Sony PXW-X500, Service Manual

Page: 22 / 184

AGC/LIM Specification
.
AGC/LIM Specifi cation
0
_
10
_
20
_
40
_
30
_
50
_
60
_
70
0
+
10
+
20
_
10
_
20
_
30
_
40
_
50
_
60
_
70
_
6dBFS
_
9dBFS
_
15dBFS
_
12dBFS
_
17dBFS
INPUT [dBFS]
OUTPUT
[dBFS]
_
8.1
dB
F
S
_
11
.4
dB
F
S
_
14.6
dB
F
S
_
17.9
dB
F
S
_
20.0
dB
F
S
Output level at 0dBFS input.
Subthreshold level
_
5.4dBFS max
_
8.4dBFS max
_
11.4dBFS max
_
14.4dBFS max
_
16.4dBFS max
_
4.8dBFS max
_
7.8dBFS max
_
10.8dBFS max
_
13.8dBFS max
_
15.8dBFS max
0dBFS
Features of the AGC/LIM OFF.
: Features in common of the MIC/LINE input.
Max input level
of the LINE input.
Max input level
of the MIC input.
1-2-7. Power Supply Block
RE-326 Board
This board switches input power, monitors and protects input voltages, and supplies power voltages.
The power control microcomputer (IC5002/DPR-362 board) controls boot, shutdown, and output sequences.
Input power (UNREG) block operation
When the input power (UNREG) is input, the camera unit enters the boot standby state. Power switch ON or OFF status
can be recognized in this state. When the power control microcomputer recognizes power switch ON, the UNREG power
in supplied to the power circuits and each output is activated by the signal from the power control microcomputer.
The normal value of the input power (UNREG) is within a range of approx. +10.5 to +17 V.
• Switching battery and EXT-DC
There are two types of input power: battery power and EXT-DC power. These input voltages are monitored and
are automatically switched placing a high priority on EXT-DC.
• Input overvoltage protection
When an UNREG voltage exceeding approx. +18.6 V is input, the overvoltage protection circuit is activated to
shut down the camera unit.
• Input constant-voltage protection
When the input UNREG voltage lowers below approx. +10.5 V, the power control microcomputer shuts down the
camera unit.
• Overcurrent detection
IC107 detects the input current. When the input current exceeds approx. 12 A, the overcurrent protection circuit is
activated to shut down the camera unit.
• Incorrect-power connection protection
When a reverse voltage is input, Q104 on the RE-326 board is not turned on and the protection function is activated
to block the current path.
PXW-X500
1-12