Pioneer CDS-9036ZT/ES Service-Handbuch - Seite 29

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6. ADJUSTMENT

6.1 CD

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.

• 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 /FF or the

button REV key for focus search in the test mode. (Or

else lens may stick and the actuator may be dam-

aged.)

2)Test Mode

The CDS-9036ZT/ES is used together with a CD con-

trol unit(KEH-M8276ZT/X1N/ES) to make adjustment.

For adjustment, keys of the CD control unit are used.

For your reference, how to enter Test mode and oper-

ate keys when using a CD control unit are shown be-

low. The keys mentioned in the explanation of adjust-

ment are of a CD control unit(KEH-M8276ZT/X1N/ES).

• Entering Test mode

Short-circuit the probes indicated as "CD TEST" on

the substrate of the CDS-9036ZT/ES, then set ACC or

BACK UP to ON.

CONTROL UNIT(SIDE A)

CD TEST

Short-circuit these two probes.

• Cancelling Test mode

Set ACC or BACK UP to OFF.

• 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.

CDS-9036ZT