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8-3.
SD Free-Running Frequency Adjustment
8-3-1.
Adjustment Procedure
Tools/Fixtures
• Oscilloscope
TEKTRONIX TDS510A or equivalent
• Frequency counter
ADVANTEST TR5821 or equivalent
Preparations
1.
Turn off the power of the unit.
2.
Remove the bottom plate assembly. (Refer to Section 6-4.)
3.
Connect an oscilloscope and a frequency counter to the unit.
PDW-HD1550
TP2802
(HPR-55 board)
Connection diagram
4.
Turn on the power of the unit and the tools.
Note
Apply power to the unit and the tools to allow warm up of 10 minutes or longer.
SD Free-Running Frequency Adjustment
1.
Set an oscilloscope as follows.
CH-3: DC 2 V/DIV
TIME: 100 µs/DIV
2.
Display the maintenance menu. (Refer to 4-1-2.)
3.
Select "SD 27MHz VCO".
Menu hierarchy
[M1 : ADJUST]
[A2 : AUDIO/VIDEO/BATTERY]
[A23 : CP VR]
[HD 74MHz VCO]
[SD 27MHz VCO]
The SD 27 MHz VCO ADJUST menu appears.
MAINTENANCE MENU
M1:ADJUST
A2:AUDIO/VIDEO/BATTERY
A23:CP VR
HD 74MHz VCO
SD 27MHz VCO
PDW-HD1550
Oscilloscope
Frequency counter
CH-3
CH-3
INPUT
IN
OUT
MAINTENANCE MENU
SD 27MHz VCO ADJUST
80
PRESET : 80
INC/DEC : CTRL.KNOB
TO MENU :
(HEX)
MENU KEY
8-5
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