IFR FM/AM-500, Руководство по обслуживанию

Страница: 155 / 320

5. Remove screw (24) and lock washer (23) attaching mounting
bracket ( F i g u re 6-7, I t em 2 7) to ch ass i s ( 3 3 ) •
6. Remove eight screws ( 17) attaching Rear Panel (48) to chassis
( 33).
7. Remove two thumbnuts ( 1 1 ) securing fuse protector ( 7) and
remove fuse protector.
8. Withdraw Rear Panel Assembly (48) from chassis ( 3 3).
9. Disconnect wire harness connector from Power Supply PC Board
( 5) •
10. Unsolder black wire from fuseholder (Figure 6-7, Item 25).
11. Remove nut (Figure 6-7, Item 21) and terminal lug (Figure 6-7,
Item 22) attaching white wire to voltage select switch (Figure
6-7, It em 2 0) •
B. Disassembly (Figure 6-7)
1. Remove Transformer ( 13).
a. Remove screw (7) and lock washer (6) attaching Powe� Supply
PC Board (32) to Rear Panel (8).
b. Tag and unsolder all wires from transformer (13) to Power
Supply PC Board (32).
c. Tag and unsolder three wires from transformer (13) to volt­
age select switch (20).
d. Unsolder wire from External DC Power jack (1) to torroid
coil (18).
e. Remove four screws (16), three lock washers (15), four flat
washers (14) and grounding lug (17) mounting transformer
(13) on rear panel (8).
2. Remove power source control components.
a. Tag and unsolder all wires from voltage select switch (20).
b. Tag and unsolder all wires and capacitor lead from fuse­
holder (25).
c. Remove two nuts (21), lock washer (19), terminal lug (22),
if installed, and screws (30} attaching fuseholder (25} to
mounting bracket (27).
d. Identify and unsolder torroid (33) and capacitor (11, 12)
leads from AC connector (9).
6-17