Denon DCD-3300 - Page 14

MAINTENANCE AND ADJUSTMENT
PROCEDURE
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For necessary operations to perform part replacement,
repairing, and adjustment, it is feasible by using of opera-
tion buttons normally used for playing to adjust tracking,
focus, etc. of the laser pick-up, because of a service soft-
ware (service mode) is programed to a microcomputer
employed in this model.
Hereafter
the adjustment procedures for each circuit
checking and servo system adjustment are explained as the
unit is set to service mode condition except for specified
case,
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. SETTING OF SERVICE MODE
Turn off the power (do not load a disc).
Remove top cover for confirming of inside.
Short-circuit pins and (3), TP-204 of signal proces-
sing P.W.B. (KU-6040). It is convenient to use a
connector with wires like one the illustration shows.
Note: Never short-circuit TP-204 after the power
turned on.
By turning on the power, “ oe and TOTAL StNGLE
indication light on the TRACK NO. section of the
display.
On this state, all buttons’ functions for normal playing
are inoperative and the disc tray can not be opened or
closed.
Short
Vy
Short-circuit Connector Jig for TP-204
2. NOTES ON OPERATION BUTTONS IN
SERVICE MODE
(1} Play Button ( » PLAY)
Each push of the button to actuate the following servo
circuit operation in consecutive order. Pushing it four
times actuates all servo operations.
@ Push it once : Actuates focus servo circuit
(“1 appears on the calendar.)
: Actuates spindle servo circuit
(“‘2” appears on the calendar.)
: Actuates tracking servo circuit
(3”' appears on the calendar.)
: Actuates slide servo circuit
(“4"' appears on the calendar.)
When focus servo operation is defective, it will not go
to the next step however the play button is pressed.
@ Push it twice
® Push it three times
® Push it four times
Note: And confirm if the designated lights is off in
all through lights 1 to 20 at the initial time.
(2) Stop Button (= STOP)
(3)
(4)
Pushing the button to cancel all circuit operations.
To check servo circuit again or recheck from the
beginning, put it.
Automatic Search Button (kq Pl)
In service mode, this button has two functions.
1 In stop state (include the condition after the
power is turned on):
The pick-up slides.
While pushing ( Ki ) side of the automatic search
button, pick-up moves to disc center; while push-
ing ( bi ) side, it moves to disc outer circle.
2 Inthe state when play button ( » PLAY) is pressed
four times and all servo circuits are activated:
Performs track jump.
There are three types of track jump (1, 10, 100
tracks) and are switchable by pause button
(EEPAUSE).
@ Except for the above two conditions, this button
will not function even if it is pressed.
(An example: In such a case when the play button
is pressed three times and the servos are activated
up to tracking.)
@ Pushing the track button (Ki D1) while all servo
circuits are activated makes the tracking servo gain
lowered.
Note that the adjustment of tracking servo
explained later must be performed under the
tracking servo is in high gain. To put it in high gain
condition, turn off the power once and turn on
again, then activate all servo circuits.
Pause Button ([]| PAUSE)
Switches track jump mode.
It is always reverted to 1 track jump mode whenever
the power is turned on.
Each push of the button shifts the mode to 10-track,
100-track, 1-track ... In 1-track jump “///}"; 10-
track jump “(7 /"; 100-track jump “fhe! lights on
the display to show respective mode. .
Confirmation of track jump mode can be obtained by
the time width of tracking error signal.
. CHECKING OF FOCUS, SPINDLE,
TRACKING, AND SLIDE SERVO
OPERATIONS
Be sure to observe the preceding ‘Turntable Height
Adjustment” at the time of repair to remove the turn-
table or in case of disc hit the tray.
Also when replaced the parts, be sure to do the follow-
ing servo system adjustments prior to these adjustments.
Bie Sette,
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