Pioneer DEH-P6400R Instrukcja serwisowa - Strona 16

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DEH-3300R-2,3330R-2

CD ADJUSTMENT

1) Precautions

• This unit uses a single power supply (+5V) for the reg-

ulator. The signal reference potential, therefore, is

connected to VREF(approx. 2.1V) instead of GND.

If VREF and GND are connected to each other by mis-

take during adjustments, not only will it be impossi-

ble to measure the potential correctly, but the servo

will malfunction and a severe shock will be applied to

the pick-up. To avoid this, take special note of the fol-

lowing.

Do not connect the negative probe of the measuring

equipment to VREF and GND together. It is especially

important not to connect the channel 1 negative

probe of the oscilloscope to VREF with the channel 2

negative probe connected to GND.

Since the frame of the measuring instrument is usual-

ly at the same potential as the negative probe, change

the frame of the measuring instrument to floating sta-

tus.

If by accident VREF comes in contact with GND,

immediately switch the regulator or power OFF.

• Always make sure the regulator is OFF when connect-

ing and disconnecting the various filters and wiring

required for measurements.

• Before proceeding to further adjustments and mea-

surements after switching regulator ON, let the player

run for about one minute to allow the circuits to stabi-

lize.

• Since the protective systems in the unit's software are

rendered inoperative in test mode, be very careful to

avoid mechanical and /or electrical shocks to the sys-

tem when making adjustment.

• The RFI and RFO signals are easy to oscillate because

of a wide band. When observing them, insert a resis-

tor of about 1 kΩ to the series.

• This equipment will not guarantee the load ejection

operation when the mechanical unit is turned upside

down. In particular, if the ejection operation is incor-

rectly performed and recovery is disabled, the recov-

ery is enabled by resetting a product or turning ACC

off to on.

2) Test Mode

This mode is used for adjusting the CD mechanism

module of the device.

• Test mode starting procedure

Reset while pressing the 4 and 6 keys together.

• Test mode cancellation

Switch ACC, back-up OFF.

• After pressing the EJECT key, do not press any other

key until the disk is completely ejected.

• If the ] or [ key is pressed while focus search is in

progress, immediately turn the power off (otherwise

the actuator may be damaged due to adhesion of the

lenses).

• Jump operation of TRs other than 100TR continues

after releasing the key. CRG move and 100TR jump

operations are brought into the "Tracking close" sta-

tus when the key is released.

• Powering Off/On resets the jump mode to "Single

TR(91)", the RF AMP gain setting to 0 dB, and the

automatic adjustment value to the initial value.