Panasonic RX-DT30 - CD Player Mechanical Adjustment

1, RX-DT30 1
n CD Player Section
Warning:
Caution :
This product uses a laser diode.
Refer to caution statements on page 2.
It is very dangerous to look or touch the laser beam. (laser radiation is invisible)
With the unit turned “on”, laser radiation is emitted from the pickup lens.
Avoid exposure to the laser beam, especially when performing adjustments.
Measuring Instruments and Special Tools
* Test discs
* Dual-beam oscilloscope with bandwidth of 30 MHz
1. Playability test disc (SUP1 054C).
or better (with EXT. trigger and 1 : 1 probe).
2. Uneven test disc (SZZPI 056C).
* Allenwrench(M2.0)(SZZP1101C).
* Musical program disc (ordinary).
* Lock paint (RZZOLOl)
(1) MECHANICAL ADJUSTMENT
l When the traverse deck is replaced, making adjustments
is not necessary. (The traverse deck ass’y is already
adjusted.)
l Make adjustments to improve playability if the traverse
deck has not been replaced.
1. Connect the oscilloscope’s CH. 1 probe across
m (RF) (+) and m (V-Ref.) (-) on the servo
P.C.B.(Refer to Fig. 1 on page 89)
Oscilloscope setting
: VOLT . . . . . . . . . . . . . . . . . . . . . . 200mV.
SWEEP . . . . . . . . . . . . . . . . . . . . 0.5ps.
Input coupling . . . . . . . . . . AC.
2. Switch the player power ON, and play track 19 on the test
disc (SZZ1056C).
(Playing any other track will prevent the HEX screws from
being accessed.)
3. Leave the player in play mode.
4. Alternately adjust the HEX screws with the 2.0mm allen
wrench (SZZPl 101 C) until the vertical fluctuation of RF
signal is minimized and the eye pattern is most stretched.
(Refer to Fig. 2 on page 29)
* Most stretched eye pattern
5. After completing the adjustment, lock the HEX screws
with lock paint (RZZOLOl).
(3) CHECK OF PLAY OPERATION AFTER ADJUSTMENT
* Checking skip Search
1. Play an ordinary musical program disc.
2. Press the skip button to check for normal skip search
operation (in both the forward and reverse directions).
* Checking Manual Search
1. Play an ordinary musical program disc.
2. Press the manual search button to check for smooth
manual search operations at either low or high speed (in
both the forward and reverse directions).
* Checking Playability
1. Play the 0.7mm black dot and the 0.7mm wedge on
the test disc (SZZP1054C) and verify that no sound
skip or noise occurs.
2. Play the middle tracks of the uneven test disc
(SZZPlOSSC) and verify that no sound skip or noise
occurs.
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