Sony CDP-557ESD - Section 2: Electrical Adjustments; Adjustment Mode; RF PLL Adjustment

CDP-557ESD/707ESD
SECTION 2
ELECTRICAL ADJUSTMENTS
2-1. ELECTRICAL ADJUSTMENTS
RF PLL Adjustment
1. Perform adjustments in the order given.
2. Use YEDS-18 disc unless otherwise indicated.
Procedure:
fri equency coun ter
digital board [
—— ee,
TP (PLCK) 0=———_O
TP (GND) o-——o
3. Use the oscilloscope with more than 10 MQQ im-
pedance.
1. Connect main board test point ASY and GND.
| Adjustment Mode
1. Connect digital board test point ADJ and GND.
This is to prevent the disc table from opening
2. Connect the frequency counter to main board test
points TP PLCK and TP GND.
3. Turn POWER switch ON (stop mode).
. Adjust digital board RV201 so that reading on
frequency counter is 4.3218 MHz +3 kHz.
even though pits are not read, by making micro-
computer [C301 pin 68) low.
2. Turn POWER switch on.
(To reset microcomputer.)
5. Reconnect lead wires connected in adjustment
mode.
. Put disc (YEDS-18) in and press ® PLAY button.
After adjustment, remove the lead wire connecting
test points ADJ and GND.
Adjustment Location: digital board : ; .
J pais a ai . Confirm that reading on frequency counter is
4.3218 MHz.
Adjustment Location: digital board
test point ADJ
(Connect the lead wire from
this test point to GND.)
TP
(PLCK)