62
AVIC-505
-
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.
· 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.
· Test mode starting procedure
1. Short-circuit the test point of the
cdtest
(IC801
Pin6) on the main unit with GND.
2. Press RESET and turn the power ON.
· Test mode cancellation
1. Turn the test point of the
cdtest
open.
2. Press RESET or switch ACC, back-up 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
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.
· Turn power off when pressing the button
→
or the
button
←
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.
Summary of Contents for AVIC-505
Page 4: ...4 AVIC 505 2 EXPLODED VIEWS AND PARTS LIST 2 1 PACKING ...
Page 6: ...6 AVIC 505 2 2 EXTERIOR ...
Page 7: ...7 AVIC 505 ...
Page 9: ...9 AVIC 505 ...
Page 10: ...10 AVIC 505 2 3 CD MECHANISM MODULE ...
Page 18: ...18 AVIC 505 1 2 3 4 1 2 3 4 D C B A A a A b A 3 3 MAIN CPU 1 3 A b ...
Page 33: ...8 33 AVIC 505 5 6 7 8 5 6 7 D C B A A D D b ...
Page 34: ...AVIC 505 1 2 3 4 1 2 3 4 D C B A D a D b D 34 D a ...
Page 35: ...35 AVIC 505 5 6 7 8 5 6 7 8 D C B A D a D b E CXB3043 CXB2199 CXA8702 E D a ...
Page 36: ...36 AVIC 505 1 2 3 4 1 2 3 4 D C B A D a D b D b ...
Page 37: ...37 AVIC 505 5 6 7 8 5 6 7 8 D C B A D a D b A D b ...
Page 41: ...41 AVIC 505 ...
Page 44: ...44 AVIC 505 1 2 3 4 1 2 3 4 D C B A MAIN UNIT A A ...
Page 45: ...45 AVIC 505 5 6 7 8 5 6 7 8 D C B A SIDE B A ...
Page 47: ...47 AVIC 505 1 2 3 4 1 2 3 4 D C B A SIDE B GRILLE PCB B B RESET ...
Page 48: ...48 AVIC 505 1 2 3 4 1 2 3 4 D C B A 4 3 PS PCB PS PCB SIDE A C C CORD ASSY A CN703 B CN152 ...
Page 49: ...49 AVIC 505 1 2 3 4 1 2 3 4 D C B A SIDE B PS PCB C C ...
Page 51: ...51 AVIC 505 1 2 3 4 1 2 3 4 D C B A SIDE B D CONTROL UNIT D E HOME CLAMP ...
Page 65: ...65 AVIC 505 Grating waveform Ech Xch 20mV div AC Fch Ych 20mV div AC 45 0 75 60 30 90 ...
Page 96: ...96 AVIC 505 7 3 2 BLOCK DIAGRAM ...
Page 97: ...97 AVIC 505 ...