Icom IC-GM1600E, IC-GM1600 User Manual

SERVICE MANUAL

SURVIVAL CRAFT 2-WAY RADIO

INTRODUCTION

This service manual describes the latest service information for the time of publication.

IC-GM1600/E VHF MARINE TRANSCEIVER

MODEL VERSION TX Hi-POWER

IC–GM1600

IC–GM1600E

To upgrade quality, all electrical or mechanical parts and internal circuits are subject to change without notice or obligation.

USA 2 W GEN 2 W EUR 2 W

UK 2 W

at the

DANGER

NEVER connect the transceiver to an AC outlet or to a DC

power supply that uses more than 7.5 V. Such a connection could cause a fire or electric hazard.

DO NOT reverse the polarities of the power supply when connecting the transceiver.

DO NOT apply an RF signal of more than 20 dBm (100 mW) to the antenna connector. This could damage the transceiver's front end.

ORDERING PARTS

Be sure to include the following four points when ordering replacement parts:

1. 10-digit order numbers

2. Component part number and name

3. Equipment model name and unit name

4. Quantity required

5030002790 LCD A0286 IC-GM1600 Main unit 5 pieces 8810009510 Screw BO 2x4 NIxZU (BT) IC-GM1600E Chassis 10 pieces

Addresses are provided on the inside back cover for your convenience.

REPAIR NOTES

1. Make sure a problem is internal before disassembling the transceiver.

2. DO NOT open the transceiver until the transceiver is disconnected from its power source.

3. DO NOT force any of the variable components. Turn them slowly and smoothly.

4. DO NOT short any circuits or electronic parts. An insulated turning tool MUST be used for all adjustments.

5. DO NOT keep power ON for a long time when the transceiver is defective.

6. DO NOT transmit power into a signal generator or a sweep generator.

7. ALWAYS connect a 30 dB to 40 dB attenuator between the transceiver and a deviation meter or spectrum analyzer when using such test equipment.

8. READ the instructions of test equipment thoroughly before connecting equipment to the transceiver.

Icom, Icom Inc. and logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries.

SECTION 1 SPECIFICATIONS

SECTION 2 INSIDE VIEWS

SECTION 3 DISASSEMBLY INSTRUCTIONS

SECTION 4 CIRCUIT DESCRIPITON

4-1 RECEIVER CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4-2 TRANSMITER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

4-3 PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

4-4 POWER SUPPLY CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

4-5 PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

SECTION 5 ADJUSTMENT PROCEDURES

5-1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

5-2 SOFTWARE ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

SECTION 6 PARTS LIST

SECTION 7 MECHANICAL PARTS AND DISASSEMBLY

SECTION 8 SEMICONDUCTOR INFORMATION

SECTION 9 BOARD LAYOUTS

9-1 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

9-2 VR BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3

9-3 MIC BOARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3

9-4 BC-158. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3

SECTION 10 BLOCK DIAGRAM

SECTION 11 VOLTAGE DIAGRAM

11-1 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1

11-2 VR / MIC BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-3

SECTION 1 SPECIFICATIONS

IC-GM1600 IC-GM1600/E

[USA] [GEN], [EUR], [UK]

• Frequency coverage

• Number of programable channels 100 channels

• Type of emission 16K0G3E 16K0G3E (for ATIS)

• Antenna impedance 50 Ω (nominal)

• Operating temperature range −4˚F to +140˚F –20˚C to +55˚C

• Power supply requirement 7.5 V DC nominal (negative ground) 7.2 V DC nominal (negative ground)

GENERAL

• Current drain (approx.)

• Dimensions (projections not included) 65(W) × 145(H) × 44(D) mm; 2

• Weight (approx.) 385 g; 13.58 oz. (Including BP-234)

• Output power High 2 W

• Modulation Variable reactance frequency modulation

• Max. frequency deviation ± 5.0 kHz

• Frequency error

• Spurious emissions –70 dBc typ.

• Adjacent channel power 70 dB

• Audio harmonic distortion 10% (at 60% deviation)

• FM hum and noise 40 dB –

TRANSMITTER

• Residual modulation – 40 dB

• Audio frequency response +1 dB to –3 dB of 6 dB oct. from 300 Hz to 3000 Hz

• Limiting charact. of modulation 60–100% of max. deviation

• Microphone impedance 2 k

• Receive system

• Intermediate frequencies 1st : 31.05 MHz, 2nd : 450 kHz

• Sensitivity 0.25 µV typ. at 12 dB SINAD –2 dBµ emf typ. at 20 dB SINAD

• Squelch sensitivity –6dBµ typ. (at threshold) –2 dBµ emf typ. (at threshold)

• Adjacent channel selectivity 70 dB typ. 70 dB

• Spurious response

• Intermodulation rejection ratio 70 dB typ. 68 dB

• Hum and Noise

RECEIVER

• Audio frequency response

• Audio output power (at 10% distortion with an 8 Ω load)

• Output impedance (audio) 8

Specifications are measured in accordance with TIA/EIA–603 and FCC PARTS 80.271 (IC-GM1600), All stated specifications are subject to change without notice or obligation.

RX 156.050–163.275 MHz [ON-BOARD] 156.000–163.425 MHz [ON-BOARD]

TX/RX 156.300–156.875 MHz [SURVIVAL]

RX 0.2 A (at max. audio)

Low 1 W

156.025–157.425 MHz [ON-BOARD] 156.000–161.450 MHz [ON-BOARD]

2 W 1.0 A

1 W 0.7 A

/16(W) × 5 23/32(H) × 1 3/4(D) in.

±5.0 ppm ±1.5 kHz

0.25 µW (30 MHz to 1 GHz)

1.00 µ W (1 GHz–2 GHz)

Ω

Double conversion superheterodyne system

70 dB typ. 70 dB

40 dB

+1 dB to –3 dB of 6 dB oct. (from 300 Hz to 3000 Hz)

0.35 W typ. 0.2 W typ.

+1 dB to –3 dB of –6 dB oct. (from 300 Hz to 3000 Hz)

Ω

and IEC61097

12 (IC-GM1600E).

–

1 - 1

• CHANNEL LISTS

• International channels

Frequency (MHz)

Transmit Receive Transmit Receive Transmit Receive Transmit Receive Transmit Receive Transmit Receive

01 156.050 160.650 11 156.550 156.550 21 157.050 161.650 61 156.075 160.675 71 156.575 156.575 81 157.075 161.675

02 156.100 160.700 12 156.600 156.600

03 156.150 160.750 13 156.650 156.650 23 157.150 161.750 63 156.175 160.775 73 156.675 156.675 83 157.175 161.775

04 156.200 160.800 14 156.700 156.700 24 157.200 161.800 64 156.225 160.825 74 156.725 156.725 84 157.225 161.825

05 156.250 160.850 15*1156.750 156.750 25 157.250 161.850 65 156.275 160.875 75*3156.775 156.775 85 157.275 161.875

06 156.300 156.300 16 156.800 156.800 26 157.300 161.900 66 156.325 160.925 76*

07 156.350 160.950 17*1156.850 156.850 27 157.350 161.950 67 156.375 156.375 77 156.875 156.875 87 157.375 157.375

08 156.400 156.400 18 156.900 161.500 28 157.400 162.000 68

09 156.450 156.450 19 156.950 161.550 37A*2157.850

10 156.500 156.500 20 157.000 161.600 60 156.025 160.625

†

Receive only

*1Channels 15 and 17 may also be used for on-board communications provided the effective radiated power does not exceed 1 W,

and subject to the national regulations of the administ *2UK Marina Channels: M1=37A (157.850 MHz), M2=P4 (161.425 MHz) for U.K. version only *3The use of these channels should be restricted to navigation-related communications only and all precautions should be taken to

avoid harmful interference to channel 16, e.g. by limiting the output power to 1 W or by means geographical separation.

Frequency (MHz)

22 157.100 161.700 62 156.125 160.725 72 156.625 156.625 82 157.125 161.725

157.85

Frequency (MHz)

156.42

5 156.425 78 156.925 161.525

5 156.475 79 156.975 161.575

156.47

†

70 156.525 156.525 80 157.025 161.625

Frequency (MHz)

156.825 156.825 86 157.325 161.925

Frequency (MHz)

88 157.425 157.425

161.425 161.425

ration concerned when these channels are used in its territorial waters.

• USA channels

Frequency (MHz)

Transmit Receive Transmit Receive Transmit Receive Transmit Receive Transmit Receive Transmit Receive

A 156.050 156.050 12

-- - - - - - - 13†156.650 156.650 23A 157.150 157.150 65A

A 156.150 156.150 14 156.700 156.700 24 157.200 161.800 66A 156.325 156.325

-- - - - - - - 15†156.750 156.750 25 157.250 161.850 67†156.375 156.375 80A 157.025 157.025 87A 157.375 157.375

A 156.250 156.250 16 156.800 156.800 26 157.300 161.900 68 156.425 156.425 81A 157.075 157.075 88

06 156.300 156.300 17

A 156.350 156.350 18A 156.900 156.900 28 157.400 162.000 70 156.525 156.525 83A 157.175 157.175

08 156.400

09 156.450 156.450 20 157.000 161.600 61A 156.075

10 156.500 156.500 20A 157.000 157.000 -- - - - - - -

11 156.550 156.550 21A 157.050 157.050 63A 156.175 156.175 74

†

Low power only

‡

Receive only

(for U.K. version only)

Frequency (MHz)

156.600 156.600 22A 157.100 157.100 64A 156.225 156.225 77 156.875 156.875 86 157.325 161.925

†

156.850 156.850 27 157.350 161.950 69 156.475 156.475 82A 157.125 157.125 88A 157.425 157.425

156.40

0 19A 156.950 156.950 37A* 157.850 157.850 71 156.575 156.575 84 157.225 161.825

Frequency (MHz)

156.275 156.275 78A 156.925 156.925 86A 157.325 157.325

‡

156.075 72 156.625 156.625 84A 157.225 157.225

73 156.675 156.675 85 157.275 161.875

156.725 156.725 85A 157.275 157.275

Frequency (MHz)

A 156.975 156.975 87 157.375 161.975

Frequency (MHz)

157.425 162.025

P4*

161.42

5 161.425

*UK Marina Channels: M1=37A (157.850 MHz), M2=P4 (161.425 MHz) for U.K. version only

• Survival operation channels

lennahC

R/XTrebmun

003.65160

zHM 005.65101

65186

651

zHM

056.65

008.65161

zHM 5

HM 526.65

zHM 5

ahCX

lenn

80zHM

37z

reb

mun

/XT

HM 004.6

zHM 055.651

HM 007.651

058.651

HM 574.6519

zHM 576.651

XR/XTrebmun lenna

M 006.65121

1*51

057.65

3.65176

527.651

HM 054.651

HM 575.6

op wol

si noisrev .A.S.U*

ylno rew

1 -

SECTION 2 INSIDE VIEWS

MAIN UNIT

•

TOP VIEW BOTTOM VIEW

S5V Regulator (Q561: 2SA1588)

T5V Regulator (Q323: 2SA1588)

IF amplifier (Q211: 2SC4215)

TX/RX swith (D91, D92: MA77)

Power amplifier

(*Q111: RD07MVS1)

Pre-drive

(*Q101: RD01MUS1)

R5 Regulator

(Q322: 2SA1588)

Antenna Switches *D131, D151: 1SV307 D152: MA2S077

RF amplifier (Q165: 3SK294)

VCO circuits

*Located in under the plate.

D/A converter IC (IC251: M62363FP-657C)

CPU IC661: PD78F0338 GC-9EB

EEPROM (IC591: BR24L32FV-W)

Reset IC (IC581: S-80942CNMC)

2 - 1

SECTION 3 DISASSEMBLY INSTRUCTIONS

REMOVING THE REAR PANEL

•

1 Remove the speaker panel A. 2 Unscrew 2 screws B, and remove 2 washers C. 3 Unscrew 2 screws D. 4 Unscrew 2 screws E, and remove 2 washers F. 5 Remove the rear panel and the main seal from the front

panel.

Note: When replacing the screws, 10–12 kg of torque MUST be applied to ensure water resistance.

Rear panel

Main seal

Front panel

7!2.).'.%6%2ATTEMPTTOREMOVETHESPEAKERPANEL

USINGYOURFINGERNAILSTHISMAYRESULTINJURLY 5SEAFLATHEADSCREWDRIVERORASIMILAR FLATINSTRUMENT

REMOVING THE CHASSIS UNIT

•

1 Unscrew 1 nut G. 2 Unscrew 2 screws H. 3 Take off the chassis unit in the direction of the arrow. 4 Unplug the connector I and the cable J from the

chassis unit.

5 Remove 1 washer K.

#)-





REMOVING THE MAIN UNIT

•

1 Unscrew 9 screws L. 2 Unsolder 2 points M, and take off the main unit in the

direction of the arrow.

Front panel

Chassis unit

Main unit

Chassis unit

3 - 1

SECTION 4 CIRCUIT DESCRIPTION

4-1 RECEIVER CIRCUITS

4-1-1 ANTENNA SWITCHING CIRCUIT

The antenna switching circuit toggles receive line and transmit line. This circuit does not allow transmit signals to enter the receiver circuits.

Received signals from the antenna are passed through the low-pass filter (LPF: L131, L132, C131–C136) and applied to the antenna switching circuit (D151, D152).

While receiving, no voltage is applied to D151 and D152. Thus, the receive line and the ground are disconnected and L151, L152, C151, C152 and C153 function as an LPF which leads received signals to the RF circuits.

4-1-2 RF CIRCUITS

The RF circuits amplify signals within the range of frequency coverage and filters off out-of-band signals.

The signals from the antenna switching circuit are passed through the two-stage tunable bandpass filter (BPF: D154, D155, L154–L156, C156, C157, C159–C161, C163, C164, C168), then applied to the RF amplifier (Q165).

The amplified signals are passed through another two-stage BPF (D181, D182, L166, L181 C181, C182, C184–C186, C188) to suppress unwanted signals. The filtered signals are then applied to the 1st mixer circuit.

The 1st IF signal from the 1st mixer is passed through the crystal filter (FI211) to suppress unwanted signals, and amplified at the 1st IF amplifier (Q211).

The amplified 1st IF signal is applied to the FM IF IC (IC231).

4-1-4 2nd IF AND DEMODULATOR CIRCUITS

The 1st IF signal is converted into the 2nd IF signal and de-modulated by the FM IF IC. The FM IF IC contains 2nd mixer, limiter amplifier, quadrature detector, etc. in its package.

The 1st IF signal from the 1st IF amplifier is applied to pin 16 of IC231, and mixed with the 30.6 MHz 2nd LO signal coming from the doubler (Q221), to convert into the 450 kHz 2nd IF signal and output from pin 3. The 2nd IF signal is filtered by the ceramic filters (FI231, FI232) to suppress the heterodyne noise, then applied to IC231 (pin 5) again and amplified at the limiter amplifier section and demodulated by the quadrature detector.

The quadrature detector is a detection method which uses a ceramic discriminator (X231). The demodulated AF signals are output from pin 9.

4-1-5 AF CIRCUITS

Demodulated signals are filtered and amplified at the AF circuits.

4-1-3 1st MIXER AND 1st IF AMPLIFIER CIRCUITS

The 1st mixer circuit converts received signals into the 1st intermediate frequency (IF) signal by mixing with local oscillator (LO) signal. The converted 1st IF signal is filtered at the 1st IF filter, then amplified at the 1st IF amplifier.

The signals from the two-stage BPF are converted into the

31.05 MHz 1st IF signal at the 1st mixer (Q191) by being mixed with the 1st LO signals generated at RX VCO (Q41, D31–D34).

• 2nd IF AND DEMODULATER CIRCUITS

"SQCON" signal from the D/A converter (IC251)

Noise

Active filter

detector

AF "DET" signal to the AF circuits

AMP

Limiter AMP

11109

X231

AF signals from IC231 (pin 9) are passed through the AF mute switch (IC281 A; pins 1, 2), analog switch (IC282; pins 1, 7), LPF (IC261 C; pins 8–10) and R801 (VR BOARD) to control the AF output level.

The level controlled AF signals are passed through the AF mute switch (Q411) and the de-emphasis circuit (R411, C413) to obtain the frequency characteristic of –6 dB/oct.

The de-emphasized signals are applied to the AF power amplifier (IC421, pin 4). The AF power amplifier provides more than 0.3 W of audio power.

450 kHz 2nd IF filters

FI232

D232

W/N SW

Noise

detector

W/N SW

D231

Noise

comparator

FI231

30.6 MHz 2nd LO signal

Mixer

×2

Q221

PLL

(IC1)

IC231 TA31136FN

"NOISV" signal to the CPU (IC661, pin 32)

R5V

1st IF signal from the IF amplifier (Q211)

15.3 MHz

4 - 1

4-1-6 SQUELCH CIRCUIT

Squelch circuit mutes AF output signal when no signals are received.

4-2-2 MODULATOR CIRCUIT

The modulation circuit modulates the VCO oscillating signal with the audio signals from the microphone.

A portion of the AF signals from the FM IF IC (IC231, pin 9) are applied to the IC251 to control the level, and the active filter (R239–R241, C237, C238). The filtered signals are applied to the noise amplifier section in the FM IF IC (IC231, pin 8) to amplify the noise components only.

The amplified noise components are detected at the noise detector section, and output from pin 14 as the "NOISV" signal to the CPU (IC661, pin 32). Then the CPU outputs "AFMS" signal from pin 84 according to the "NOISV" signal level to control the AF mute switch (Q411).

4-2 TRANSMITTER CIRCUITS

4-2-1 MIC AMPLIFIER, SPLATTER FILTER CIRCUITS

The MIC amplifier circuit amplifies audio signals from the microphone within +6 dB/oct pre-emphasis characteristics and amplifies to the level needed for modulation.

The AF signals from the microphone are passed through the microphone switch (Q461) and the microphone mute switches (IC682 A, pins 1, 2; IC682 B, pins 5, 6). The AF signals are then passed through the pre-emphasis circuit (R463, C463) to obtain frequency characteristics of +6 dB/oct.

The pre-emphasized AF signals are amplified at the microphone amplifier (IC261 B), and adjusted its level at the microphone gain control circuit (Q653, Q654, R474, R705, R707, R708). The level adjusted signals are applied to the limiter amplifier (IC491 A; pins 1, 2) to limit its level via the AF mute switch (IC481 A; pins 1, 2).

The AF signals are then passed through the splatter filter (IC491 B; pins 6, 7) to suppress unwanted 3 kHz and higher audio signals, then applied to the modulation circuit via the D/A converter (IC251; pins 3, 4).

AF signals from the D/A converter (IC251, pin 3) are applied to the modulation circuit (D39) to modulate the oscillated signal by changing the reactance of D39 at the TX VCO (Q51, D35–38).

4-2-3 TRANSMIT AMPLIFIERS

Transmit amplifiers amplify the TX VCO output to transmit power level.

The TX VCO output signal is buffer-amplified by the buffer amplifiers (Q61, Q62) and passes through the TX/RX switch (D91). The signals from the TX/RX switch are applied to the another buffer amplifier (Q91), pre-drive (Q101) and power amplifier (Q111) and amplified to the transmit level.

The power amplifier output is applied to the antenna connector (J41: CHASSIS UNIT) via the antenna switching circuit and the LPFs.

4-2-4 APC CIRCUIT

The APC (Automatic Power Control) circuit stabilizes transmit output power and controls transmit output power High, Middle and Low.

The RF output signal from the power amplifier (Q111) is detected at the power detector (D121). The detector converts the RF signals into DC voltage, and the detected voltage is applied to the APC amplifier (IC141, pin 3).

The transmit output power setting voltage is applied to another input terminal of the APC amplifier (IC141, pin 1) as the reference voltage. The APC amplifier controls the bias of the buffer, pre-drive and power amplifiers by comparing the detected voltage and reference voltage. Thus the APC circuit maintains a constant output power.

• APC CIRCUIT

T5V

RF signals from TX/RX SW

T1CON

Another power detector (D132) detects the RF output level and outputs "TDETV" signal to the CPU (IC661, pin 31). The CPU outputs "TLED" signal to the LED driver (Q655) to light TX LED (DS655).

VCC

Powe r AMP

Q111

D121

LPF

ANT

D132

LPF

To ANT

TDETV

Q91

Buffer AMP

IC141

APC AMP

–

Q101

Predrive

4 - 2

4-3 PLL CIRCUITS

4-3-1 GENERAL

PLL circuits control TX and RX VCO circuits. IC1 is a PLL IC and contains prescaler, programmable counter, programmable divider, phase detector, charge pump in its package.

The VCOs directly generate the transmit frequency and the 1st LO frequency for receiving. The PLL sets the divided ratio based on the serial data from the CPU (IC661), and compares the phase of the VCO output with the reference oscillator's frequency (15.3 MHz) oscillated by X1.

If the oscillated signal drifts, the phase of its frequency changes from the phase of the reference frequency, causing a lock voltage change to compensate for the drift in the oscillated frequency.

4-3-2 TRANSMIT LOOP

A portion of the generated signal at the TX VCO (Q51, D35– D39) is applied to the PLL IC (IC1, pin 8) via buffer-amplifier (Q71). The applied signal is divided at the prescaler section and programmable divider section and is then applied to the phase detector section.

The phase detector compares the input signal with the reference frequency, and then outputs the control signal (pulse-type) from pin 5 via the charge pump section. The pulse-type signal is converted into DC voltage at the loop filter (R17–R19, C16, C17), and then applied to the TX VCO (Q51, D35–D39) as the lock voltage.

The phase detector compares the input signal with a reference frequency, and then outputs the control signal (pulse-type) from pin 5. The pulse-type signal is converted into DC voltage at the loop filter (R17–R19, C16, C17), and then applied to the RX VCO (Q41, D31–D34) as the lock voltage.

4-3-3 RECEIVE LOOP

The generated signal at the RX VCO (Q41, D31–D34) is applied to the PLL IC (IC1, pin 8) via buffer-amplifier (Q71) and is divided at the prescaler section and programmable divider section and is then applied to the phase detector section.

• PLL CIRCUITS

RX VCO

Buffer

"LOINV" signal to the CPU (IC661, pin 34)

30.6 MHz 2nd LO signal to the FM IF IC (IC231, pin 2)

Q221

Loop

filter

×2

Q41, D31–D34

TX VCO

Q51, D35–D39

Charge

pump

Phase

detector

Programmable

divider

Buffer Q61

IC1 MB15A02PFV

Prescaler

Shift register

Buffer Q62

Buffer Q71

D92

to 1st mixer circuit

D91

to transmitter circuit

LPF

SCLK

S DATA O

PLSTBO

PLL control signals from D/A converter (IC251, pins 6–7)

15.3 MHz reference signal from reference frequency osciilator (X1)

4 - 3

4-4 POWER SUPPLY CIRCUITS

4-4-1 VOLTAGE LINES

LINE DESCRIPTION

The voltage from the connected DC power

VCC

CPU5V

M5V

T5V

S5V

R5V

supply passed through the [VOL] switch (R1: VR BOARD).

5V for the CPU (IC661) converted from the VCC line at the CPU5V regulator circuit (IC551).

Common 5V line converted from the VCC line at the M5V regulator circuit (Q551–Q553).

5V for the transmit circuits controlled by the T5V control circuit (Q323) using the T5VS signal from the CPU (IC661, pin 90).

5V for the AF circuits controlled by the S5V control circuit (Q561) using the S5VS signal from the CPU (IC661, pin 87).

5V for the receive circuits controlled by the R5V controll circuit (Q322) using the R5VS signal from CPU (IC661, pin 89).

4-5 PORT ALLOCATIONS

4-5-1 CPU (IC661)

NUMBER

1 BEEP

3 EXSTB

4 DASTB

5 PLSTB 6 ERXDI

7 ETXDO 10 SDATA 11 SCK 12 ESCK 13 ESDA 14 TLED 15 RLED 17 CSIFT 25 RESET 27 WDECV

28 EXDET

29 VOXT

30 BATTV

31 TDETV 32 NOISV 33 RSSIV 34 LOINV 35 TEMPV

75, 76 CONT1, CONT2

PORT

NAME

DESCRIPTION

Output port for BEEP signal.

Output port for external expander strobe signal.

Output port for external D/A strobe signal.

Output port for PLL strobe.

Input port for cloning.

Output port for cloning.

Output port for serial data.

Output port for serial clock.

Input port for EEPROM clock.

I/O port for EEPROM data.

Output port for TX LED driver.

Output port for RX LED driver.

Output port for clock shift signal.

Input port for reset signal.

Input port for WX tone signal.

Input port for the [MIC/SP] detect signal. Input port for VOX signal.

Input port for battery voltage detection signal.

Input port for TX power level.

Input port for noise level.

Input port for RSSI level.

Input port for PLL lock voltage level.

Input port for temperture level.

Output ports for LCD contrast control signal.

NUMBER

PORT

NAME

77, 78 LEDS1, LEDS2

80 MICMS

81 ISPMS

84 AFMS

85 AFVS

102 PTTIN 103 EXPTT

104 BTYPE

105 PTTM

106–108 MIC1–MIC3

109 SQL 110 UP 111 DOWN 112 CH/WX 113 16/9 114 SCAN 115 H/L

117 VOXM

119 UNLK

4-5-2 EXPANDER (IC341)

NUMBER

6 DETMS

11 ATTS

12 TXMS

13 VCOS

14 SQLT

PORT

NAME

DESCRIPTION

Output port for dimmer control signal.

Output port for microphone mute signal. "HIGH": Microphone mute

Output port for internal speaker mute signal. "HIGH": Speaker mute

Output port for AF mute signal.

Output port for AF amplifier power supply control signal.

Input port for [PTT] switch.

Input port for external PTT switch.

Input port for battery type detection.

Output port for microphone mute signal.

Output ports for microphone sensitivity detection signal.

Input port for [SQL] key. Input port for [Y] key. Input port for [Z] key.

Input port for [CALL] key.

Input port for [16] key.

Input port for [CH] key.

Input port for [Hi/Lo] key.

Ouput port for mute signal in VOX mode.

Input port for PLL unlock signal.

DESCRIPTION

Output port for DET mute signal.

Output port for RF attenuator control signal.

Output port for TX mute signal.

TX/RX VCO switching signal.

Output port for squelch control signal.

4 - 4

+ 23 hidden pages

Icom IC-GM1600E, IC-GM1600 User Manual

INTRODUCTION

TABLE OF CONTENTS

SECTION 1 SPECIFICATIONS

SECTION 3 DISASSEMBLY INSTRUCTIONS

• PLL CIRCUITS