Panasonic RX-DS45 Service Manual page 34

RX-DS45
4) TRACKING GAIN ADJUSTMENT
1. Set the "FREQUENCY" dial of the servo gain ad-
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juster's to "1,000" the "RANGE" selector to "x1" \AAAAAAAAAIT
and the "OSC LEVEL" control to "0.15" (1 kHz, VAAVAAVARVALVAVAAVIAVIAVIAY
150 mVp-p). WIV IVETE VTA
. Play track 1 (1 kHz) on the test disc (SZZP1054C). | 3
. Set the "MODE SELECTOR" switch from position eet
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_ Adjust VR705 until the green "SERVO GAIN" indica- A AAR AR AAA AH
tor LED comes on to indicate "GOOD". AVAVAV. VAAL
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. Set the "MODE SELECTOR" switch from position
"4" back to "2". Bee,
Note: When using an oscilloscope for this adjust- Serena eeS
ment, follow the procedure given in the "Note" *Adjust VR705 until @ equals ©.
in (4), "Adjusting Focus Gain" above.
(5) FOCUS OFFSET ADJUSTMENT
Note: Set the "MODE SELECTOR" switch of the Servo
Gain Adjuster to position "2".
. Connect the oscilloscope's CH. 1 probe across
biedek) (+) and TeEy Zee] (V-REF) on the Servo
— and CH. 2 uefa across hg=¥4e}s) (+) and
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Oelacope setting:
OLT 200 mV (CH. 1)
1V (CH. 2)
1 msec.
Input coupling AC (both CH. 1 and 2)
Trigger mode NORM (trigger CH. 1)
. Switch the player power ON, and play the 9 on the
test disc (SZZP1057C).
. Trigger the oscilloscope's CH. 1 so that the following
waveforms are observed. Adjust VR703 until the dip
in the RF signal envelope on CH. 1 is smooth and the
signal amplitude on CH. 2 is minimized, i.e. when
amplitude A equals amplitude B.
Minimize the amplitude on make @=@©).
(6) TRACKING OFFSET ADJUSTMENT
Note: Set the "MODE SELECTOR" switch of the Servo
Gain Adjuster to position "2".
. Connect the oscilloscope's CH. 1 probe across
xdek) (+) and Ggsegey (V-REF) on the Servo
ae B. and CH. 2 a across [gsygey) (+) and
GEXZeE) V-REF).
or erties setting:
200 mV (CH. 1)
1V(CH. 2)
Input coupling AC (both CH. 1 and 2)
Trigger mode NORM (trigger CH. 1)
. Switch the player power ON, and play rack 9 on the
test disc (SZZP1057C). S
. Trigger the oscilloscope's CH. 1 so that the following
waveforms are observed. Adjust VR706 until the dip
envelope'
in the RF signal envelope on CH. 1 is smooth and the
signal amplitude on CH. 2 is minimized, i.e. when
amplitude A equals amplitude B.