____ discrete is generated by the brightness knob.
(6) Low voltage power supply (Ref. Fig. 024) Low voltage power supply consists of two parts:
-
the first one provides an intermediate pre-regulated 40 V voltage
-
the second one provides, via two parallel transformers, all the necessary voltages to the different modules of the DU:
-6.3 V CRT
25 V VHV
5 V Symbol generator
-170 V |
100 V |
+34 V |
-34 V |
+17 V | Analog board
-17 V |
+15 V |
-15 V |
This structure permits the use of small size transformers, the second part operating from a constant input voltage and thus minimizing the filtering components.
1EFF : 106-149, 303-399, 1 31-63-00Page 72 1 1 Config-3 Aug 01/05 1 1 1CES 1
Low Voltage Power Supply - Block Diagram
Figure 024
1EFF : 106-149, 303-399, 1 31-63-00Page 73 1 1 Config-3 Aug 01/05 1 1 1CES 1 (7) DU reactions to power interrupts
-------------------------------------------------------------------------------| POWER INTERRUPT | CONSEQUENCE | |------------------------|----------------------------------------------------| | t < 2.5 ms | No effect | |------------------------|----------------------------------------------------| | | . LV power supply restarts within 200 ms. | | 2.5 ms < t < 3 s | . VHV power supply restarts within 300 ms after | | | recovery of LV power (= 500 ms global). | | | . Masks RAMs may be lost. | |------------------------|----------------------------------------------------| | 3 s < t < 11 s | . Same as above, plus : | | | . All RAM contents may be lost. | |------------------------|----------------------------------------------------| | t > 11 s | . Same as above, plus : | | | . Cathode heating temporization (about 12 seconds).|
NOTE : In any case, the DU is able to dialogue with the DMC as soon
____ as the LV power supplies are available, i.e. 200 ms after the main power is on.
1EFF : 106-149, 303-399, 1 31-63-00Page 74 1 1 Config-3 Aug 01/05 1 1 1CES 1
DISPLAY MANAGEMENT COMPUTER (DMC) - REMOVAL/INSTALLATION
________________________________________________________ TASK 31-63-00-040-001 Deactivation of the DMC (1WT1/1WT2/1WT3)
1.
Reason for the Job
__________________
Self Explanatory
2.
Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific circuit breaker(s) safety clip(s)
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
31-63-00-440-001 Reactivation of the DMC (1WT1/1WT2/1WT3)
(Installation of the DMC3 in its initial position) 31-63-34-000-001 Removal of the DMC (1WT1,1WT2,1WT3) 31-63-34-400-001 Installation of the DMC (1WT1,1WT2,1WT3)
3. Job Set-up
__________ Subtask 31-63-00-860-050
A. In the subtask 31-63-00-865-05000-001, open the circuit breakers related to the DMC 3 then open the circuit breakers related to the defective DMC only (DMC 1 or DMC 2).
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 31-63-00Page 401 1201-299, 301-302, 1Config-1 May 01/05 1 1 1CES 1 Subtask 31-63-00-865-050
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 1WT1
49VU EIS/DMC1/SPLY 10WT1 E11 49VU EIS/DMC1/SWTG 21WT1 E09
FOR 1WT2 121VU EIS/DMC2/SPLY 10WT2 Q08 121VU EIS/DMC2/SWTG 21WT2 R08
FOR 1WT3 49VU EIS/DMC3/SWTG 21WT3 E07 121VU EIS/DMC3/SPLY 10WT3 Q09
4. Procedure
_________
Subtask 31-63-00-020-050
A. Deactivation of the DMC
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：A320飞机维护手册 AMM 指示/记录系统 7(156)
