Adjustment - Pioneer CDX-M8086ZT/E Service Manual

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6. 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 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-
TE
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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.
• With this system, elevation is detected by the photo-
transistor. Therefore, if light hits the phototransistor,
elevation may operate incorrectly. Should the system
be operated with the upper case removed, use some
opaque material to shield the photo transistor from
light.
• When unloading magazine during adjustment proce-
dures,always wait for the magazine to be properly
ejected before pressing another key.
• Turn power off when pressing the TRK UP or TRK
DOWN button during focus search in the test mode.
(Or else lens may stick and the actuator may be dam-
aged.)
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2)Test Mode
• This unit is adjusted in a combination with the CD
control unit (KEX-M9076ZT/UC, etc.). During adjust-
ment, each operation should be done by using the
buttons on the CD control unit.
With the KEX-M9076ZT/UC taken up for reference, a
description 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 KEX-
M9076ZT/UC keys.
Normal mode
Diagnosis mode
CD test mode
• How to enter into the test mode
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• Resetting the test mode
Switch ACC,back-up Off.
• SINGLE/10TRK/32TRK will continue to operate even
after the key is released.Tracking closed the moment
C-MOVE is released.
• JUMP MODE resets to SINGLE as soon as power is
switched off.
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Press the CD key three times,
while holding down the [1] and
[6] keys simultaneously.
Press the TRK UP and CD keys
simultaneously.
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