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4.1
EQUIPMENT NECESSARY FOR ADJUSTMENT
Instrument
Frequency counter
JIG board
Connecting cable
Battery (Recommended)
SD card
4.2
27MHz ADJUSTMENT
When the CODEC Board is replaced, this adjustment is required.
4.2.1 Connection
Connect the JIG board, connecting cable,
• The GY-HD200/250 series supplies power only by the battery. And, after it charges it full, the battery is adjusted.
• As for the GY-HM700 series, the supply from the DC power supply is possible.
*1 NOTE:
Please connect it so as not to damage 1 pin and 20 pins of CN24 on the CODEC board when the cable is connected while keeping
the connector parallel.
4.2.2 Adjustment procedure
Measuring point
Adjustment level
(1) While pressing the [ ] button and the [INFO/CLR] button, press the [MENU] button to display the adjustment menu screen.
(2) Select [AJUST] using the [ ] button.
--AJUST---
> PLL
(3) Press the [
] button.
(4) Change the value using the [ ] or [ ] button to adjust the frequency of TP1 on the JIG board to the adjustment level.
PLL
> ADJUST 130
27 0000
MHz > 128
(5) Press the [
] button to set the adjustment result.
(6) Press and hold the [POWER] button for more than one second to turn the power OFF.
SECTION 4
ADJUSTMENT
Condition and part number
Readable in 8 or more digits, and must be calibrated. Constancy of 0.1ppm/1 x 10
at 0ºC to 40ºC.
Part number: KSJ1705
Part number: KS44291
U Model: Anton Bauer Dionic90
E Model: IDX Endura-7
Minimum 16 MB or more
*1
and the frequency counter as shown in the figure below.
TP1 on the JIG Board
27MHz ± 15Hz (26.999985MHz to 27.000015MHz)
128
129
127
126
-7
or more
(No.HC027<Rev.001>)1-9
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