Panasonic RX-DS45 Service Manual page 35

(7) TRACKING BALANCE ADJUSTMENT
1. Set the "FREQUENCY" dial of the servo gain ad-
juster's to "1,000" the "RANGE" selector to "x1"
and the "OSC LEVEL" control to 0.15" (1 kHz,
150 mVp-p).
. Connect the hot lead of the oscilloscope's CH. :
probe to [faraek] (RF) and the cold lead to Feyaend
(V-REF).
"Connect the hot lead of the oscilloscope's CH. 2
probe to TP1 on the servo gain adjuster.
Oscilloscope setting:
LT 100 mV (CH. 1)
Input coupling AC (both CH. 1 and 2)
Trigger mode NORM (trigger CH. 2)
. Play track 1 (1 kHz) on the test disc (SZZP1054C).
. Set the "MODE SELECTOR" switch of the servo
gain adjuster to position "1".
. The waveform as shown at right will appear on the
RX-DS45
SRE
TTA
Hea he ieee t-te
|
ee eee ate
|_|
pri iP i" iP
a'a'a aia
* This section of the waveform must be balanced.
oscilloscope. Adjust VR702 until the envelope ampli-
tude indicated by the asterisk is minimized uniformly.
(8) CHECK OF PLAY OPERATION AFTER ADJUSTMENT
"Checking Skip Search
1. Play an ordinary musical program disc. "Checking Using Defect Disc
2. Press the skip button to check for normal skip search 1. Play the 0.7 mm black dot and the 0.7 mm wedge on
operation (in both the forward and reverse direc- the defect test disc (SZZP1054C) and verify that no
tions). sound skip or noise occurs.
2. Play the middle tracks of the uneven test disc and
"Checking Manual Search , : ;
verify that no sound skip or noise occurs.
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).
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