SECTION 4

4-1 RECEIVER CIRCUITS

CIRCUIT DESCRIPTION
(Q13) and converted into the fixed frequency of 1st IF signal by mixing with the 1st Local Oscillator (LO) signals from the VCO (Q76, D59D61). By changing the 1st LO frequency, only the desired frequency will pass through a pair of crystal filters at the next stage of the mixer. By changing LO frequency, the frequency of the 1st IF signal is fixed one for the receiving frequency. The converted 1st IF signal is passed through the BPF (FI1) and limiter (D63), then amplified by the 1st IF amplifier (Q14). The amplified 1st IF signal is applied to the IF IC (IC2, pin 16).
ANTENNA SWITCHING The antenna switching circuit toggles the receive (RX) line and transmit (TX) line. The received signals from the antenna are passed through a two-staged Low-Lass Filter (LPF; L1, L2, C1C5) and then applied to the antenna switch (D1, D2, D8, L15, L58, C52, C76, C516). While transmitting, the voltage on the T5V line is applied to D1, D2 and D8, and these are ON. Thus the TX line is connected to the antenna. Simultaneously, the RX line is connected to the GND to prevent transmit signal entering. While receiving, no voltage is applied to the D1, D2 and D8, and these are OFF. Thus the TX line and the antenna is disconnected to prevent received signals entering. Simultaneously, the RX line is disconnected from the GND and the received signals are passed through the LPF (L15, L58, C52, C76, C516). The ltered signals are applied to the RF circuits.
2ND IF CIRCUITS (RF UNIT) The 1st IF signal is converted into the 2nd IF signal and demodulated. The 1st IF signal from the 1st IF circuits are converted into the 2nd IF signal at the 2nd mixer section of the IF IC (IC2), by mixing with the 2nd LO signal which is generated at the reference frequency oscillator (X4) after being passed through the PLL IC (IC19, pins 1, 2) and the tripler (Q81). The converted 2nd IF signal is output from pin 3 and passed through the BPF (FI2) to remove the sideband noise, then applied to the 2nd IF amplifier section in IC2 (pin 5). The amplified 2nd IF signal is then applied to the FM-detector section. The demodulated AF signals are output from pin 9 and applied to the AF circuits.
RF CIRCUITS (RF UNIT) RF circuits lter and amplify the received signals within the frequency coverage. The received signals from the antenna switch are passed through a tuned Bandpass filter (BPF; D9, L16, C81) and applied to the RF amplifier (Q12) that received signals are amplified in low NF rate. The pass band frequency of the tuned BPF (D9, L16, C81) is adjusted by the tuning voltage T1 from the D/A converter (IC10, pin 2), to suppress unwanted signals for high selectivity. The amplified received signals are passed through the tuned BPF (D11, D12, L18, C92, C94, C96, C502), limiter (D72) and the tuned BPF (D65, L57, C505, C507), then applied to the 1st mixer (Q13).

The NOIS signal is applied to the CPU (LOGIC UNIT; IC8, pin 17), and the CPU compares the NOISE signal and set reference level (squelch threshold level). When the input NOIS signal is higher than reference level, the CPU cuts off AFON signal (from pin 4) to the AF power amplifier control circuit (LOGIC UNIT; Q14Q16) to deactivate the AF power amplifier (LOGIC UNIT; IC23).
- TONE SQUELCH The tone squelch circuit detects tone signals and opens the squelch only when receiving a signal containing a matched sub audible tone. When the tone squelch is in use, and a signal with a mismatched or no subaudible tone is received, the tone squelch circuit mutes the AF signals even when the noise squelch is open. A portion of the demodulated AF signals is passed through the LPF (LOGIC UNIT; Q53) to filters CTCSS/DTCS signal. The filtered signal is applied to the CPU (LOGIC UNIT; IC8, pin 93). The CPU compares the applied signal and the set CTCSS/DTCS, then the CPU controls the status (Low or High) of AFON signal as NOISE SQUELCH.

AF and MIC amp. CIRCUITS

Demodulated AF signals From IF IC (IC2, pin 9) IC3

IC23 AMP

HPF IC3

IC3 LPF

D/A converter
AF signals From the microphone

10 Pre-

IC4 MMUTE MICS

LOGIC UNIT RF UNIT

4-2 TRANSMITTER CIRCUITS
MICROPHONE AMPLIFIER CIRCUITS (LOGIC UNIT) The AF signals from the microphone (MIC signals) are ltered and level-adjusted at microphone amplier circuits. Audio signals from the microphone (MC1) are applied to IC3 (pin 10) which combines a microphone amplifier and preemphasis circuit. The MIC signals are amplified and filtered to obtain +6 dB/oct of frequency characteristic by IC3. The amplified and emphasized MIC signals are output from the pin 8, and passed through the splatter filter (IC3, pins 13, 14) which suppresses 3 kHz and higher audio components, via the TX/RX switch (IC4, pins 3, 4; 8, 9). The filtered MIC signals are then applied to the modulation circuit.
- TONE SIGNALS CTCSS/DTCS signals are output from CPU (LOGIC UNIT; IC8, pin 2) and passed through the LPF (R224, R227, C219), then applied to the LPF (as the AF mixeRF UNIT; IC3, pin 13) to be mixed with MIC signals. The mixed CTCSS/DTCS signals are applied to modulation circuits as MIC SIGNALS.
TRANSMIT AMPLIFIERS (RF UNIT) The transmit signal from the buffer amplier (Q74) is amplied to the transmit output level by the transmit ampliers. The buffer-amplified VCO output signal is amplified by transmit amplifiers; pre-drive (Q3), drive (Q2) and power (Q1) amplifiers in sequence, after being passed through the TX/RX switch (D3). The power-amplified transmit signal is passed through the power detector (D32, D33), antenna switch (D1) and LPF (as a harmonic filter ; L1, L2, C1C5), before being emitted from the antenna.

MODULATION CIRCUITS (RF UNIT) - MIC SIGNALS The modulation circuits modulates the VCO oscillating signal using the modulation signals. The MIC signals from AF circuits are passed through the D/A converter (IC10, pins 21, 22) for level (deviation) adjustment. The level adjusted MIC signals are applied to the variable capacitor (D61) in the VCO (Q76, D59D61), and modulate the VCO oscillating signal by changing the reactance of D61. The modulated VCO output are bufferamplified by Q75 and Q74, then applied to the transmit amplifier as a transmit signal.
APC (Automatic Power Control) CIRCUIT (RF UNIT) The APC (Automatic Power Control) circuit prevents the transition of the transmit output power level which is caused by load mismatching or heat effect, etc. At the power detector (D32, D33), a portion of the transmit signal is rectified into DC voltage which is proportional to the transmit power level. The rectified voltage is applied to the inverted input terminal of the operational amplifier (IC26, pin 2). The voltage T3 from the D/A converter (IC10, pin 10) is applied to the noninverted input terminal as the reference.
The operational amplifier compares the rectified voltage and reference voltage T3, and the difference of the voltage is output from the operational amplifier pin 1. The output voltage controls the bias of drive (Q2) and power (Q1) amplifiers for stable transmit output power. The change of transmit power is carried out by changing the reference voltage T3, and transmit muting (deactivation of drive and power amplifiers) is carried out by TX switch (Q37) controlled by TXC signal from CPU (LOGIC UNIT; IC8, pin 59).

APC CIRCUITS

VCO output from bufffer-amp (Q74) TX/RX SW D3 Q3

Pre-drv. AMP

Drv. AMP

PWR AMP

Power detector LPF

ANT SW LPF D1 PS5V

OP AMP 3

TXC T3

4-3 FREQUENCY SYNTHESIZER CIRCUITS
VCO (RF UNIT) VCO (Voltage Controlled Oscillator) is a oscillator whose oscillating frequency is controlled by adding voltage (lock voltage). VCO oscillates the both of transmit and 1st LO signals. The VCO output signals are buffer-amplified by Q74 and Q75. While receiving, the VCO output is passed through the TX/RX switch (D4) and the LPF (L29, L38, L59, C102, C435, C437, C539), then applied to the 1st mixer (Q13) to be mixed with the received signals to produce the 46.35 MHz 1st IF signal. While transmitting, the buffer-amplified VCO output is passed through the TX/RX switch (D3) and applied to the transmit amplifiers.

PSVCO T5V

RF UNIT LOGIC UNIT
RECEIVER CIRCUITS; IF IC (IC2), 1st mixer (Q13), 1st IF amp. (Q14), etc. FOR POWER SAVE MODE; APC amp. (IC26), tone amp. (IC26), etc.
Logical circuits; CPU (IC8), Reset IC (IC21), EEPROM (IC7), etc

CPU (IC8)

4-5 CPU PORT ALLOCATION
Tone signals (DTMF/BEEP/1750Hz). Tone signals (CTCSS/DTCSS). AF power amplier control signal. 4 AFON "High"=While the AF poer amp. is activated. AF line mute signal to the AF switch. 5 RMUTE "Low"=While muting. Clock frequency shift control signal to the 9 CSHIFT clock oscillator. CPU reset signal. 10 RESET "Low"=CPU reset. [PWR] Key. 16 PWRSW "Low"=When the key is pushed. 17 NOIS "NOIS" signal. Eexternal power supply connection detect. 18 DCC "Low"=Powered by external DC. Power supply detect. 19 HOUT "Low"=Powered by battery. Input signal from [PTT] key. 20 PTT "High"=While the key is pushed. Input signal from Key pads. 2124 KR0KR3 "Low"=When the key is pushed. 25 LEDC Backlight control signal to the LED driver. 33 DISDA Serial data to the LCD driver. 34 DISST Chip-enable signal to the LCD driver. 35 DISCK Serial clock signal to the LCD driver. 36 DISEN Disable signal to the LCD driver. 40 DICK Pulse signal from [CONTROL DIAL]. 41 DIUD [MONI] key. 42 MONISW "Low"=When the key is pushed. 45 PWRON Control signal to the power regulator. Input signal from Key pads. 4852 KS0KS4 "Low"=When the key is pushed. 53 MICS AF lter switching signal. MIC line mute signal to the AF switch. 54 MMUTE "low"=While muting. 55 DADATA Data signal to the D/A converter. 56 DACK Clock signal to the D/A converter. Pin No. Pin Name TONE CTCSS Description I/O

OUT OUT OUT

Pin No. 59

OUT IN IN IN IN

IN OUT IN IN IN IN IN IN IN OUT OUT OUT OUT OUT OUT
Strobe signal to the D/A converter. T5 line control signal to the T5 regulator. T5C "Low"=While transmitting. Transmit mute signal to the TX switch. TXC "Low"=While TX muting. PLL unlock signal. UNLK "Low"=PLL is unlocked. PLLSTB Strobe signal to the PLL IC. PLL IC power save mode switching signal. PLPS "Low"=While in power save mode. PLLDATA Data signal to the PLL IC. PLLCK Clock signal to the PLL IC. PLL loop lter characteristic toggle signal. PLLSW "High"=While the PLL is kicked-up. VCO regulator control signal. PSVCO "Low"=While Vco is activated." Charger circuit (High) control signal. CHGIH "High"=While charging. Charger circuit control signal. CHGC "High"=While charging. Power save line control signal to the PS5V PS5C regulator. "Low"=While power save mode. External MIC key (A/D) input. SI "High"=While the key is pushed. OPSD Data signal to the attached optional unit. ESCK Clock signal to the EEPROM. Scramble unit detection signal. OPV1 "Low"=DTMF unit is attached. Optional unit attachement detection signal. OPV2 "Low"=DTMF unit is attached. DTMF unit detection signal. OPV3 "Low"=DTMF unit is attached. DCIN External power supply's voltage detection. LVIN Lock voltage. SD "SD" signal (RSSI signal). VIN Remining battery voltage detection. CTCIN DTCS and CTCSS signals.

SKIP OPT
Verifies the adjustment value.
Stores the adjustment value and move to next adjustment item. Adjusts the value for the item automatically.
M QUITTING ADJUSTMENT MODE

Turn the power OFF.

ADJUSTMENT
ADJUSTMENT REFERENCE FREQUENCY [Fr] ADJUSTMENT CONDITION OPERATION VALUE 1 Connect a RF Power Meter or a dummy load to the antenna connector. Loosely couple a Frequency Counter to the antenna connector. Transmitting Rotate [CONTROL DIAL] during transmit to 146.00000 MHz adjust the frequency, then release the [PTT] and push [CLR] key to store the adjustment value and select the next adjustment item. (automatic adjustment) 7.0 W except [THA] 5.5 W [THA] 4.0 W 0.5 W
LOCK VOLTAGE [LU] TRANSMIT OUTPUT POWER [Po] (H; High) (M; Middle) (L; Low) DEVIATION [dE]
1 Connect an RF Power Meter to the Push [CLR] key during transmit, then push [Y] to select the next adjustment item. antenna connector. Transmitting 1 Connect an RF Power Meter to the Rotate [CONTROL DIAL] during transmit antenna connector. to adjust the output power, then release the Transmitting [PTT] and push [CLR] key during transmit to store the adjustment value and select the next adjustment item. 2 Transmitting 3 Transmitting NOTE: REFERENCE FREQUENCY should be adjusted before DEVIATION. Otherwise, DEVIATION will not be adjusted properly. 1 Connect an Audio Generator and AC millivoltmeter to the MIC line (see page 5-1) and set as; Frequency : 1 kHz Level : 90 mVrms Connect a Modulation Analyzer to the antenna connector through an attenuator, and set as; HPF : OFF LPF : 20 kHz De-emphasis : OFF Detector : (PP)/2 Transmitting Rotate [CONTROL DIAL] during transmit to adjust the deviation, then release the [PTT] and push [CLR] key to store the adjustment value and select the next adjustment item.

4.2 kHz

Push [Y] to skip this item.
DTCS NOTE: "DEVIATION should be adjusted before DTCS MODULATION BALANCE. MODULATION Otherwise, DTCS MODULATION BALANCE will not be adjusted properly. BALANCE 1 Set the Modulation Analyzer same as Rotate [CONTROL DIAL] during transmit [dt] to arrange the wave form, then release the DEVIATION. Connect an Oscilloscope to the detector [PTT] and push [CLR] key during transmit to output ter minal of the Modulation store the adjustment value and select the next Analyzer. adjustment item. No audio signal is applied to the MIC line. Transmitting [bP]* RECEIVE SENSITIVITY [tr] (Band low) Push [Y] to skip this item. NOTE: REFERENCE FREQUENCY should be adjusted before RECEIVE SENSITIVITY. Otherwise, RECEIVE SENSITIVITY will not be adjusted properly. 1 Connect an SSG to the antenna connector Push [CLR] key to store the adjustment value and set as; and select the next adjustment item. Frequency : Displayed frequency Level : 0 dB (107 dBm) Modulation : 1 kHz Deviation : 3.5 kHz Receiving 2 Set the SSG as; Frequency : Displayed frequency Receiving 3 Set the SSG as; Frequency : Displayed frequency Receiving 1 Connect an 8 spaeker to the AFOUT line (see page 5-1). Set the SSG as; Level : 19 dB (126 dBm) Receiving Push [CLR] key to store the adjustment value and select the next adjustment item. Push [CLR] key to store the adjustment value and select the next adjustment item. Rotate [CONTROL DIAL] to close the squelch once, then rotate [CONTROL DIAL] to set the squelch level at the point where the audio signals just appear. Push [CLR] key to store the adjustment value and select the next adjustment item.

Set to square wave form

(automatic adjustment)

(Band center)

(Band high)

SQUELCH [Sq]

Squelch open
*; These items MUST NOT be modied. Otherwise, the transceiver will not perform properly. 5-3

ADJUSTMENT (continued)

ADJUSTMENT S-meter [Sr] ADJUSTMENT CONDITION OPERATION VALUE
NOTE: RECEIVE SENSITIVITY should be adjusted before S-meter. Otherwise, S-meter will not be adjusted properly. 1 Set the SSG as; Frequency : Displayed frequency Level : 6 dBu (113 dBm) Receiving Push [CLR] key to store the adjustment value and select the next adjustment item. (automatic adjustment)
[dF]* [Et]* CTCSS AMPLITUDE (f=5.00 kHz) [C5] (f=6.25 kHz) [C6] [dt]* to [D6]*
Push [Y] to skip this item. Push [Y] to skip this item. NOTE: DTCS MODULATION BALANCE (page 5-3) should be adjusted before CTCSS AMPLITUDE. Otherwise, CTCSS AMPLITUDE will not be adjusted properly. 1 Set the Modulation Analyzer same as Rotate [CONTROL DIAL] during transmit to DEVIATION. adjust the daviation, then release the [PTT] and 2 No audio signal is applied to the MIC line. push [CLR] key to store the adjustment value. Transmitting Skip these items. (The adjustment is completed. Turn the power OFF.) 0.75 kHz
*; These items MUST NOT be modied. Otherwise, the transceiver will not perform properly.

SECTION 6

[LOGIC UNIT]

REF NO.

IC3 IC4 IC7 IC8 IC12 IC21 IC22 IC23 Q1 Q2 Q6 Q14 Q15 Q16 Q17 Q21 Q31 Q38 Q53 Q54 Q55 Q56 Q57 D8 D10 D27 D34 D39 D40 D41 D42 D43 D44 D46 D47 D48 D49 D56 D66 D67 D68 D69 D70

PARTS LIST

H/V M. LOCATION
B B B B B B B B T B B B T T B B T B B B T T T B B T B B B B B B B B B B B B B B B B B B B B B B B B B B T T B B B B B B B B B B B B B B B B B B B B B B B T T T T 5.6/21.2 14.1/18.2 5.5/36.7 23.8/34.4 8.2/75 43.9/25.1 22.4/55.9 30.2/67.1 5/63 4.7/64.7 35.8/39.1 38.7/84 40.8/72.1 41.8/76.8 8.1/70.2 7.7/4.3 41.8/62.2 27.7/47.6 8/44.2 5.2/10.4 5.4/84.7 10.5/77.6 8.1/80.3 37.4/33.9 37.3/31 42.3/65.5 10.5/68.4 8.2/78.2 24.6/20.1 34.8/27 34.1/21.1 26.5/15.5 35.4/6.2 39.6/27.5 38.4/27.5 37.2/27.5 36/27.5 37.2/45 36/24.5 37.2/24.5 38.4/24.5 39.6/24.5 40.8/24.5 42.4/44.3 8/62.8 8/63.7 33.4/39.9 8/64.6 8.1/65.5 5.3/62.5 3.6/62.5 11/15.2 34.2/74 34.2/72.2 34.9/41.8 37.9/36.4 37/36.4 4.6/34.2 2.4/15 5.7/16.6 4.1/16.6 10/28 9.9/29.2 7.5/29.8 4.8/29 39.3/42.1 37.3/40.1 38.4/43.7 5.4/26 8.7/28.4 3.3/26.4 10.1/24.4 7.1/15.4 10.8/29.2 7.5/26.4 8.7/26 10/27.1 43.5/75.2 44/77.3 40/76.7 40.4/78.7

T B B B B B B B T B B B B B B B B B B B T B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B T T T B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B

H/V LOCATION

40.4/78.7 22.7/66.6 22.7/66.6 25.3/67.9 25.3/67.9 34.9/67.9 10.7/70.7 7.4/71.9 44.4/78.7 42.5/14 7.5/27.3 9.4/5 7.4/68.4 28.2/44.5 43.4/27.4 6.3/26 32.7/7.8 9.1/32.3 2.4/32.6 10/32.3 41.8/63.6 2.4/14.1 6.4/14.1 7.5/28.9 12.5/44.3 11.5/44 30.2/61.5 28.4/61.5 27.5/61.5 26.6/61.5 24.3/48 9.7/36.5 26.1/47.3 10.6/36.5 32.3/40.5 34.4/30 29.2/44.8 11/21.9 7.8/2.4 4.5/27.8 7.9/41.6 6.1/43.8 6.1/45.4 8/46.4 7.1/46.4 8.9/46.4 9.8/43.8 11.1/41.6 19/46.3 5.4/8.5 6.9/10.6 8.7/77.1 8.1/82.1 8.1/78 9/78 7.9/42.5 33.1/41.8 34.1/9.5 34.8/7.3 3.6/27.8 34.7/45 6.2/15.4 32.2/42.1 34.1/10.4 34.1/11.3 33.6/7.8 32.2/12.6 33.4/14 33.4/13.1 33.4/12.2 10.2/26.2 25.7/61.5 16.5/43.8 14.6/41.9 20.3/47.6 17.1/44.4 24.8/66.1 29.9/25.5 11.4/38.7 12.7/40 13.9/41.2 27.5/59.2 33.8/29.4 27.4/22.6 23.8/21.2 32.1/27.7 30.9/26.5 29.1/24.8 33.1/28.7 3.6/61.6 16.4/28.1 7.1/12.3 37.9/42.5 36.6/43.7 38.4/41.3 5.7/61.3
MA8082-M (TX) MA2S111-(TX) MA742 (TX) MA8056-M (TX) ISS400 TE61 ISS400 TE61 ISS400 TE61 ISS400 TE61 ISS400 TE61 ISS400 TE61 ISS400 TE61 except [USA/-2], [KOR] only S.DIO ISS400 TE61 [THA], [EXP/-2/-3] only S.DIO ISS400 TE61 [EUR/-1], [EXP/-2/-3], [UK] only S.DIO ISS400 TE61 [EXP/-2/-3], [KOR] only S.VCP HVC376BTRF-E S.DIO ISS400 TE61 except [USA], [USA-2], [EXP/-2/-3] only S.DIO ISS400 TE61 [EUR/-1], [USA/-2], [UK], [KOR] only S.DIO ISS400 TE61 [TPE], [THA], [KOR], [TPE-2] only S.DIO ISS400 TE61 [THA], [EXP/-2/-3] only S.DIO ISS400 TE61 except [EXP/-2/-3], [THA] only CR-836 (FTX9.8304M16SM) ERJ2GEJ 151 X (150) ERJ2GEJ 272 X (2.7 k) ERJ2GEJ 104 X (100 k) ERJ2GEJ 272 X (2.7 k) ERJ2GEJ 272 X (2.7 k) ERJ2GEJ 272 X (2.7 k) ERJ2GEJ 472 X (4.7 k) ERJ2GEJ 101 X (100) MCR10EZHJ 5.6 (5R6) MCR10EZHJ 5.6 (5R6) ERJ2GEJ 104 X (100 k) ERJ2GEJ 103 X (10 k) ERJ2GEJ 103 X (10 k) ERJ2GEJ 103 X (10 k) ERJ2GEJ 273 X (27 k) ERJ2GEJ 105 X (1 M) ERJ2GEJ 155 X (1.5 M) ERJ2GEJ 224 X (220 k) ERJ2GEJ 154 X (150 k) ERJ2GEJ 184 X (180 k) ERJ2GEJ 104 X (100 k) ERJ2GEJ 105 X (1 M) ERJ2GEJ 100 X (10) ERJ2GEJ 123 X (12 k) ERJ2GEJ 104 X (100 k) ERJ2GEJ 154 X (150 k) ERJ2GEJ 224 X (220 k) ERJ2GEJ 104 X (100 k) ERJ2GEJ 105 X (1 M) ERJ2GEJ 683 X (68 k) ERJ2GEJ 183 X (18 k) ERJ2GEJ 124 X (120 k) ERJ2GEJ 152 X (1.5 k) ERJ2GEJ 473 X (47 k) ERJ2GEJ 152 X (1.5 k) ERJ2GEJ 272 X (2.7 k) ERJ2GEJ 822 X (8.2 k)
X2 R1 R2 R3 R4 R6 R7 R8 R9 R10 R11 R17 R19 R22 R44 R93 R94 R95 R97 R98 R99 R100 R101 R102 R103 R104 R107 R108 R109 R112 R113 R114 R115 R117 R120 R121 R122 R123

4030017640 4030017460

T T T T B T T T T T T T T T B T B T T T B B B B B B B B T T B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B T T B B T T B T B T T B B B B B B T T B B B B B T T T T B B B B B T T B B B 17.1/37.9 25.7/36.2 9.9/46.9 25.4/32.5 27.4/33.1 16.9/33.3 13.5/37 15.1/37.2 26/26.8 26/22.6 21.1/23.9 24.8/22.2 23.9/20.6 20.6/50.4 33.3/7.8 10.9/47.9 33.2/5.5 12.2/53.2 20.4/52.2 20.6/49.5 35.2/5.7 41.1/7 40.4/2.9 40.4/4.5 3.5/9.8 39.2/42.4 10/10.5 31.6/8.6 31.6/35.5 30/35.5 36.4/45.1 37.2/36.1 37.6/34.8 42/33.9 31.6/32.4 31.6/33.3 33.4/29.4 29.4/33.8 35/28.9 38.6/28 33.8/26.6 38.8/23.5 35.1/24.8 35/28 33/18.2 31/22.1 28/25.9 28/26.8 25.1/22 30.2/27.8 31.1/27.8 15.8/24.2 7.7/20 14.5/30.1 12.5/30.1 14.3/26.9 13.9/23.7 13.9/28.1 4.6/27.1 11.5/30.1 4.6/26.2 4.6/28 6/30.1 7.9/30.1 42/18.5 36/31.1 41.4/20 30.3/22 30.1/39.4 32.2/42.9 6.4/20.5 6.4/22.4 38/19.5 32.5/38.4 39.3/18.7 30.6/45.7 31.4/40.5 34.2/33.2 29.7/42.3 30.2/46.7 28.9/46.7 33/50.5 30.1/38.5 13.5/38.6 16.4/17.7 27.8/37.6 25.1/11.3 3.1/13.4 13.9/25.3 25.4/23.9 6.6/23.7 7.9/22.2 36.4/21.7 32.5/27.1 4.9/5.7 4.8/30.1 10.6/30.1 7/11.9 7/10.1 23.7/16.7 26/20.8 31.5/20.9 30.8/16.5 30.8/13.4
C439 C440 C441 C442 C443 C444 C445 C446 C447 C448 C449 C450 C451 C452 C453 C454 C455 C456 C457 C458 C459 C460 C461 C462 C463 C464 C465 C466 C467 C471 C472 C473 C474 C475 C476 C478 C479 C482 C486 C487 C488 C489 C491 C492 C493 C496 C497 C499 C500 C502 C503 C504 C505 C506 C507 C509 C510 C511 C512 C516 C518 C519 C521 C522 C523 C534 C536 C537 C538 C539 C541 C542 C543 C544 C545 C546 C548 C549 C550 C552 C553 C556 C565 C566 C567 C601 C602 C603 C604 J1 J2 J3 EP1 EP3
4030017460 S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.TAN S.TAN S.TAN S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.MLR S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER S.CER
ECJ0EC1H010B ECJ0EC1H080C ECJ0EB1E102K ECJ0EB1E102K ECJ0EC1H470J ECJ0EC1H040B ECJ0EC1H0R5B ECJ0EC1H220J ECJ0EC1H010B ECJ0EC1H010B ECJ0EB1E102K ECJ0EB1E102K ECJ0EC1H030B ECJ0EC1H040B ECJ0EC1H470J ECJ0EC1H030B ECJ0EC1H030B C1608 CH 1H 180J-T C1608 CH 1H 220J-T ECJ0EB1E102K ECJ0EB1E102K C1608 CH 1H 120J-T ECJ0EB1E102K ECJ0EB1E102K ECJ0EB1E102K C1608 CH 1H 0R5C-T ECJ0EB1E102K C1608 CH 1H 680J-T C1608 CH 1H 100D-T C1608 JB 1E 104K-T TEESVA 0J 685M8R TEESVA 1V 224M8R TEESVA 1V 104M8R ECJ0EB1E102K ECJ0EB1E102K ECJ0EB1E102K ECJ0EB1C103K ECJ0EB1E102K ECJ0EB1A104K ECJ0EC1H470J ECJ0EB1E471K ECJ0EB1E102K ECJ0EC1H560J ECJ0EC1H040B ECJ0EB1E102K ECJ0EB1C103K ECJ0EC1H050B ECJ0EC1H030B ECJ0EB0J105K ECJ0EC1H020B ECJ0EC1H010B ECJ0EC1H010B ECJ0EC1H101J ECJ0EB1E102K ECJ0EC1H020B ECJ0EB1E102K C1608 CH 1H 820J-T ECJ0EB1E102K ECJ0EB1E102K C1608 CH 1H 150J-T ECJ0EB1E102K ECPU1C104MA5 ECJ0EB1E102K ECJ0EB0J105K ECJ0EB0J105K ECJ0EC1H270J C1608 CH 1H 010B-T C1608 CH 1H 010B-T ECJ0EB1E102K ECJ0EB1E102K ECJ0EC1H470J ECJ0EB1E102K ECJ0EC1H470J ECJ0EC1H470J ECJ0EC1H470J ECJ0EC1H470J ECJ0EC1H470J ECJ0EC1H470J ECJ0EC1H470J ECJ0EC1H470J ECJ0EC1H470J ECJ0EC1H470J ECJ0EC1H470J ECJ0EC1H470J ECJ0EC1H470J ECJ0EB1E102K ECJ0EB1E102K ECJ0EB1E102K ECJ0EB1E102K

T B T B B B B B B B B B B B B T T B B B T B B B B B B B T T T T T T T B B B B T T B T T T T T B B B B B B B B B T T T B T B B B B B B B B B B B T T T T T T T T T T T T T B B B B 24.4/14.1 27.8/16.1 23.1/12.3 26.4/11.1 27.3/9.2 24.9/10.1 24.9/9.2 27.3/8.3 27.1/4.4 22.6/5.8 24.6/4.6 25.5/6.4 23.7/12.9 21.4/15.3 21.1/16.5 19.8/16.5 18.6/17 22.9/7.8 20.3/7.6 20/4.6 30.6/8.7 17.2/9.6 19.2/12 23.3/8.9 18.6/7.4 15.9/9.6 16.5/4.4 27.8/41.7 26.3/46.5 35.6/11.8 1.3/14.6 1.3/7.7 3.4/14.6 2.8/18.1 11.2/12.2 27.2/23.5 15.1/22.9 10.4/19.9 9.4/9.6 13.9/19.3 14.3/20.5 7/11 10.3/21.6 8.8/22.2 15/22 12.7/20.5 10.4/16.3 32/30.4 27.9/31 33.8/28.2 33.8/25 33.8/23.4 35/22.4 40/21.3 36.6/21 12.4/8.7 27.5/46.5 29.3/17.2 29/38.2 39.2/36 19.7/12.8 16.1/15.2 8.2/10 31.6/12.2 31.6/11.3 30.9/18.1 32.3/48.6 29.7/40.5 32.4/23.4 31/23.7 3.1/30.2 24.8/15.6 36.4/9.4 37.4/9.4 39.6/8.6 23.2/1.6 22.3/2 21.4/2 20.5/2 19.6/2 18.7/2 17.8/2 13.8/2 12.9/2 12/2 32/28.1 29.3/27.8 27/25.2 33.8/35.2
6450000870 CNR HEC2711-01-S.CNR 54104-3696 (3692) 6510025910 CNR BNC-RS.BEA 6910014640 S.BEA MPZ1608S221A-T MPZ2012S221A-T

17.6/6.3

34.9/6.8 37/5.8
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY

[CHASSIS PARTS]

MP1 MP2

DESCRIPTION QTY.

J1 J2 J3 MP1* MP2 MP5* MP6 MP7 MP8 MP9
6450000870 HEC2711-01-54104-BNC-R8510017480 8930072250
MP3 MP4 MP5 MP6 MP7 MP8 MP9 MP10 MP11 MP12 MP13 MP14 MP15 MP16 MP17 MP18 MP19 MP20 MP21 MP22 MP23 MP24 MP25 MP26 MP27 MP28 MP29 MP30
CHASSIS T-FRONT PANEL (incl. MP4, 5, 6, 7, 12, 14, 24) Except [THA] T-FRONT PANEL (A) (incl. MP4, 5, 6, 7, 12, 14, 24) [THA] REAR PANEL WINDOW PLATE WINDOW SHEET PTT PANEL PTT BUTTON JACK CAP DC CAP T-KEY MAIN SEAL PTT RUBBER JACK PLATE SP NET HEX NUT 8830001250 ANT CONNECTOR-101 nut 8610012170 KNOB N-2251 OPT SHEET RELEASE BUTTON RELEASE PLATE MIC SPONGE 8930056540 Push spring (AH) 8930055870 O-ring (AO) SHEET (A)-knob spring NO.7800P tap 1 at washer B0 2X4 NI-ZC3 (BT) 8810010191 Screw BiH M2X4 SUS SSBC 8810009511 Screw BT B0 2X4 NI-ZC3 (BT) 8810009221 Screw BT B0 2X8 NI-ZK3 (BT) 8810009561 Screw BT B0 2X6 NI-ZK3 (BT)

2964 VCO CASE 2403 CONTACT SPRING -PA HEATSINK 2721 VCO COVER Shield sponge (BU) 2964 RF SHIELD 2964 ANT SPRING
*: Refer to SECTION 9 BOARD LAYOUTS.

[ACCESSORIES]

EP1 EP2 EP3 EP5 MP1 MP2
OptionalProduct OptionalProduct OptionalProduct OptionalProduct OptionalProduct
BP-226 EXP [USA], [EUR], [TPE], [THA], [EXP] BP-227 [USA-2], [EUR-1], [UK], [KOR], [TPE-2], [EXP-2] BC-167D [UK],[EXP-2] BC-167A [USA-2], [TPE-2] FA-B2E 6910018620 BLACK HANDY STRAP

OptionalProduct MB-98

OPTION SHEET
DS4 MC1 S3 S801 S802 SP1 W5 W6 EP1 MP1 MP2 MP3
5030002970 SEM6027P-46C33-G

MP1 EP1 EP5

2260002840 SKHLLFATP70N00E2015F-SKHLLFACS028014-OPC-1190A 8900016400 OPC-SRCN-2964-SP-N-W REFLECTOR LCD HOLDER LOGIC SHIELD

Screw abbreviations

A, B0, BT: Self-tapping PH: Pan head ZK: Black NI-ZU: Nickel-Zinc SUS: Stainless 7-1
MP8(C) SP1(L) MP17(C) MP3(C) MP16(C) A
J3(R) MP2(C) MP10(C) MP2(R) MP15(C)

MP23(C)

MP19(C) MP20(C) MP11(C) MP28(C) MP9(R) MP8(R) MP5(C) MP4(C) MP9(C) MP29(C)

MP22(C)

MP26(C) MC1(L) MP28(C)

MP28(C) MP18(C)

MP28(C) W5(L) MP3(L) MP1(C) A DS4(L) EP2(L) MP2(L) MP26(C)

MP28(C) MP29(C) MP28(C)

MP1(C)

MP13(C) W6(L)

MP26(C) MP26(C)
SECTION 8 SEMICONDUCTOR INFORMATION

TRANSISTERS AND FETs

2SA1576A (Marking: FQ)

B C E E

DIODES

2SB1132 (Marking: BA)

2SA1588 (Marking: ZY)
2SB1201S (Marking: TP-FA)

2SC4116 (Marking: LY)

1SV271 (Marking: TG)

1SV286 (Marking: T7)

SB07-03C-TB-E (Marking: J)

DA221 (Marking: K)

HVC350BTRF (Marking: B2)

2SC4211 (Marking: LY)

2SC4617 (Marking: BR)

2SC5006 (Marking: 24)

2SC5085 (Marking: MCY)

2SC5231 (Marking: CY)

HVC375BTRF (Marking: B8)

HVC376BTR (Marking: B9)

HVU131TRF (Marking: P1)

1SS400 (Marking: A)

MA133 (Marking: MP)

2SK1069 (Marking: FJ)

3SK318YB (Marking: YB)

DTC144EUA (Marking: 26)

HAT1026R (Marking: 1026)

D2 D2 D1 D1 G2 S2 G1

D40 IC4

R95 C126

R93 R176

R482 R483 R484 R477

R476 R362

R164 R478

C548 C549 C551 C552 C550

GND 1 GND GND GND HSW HOUT VIN CHGC CHGIH NOIS SD DETO PSVCO PLLSW LVIN PLLCK PLLDATA PLPS PLLSTB UNLK R5V TXC CTCSS PS5V SW5V T5C VOLOUT VOLIN MODIN DCIN HV DASTB DACK DADATA GND GND VCC VCC 38

C76 D2 D1 C52 L15 C537

C204 C288

C82 R57

R59 C88 C87 R252

R259 C89 C92

R75 C105

L19 D12

C95 R66 C96

C612 R519

L42 C542 R20 R431
C522 C523 R48 R50 C70 C31 C38 R49

D59 L44

C54 C486 R402 R438

C442 R423

C444 C445 R425

R437 C462

C443 C446

R435 C448

R427 L41 C447

R433 C458

C148 X2

R330 C282

C554 R130 C147

C152 R128

C163 R144

C540 C385

R6 R4 R2 R1 R7 R8 R537

B6705B

C546 C547

R194 C541

R195 R525

R196 R227

R491 R224 C219 C249 R324 R321 R323 R320 C232 R181

C195 R101

R103 R547 R19

R546 R22

L 58 R601 R160

C M P5

D8 D10
D46 D69 D47 D68 D48 D67 D49 D66 D41

R170 R113 C555 R98

R168 C212 R107 R115

To J2 (MAIN UNIT)

C120 C117 C119

R 5 16

R456 R455

D42 D43

R112 R9

L38 R418

Q11 IC19

C301 R30 R337

R543 R329 C375

C429 C489

C 46 0

C463 R4 36

C 4 13

R440 C465

R505 R514
S-14315XH-P2 Printed in Japan 2007 Icom Inc.

SECTION 10

HOUT IC25:EW-460 D73:MA2S111 Q82:DTC144EU AMP

BLOCK DIAGRAM

SW5V IC24:S-812C36AMC REG D64:1SS400 D71:1SS400 UNLK UNLOCK DET Q34:2SK1069 DC-AMP X4:CR-783 (15.3MHz) REF OSC DCIN RMOD FC LVIN VCO5 VCO5 Rx:182.350-220.350MHz Tx;136.000-174.000MHz D3:1SV271 D4:MA2S077 Q83:2SC4617 BUFF VCO D59:MA2S304 D60:MA2S304 D61:1SV286 Q76:2SC5231 Q75:2SC5231 BUFF Q74:2SC5231 TX/RX SW Q3: 2SC5085 PRE DRIVE Q2: RD01MUS1 DRIVE AMP Q1: RD12MVS1 PWR AMP LPF D32:MA742 D33:MA742 PWR DET D1:HVU131 D2:MA77 D8:MA77 ANT SW T5 VCC VCC ANTENNA

Tx/Rx:136.000-174.000MHz

IC19:MB15E03SL PLL IC LOOP FIL

MODOUT

J1:HEC2711-01-020

D5;1SS400 EXT-V DETECT

HV D14:MA133 D15:MA2S111 D16:SB07-03C Q10:2SC4617 Q18:2SC1588 Q19:2SC1201 Q9:UNR9213 D6:RB060L D7:MA2S728 Q4:HAT1026

CHGC CHGIH

VCO SHIFT D58:MA2S077 Q77:UNR921NJ

CHARG BATT

LPF BUFF BPF AMP LOOP SW Q5:2SC5006 1st LO R5V R5V
IC26(1/2):LMV358IPW Q37:UNR9113J PS5V APC CTRL

VCCBT GNDBT DC SW

0.0018

68K 68K C373

100K C165

0.0068

J5 AXN330C130P
1k RR491 KS3 KS2 KS1 KS0 CCS PWRON H/ L MONISW DICK DIUD IR1 IR0 DISEN DISCK DISST DISDA BUSY SCLK RXD TXD CLOUT CLIN R534 0.1 47K R533
HSJ1102-018540 MMZ1608Y102BT COM4 COM3 COM2 COM1
OPSCK SI OPSD BD5242G NC CD VSS VDD OUT IC21 R148 100K

0.001 C144

COM2 COM1 S34 S33 S32 S31 S30 S29 S28 S27 S26 S25

100 VCC PWRON SW5V

OPV1 OPV2 OPV3 OPT3 OPT2 OPT1 DCIN LVIN DETO

R522 1k

R523 1k 0.001

R524 1k C544 0.001

S-812C50AMC NC NC VOUT VIN GND IC2 1
P94/DA1/TB4IN P93/DA0/TB3IN P92/TB2IN/SOUT3 P91/TB1IN/SIN3 P90/TB01IN/CLK3 BYTE CNVSS P87/XCIN P86/XOUT RESET XOUT VSS XIN VCC1 P85/NMI P84/INT2ZP P83/INT1 P82/INT0 P81/TA4IN/ U P80/TA4OUT/U P77/TA3I N P76/TA3OUT P75/TA2IN/ W P74/TA2OUT/W P73/CTS2/RTS2

0.0022 C305

0.0022

470P R331

S-24CS64A0 I

2.2 C245

0.01 C174

56K C541

56K C546
2SB1132 Q55 Q57 XP1501 34

PS5C R5C

C195 R103 56P X2 RR224 0.0039 C216 39K

D56 HVC376B

12K C380 0.001 R398 Q56 UNR9213J 5.02V CSHIFT 100K C379

CR-836 R101 1M

R227 3.9K

0.047 C547 0.047

4.57V R332 5.05V 1SS400 6.8K

Q38 8P CSHIFT RESET

R474 NOIS R346 47K 100K

ANI D40

S104 KE Y UP

SKE Y DN

AFON RMUT E

R335 1M

DCC HOUT PTT

UNR9213J

1SS400 *D69 SCRM *D46 BAND4 D41 1SS400 MONISW *D68 RXEXP *D47 BAND3 D42 1SS400 1k *D67 TXEXP *D48 BAND2 D43 1SS400 *D66 COMEXP *D49 BAND1 D44 1SS400

S108 KE Y A

SKE Y B

SKE Y C

S111 KE Y D

KR0 KR1 KR2 KR3

SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12

2SA1576 Q54

ESCK ESDA

2SA1576 Q21

A0 A1 A2 VSS

8 VCC 7 WP 6 SC L 5 SDA

P1/S1 P2/S2 P3/S3 P4/S4 P5/S5 P6/S6 P7/S7 P8/S8 S9 S10 S11 S12
P12/D10 P11/D 9 P10/D 8 P07/AN07/D7 P06/AN06/D6 P05/AN05/D5 P04/AN04/D4 P03/AN03/D3 P02/AN02/D2 P01/AN01/D1 P00/AN00/D0 P107/AN7/KI3 P106/AN6/KI2 P105/AN5/KI1 P104/AN4/KI0 P103/AN3 P102/AN2 P101/AN1 AVSS P100/AN0 VREF AVCC P97/ADTRG/SIN4 P96/ANEX1/SOUT4 P95/ANEX0/CLK4