Read Sony HCD-V909AV / MHC-V909AV Service Manual online
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7. Check the level B of the oscilliscope's waveform and the A (DC
voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%
Confirm the following :
A/B x 100 = less than ± 22%
Traverse waveform
Adjustment Location :
[ BD BOARD ] — SIDE A —
[ VIDEO BOARD ] — SIDE B —
1
20
10
11
IC103
(RF)
(FE)
(FEI)
(TE)
(VC)
IC101
(PLCK)
8. Press the REPEAT button. (The tracking servo and sledding
servo are turned ON.) Confirm the C (DC voltage) is almost
equal to the A (DC voltage) is step 7.
equal to the A (DC voltage) is step 7.
Traverse waveform
0V
C (DC
voltage)
voltage)
Tracking servo
Sled servo
OFF
Sled servo
OFF
Tracking servo
Sled servo
ON
Sled servo
ON
0V
level : 1.3
±
0.6 Vp-p
A (DC voltage)
Center of the waveform
B
9. Remove the lead wire connected step 1.
RF PLL Free-run Frequency Check
Procedure :
1. Connect frequency counter to TP (PLCK) with lead wire.
1. Connect frequency counter to TP (PLCK) with lead wire.
2. Turned Power switch on.
3. Put the disc (YEDS-18) in to play the number five track.
3. Put the disc (YEDS-18) in to play the number five track.
Confirm that reading on frequency counter is 4.3218MHz.
BD board
frequency counter
TP (PLCK)
+
–
–
VIDEO SECTION
Frequency adjustment
1. Connect the frequency counter to check point of the VIDEO
board.
2. Adjust CT401 of the VIDEO board so that the frequency counter
read 13.5MHz ± 40Hz at STOP condition.
SL703 (AFADJ)
IC751
IC251
SL702 (ADJ)
SL701 (CAL BAR)
CT401
Frequency
TP410 (DCLK)
frequency counter
VIDEO board
TP410 (DCLK)
TP410 (DCLK)
+
–
–
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