Sony MP-F17W Service Manual page 24

Procedure St
13
TRK 00 sensor level
eratioa
8. Set amplitude L in Fig. 3-4 (b) to 4 divisions, and then read
amplitud!= R in Fig. 3-4 (b).
Calculate the OFF TRACK value, cefering to Table 3-1, in
accordance with R in Fig. 3-4 (b).
Then, obtain the humidity-compensated OFF TRACK value
from the following expression:
The compensated OFF TR ACK value =
OFF TRACK value+O.2(50-H)(32-1.5S)/33.5 ....
(1)
Where; H: Relative humidity (%)
S: Side SideO= 0 Side!= 1
The compensated OFF TRACK value should meet the
following formula.
-26
~
compensated OFF TRACK value
~+26
... (2)
fbI
Fig.
34 CIt's eye Pattern Signal
(EX) For R = 3.6 in the MP-Fl7W-50D, the apparent OFF TRACK
value is as shown in table 3-1.
21
31
41
51
BI
71
81
91
9.
10.
Assuming the apparent OFF TRACK = 4.5, H = 60%, and S
= O. we can obtain the compensated OFF TRACK value as
2.589 from expression
(1).
This satisfy the formula.
0.0 0.1 0.2 0.3 0.4 0.5 D.B 0.7 D.B 0.9
28.7 28.8 25.0 23.2 21.5 19.8 18.2 1B.7 15.2 13.7
12.3 10.9 9.B
B.2 7.0 5.7 !:!
3.4
2.2 1.1
0.0 -1.1 -2.1 -G.1 -4.1 -5.1 -6.0 -6.9 -7.8 -6.7
-a.8 -10.4 -11.2 -12.0 -12.8 -13.B -14.3 -15.1 -15.8 -1B.5
-17.2 -17.9 -18.S -19.2 -19.8 -2D.S -21.1 -21.7 -22.3 -22.9
-23.S -24.0 -24.B -25.1
-25.8 -2B.2 -28.7
-m.2
-'1:1.7 -28.2
-28.7 -29.1
-29.B -GD.1 -GD.S -G1.0 -G1.4 -G1.8 -G2.2 -G2.7
-G3.1 -G3.S -G3.9 -G4.3 -G4.7 -GS.O -GS.4 -G5.8 -G8.1 -GB.S
Table 3·1
Set the HDSL switch to the side 1.
Repeat item
8.
1. Connect the CH-1 probe of oscilloscope to TP-1 (TRK 0) on
IF Board 52/53 and CH-2 probe to TP-ll (TRG) on MFD
Function Checker II.
2. The oscilloscope is triggered by CH-2 (TRG).
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