Sony MZ-R50 Service Manual - Page 33

Low Reflection CD Traverse Adjustment, 8. CD Traverse Adjustment, 9. CD RF Level Check

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Page 33 highlights

5-7. Low Reflection CD Traverse Adjustment Connection : Oscilloscope MAIN board TP5980 (TE) AP5430 (VC) Adjusting Method : 1. Set the servo mode of the test mode (Mode : 000). 2. Press the " key, and set the low reflection CD playback adjust- ment mode (Mode : 040) using the volume + and - keys. 3. Load any MO disc available on the market. 4. When the " key is pressed, the low reflection CD playback EF balance adjustment mode (Mode : 042) will be set after low reflection CD focus search ON (Mode : 041). 5. Press the P key to perform automatic adjustment, and check that the traverse waveform is symmetrical at the top and bottom. (Traverse Waveform) A 0V C B Specification : A = B, C >= 0.9Vp-p 6. Check that the traverse level at this time is above 0.9Vp-p. 7. Press the p key. 8. Exit the test mode. 5-9. CD RF Level Check Connection : MAIN board AP5500 (RF) AP5430 (VC) Oscilloscope Digital voltmeter MAIN board AP5117 (VCC) AP574 (LDIO) Adjusting Method : 1. Set the servo mode of the test mode (Mode : 000). 2. Press the " key, and set the CD playback adjustment mode (Mode : 050) using the volume + and -keys. 3. Press the = and + keys and move the optical pickup to the center circumference. 4. Load a CD test disc (TDYS-1). 5. When the " key is pressed, the CD EF balance adjustment mode (Mode : 052) will be set after CD focus search ON (Mode : 051). 6. When the " key is pressed, the ABCD level adjustment mode (Mode : 053) is set. 7. Press the P key to perform automatic adjustment, and check that the RF level is 1.1 ±0.3Vp-p. (RF waveform) 5-8. CD Traverse Adjustment Connection : Oscilloscope MAIN board TP5980 (TE) AP5430 (VC) Adjusting Method : 1. Set the servo mode of the test mode (Mode : 000). 2. Press the " key, and set the CD playback adjustment mode (Mode : 050) using the volume + and - keys. 3. Press the = and + keys and move the optical pickup to the center circumference. 4. Load a CD test disc (TDYS-1). 5. When the " key is pressed, the CD playback EF balance adjust- ment mode (Mode : 052) will be set after CD focus search ON (Mode : 051). 6. Press the P key to perform automatic adjustment, and check that the traverse waveform is symmetrical at the top and bottom. (Traverse Waveform) 1.1 - 0.3 Vp-p 8. Check that the voltage between AP574 (LDIO) and AP5117 (VCC) and at this time is below 40mV. 9. Press the p key. 10.Exit the test mode. A 0V C B Specification : A = B, C >= 1.0 Vp-p 7. Check that the traverse level at this time is above 1.0Vp-p. 8. Press the p key. 9. Exit the test mode. - 33 -

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– 33 –
5-7. Low Reflection CD Traverse Adjustment
Connection :
Adjusting Method :
1.
Set the servo mode of the test mode (Mode : 000).
2.
Press the
”
key, and set the low reflection CD playback adjust-
ment mode (Mode : 040) using the volume + and – keys.
3.
Load any MO disc available on the market.
4.
When the
”
key is pressed, the low reflection CD playback EF
balance adjustment mode (Mode : 042) will be set after low re-
flection CD focus search ON (Mode : 041).
5.
Press the
P
key to perform automatic adjustment, and check
that the traverse waveform is symmetrical at the top and bottom.
6.
Check that the traverse level at this time is above 0.9Vp-p.
7.
Press the
p
key.
8.
Exit the test mode.
5-8. CD Traverse Adjustment
Connection :
Adjusting Method :
1.
Set the servo mode of the test mode (Mode : 000).
2.
Press the
”
key, and set the CD playback adjustment mode (Mode
: 050) using the volume + and – keys.
3.
Press the
=
and
+
keys and move the optical pickup to the
center circumference.
4.
Load a CD test disc (TDYS-1).
5.
When the
”
key is pressed, the CD playback EF balance adjust-
ment mode (Mode : 052) will be set after CD focus search ON
(Mode : 051).
6.
Press the
P
key to perform automatic adjustment, and check
that the traverse waveform is symmetrical at the top and bottom.
7.
Check that the traverse level at this time is above 1.0Vp-p.
8.
Press the
p
key.
9.
Exit the test mode.
Oscilloscope
MAIN board
TP5980 (TE)
AP5430 (VC)
(Traverse Waveform)
A
B
C
Specification : A = B,
C
0.9Vp-p
0V
>
=
Oscilloscope
MAIN board
TP5980 (TE)
AP5430 (VC)
(Traverse Waveform)
A
B
C
Specification : A = B,
C
1.0 Vp-p
0V
>
=
5-9. CD RF Level Check
Connection :
Adjusting Method :
1.
Set the servo mode of the test mode (Mode : 000).
2.
Press the
”
key, and set the CD playback adjustment mode (Mode
: 050) using the volume + and -keys.
3.
Press the
=
and
+
keys and move the optical pickup to the
center circumference.
4.
Load a CD test disc (TDYS-1).
5.
When the
”
key is pressed, the CD EF balance adjustment mode
(Mode : 052) will be set after CD focus search ON (Mode :
051).
6.
When the
”
key is pressed, the ABCD level adjustment mode
(Mode : 053) is set.
7.
Press the
P
key to perform automatic adjustment, and check
that the RF level is 1.1 ±0.3Vp-p.
8.
Check that the voltage between AP574 (LDIO) and AP5117
(VCC)
and
at this time is below 40mV.
9.
Press the
p
key.
10.Exit the test mode.
Digital voltmeter
MAIN board
AP5117 (VCC)
AP574 (LDIO)
Oscilloscope
MAIN board
AP5500 (RF)
AP5430 (VC)
1.1 – 0.3 Vp-p
(RF waveform)