − 32 = 3

3 × 40 mV = 120 mV

Since the corrected value is approxi-

mately +120 mV, the FE offset before

adjustment was −120 mV.

(2) F and T gain adjustment

Reference value = Focus/Tracking = 20

A coefficient displayed indicates an amount of

adjustment conducted on the reference value.

An example : When AGC coefficient = 40

40/20 = Overall gain has bee doubled

(+6dB). (The original loop gain of 1/2

has been doubled to have the targeted

overall gain.)

(3) RF level adjustment (RFAGC)

Reference value = 8

Coefficient = 9 to 15 ····· The direction in which the

Coefficient = 7 to 0 ······· The direction in which the

Incrementing or decreasing the coefficient by "1"

varies the gain by 0.7 to 1dB.

Maximum gain = Typically +6.5dB. Coefficient at this

time is 15.

Minimum gain = Typically −6.0dB. Coefficient at this

time is 0.

RF level is increased (the

gain is increased).

RF level is decreased (the

gain is decreased).