Denon DCD-1420 - Adjustment Procedures; Service Program Initialization; Service Program Functions; Pre-adjustment and Equipment

ADJUSTMENT
Microcomputer built in the unit, comprises service program to facilitate servo adjustment by pushing operation button.
1. Start service program
| (1) Turn power switch OFF.
| (2) Shortcircuit pins @), @) of connector (TP102) on P.W.B. (Main Unit)
(Caution) Do not touch other pins.
(3) Turn power switch ON. “
4 (Service program starts, and displays track number ud )
(Caution)
@ When service program started normal operation of buttons will be defeated,
2. Service program function
Function Description
A OPEN/CLOSE Opens or closes the disc holder. *, Opens or closes only when. disc is: stopped.
| —_ e Operate other keys after open or close.
: e Displays track number Hf es
STOP Stops system function. .
| > PLAY Starts focus servo and disc e Push when adjust tracking offset. i
turns. e When completed, displays track number uc.
| Starts focus servo, tracking e When PLAY button is pushed, starts tracking servo and
1
1) PAUSE servo, slide servo, spindle slide servo. me
;
servo,
e
When
completed,
track
number
tia.
| Giher bution Aoornal operation e Do not operate buttons other than above.
. e If misoperated, immediately turn power switch OFF.
(Caution)
| @ Do not use remote control during service program mode.
3. Adjustment
(1) Prior to start adjustment
Before adjusting laser P,U. and spindle motor, be sure adjust turntable height at the time of turntable assembly.
(2) Necessary equipment for adjustment
Dual trace oscilloscope
Reference disc (CA-1094) BHAT
Oscillator (10 Hz ~ 10 kHz, 0 ~ 3 Vp-p) 33 k2
0.001 uF Output
Input
Frequency counter (readable more than 5 MHz) (Main a (Osciloscope)
: Filter for measurement
(Filter for measurement)
afr WN =