Connecting Diagram; Board, Oscillating Frequency Adjustment - Sony SX-M700 Service Manual

5-3. CONNECTING DIAGRAM

Oscillator
1 kHz
. Connect 1 kHz audio signal to any of EXT IN-1 MIC, EXT IN-2 MIC, EXT IN-1 LINE IN, EXT IN-2
LINE IN, pin-10 of DELEGATE'S/CHAIRMAN'S UNIT 1 to 4, or pin-1 of TELEPHONE
COUPLER.
(Input level is about _60 dBs when connecting to EXT IN-1/2, or about _10 dBs when connecting to
other inputs.)
5-4. PS-364 BOARD, OSCILLATING FREQUENCY ADJUSTMENT
Conditions for adjustment
. Set RV901 (D-3) on the PS-364
board to mechanical center.
. Connect a frequency counter to
the measurement point.
. Turn on the main power.
5-2(E)
PUSH
Specifications
. Measurement point: TP903 (D-4)/PS-364 board
. Adjust RV901 so that the switching frequency satisfies the
specification.
Frequency
RV901
low
Switching frequency : 100
1 RV901 (D-3)/PS-364 Board
high
±
1 kHz
Adjustment point
SX-M700