JVC GY-DV500U - Gain (Sensitivity) Adjustment

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3.7 DV ADJUSTMENTS (USING ADJUSTMENT SOFTWARE)
3.7.1 Precautions
(1) The adjustments of the DV circuit (VTR Unit) of this model
require a PC. These adjustments are necessary after replace-
ment of the following parts.
• EEPROM (IC103 on DV Main board)
• Mechanism parts
In case of a problem with the electrical circuit, be sure to
identify the point of the trouble first by using measuring in-
struments. Do not proceed to repair, replacement or adjust-
ment unless the location of the trouble has been identified.
(2) When observing a TP on a chip, avoid applying stress by
using an IC clip, etc. In order to prevent the pattern from
being peeled off when replacing a chip part, particularly in
the case of an IC, remove the solder completely before re-
moving the part.
(3) The connectors tend to be broken easily. Be careful when
unplugging or plugging a wire.
(4) Before starting any adjustments, be sure to save the
EEPROM data in a PC file for use as backup data in case of
an adjustment failure (see section 3.7.12).
(5) When the adjustment software is run, a tape can be recorded
even if its REC SAVE tab is set to “SAVE”. Be careful not to
record anything onto an alignment tape by mistake.
(6) When the adjustment software is run, the operations per-
formed on the main unit do not cause the VCR Unit to func-
tion accordingly.
(7) When loading a tape into the GY-DV500, at the same time
the power is turned on while the tape is loaded, the unit
automatically enters the REC PAUSE mode. To cancel the
REC PAUSE mode, press the STOP buttons both of the main
unit and of the adjustment software.
(8) When the adjustment software is run, set the Menu switch
“VIDEO 126 :INPUT SELECT” to “IEEE1394” . (Only U-ver.)
3.7.2 Equipment Required for Adjustments
1
PC (Windows machine. Recommended CPU: Pentium 133
MHz or more)
2
Color TV monitor
3
Oscilloscope (2-trace, 100 MHz or more)
* 300 MHz or more recommended.
4
Digital voltmeter
5
Frequency counter (with threshold level adjustment)
6
Tape for use in recording/playback (JVC ME60)
7
Cleaning tape
3.7.3 Setup for PC Adjustment
Note: This switch is not used with the adjustments of the GY-
DV500.
Adjustment software
RS-232C port
PC cable
QAM0099-001
PC
JVC
MENU
CN1004
DV MAIN PWB
<JLIP>
Switch
(Note)
Connector cable
VCO DC
FS PLL
HID
A GND
ENV OUT
Fig. 3-7-1 Setup for PC Adjustment
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