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CDS-P5000

7.2.2 TEST MODE

1)Precautions

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

regulator. 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 impossible

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 follow-

ing.

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 sta-

bilize.

• 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

control unit (KEH-P7000, etc.). Each regulator key

should be operated at the unit.

With the KEH-P7000 taken up for reference, a descrip-

tion will be given below concerning how to enter into

the test mode, including key operations. The key in

the adjustment text is also one of the KEH-P7000

keys.

• How to enter into the test mode

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

keys together.

• Resetting the test mode

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 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.)

• 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.