Audio System Adjustment; Rts Intercom Adjustment Check; Check (Prod Cancel) - Sony HXCU-100 Service Manual

6-2. Audio System Adjustment

6-2-1. RTS Intercom Adjustment Check

Precautions
. This adjustment is described on condition that the audio oscillator output impedance is 600 Z.
. Potentiometers RV530 and RV531 on the SY-364 board have been adjusted according to the customer's system. Check
this adjustment only when the system intercom output is repaired.
Preparation
. Extend the SY-364 board using an extended board.
. SY-364 board setting
S530 → RTS (CC)
S531 → RTS (CC)
. CCU menu setting
C06: ENGINEER → RTS
PRODUCER → RTS
C07: INCOM MIC → CARBON

Check (PROD CANCEL)

1. Set the INTERCOM switch on the front panel to
PROD.
2. Connect a 200-ohm resistor between pin e11 (CN1
side) and pin C10 of the extended board.
3. Input a sine wave (1 kHz, 220 mV p-p (_20 dBu)) to
pin 2 (X), pin 1 (Y), and pin 3 (G) of the INTERCOM
connector from the audio oscillator.
4. PROD CANCEL check
Equipment: Oscilloscope
Test Point: TP531 (C-4) /SY364 board
Adjusting Point: 1RV530 (PROD RTS CANSEL)/
SY-364 board
Specifi cation:
There must be a point where "A" becomes the mini-
mum within the range (60 degrees) shown in the
fi gure.
HXCU-100
L K J H G F
SY-364 BOARD (SIDE A)
Audio oscillator
600 Ω
GND
60º
30º 30º
SY-364 board
9
8
7
6
RV531 1
5
RV530 1
4
TP530 TP531
3
2
S531 S530
1
E D C B A
INTERCOM connector
(Front panel)
1
5
4 2
3
A
6-3 (E)