Pioneer YPM-2106ZF Service Manual - Page 16

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YPM-2306ZF

6. ADJUSTMENT

6.1 CD ADJUSTMENT

1)Precautions

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

ulator. The signal reference potential, therefore, is

connected to REFO(approx. 2.5V) instead of GND.

If REFO 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 REFO and GND together. It is especially

important not to connect the channel 1 negative

probe of the oscilloscope to REFO 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 REFO 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.

• This unit is adjusted in a combination with the CD con-

trol unit(GGF1298). Each regulator key should be

operated at the unit.

• Test mode starting procedure

Switch ACC, back-up ON while pressing the 4 and 6

keys together.

• Test mode cancellation

Switch ACC, back-up OFF.

• Disc detection during loading and eject operations is

performed by means of a photo transistor in this

unit.Consequently, if the inside of the unit is exposed

to a strong light source when the outer casing is

removed for repairs or adjustment, the following mal-

functions may occur.

*During PLAY, even if the eject button is pressed,the

disc will not be ejected and the unit will remain in

the PLAY mode.

*The unit will not load a disc.

When the unit malfunctions this way, either re-posi-

tion the light source, move the unit or cover the

photo transistor.

• When loading and unloading discs during adjustment

procedures, always wait for the disc to be properly

clamped or ejected before pressing another key.

Otherwise, there is a risk of the actuator being

destroyed.

• Turn power off when pressing the button 2 or the but-

ton 3 key for focus search in the test mode. (Or else

lens may stick and the actuator may be damaged.)

• SINGLE/4TRK/10TRK/32TRK will continue to operate

even after the key is released.Tracking is closed the

moment C-MOVE is released.

• JUMP MODE resets to SINGLE as soon as power is

switched OFF.