Service manual

KB2LJJ Radio Mods Database and Manuals
Just to the right of a chip labeled XRU4066BCF and just to the left of two green wires (B2 & B3 which are draped over the board to the rear)
are two zero-ohm SMT resistors, B0 and B1, marked "000".
Remove B0. (the one on the left - furthest from the green wires)
Taking it out might be a bit tricky. It's glued down for surface-mount assembly. Be careful not to pull the trace from the board.
Perform a CPU reset by holding [MR] while turning on the radio.
It will then ask if it is "OK?" to reset, press [MR] again.
The ranges after modification are as follows:
Tx: 136-174 410-470
Rx: 118-174 300-470
The cellular band is indeed missing.
ONLY Removing Jumper 1 (B2) is the MARS/CAP modification.
** Diagram of specified area on Control Board **
EDGE OF BOARD, viewed from the rear, looking toward front panel
Green jumper wires (B2, B3)
_______ ___ ___ ___ ___ ___
-| |- | _ | | _ | |_ _| |_ _| |___|
-| XRU |- B0| | B1| | B2 | B3 |
-| 4066BF|- |_| |_| _|_ _|_ ___
-| |- |___| |___| |___| |___| |___|
-| |- _______
-| |- -| |-
-|_______|- -| |-
-| |-
-| |-
-| |-
-| |-
-|_______|-
The jumpers are actually soldered on the other side of the board, but the loops come up over the top and hang over the B0/B1 side.
B0=R414
B1=R412
Here's something interesting! According the Kenwood rep I spoke to, performing this mod *does not* void your factory warranty. The same
goes for any Kenwood published service bulletin or modification info. We are encouraged to perform the repairs ourselves to save them the
trouble and expence.
19-07-1998
DTMF Remote via Microphone
The TM-733 is fully DTMF remotable via the microphone (documented). The radio can also be externally DTMF controllable with an HT, but
that will be described later.
The DTMF control keys are exactly as shown on page 81 of the manual. Note that the microphone is active all the time, so any ambient DTMF
tones near your mic will also change rig settings. This includes tones coming in on the other band and out the speaker.
Cross Band Repeating
Cross band repeat isn't documented but comes ready from the factory.
To enable cross band repeat from the front panel, first select a band by pressing BAND SELECT. Then, change the control to the other band
by hitting [CONT SEL]. Next, press [F] for one second, then the "X" button (far right side). Decimals will appear between the Kilohertz digits,
and the "ON" indicator will light momentarily. The microphone sequence to enable cross band repeat while in remote control mode is "DC".
The transmitter hang time can be toggled between 500ms to 0ms by turning on the radio with [LOW] pressed. They also recommend enabling
the Time-out Timer, for obvious reasons.
Note that the TM-733 can also be used as a "one-way" cross-band repeater.
For example, if you can receive a distant repeater with your HT, but have difficulty getting into it, you can use the TM-733 to boost your
transmitted signal. To set this up, just omit the part where you "change the control to the other band by pressing [CONT SEL]." Doing this will
setup the TM-733 to repeat your signal to the other band, but will not retransmit the distant station back to you. If this sounds ambiguous, play
around with it a little and it will begin to make sense.
http://www.kb2ljj.com/data/kenwood/TM-733.htm (6 di 9)30/08/2009 18.42.07