Pioneer CDS-9036ZT/ES, Service Manual

29

CDS-9036ZT

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.

•

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.

6. ADJUSTMENT

6.1 CD

CD TEST

CONTROL UNIT(SIDE A)

Short-circuit these two probes.