Sony WLL-CA55, Руководство по обслуживанию

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2-3 (E)
WLL-CA55
CH2
IN IN
Oscilloscope
Frequency
counter
Probe
CH2
OUT
2-3. 27 MHz Free-run Adjustment
2-3-1. DPR-255 Board
Tools
.
Oscilloscope: Tektronix TDS3054B or equivalent
.
Frequency counter: Advantest R5362B or equivalent
. Extension board: EX-819
(Sony Part No.: A-8327-481-A)
Preparations
1. Set the DC LINE switch of the unit to OFF, and extend
the DPR-255 board using the EX-819 board.
(Refer to the steps 1 to 3 of Section 1-14.)
n
If the camera is connected to the unit, set the power
switch of the camera to OFF, too.
2. Only set the DC LINE switch of the unit to ON, and
warm up the unit for about ten minutes.
3. Connect the TP101 on the DPR-255 board to the GND
E2 on the EX-819 board.
4. Connect each equipment as shown in the figure.
Adjustment Procedure
Equipment: Frequency counter
Test Point: TP103/DPR-255 board
GND: E2/EX-819 board
Adjustment Point:
1
RV101/DPR-255 board
Specifications: 27.0
±
0.1 MHz
Setting after Adjustment
Restore the DPR-255 board to the original position.
DPR-255 BOARD (A SIDE)
TP101
TP102
TP103
TP301
S201
RV101
RV301
RV401
A
BC
1 2 3
TP201
TP202
TP203
TP204