Sony MZ-R55 Service Manual page 105

CD RF LEVEL CHECK
Connection :
MAIN board
AP5500 (RF)
AP5430 (VC)
MAIN board
AP5117 (VCC)
AP574 (LDI0)
Adjustment Method :
1. Set the servo mode of the test mode (Mode : 000).
2. Press the ( key, and set the CD test adjustment mode
(Mode : 050) using the VOLUME + or – key.
3. Press the = or + key and move the optical pick-up to
the center circumference.
4. Insert a test CD (TDYS-1).
5. When the ( key is pressed, the CD FE balance adjustment
mode (Mode : 052) will be set after CD focus search adjust-
ment mode (Mode : 051).
6. When the ( key is pressed, the CD 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 ± 0.3 Vp-p.
(RF waveform)
8. Check that the voltage between AP5117 (VCC) and AP574
(LDI0) and at this time is below 40 mV.
9. Press the p key.
10. Exit the test mode.
oscilloscope
digital voltmeter
1.0 ± 0.3 Vp-p
Adjustment Location :
– main board (side B) –
IC509
BP801
(TEST)
– main board (side B) –
– 19 –
AP574
(LDI0)
IC503
IC501
AP5500
AP5117
(RF) AP5430
(VCC)
(VC)
TP5980
(TE)