Sony XDCAM EX PMW-EX30, Руководство по обслуживанию

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1-13
PMW-EX30
.
Overcurrent detection
The overcurrent detection circuit is comprised of IC1504. The setting value is approximately 4.3 (A).
Even after clearing IC1504 after overcurrent detection, automatic recovery is not performed and the
power must be turned on again.
.
Power supply reverse connection protection
If the input power has reverse voltage, Q1501 on the AVP-11 board is immediately turned off and
UNREG power is stopped on the GND side, and the protection function works.
(2) DC/DC converter function
The power supply output is divided into 18 systems, which are separated into three blocks as seen below.
.
Audio/video signal system, 7 systems: (
+
13.5 V,
_
4.6 V,
+
4.6 V, etc.)
.
System controller system, 5 systems: (
+
4.6 V,
+
3.1 V,
+
2.5 V, etc.)
.
Media recording/playback system, 6 systems: (
+
3.1 V,
+
2.5 V,
+
1.8 V, etc.)
The sequence control (powering up and powering down) for the power supply system is controlled by the
POWER SUPPLY MICON (IC2002) for the respective power supply blocks of each block.
.
Short-circuit protection for each power supply system
The circuit settings monitor each output voltage or current for each power supply system and operate
the protection circuits per block.
Even after short-circuit is cleared, the protection circuit does not recover automatically and the power
must be turned on again.
1-8. Service Tools/Measuring Equipment List
1-8-1. Service Tools
Part No. Name Usage/Note
*
Mini USB cable For fi rmware version-upgrade
*
: This cable is supplied with this unit.
1-8-2. Measuring Equipment
Use the calibrated equipment or equivalent as listed below for the adjustments.
Equipment Model name
Oscilloscope Tektronix TDS3054 or equivalent (150 MHz or more)
HD waveform monitor LEADER ELECTRONICS LV5152DA or equivalent
Frequency counter Advantest TR5821AK or equivalent
Color monitor Sony HDM-20E1U/14E1U/14E5U or equivalent
HD signal generator Tektronix TSG700 or equivalent