Sd Free-Running Frequency Adjustment - Sony PDW-HD1500 Maintenance Manual

8-3. SD Free-Running Frequency
Adjustment
Tools/Fixtures
. Oscilloscope:
TEKTRONIX TDS460A or
equivalent
. Frequency counter: ADVANTEST TR5821 or
equivalent
Preparations
1. Turn off the power of the unit.
2. Remove the bottom panel. (Refer to Section 6-12-8.)
3. Connect an oscilloscope and a frequency counter to the
unit.
4. Turn on the power of the unit and the tools
PDW-HD1500 Oscilloscope
CH-2
TP3104
IN
(HPR-23 board)
Connection diagram
n
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-2: DC 2 V/DIV
TIME: 100 us/DIV
2. Display the adjustment item referring to Section 8-1-3.
3. Select "A23: CP VR" rotating the [PUSH|SET]
knob, and press the [SELECT] button.
4. Select "SD 27MHz VCO" rotating the [PUSH|SET]
knob, and press the [SELECT] button.
MAINTENANCE MENU
M1:ADJUST
A2:AUDIO/VIDEO/BATTERY
A23:CP VR
HD 74MHz VCO
SD 27MHz VCO
SDI ENC1 VCO
SDI ENC2 VCO
PDW-HD1500/V1 (E)
Frequency counter
CH-2
INPUT
OUT
The SD 27 MHz VCO ADJUST menu appears.
MAINTENANCE MENU
SD 27MHz VCO ADJUST
preset : 80H
7A(HEX)
INC/DEC : CTRL.KNOB
TO MENU : MENU KEY
5. Perform the adjustment by rotating the [PUSH|SET]
knob so that a frequency counter reading satisfies the
specification.
Measurement Point: TP3104/HPR-23 board (C-6)
27.00000 ± 0.00005 MHz
Specification:
6. Press the MENU button to return to the [MENU]
screen.
7. Press the [RETURN] button.
8. Select "A2F: NV-RAM CONTROL" rotating the
[PUSH|SET] knob, and press the [SELECT] button.
9. Select "SAVE ALL ADJUST DATA" rotating the
[PUSH|SET] knob, and press the [SET] button to
save the adjustment data.
8-3