(2)
Readout Lamp Removal Tool - Aero Products, P/N B6810-23
B. Remove Knobs and Panel Assembly
CAUTION: PANEL IS INTERNALLY LIT AND WILL HAVE TO BE REPLACED IF PAINT
_______ IS SCRATCHED. THEREFORE, DO NOT PRY KNOBS OFF USING A SCREWDRIVER.
(1)
Remove knobs by loosening hex set screws and lifting off switch shaft.
(2)
Loosen four captive screws.
(3)
Carefully lift panel assembly approximately one inch away from CDU.
CAUTION: DO NOT JERK OR TRY TO FORCE PANEL AWAY FROM CDU BECAUSE
_______ THE WIRES CONNECTED TO THE EDGE LIGHTING PLUG ARE SHORT, AND DAMAGE TO THE WIRES AND PLUG MAY RESULT.
(4)
Using fingers or 3/16-inch wide screwdriver blade, open clips that secure edge lighting plug and disconnect plug from panel.
(5)
Remove panel assembly.
C. Install Knobs and Panel Assembly
(1)
Place panel assembly over switch shafts.
(2)
Using fingers or 3/16-inch wide screwdriver blade, connect edge lighting plug to panel assembly receptacle, then lock clips.
(3)
Push panel assembly flush against front of CDU and align captive screws in panel assembly with matching holes in CDU.
(4)
Tighten captive screws.
CAUTION: DO NOT OVERTIGHTEN SCREWS BECAUSE PANEL MAY WARP OR BREAK.
_______
(5) Place knobs on switch shafts and tighten set screws just enough to prevent knob movement on shaft.
3. Relamp CDU Keys and Annunciators (Fig. 303 and 304 [ DELCO INS])
________________________________
(ATLAS ALL EXCEPT IB 406-499)
A. Equipment and Material
(1)
Lamp, 28 volts, 40 ma -- Type MS18209-387 (preferred) or MS25237-327
(2)
Lamp, 14 volts, 80 ma -- AC Electronics, P/N 7890382-001
(3)
Lamp, 6 volts, 200 ma -- Type MS25237-328
B. Replace Lamp
EFFECTIVITY
ATLAS ALL EXCEPT SN 15 Page 301 Jul 25/80
34-41-02
ALPHANUMERIC READOUT LAMP (6 PLACES)
ANNUNCIATOR
EW READOUT LAMP CAP (BATT) 5V BIPIN
NS READOUT LAMP ANNUNCIATOR CAP (ALERT) LAMP 28V DC LAMP (TYPICAL
FOR ALERT, BATT,
ALPHANUMERIC WARN ANNUNCIATORS)
READOUT LAMP (3 PLACES)
(5 PLACES)
ANNUNCIATOR ALPHANUMERIC
CAP (WARN) READOUT LAMP (2 PLACES) 5V AC LAMP (TYPICAL FOR KEYBOARD PUSHBUTTONS EXCEPT HOLD)
5V DC LAMP (TYPICAL
(11 PLACES) FOR TK CHG, HOLD,
EDGE
INSERT PUSHBUTTONS) PUSHBUTTON CAPLIGHTING
(3 PLACES)
PLUG TOP PANEL SWITCH SHAFTS
ASSEMBLY
BOTTOM PANEL ASSEMBLY
AUTO/MAN/RMT
SWITCH KNOB CAPTIVE SCREW AND BUSHINGS (4 PLACES)
DISPLAY SELECTOR SWITCH KNOB
LTN-72R Control Display Unit - Relamping Disassembly Figure 301
Readout Lamp Removal Tool
Figure 302
EFFECTIVITY
ALL 799 Page 302
34-41-02
Apr 25/81
(1)
Unfasten three clips on indicator access panel and remove panel (Fig. 303).
(2)
Pull annunciator lamp cover or key from socket.
(3)
Pull lamp from lamp cover or key.
(4)
Insert new lamp in lamp cover or key. See Fig. 304 for correct lamp size.
CAUTION: WHEN RELAMPING, USE CARE TO INSTALL CORRECT TYPE LAMP.
_______ ONLY 28-VOLT LAMPS ARE USED IN BATT AND WARN ANNUNCIATORS. FAILURE TO USE CORRECT BULB CAN CAUSE TRANSISTOR BURNOUT IN NAVIGATION UNIT.
(5)
Reinstall lamp cover or key.
(6)
Reinstall access panel and fasten three clips.
(7)
Perform step 10 (Test CDU Lamps)
4. Replace Pushbutton Lamps (LITTON INS) (IB 406-499)
________________________
A. Equipment and Materials
(1)
Lamp, 6V (used in all keyboard caps except TK CHG, HOLD and INSERT) TYPE 345-297 or GE No. 345.
(2)
Lamp, 6V (used in TK CHG, HOLD and INSERT caps only) -MS25237-328-297 or GE No. 328
B. Remove Pushbutton Caps and Lamps
(1)
Remove knobs and panel assembly.
(2)
Remove lens cap by pulling straight out.
NOTE: If lens cap is difficult to pull out, wrap a piece of
中國航空網(wǎng) www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747飛機維護手冊AMM CHAPTER 34 - NAVIGATION 第34章導航3(57)
