2-2. Circuit Description2-4. Circuit Protection Device
DA-126 boardThe DA-126 board is equipped with two positive ther-
The HD SDI signal input from DIF-62 board is convertedmistors F1 and F3 for +5 V and _5 V respectively. This
to 74-MHz, 20-bit parallel data by IC20. HD-H (horizontaldevice limits a current by steeply increasing the innner
sync signal) and HD-F (frame sync signal) are extracted byresistance when it rises to a certain temperature due to
a format decoder IC22. The Y signal is passed through aovercurrent or high ambient temperature. The device being
simple branking circuit and PB/PR signal is demultiplexed.activated, the indicator beside it will go out at the same
They are digital-to-analog converted respectively.time. If activated, turn off the power and check the unit.
The analog signal, Y/PB/PR is sent through a post filter, to aAfter the cause is eliminated and the device cools off, turn
matrix and selector circuits. The signal which was sent toon the power again. If there is no trouble, the unit will
the matrix circuit is converted to R/G/B signal. A selectoroperate normally.
circuit in the next stage selects the Y/PB/PR signal or R/G/B
signal according to the settings of switches S4 and S5.2-5. Note on Replacement of Electrical
Selected signal is outpout through the DIF-62 board.Parts
The DA-126 board is provided with a power circuit and
detection circuits to detect a field frequency (59.94 or 60.0)The DA-126 and DIF-62 boards are equipped with a high-
of input signal and the number of the active lines (1035/frequency circuit (1.5 GHz) in the shielding case on each
1080) in an image area. The power circuit consists of seriesboard. So every electrical part contained in the shielding
regulators of +4.5 V and _4.5 V and switching regulatorscase can not be replaced. If the high-frequency circuit in
of +3.3 V, +1.2 V and _2 V. EEPROM on this boardthe DA-126 board fails, please order the HKPF-102
stores the status previous to being powered off, such as thethrough the sales route for replacement. If that in the
active lines in an image area and the field frequency.DIF-62 board fails, replace the DIF-62 board itself.
DIF-62 board
The DIF-62 board has an input connector for the HD SDI
signal and output connectors for HD analog signal (Y/G,
PB/B, PR/R two each, and SYNC). It also has a cable
equalizer and clock recovery circuit of the HD SDI signal.
2-3. Optional Fixtures
DescriptionP/NRemarks
Extension board J-6185-960-A To extend DA-126 board
EX-331
IC extractorJ-6035-070-A To extract IC12/DA-126 board
(Usable for PLCC IC with pins
20 to 124)
2-2 (E)HKPF-102 |
ACEC
