Denon DCD-1500 Service Manual page 15

(4) Checking of Spindle Servo
After checking the focus servo, Bushs ain. button. oe
{ >» PLAY) again, The disc starts to. run.
With this revolution of disc, the servo operation can
be confirmed. ; ;
{Confirm that 2" indicates on the calendar.)
Note: If the disc does not run due to spindie servo
malfunction or runs fast, the following
"Checking of Tracking Servo" will be im-
possible,
{5) Checking of Tracking Servo
Push play button (> PLAY} again.
When tracking servo is properly operated, a "Sizzle"
sound from 'the' operation of tracking actuator of
laser pick-up will be produced.
(Confirm that 3" indicates on the calendar.)
Note: Same as previous column, if it is not property
operated the following checking..will be
impossible,
{6} Checking of Stide Servo
Note: Before checking, prepare and insert a head-
phone into the headphone jack with a
volume adjusted to adequate level.
Push play button ( » PLAY) again.
When slide servo is properly operated, the sound
will be heard through the headphone.
This sound not always be heard normally, for many
instances it will be heard as if it is muted.
(Confirm that 4" indicates on the calendar.)
4, ADJUSTMENT
(4) Before Adjustment. wes
Adjustment' .order is, first to adjust' *Lurritable height,
etc. at the time complete assembling, secondly 'to
adjust electrical adjustments for laser pick-up system
and spindle motor system to complete. :
The adjustment of the super-linear converter employed
in this unit aiming to reduce a distortion at the
time of O/A conversion is unnecessary except for
special occasion.
(2) Measuring Equipments-and Implements for Adjustment
@ Dual-mode oscilloscope. ; .
@® Specified disc for adjustment
"@ Measuring filter
Note: if there is no sound, ihe taser pick-up may
4 . ..be set at disc's lead-in or lead-out position.
° For this case, move the laser pick-up to the
program are referring to the column 4.(5) Q).
7) Checking of Playback Sound
@ Connect the line-out of this unit to an appro
priate amplifier so that the playback sound can
be checked.
Push either side of track button ( 4.» ).
In this state tracking servo becomes low gain and
the unit becomes normal playing condition.
(8) Checking of General Functions
Turn off the power and disconnect the jumper to
- pins @)} and @) of TP-204.
Turn on the power and check aif playing controls
for 'proper functions.
Note: Because of a timing of the microcomputer
employed in the unit, occasionally it does
not accept a command from the button.
in this case do not judge it for defective,
repeat the same check for several times.
33k
IN s 0 ouT
| 0014F
@ Audio frequency oscillator
10 kHz, 3 Vp-p output maximum
© Frequency counter
Count up to 5 MHz minimum
© Connector with wires for signal pick-up
6p. 1 each
3p 2 ach
@ Headphones ~
Checking of ptayback 'sound