Yaesu FT-2900R Service Manual
VERTEX STANDARD CO., LTD.
4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, Japan
VERTEX STANDARD
US Headquarters
FM TRANSCEIVER
FT-2900R
Technical Supplement
©2009 VERTEX STANDARD CO., LTD. EH039N90A
10900 Walker Street, Cypress, CA 90630, U.S.A.
YAESU UK LTD.
Unit 12, Sun Valley Business Park, Winnall Close
Winchester, Hampshire, SO23 0LB, U.K.
VERTEX STANDARD HK LTD.
Unit 5, 20/F., Seaview Centre, 139-141 Hoi Bun Road,
Kwun Tong, Kowloon, Hong Kong
VERTEX STANDARD (AUSTRALIA) PTY., LTD.
Normanby Business Park, Unit 14/45 Normanby Road
Notting Hill 3168, Victoria, Australia
Introduction
This manual provides technical information necessary for servicing the FT-2900R FM Transceiver.
Servicing this equipment requires expertise in handling surface-mount chip components. Attempts by nonqualified persons to service this equipment may result in permanent damage not covered by the warranty,
and may be illegal in some countries.
Two PCB layout diagrams are provided for each double-sided circuit board in the Transceiver. Each side of is
referred to by the type of the majority of components installed on that side (“leaded” or “chip-only”). In most
cases one side has only chip components, and the other has either a mixture of both chip and leaded components (trimmers, coils, electrolytic capacitors, ICs, etc.), or leaded components only.
While we believe the technical information in this manual to be correct, VERTEX STANDARD 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.
Important Note
The transceiver was assembled using Pb (lead) free solder, based on the RoHS specification.
Only lead-free solder (Alloy Composition: Sn-3.0Ag-0.5Cu) should be used for repairs performed on this apparatus. The solder stated above utilizes the alloy composition required for compliance with the lead-free specification,
and any solder with the above alloy composition may be used.
Contents
Specifications ...................................................... 2
Exploded View & Miscellaneous Parts ............ 3
Block Diagram .................................................... 5
Connection Diagram .......................................... 6
Circuit Description.............................................7
Alignment ............................................................ 9
Board Unit (
MAIN Unit Circuit Diagram ................................. 13
MAIN Unit Parts Layout .......................................15
MAIN Unit Parts List ............................................ 17
CNTL Unit Circuit Diagram ................................. 27
CNTL Parts Layout ............................................... 28
CNTL Parts List .................................................... 29
Schematics, Layouts & Parts
)
1
Specifications
General
Frequency Range: Tx 144 - 146 MHz or 144 - 148 MHz
Rx 144 - 146 MHz or 136 - 174 MHz
Channel Step: 5/10/12.5/15/20/25/50/100 kHz
Standard Repeater Shift: ±600 kHz
Frequency Stability: Better than ±10 ppm [–4 °F to +140 °F (–20 °C to +60 °C)]
Modes of Emission: F2D/F3E
Antenna Impedance: 50 Ohms, unbalanced
Supply voltage: 13.8 V DC ±15%, negative ground
Current Consumption (typical): Rx: less than 0.7 A, less than 0.3 A (squelched)
Tx: 15 A (75 W) /9 A (30 W) /5 A (10 W) /4 A (5 W)
Operating Temperature Range: –4° F to +140° F (–20° C to +60° C)
Case Size (WxHxD): 6.3” x 2” x 7.3” (160 x 50 x 185 mm) (w/o knobs)
Weight (Approx.): 4.2 lb (1.9 kg)
Transmitter
Output Power: 75 W/30 W/10 W/5 W
Modulation Type: Variable Reactance
Maximum Deviation: ±5 kHz (Wide)/±2.5 kHz (Narrow)
Spurious Radiation: Better than –60 dB
Microphone Impedance: 2 k-Ohms
Receiver
Circuit Type: Double Conversion Superheterodyne
Ifs: 21.7 MHz & 450 kHz
Sensitivity (for 12dB SINAD): Better than 0.2 µV
Selectivity (–6/–60dB): 12 kHz/28 kHz (Wide)
9 kHz/22 kHz (Narrow)
IF Rejection: Better than 70 dB
Image Rejection: Better than 70 dB
Maximum AF Output: 3 W into 4 Ohms @10 % THD
Specifications subject to change without notice or obligation. Specifications guaranteed only within Amateur band.
Frequency ranges and functions will vary according to transceiver version; check with your dealer.
2
VXSTD P/N
AAA43X001
T9025825
Q0000074
S8002050
RA1119800
ACCESSORIES
DESCRIPTION
MICROPHONE (MH-48A6J
DC CABLE
SPARE FUSE (25 A
FOOT
BRACKET (MMB-83
)
)
Exploded View & Miscellaneous Parts
)
REF.
c
d
e
f
g
VXSTD P/N
U03310002
U24310001
U24308002
U30308007
U51320007
DESCRIPTION
SEMS SCREW ASM3X10NI
BIND HEAD TAPTITE-B M3X10
TAPTITE SCREW M3X8NI
FLAT HEAD SCREW M3X8B
HEXA SOCKET BOLT M3X20B
QTY.
4
5
11
6
3
Non-designated parts are available only as part of a
designated assembly.
CS2042401 TYP:A2
CS2042402 TYP:A1
CS2042403 TYP:A3
CS2042404 TYP:B1
CS2042405 TYP:B2
CS2042406 TYP:B3
FRONT PANEL ASSY
RA1148000
SHEET 45x5
RA0210600
RUBBER PACKING
g
RA1120700 (x2 pcs)
KNOB (VOL/SQL)
RA1131200
INTER CONNECTOR
S8002060
FILTER LCD
g
g
RA1120000
GROUND PLATE
CNTL UNIT
RA1105000
RUBBER KNOB
RA1104900
FRONT PANEL
RA1120800
ENCODER KNOB
CP9508001
BOTTOM COVER ASSY
T9207248
WIRE ASSY
G6090192
LCD
RA1113700
CHASSIS
d
RA1142100
GROUND PLATE
MAIN UNIT
d
d
S8002063
CAP-SP
S8002056
REFLECTOR
T9206438A
WIRE ASSY
f
RA1148000
SHEET 45x5
e
f
e
d
e
d
P1091172
CONNECTOR
G1094704
S-AV36A
RA0515300
SHIELD CASE
e
e
e
e
f
S8002087
NET-SP
e
e
RA0124501
SHIELD CASE
c
e
c
c
e
T9207482
WIRE ASSY
RA1150500
PORON SHEET (D20x2)
M4090178
SPEAKER
S8002088
FELT
f
f
f
RA1113800
BOTTOM COVER (H039)
c
3
Note
4
Block Diagram
5
Connection Diagram
6
Circuit Description
Receive Signal Path
Incoming RF signal is from the antenna jack is delivered to the Main Unit and passed through the lowpass filter network consisting capacitors C1213,
C1236, C1238, C1239, & C1241 and coils L1017, L1018,
& L1019, antenna switching diode D1020 and D1028
(both RLS135), and varactor-tuned band-pass filter
consisting of capacitors C1248, C1249, C1250, C1251,
C1252, & C1268, coils L1020, L1021, & L1024, and
diodes D1024 and D1025 (both HVC350B ), before
delivery to the RF amplifier Q1045 (3SK296ZQ). The
amplified RF signal is passed through the another
varactor-tuned band-pass filter consisting of capacitors C1198, 1199, 1200, & 1218, coils L1012 and L1015,
and diodes D1017 and D1021 (both HVC350B), then
applied to the 1st mixer Q1037 (3SK296ZQ) along
with the first local signal from the PLL circuit.
The first local signal is generated between 114.3 MHz
and 152.3 MHz by the VCO, which consists of Q1009
(2SC5231) and varactor diode D1002 (HVC350B) according to the receiving frequency.
IF and Audio Circuits
The 21.7 MHz first IF signal is applied to the monolithic crystal filters XF1001 and XF1002 which strip
away unwanted mixer products, and the IF signal is
applied to the first IF amplifier Q1032 (2SC4400).
The amplified first IF signal is then delivered to the
FM IF subsystem IC Q1028 (NJM2591V), which con-
tains the second mixer, limiter amplifier, noise amplifier, and FM detector.
The audio signal passes through a band-pass filter
consisting of Q1046 and Q1047 (both 2SC4081), and
the audio mute gate Q1039 (2SJ347), to the audio
VR which adjusts the audio sensitivity to compensate for audio level variations. The adjusted audio
signal is delivered to the audio amplifier Q1035
(LA4425A) which provides up to 3 Watts, to the external speaker jack or a 4-Ohm loudspeaker.
Squelch Control
When no carrier received, the noise signal from
Q1028 (NJM2591V) is amplified by Q1051
(2SC4617), and is detected by D1011 and D1013
(both DA221). The resulting DC voltage passes
through the SQL knob to main CPU Q2001
(HD64F2266TF13). While no carrier is received,
main CPU Q2001 (HD64F2266TF13) control Q1048
(CD4094BPWR), thus, audio mute gate Q1034
(2SJ364) and Q1039 (2SJ347) turns “OFF” to disable the audio output from the speaker.
Transmit Signal Path
The speech signal from the microphone is amplified
by Q1049 (LM2902PWR). The amplified speech signal is subjected to the low-pass filter network Q1049
(LM2902PWR) to deviation controlled by Q1043
(M62364FP).
The adjusted speech signal from Q1043 (M62364FP)
is delivered to VCO Q1009 (2SC5231) which fre-
quency modulates the transmitting VCO made up
of D1004 (HSC277).
The second local signal is generated by 21.25 MHz
crystal X1001, produces the 450 kHz second IF signal when mixed with first IF signal within Q1028
(NJM2591V).
The 450 kHz second IF signal is applied to the ceramic filter CF1001 (for Narrow FM) or CF1002 (for
Wide FM) which strip away unwanted mixer products to the ceramic discriminator CD1001 which removes any amplitude variations in the 450 kHz IF
signal before detection of speech.
The detected audio from the Q1028 (NJM2591V)
passes through the de-emphasis circuit consisting of
resistors R1082 & R1113, and capacitors C1120 &
C1122, to the audio mute gate Q1034 (2SJ364).
The modulated transmit signal passes through buffer amplifier Q1010 and Q1023 (both 2SC5374).
The transmit signal applied to the drive amplifier
Q1026 (2SC5226), then finally amplified by power
amplifier module Q1030 (S-AV36A) up to 75 Watts.
The APC circuit controls the Q1030 (S-AV36A) pow-
er amplifier’s gain.
The 75 Watts RF signal passes through low-pass filter network consisting of Capacitors C1210 and
C1211 and coil L1013, antenna switch D1018 and
D1019 (both L709CER), and another low-pass filter
network consisting capacitors C1213, C1236, C1238,
C1239, & C1241 and coils L1017, L1018, & L1019, and
then deliver to the ANT jack.
7
Circuit Description
TX APC Circuit
A portion of the power amplifier module output is
rectified by D1022 (1SS321), then delivered to APC
Q1038 (LM2904PWR), as a DC voltage which is pro-
portional to the output level of the power amplifier
module.
The APC Q1038 (LM2904PWR) is compared the rec-
tified DC voltage from the power amplifier module
and the reference voltage from the main CPU Q2001
(HD64F2266TF13), to produce a control voltage,
which regulates supply voltage to the power amplifier module Q1030 (S-AV36A), so as to maintain sta-
ble output power under varying antenna loading
condition.
PLL
A portion of the output from the VCO Q1009
(2SC5231) passes through the buffer amplifier
Q1010 and Q1017 (both 2SC5374), then delivered
to the programmable divider section of the PLL IC
Q1011 (MB15A01PFV1), which divided according
to the frequency dividing data that is associated with
the setting frequency input from the main CPU
Q2001 (HD64F2266TF13). It is then sent to the phase
comparator section of the PLL IC Q1011
(MB15A01PFV1).
The 21.25 MHz frequency of the reference oscillator
circuit made up of X1001 is divided by the reference
frequency divider section of Q1011 (MB15A01PFV1)
into 4250 or 3400 parts to become 5 kHz or 6.25 kHz
comparative reference frequencies, which are utilized by the phase comparator section of Q1011
(MB15A01PFV1).
The phase comparator section of Q1011
(MB15A01PFV1) compares the phase between the
frequency-divided oscillation frequency of the VCO
circuit and comparative frequency and its output is
a pulse corresponding to the phase difference. This
pulse is integrated by the charge pump and loop filter into a control voltage (VCV) to control the oscillation frequency of the VCO Q1009 (2SC5231).
8
Alignment
Introduction
The FT-2900R is carefully aligned at the factory for
the specified performance across the amateur band.
Realignment should therefore not be necessary except in the event of a component failure. Only an
authorized Vertex Standard representative should
perform all component replacement and service, or
the warranty policy may be void.
The following procedures cover the adjustments that
are not normally required once the transceiver has
left the factory. However, if damage occurs and some
parts subsequently are replaced, realignment may
be required. If a sudden problem occurs during normal operation, it is likely due to component failure;
realignment should not be done until after the faulty
component has been replaced.
We recommend that servicing be performed only by
authorized Vertex Standard service technicians who
are experienced with the circuitry and fully equipped
for repair and alignment. If a fault is suspected, contact the dealer from whom the transceiver was purchased for instructions regarding repair. Authorized
Vertex Standard service technicians realign all circuits and make complete performance checks to ensure compliance with factory specifications after replacing any faulty components.
Those who do undertake any of the following alignments are cautioned to proceed at their own risk.
Problems caused by unauthorized attempts at realignment are not covered by the warranty policy.
Also, Vertex Standard reserves the right to change
circuits and alignment procedures in the interest of
improved performance, without notifying owners.
Required Test Equipment
The following test equipment (and familiarity with
its use) is necessary for complete realignment. Correction of problems caused by misalignment resulting from use of improper test equipment is not covered under the warranty policy. While most steps
do not require all of the equipment listed, the interactions of some adjustments may require that more
complex adjustments be performed afterwards.
Do not attempt to perform only a single step unless
it is clearly isolated electrically from all other steps.
Have all test equipment ready before beginning and,
follow all of the steps in a section in the order presented.
RF Signal Generator with calibrated output level
at 200 MHz
Deviation Meter (linear detector)
In-line Wattmeter with 5% accuracy at 200 MHz
50-Ohm 100-W RF Dummy Load
8-Ohm AF Dummy Load
Regulated DC Power Supply adjustable from 9 to
16.5 VDC, 20A
Frequency Counter: 0.2-ppm accuracy at 200 MHz
AF Signal Generator
AC Voltmeter
DC Voltmeter: high impedance
VHF Sampling Coupler
SINAD Meter
Under no circumstances should any alignment be
attempted unless the normal function and operation
of the transceiver are clearly understood, the cause
of the malfunction has been clearly pinpointed and
any faulty components replaced, and realignment
determined to be absolutely necessary.
9
Alignment
Alignment Preparation & Precautions
A 50-Ohm RF load and in-line wattmeter must be
connected to the antenna jack in all procedures that
call for transmission; alignment is not possible with
an antenna. After completing one step, read the next
step to see if the same test equipment is required. If
not, remove the test equipment (except dummy load
and wattmeter, if connected) before proceeding.
Correct alignment requires that the ambient temperature be the same as that of the transceiver and
test equipment, and that this temperature be held
constant between 68 °F ~ 86 °F (20 °C ~ 30 °C). When
the transceiver is brought into the shop from hot or
cold air, it should be allowed some time to come to
room temperature before alignment. Whenever possible, alignments should be made with oscillator
shields and circuit boards firmly affixed in place.
Also, the test equipment must be thoroughly
warmed up before beginning.
Note: Signal levels in dB referred to in the alignment
procedure are based on 0dBµ = 0.5µV.
Test Setup
Set up the test equipment as shown below for transceiver alignment.
Entering the Alignment Mode
Alignment of the FT-2900R is performed using a front
panel software-based procedure. To perform alignment of the transceiver, it must first be placed in the
“Alignment Mode,” in which the adjustments will
be made and then stored into memory.
PLL Reference Frequency
Rotate the DIAL knob to set the alignment param-
eter to “
B0201 rFB0201 rF
B0201 rF.”
B0201 rFB0201 rF
Press the [D/MR(MW)] key to enable adjustment
of the “PLL Reference Frequency.”
Press the PTT switch to activate the transmitter,
adjust the DIAL knob so that the counter frequency reading is 146.000 MHz (±80 Hz).
Press the [D/MR(MW)] key.
RF Front-end Tuning
Inject a 145.100 MHz signal at a level of –10 dBµ
(with 1 kHz modulation @±3.5 kHz deviation)
from the RF signal generator.
Rotate the DIAL knob to set the alignment param-
eter to “
B0111 tnB0111 tn
B0111 tn.”
B0111 tnB0111 tn
Press the [D/MR(MW)] key to enable adjustment
of the “RF Front-end Tuning.”
Adjust the DIAL knob so that the maximum
SINAD.
Press the [D/MR(MW)] key.
Squelch Threshold Level
Inject a 145.100 MHz signal at a level of –14 dBµ
(with 1 kHz modulation @±3.5 kHz deviation)
from the RF signal generator.
Rotate the SQL knob to the 10-o’clocl position.
Rotate the DIAL knob to set the alignment param-
eter to “
B0111 tLB0111 tL
B0111 tL.”
B0111 tLB0111 tL
Press the [D/MR(MW)] key to enable adjustment
of the “Squelch Threshold Level.”
Press the [D/MR(MW)] key three times.
Press the [D/MR(MW)] key.
To enter the Alignment mode:
1. Press and hold in the [MHz(SET)] key while turning
the radio on.
2. Press and hold in the [PWR
( )]
switch for 1/2 sec-
ond to turn the radio off.
3. To enter the Alignment mode, press and hold in the
[REV(DW)] and [D/MR(MW)] keys while turning the
radio on. Once the radio is on, release these two key.
The transceiver is now in the “Alignment Mode.”
10
50-Ohm
Dummy Load
Inline
Wattmeter
Frequency
Counter
RF
Signal Generator
RF Sampling
Coupler
ANT
FT-2900R
MIC
AF
Signal Generator
TEST EQUIPMENT SETUP
DC INPUT
EXT SP
Signal Generator
SINAD MeterDeviation Meter
GND +8V
MIC INPUT
PTT/CLONE
RF
MIC SW1
MIC SW2
Alignment
S-meter Level (S-1)
Inject a 145.100 MHz signal at a level of –5 dBµ
(with 1 kHz modulation @±3.5 kHz deviation)
from the RF signal generator.
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “S-meter Level (S-1).”
Press the [D/MR(MW)] key three times.
Press the [D/MR(MW)] key.
S-meter Level (S-9)
Inject a 145.100 MHz signal at a level of +23 dBµ
(with 1 kHz modulation @±3.5 kHz deviation)
from the RF signal generator.
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “S-meter Level (S-9).”
Press the [D/MR(MW)] key three times.
Press the [D/MR(MW)] key.
TX Power (High)
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “TX Power (High).”
Press the PTT switch to activate the transmitter,
adjust the DIAL knob so that the RF Power Meter
reading is 75 W (±3.0W).
Press the [D/MR(MW)] key.
B0111 S1B0111 S1
B0111 S1.”
B0111 S1B0111 S1
B0111 S9B0111 S9
B0111 S9.”
B0111 S9B0111 S9
B0101 HPB0101 HP
B0101 HP.”
B0101 HPB0101 HP
TX Power (Low 2)
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “TX Power (Low 2).”
Press the PTT switch to activate the transmitter,
adjust the DIAL knob so that the RF Power Meter
reading is 10 W (±1.0 W).
Press the [D/MR(MW)] key.
TX Power (Low 1)
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “TX Power (Low 1).”
Press the PTT switch to activate the transmitter,
adjust the DIAL knob so that the RF Power Meter
reading is 5 W (±0.5 W).
Press the [D/MR(MW)] key.
TX Deviation
Inject a 1 kHz, 50 mV signal from the Audio Gen-
erator.
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “TX Deviation.”
Press the PTT switch to activate the transmitter,
adjust the DIAL knob so that the Deviation Meter
reading is 4.2 kHz (±0.1 kHz).
Press the [D/MR(MW)] key.
B0101 L2B0101 L2
B0101 L2.”
B0101 L2B0101 L2
B0101 L1B0101 L1
B0101 L1
B0101 L1B0101 L1
B0101 dUB0101 dU
B0101 dU.”
B0101 dUB0101 dU
.”
TX Power (Low 3)
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “TX Power (Low 3).”
Press the PTT switch to activate the transmitter,
adjust the DIAL knob so that the RF Power Meter
reading is 30 W (±1.5 W).
Press the [D/MR(MW)] key.
B0101 L3B0101 L3
B0101 L3.”
B0101 L3B0101 L3
CTCSS TX Deviation
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “CTCSS TX Deviation.”
Press the PTT switch to activate the transmitter,
adjust the DIAL knob so that the Deviation Meter
reading is 0.6 kHz (±0.05 kHz).
Press the [D/MR(MW
B0101 100B0101 100
B0101 100.”
B0101 100B0101 100
)]
key.
11
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