42
CDX-P1250
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 tray extraction and return oper-
ations is performed by means of the photo transistor
in this unit. Consequently, if the inside of the unit is
exposed to a strong light source with the outer casing
removed for repairs or adjustment, the following mal-
functions may occur:
*Even with a disc loaded, the unit detects "no disc"
and cannot start play.
*Although a 12-cm disc is loaded, the unit detects
"8cm disc" mistakenly.
When the unit malfunctions this way, either re-posi-
tion the light source, move the unit or cover the photo
transistor.
• During exchanging discs, do not press the keys for
the discs to be exchanged.
2) Test Mode
This mode is used for adjusting the CD mechanism
module of the device.
• Test mode starting procedure
Reset while pressing the 4 and 6 keys together.
• Test mode cancellation
Switch ACC, back-up OFF.
• If the 8 or 9 key is pressed while focus search is in
progress, immediately turn the power off (otherwise
the actuator may be damaged due to the lens stuck).
• Jump operation of TRs other than 100TR continues
after releasing the key. CRG move and 100TR jump
operations are brought into the “Tracking close” sta-
tus when the key is released.
• Powering Off/On resets the jump mode to “Single TR
(91)”, the RF AMP gain setting to 0 dB, and the auto-
matic adjustment value to the initial value.
• During exchanging discs, do not press the keys for
the discs to be exchanged.
7.2.2 TEST MODE
-
CD Test Mode
Key to adjustment text
HEAD UNIT (6 keys type)
inside (12 keys type)
BAND
BAND
TRK+/FF
TRK+/FF
TRK-/REV
TRK-/REV
7
1
8
2
9
3
10
4
11
5
12
6
DISC-
DISC-
SOURCE ON/OFF
SOURCE ON/OFF
Summary of Contents for CDX-P1250
Page 6: ...6 CDX P1250 2 2 EXTERIOR ...
Page 8: ...8 CDX P1250 2 3 CD MECHANISM MODULE ...
Page 14: ...14 CDX P1250 1 2 3 4 1 2 3 4 D C B A A2 2 A 1 2 SYSTEM CONTROLLER EWmodel UC ESmodel ...
Page 22: ...22 CDX P1250 1 2 3 4 1 2 3 4 D C B A SIDE A B POWER UNIT B CN701 A CORD 4 2 POWER UNIT IP BUS ...
Page 23: ...23 CDX P1250 D C B A 1 2 3 4 1 2 3 4 B POWER UNIT B SIDE B ...
Page 25: ...25 CDX P1250 D C B A 1 2 3 4 1 2 3 4 E 4 5 MOTOR PCB MOTOR PCB E C ...
Page 30: ...30 CDX P1250 Grating waveform 45 0 75 60 30 90 Echt Xch 20mV div AC Fcht Ych 20mV div AC ...
Page 48: ...48 CDX P1250 7 3 BLOCK DIAGRAM A C D E ...
Page 49: ...49 CDX P1250 B ...
