General Information; Diagnosis; Test Mode - Pioneer AVX-P7000CD UC Service Manual

AVX-P7000CD
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7. GENERAL INFORMATION

7.1 DIAGNOSIS

7.1.1 TEST MODE

- CD 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
mistake 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 following.
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
usually at the same potential as the negative
probe,change the frame of the measuring instrument
to floating status.
If by accident REFO comes in contact with
GND,immediately switch the regulator or power OFF. TE
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• Always make sure the regulator is OFF when
connecting and disconnecting the various filters and
wiring required for measurements.
• Before proceeding to further adjustments and
measurements after switching regulator ON,let the
player run for about one minute to allow the circuits
to stabilize.
• 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
system 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
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 KEH-
P7000 keys.
• How to enter into the test mode
Switch ACC,back-up ON while pressing the 4 and 6
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keys together.
• Resetting the test mode
Switch ACC,back-up Off. .
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• 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
malfunctions 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-
position 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.
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• 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
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.
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