Pioneer DVL-909 Servicehandleiding - Pagina 20

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DV-505, DVL-909, DV-S9

3.8.3 Startup Sequence

The basic flow is shown below. The parentheses indicate a limitation:

"base" represents base models, such as the DV-505 and DV-S9,

and "compatibles" represents DVD-LD compatible models, such as

the DVL-909.

(1) Closes the tray.

(2) Runs the tilt servo for 1.5 seconds (compatibles).

(3) Detects the peak.

(4) Distinguishes the disc.

(5) SGC

(6) Turns on the focus servo.

(7) Turns on the tilt servo (compatibles).

(8) Starts the spindle rotation.

(9) ATB

(10) Measures the MIRR modulation degree.

(11) Turns on the tracking servo.

(12) Turns on the slider servo.

(13) Turns on the spindle servo.

(14) Focus AGC

(15) Tracking AGC

(16) AFB

(17) Plays AGC (base for CDs)

(18) Plays back.

For a 2-layer DVD, steps (9) through (16) are repeated for each

layer.

When starting up with [TV/LDP] in Test mode, all the steps (1)

to (18) are performed for a DVD, and steps (1) to (10) are

performed for a CD.

3.8.4 Peak Detection

Overview

This is a new function to measure the size and location of the sine

wave related to focus errors at the beginning. The measurement is

performed in the normal startup process and in Test mode, as well.

If the sine wave is small, the OE IC gain is switched. Only the

judgment for NO DISC is accomplished at this time. The operation

is in effect as for judgment for DISC .

Using the Function in Test Mode

This function is not assigned to any remote control keys. Only an

open/close operation can trigger the function.

3.8.5 Disc Distinction

Overview

This function is almost the same as that with the first-generation

models. The only difference is as follows: If an error occurs in the

startup sequence and playback cannot be started, startup is retried

after forcibly switching the disc distinction from DVD to CD or

vice verse by a backup process. If startup fails again, it is canceled,

and an error is generated. The types of error that triggers the backup

process for disc distinction are discussed in the next section.

Using the Function in Test Mode

This function is not assigned to any remote control keys. Only an

open/close operation can trigger the function.

3.8.6 SGC

Overview

This is a new function to maintain the sine wave related to focus

errors to a certain size so that the sine wave shows 1.8 V for the P-

to-P value.

This operation is performed each time after judging disc presence

and distinction in the normal startup process and in Test mode, as

well. The operation is achieved by switching the FE gain inside the

RF IC (LA9700) by using the voltage at the SGC connector (pin 22)

of the RF IC.

Using the Function in Test Mode

This function is not assigned to any remote control keys. Only an

open/close operation can trigger the function.

3.8.7 Measurement of MIRR Modulation

Degree

Overview

The slice voltage of the RF signal is measured and used in the

calculation to generate the MIRR signal. This operation is made in

synchronization with ATB ON/OFF in normal startup and in Test

mode, as well.

3.8.8 AFB (Auto Focus Bias) Function

Overview

Among the first-generation models, this function supports only CDs

with the basic models, such as the DV-7. Among the new models,

this function supports DVDs with all models, but CDs only with the

basic models. The operation is executed only once (once for each

layer for a 2-layer DVD) after the focus and tracking AGC at startup.

The operation is accomplished not by centering the focus servo to

Vref (2.5 V), but by gradually changing the center value for the

optimum jitter value. Thus, performance with an improper or dirty

disc (by fingerprints, etc.), or the temperature characteristics (at 0 C,

35 C, etc.) will be improved.

OverviewUsing the Function in Test mode

(the Remote Control Keys to be Used are

Indicated in Brackets)

As the function is to be synchronized with AGC, turn on and off

AFB by pressing [TEST] + [7]. The jitter value measurement cannot

be made with AFB ON.