Yaesu FT-736R Manual

FT-736R
TECHNICAL SUPPLEMENT
YAESU MUSEN CO., LTD.
c.P.0. BOX 1500
TOKYO, JAPAN

FT-736R TECHNICAL SUPPLEMENT
This manual is intended to serve as a supplement to the FT-736R Operating Manual. Detailed
information regarding functions, installation, interconnections and operation has been provided
in the Operating Manual, and is not reprinted herein. Therefore, this supplement is not
intended to serve as an independent reference, but to be used in conjunction with the infor-
mation provided in the Operating Manual.
Because there are nearly five hundred semiconductor devices in the FT-736R, circuit descrip-
tion information is provided in the form of numerous block diagrams. We hope that this
manner of providing functional information proves to be more convenient for the owner and
technician than would a lengthy verbal description. Those readers unfamiliar with the basic
types of analog and digital circuits that serve as the building blocks of the FT-736R are
encouraged to study instructional material, such as that provided in handbooks on amateur
radio and digital circuit design, before attempting to understand the design of the FT-736R.
Each block in the block diagrams represents one such basic circuit, while the Component
Applications List provides additional details for each semiconductor. General information on
integrated circuits and their applications is available in the data provided by the IC manufac-
turers. Specific circuit details are provided in the schematic diagrams in this manual.
While we believe the technical information in this manual is correct, Yaesu assumes no
liability for damage that may occur as a result of typographical or other errors that may be
present. Your cooperation in pointing out any inconsistencies in the technical information
would be appreciated.
Yaesu Musen reserves the right to make changes in the circuitry of this transceiver, in the
interest of technological improvement, without obligation to notify owners or to modify any
sets produced prior to the modification.

CONTENTS
a
CIRCUIT BOARD ACCESS
RX UNIT PARTS LAYOUT-------
RX UNIT CIRCUIT DIAGRAM -
TX UNIT PARTS LAYOUT -----
TX UNIT CIRCUIT DIAGRAM --
AF UNIT PARTS LAYOUT/CIRCUIT DIAGRAM-:--
144MHz MAIN UNIT PARTS LAYOUT ----
144MHz MAIN UNIT CIRCUIT DIAGRAM -
430MHz
RF
UNIT
PARTS
LAYOUT
-------
13
430MHz RF UNIT CIRCUIT DIAGRAM ----
430MHz PLL UNIT PARTS LAYOUT -
430MHz PLL UNIT CIRCUIT DIAGRAM
a
CNTL UNIT PARTS LAYOUT -:-- 18 4
CNTL
UNIT
CIRCUIT
DIAGRAM
-
20
DISPLAY,
REG
and
PROTECTOR
UNIT
PARTS
LAYOUT
-
21
DISPLAY
CIRCUIT
DIAGRAM
-ssrs+sesssessesseessessees
23
SW,
ENCODER
and
VR
UNIT
PARTS
LAYOUT
-
24
CONNECTION
DIAGRAM
----
BLOCK DIAGRAM ©»
SIGNAL TRACING (SSB MODE)
SIGNAL TRACING (CW MODE) -
SIGNAL TRACING (FM MODE) ----
SEMICONDUCTOR CROSS-REFERENCE -
EXPLODED VIEW -- :
50MHz
BAND
MODULE
(FEX-736-50)
OPTION
-
33
220MHz BAND MODULE (FEX-736-220) OPTION - 39 i
1200MHz BAND MODULE (FEX-736-1.2) OPTION -- 45 |
LEVEL
DIAGRAM
(144MHz
RX)
-*--
51
H
LEVEL
DIAGRAM
(430MHz
RX)
52
as
LEVEL DIAGRAM (144MHz TX) -
LEVEL DIAGRAM (430MHz TX)
ALIGNMENT
ALIGNMENT
ALIGNMENT (Transmitter)
ALIGNMENT (Receiver) ----
ALIGNMENT (FEX-736-50) -
ALIGNMENT (FEX-736-220) --
ALIGNMENT
(FEX-736-1.2)
--
i
PARTS LIST sstssassvessensvessssvssccsasssacunss eueeng es pes seneaabegsieaass ty sovesa ta sae teep putas Gadey 81 i
H
Tor nn a nn en ne nen FL

CIRCUIT BOARD ACCESS
TOP COVER
The
following
units
(pcb's)
are
accessed
by
me
=
removing
the top
cover:
t*
=
TX Unit -
144
MHz
Main
Unit
=
144
&
430
MHz
PA
Units
ro
*
430
MHz
PLL
Unit
3
430 MHz RF Unit
430 MHz Front End Unit
AF Unit
Protector Unit
% of RX Unit
ac
To remove the top cover, remove the eight
—
screws
(4
each
marked
"
%&"
or
"
%")
in
Figure
1
Figure 1). Then lift the cover off slowly so
as not to stress the loudspeaker wires.
Unplug these wires from J3016 on the RX
Unit before pulling the cover away.
RX UNIT
144MHz PA UNIT
PROTECTOR UNIT
“w¥4MHz MAIN UNIT
430MHz FRONT UNIT
430MHz PA UNIT
TX UNIT
Ht
| 430MHz PLL UNIT
AF IT
a
430MHz
RF
UNIT
Figure 3

CIRCUIT BOARD ACCESS
BOTTOM COVER
Removing the bottom cover exposes the
following units:
Power Supply Unit
Reg Unit
Optional Band Modules
% of RX Unit
To remove the bottom cover, remove the
twelve screws (4 marked " 3%" and 8 marked
"©") in Figure 1).
FEX-736-1.2
FEX-736-50
POWER
SUPPLY UNIT
= 7 =
Figure 4 TOT
FRONT PANEL HINGE
When the top and bottom covers have been
removed, the front can be slid forward and
folded down after loosening the two screws
on either side, shown in Figure 5. This
provides access to the following boards:
Control Unit
Display Unit
VR-A, -B, -C and -D Units
SW-A, -B and -C Unit
Encoder Unit
CNTL UNIT
ROTARY ENCODER
‘VR-D UNIT
VR-B UNIT
Sw-B
VR-A
ENCODER
SW-A
VRC DISPLAY UNIT
SW-C
Figure 6

Component side
Component side
x
x
x
3 3
&
RX UNIT

» (reverse)
RX UNIT PARTS LAYOUT
os
.
=
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uPC1037H(Q3003,3046)
uPC577H(Q3021)
LA6324M(Q9301,9401)
jar GATE?
mH [SOURCE CRAIN
2a
=
Ww
MC145163SL(09801) 2SK125(03006) 3SK74L(03032,3036)
ae ee (CATHODE ‘ANODE 1/CATHODE 2
>
4 aT TE f NOE j CATHODE |
Marked surface Marked Surtace Marked Surtace
2SC2619F (FB) (09802,9803) 1SS184(B3) (09301,9401) 1SS226(C3) (09302)
2SC2712GR(LG)
(Q9001,9003,9005)
FAIA4M(L33) (Q9402,9403)
FA1F4N(L35) (09002,9004)
13MHz RX PLL UNIT
SB SCAN UNIT
©® @®@® ® ® D®@®D wm %
Solder
side
(obverse)
Solder
side
(obverse)
FM SCAN UNIT (No. 94X X) 13MHz RX PLL UNIT (No. 98x X)
OQ9@QG ® @@® @ ®B
Solder
side
(obverse)
Solder
side
(obverse)

RX UNIT PARTS LAYOUT
ibs
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Z
&
Is
ooor” | wp
o=s(a
o
as

COLLECTOR EMITTER
COLLECTOR ie, /
— ~ EMITTER BASE- GATE
2SA460B(03002,3044)
BA1A4M(Q3030)
2SK241GR
2SA733AP(03055) BAIA4P (Q3007,3008,3049)
2SC458C 03024-3027,3040,3041
03010-3013,3016-3018 ( 3054,3056 )
3020,3022,3023,3028 BAIL4L
3029,3031,3033-3035 (03042-3045)
3037-3039 BN1A4P(03047,3048)
2SC535B
(Q3001,3005,3009,3019)
RX UNIT VOLTAGE CHART Y
(DC VOLTS)
RX UNIT IC VOLTAGE CHART (0c voLTs)
it side (reverse)
= =

“03 aoz
28C2619F x2
RX PLL UNIT
F2892109 (Na98xx)
aa
i
DHODOOS
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Sh Gbrede FR BESES
3