Sony MZ-R37 Service Manual page 19

CD RF LEVEL CHECK
Connection :
MAIN board
AP538 (RF)
AP503 (VC)
MAIN board
AP5117 (VCC)
AP574 (LDIO)
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 EF 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 ± 0.33 Vp-p.
(RF waveform)
8. Check that the voltage between AP5117 (VCC) and AP574
(LDIO) and at this time is below 40 mV.
9. Press the p key.
10. Exit the test mode.
oscilloscope
digital voltmeter
1.1 ± 0.33 Vp-p
Adjustment Location :
SP526 (TE)
– 19 –
MAIN BOARD (SIDE B)
IC701
AP538 (RF)
AP574 (LDIO)
IC501
AP503 (VC)
AP5117 (VCC)
IC901
MAIN BOARD (SIDE A)