Triax Transmission System Adjustment; Mhz Modulation Circuit Adjustment - Sony HXC-100 Service Manual

3-8. TRIAX Transmission System Adjustment

3-8-1. 1.4-MHz Modulation Circuit Adjustment

Frequency Adjustment
Preparations
. Supply the DC IN connector with external power (+12 V).
. Set the CAMERA POWER switch to EXT.
. Disconnect the INTERCOM connector.
Adjustment
1. Connect the frequency counter to the following terminals on the TX-126 board.
Test Point: TP1 (B-1)
GND: E2 (A-2)
2. Adjust the LV1 (B-2) on the TX-126 board so that the frequency counter shows 1.4 ?0.001 MHz.
Dev Adjustment
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Before starting this adjustment, check that the CCU demodulation circuit adjustment (DPR-300 board) has been completed.
Preparations
. Connect the camera to the CCU with the TRIAX cable.
. Set the power switches as follows.
Camera: OFF
CCU: ON
. Set the line selection switch on the intercom panel to ENG.
. Menu setting
MENU: OPERATION
PAGE: HEAD SET
ITEM: INTERCOM MIC → MANUAL
LEVEL → _20 dB
POWER → OFF
UNBAL → OFF
. Input the audio signal (1 kHz, _20 dBu) into the INTERCOM connector.
Adjustment
1. Connect the oscilloscope to the following terminals on the DPR-300 board in the CCU.
Test Point: TP1503 (E-6)
GND: E1501 (F-6)
2. Adjust the RV1 (B-1) on the TX-126 board so that the amplitude level becomes 220 ?10 mVp-p.
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HXC-100/V1 (E)