home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Hacker Chronicles 2
/
HACKER2.BIN
/
1165.SB931.DOC
< prev
next >
Wrap
Text File
|
1989-09-30
|
2KB
|
50 lines
SB-931
TM-721A Low/No VHF Transmit Power.....4-11-88
Some early model TM-721A transceivers may develop low or now
output power on the VHF band. This may be caused by coil
L6 or L9 on the final unit. The coils shuld be inspected
for burn marks on their insulation. If any flaw is detected
in the insulation , replace the coil with a wider spaced
coil.
Required Parts:
Coil, 9.5T L6,L9 Part # L34-1238-05
1. Disconnect the power supply and antenna from the
transceveiver.
2. Remove the top and bottom covers (12 Screws). Do not
damage the speaker wires when removing the top cover.
3. Remove the VHF Final unit shield (4 Screws) from the top
of the TM-721A.
4. Unsolder the Final module (Q1), antenna coax, and
terminal pin W4 from the Final board.
5. Unplug the wires at connectors CN2, CN3, and CN4 on the
VHF TX-RX unit (top side of the transceiver.)
6. Unplug the wires at connector CN10 on the UHF TX-RX unit
(bottom side of transceiver).
7. Remove the 7 screws from the VHF Final unit. Remove the
Final Unit from the transceveiver.
8. Unsolder and remove the coil(s) (L6 or L9). Install and
solder the new coil(s).
9. Assemble the transceiver by reversing steps 1-7.
This modification may be covered under warranty.
Time required for this modification is 1.0 Hr or less.
(c) 42588TKC