Pioneer CDX-M1026ZG Service Manual page 32

CDX-M1026ZG
6.2 CD 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-
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 con-
troller tool(CEP-323). Each regulator key should be
operated at the unit.
With the CEP-323 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 CEP-323 keys.
• How to enter into the test mode
1. Setup the POWER switch ON and PMM switch
RUN of CEP-323.
2. DC Regulated Power Supply power ON.
3. Pressing the RESET switch of CEP-323.
4. Wait for 10 seconds.
5. Pressing the TESTIN switch of CEP-323.
6. Insert the magazine assy.
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• Resetting the test mode
DC Regulated Power Supply power 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 TR+ or the
button TR- 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.