Taking the Icom IC-R75 To The Extreme (c) Bjarne Mjelde, June 2004 (additions December 2004) www.kongsfjord.no Admittedly, the headline was perhaps more for trigging the reader's curiosity than being entirely true. But there is some truth in it; first a brief intro for those who do not know me: I am a MW DX-er who lives at 71N, 29E in the NE part of Norway, near the Russian border. I have made a habit of calling my self "The World's Northernmost DX-er" so far unchallenged :-) I have been in the radio listening "business" since 1972. Today I own one NRD-525, one MW-modified Icom IC-746Pro, one IF-deck modified EAC R-390A, one Racal RA6790/GM, and the R75 with all Kiwa mods including the 4.2 AM filter. Hence the headline. This area is extremely quiet RF wise (with one important exception which I will address later). So, I am (probably) not only the world's northernmost DX-er, I am also (probably) the world's northernmost Icom IC-R75 owner. As you might have guessed, this quasi-review will deal mostly with MW. Over the past week, I have had a few opportunities to test the R75, and compare it to my other receivers. The antenna has been a BOG (beverage-on-ground, lowered from normal height during summer since this is reindeer pasture) of some 450 meters, directed towards 058 degrees (from my perspective, it points towards far east Asia and "far west Europe", i.e. western Norway and the UK.) With my latitude at almost 71N, you will know that darkness is non-existent here during summer. This would seem to be a bad setting for testing MW performance however close to midnight the sun's angle above the horizon is so low that quite a few MW signals are able to get through even from Asia, although only high-powered stations as such (Taiwan-1557, various China Nat'l Radio frequencies). Middle-East and Eastern European stations are also available but usually at a low signal level. So, no good for DX but excellent for testing sensitivity! General opinions I will not go into detail as the aspects of the receiver have been covered by other, more skilled reviewers than me. Basically, I like the user interface. So what could be made better? Memories: 99 (or 102, depending on perspective) is at least 300 short. I would want to store all MW frequencies, both the 10 kHz step frequencies and the 9 kHz step frequencies. This would make manual scanning easier. The tropical band DX-er would probably want to store all Indonesian/Papuan frequencies, and maybe all South American frequencies in addition. The NRD545 for instance has 1000 memory positions, and there is really no reason why any other receiver should have less. Tuning steps: Luckily, Icom has implemented an excellent feature here, so the lack of memories is compensated to a degree. I often change tuning steps (especially 9 and 10 but also 1 and 5 kHz), so I miss that the chosen tuning step is not displayed. Often I forget which tuning step I use, or I go directly from MW to a SW frequency, so when I tune the wheel I may go from say 6160 to 6151. One workaround might have been to store tuning steps with the memory setting. If so, I could pick MEM-1 as 1700 with 10 kHz steps, and then I could go downwards from there with the correct steps. MEM-2 could have been 1701 or 1602 with 9 kHz steps etc. Unfortunately, this is not possible.
AGC: Based on a few hours of listening, I find that the Slow AGC is not as good as the Slow AGC (modified) on the NRD-525 or R-390A. It does not ease out selective fading as well as it should. Fast AGC seems to be ok but I tend to use Slow AGC for all purposes except if I really need Fast AGC. AM-Sync: The Kiwa-modified sync seems to work well for enhancing readability on weak stations (not much difference on strong stations). However, on extremely weak stations it seems to take forever to lock sometimes it simply won't. Sometimes I can "help it on its way" by adjusting the PBT somewhat. So then, how does it fare when the going gets tough? Selectivity-wise, I have had few chances to compare it to the other receivers. However, the general picture is that my bandwidths are good. The 6 kHz ("Wide") sounds somewhat wide, but Kiwa informed me that the 6 kHz filter is really more like 7 or 8 kHz. That matches with what I hear. Instead of the Kiwa Premium Filter 3.8 kHz I had Craig install a CFJ455K4 filter instead. This is an excellent filter with a near-perfect combination of fidelity and interference-killing. It is used for SSB wide. The filter bank seems very well balanced for my usage. Sensitivity is probably the single most important factor for this area with extremely low signal levels. My NRD-525's measure 0.4 to 0.5uV (AM 6 kHz, 30% mod) on MW, and the NRD-545 has been measured to similar values by QST. So then, this was the reference numbers any less and the R75 would be a disappointment. Based on listening tests only, I can say that with the Preamp 1 set, the R75 matches the NRD-525's. With Preamp 2 set, it resolves audio better than the NRD's (and in fact in many cases better than my R-390A, but the latter is still not properly aligned and trimmed so it is too early to be conclusive on the R75 vs. R-390A comparison). The difference is of course audible only when the signal fades in or out of the noise floor, and when there are no other RF sources available that would increase the noise floor. Also, it seems that the difference is only there when the noise floor is "really low" as it were, i.e. during quiet geomagnetic conditions. Conclusion: The (full MW Att mod) R-75 is, in combination with the preamps, sensitive enough for my use. Without the use of the preamps, it does lack some sensitivity compared to my other receivers. I don't know if any have made sensitivity measures of the full MW Att modded R-75's. My guess, based on listening and knowing what my other receivers measure, is that the AM, 6 kHz, 30% non-preamp sensitivity is around 1uV. 6dB extra net gain (preamp 1) would bring it down to 0.5uV, and it sounds like that is where it is. Only guesses, of course. What about strong signal handling then? Well do I need that, in my RF free environment? Actually, yes I do. I have a Loran C station some 14 km away from my QTH, which emits 250kW on 100 kHz. While it doesn't usually affect MW DX if excellent equipment is used, we know that heavy amplification of signals also reduces the IP3 and IP2 of the receivers involved. While the R-75's front-end is far from bulletproof, it seems to cope quite well. I have tested it while fed from a splitter with 10dB amplification AND Preamp 2 connected. It did quite well, although on some frequency ranges usually infected by the Loran C station (such as 550-580 kHz) there was some interference. A single, weak signal on a frequency is one thing, how does it cope with multiple signals then? This is the point where I feel that the NRD's fare better. 3 or 4 signals of roughly equal strength have a tendency of "mixing" into unintelligible babble, whereas my AGC-modified 525 and the R-390A seem to resolve the individual station's audio better. Maybe this is an AGC issue. Otherwise, audio is good. Connected to a vintage Tandberg 4 ohm external speaker, audio in AM Wide (6 kHz nominal) is quite good. The hissy audio often heard with the NRD-525 is not there.

Economy: Many have pointed out the low price of the R75. I bought mine from Universal Radio who shipped it to Kiwa USD 515 including shipping. Kiwa's mods + shipping to Norway added another USD 260. Even after adding Norwegian VAT, it is a bargain compared to any receiver available. Will I buy another? This question is of course the "ultimate test" of a receiver. It is a bit too early to say. The coming autumn's DX will decide. If it performs as well as it seems in really tough DX situations, the answer is Yes. It seems that the Kiwa mods (especially the MW Att mod and more suitable filters) are necessary, but my preliminary conclusion is that judging from several parameters, the R75 is an excellent receiver for real DX purposes. And quite good for normal program listening as well. It will be interesting to put it side by side with a properly aligned and modified R-390A later on. If you want to know more about this area and DX in the Arctic, please visit http://www.kongsfjord.no/. Addendum per December 2004. Will I buy another? Was the question raised above? After having had an autumn full of DX-ing, I have had time to compare the R75 with my other receivers. The answer is no. I will not buy another. It is not because it's not a good radio; it's just that the competition (in my shack) is too tough. It has had to fight a modified R-390A and a modified IC-746Pro. It does well, but not well enough. During demanding DX situations with strong interference, it does seem to have poorer audio recovery then the others. Also, it seems to handle interference somewhat less elegantly than the R-390A and 746Pro (and a modified NRD-525 that is also in my shack). It works best when used in AM mode. In ECSS mode, the audio is too flat in my ears, needing constant twiddling of the PBT controls to maintain fidelity. Other demanding DX-ers have reached different conclusions, pointing out that narrowing the roofing filter can have impact in certain situations. It would be fair to say though, that correctly modified (see The Dallas Files on www.kongsfjord.no), the R-390A and the IC-746Pro are perhaps two of the best MW DX-receivers available for any price. In that light, the R75 is an excellent choice for most serious DX-ers, especially given its portability and price tag.

All stated specifications are subject to change without notice or obligation.

SECTION 2

INSIDE VIEWS

MAIN UNIT

1st mixer circuit

PLL UNIT

2nd mixer circuit 1st IF filter (FI701)

Fuse (3A)

VCO circuit
PLL IC (IC21) Bandpass filter 2nd IF circuit Noise blaker circuit Back up battery (BT 1521) 3rd IF filter (FI851) 2nd IF filter (FI761: FL-272) 3rd LO circuit 3rd mixer circuit (IC811) BFO mixer circuit (IC1101) BFO circuit
SECTION 3 CIRCUIT DESCRIPTION

3-1 RECEIVER CIRCUITS

3-1-1 RF SWITCHING CIRCUIT (MAIN UNIT)
The IC-R75 has two antenna connectors. RF signals enter either the [50 ANT.] or [450 ANT.] connector. RF signals from the [50 ANT.] connector are applied to the antenna switching circuit (RL121), and then pass through the low-pass filter (L131, L132, C131C136). RF signals from the [450 ANT.] connector are passed through the L101 to exchange the impeadance value, and are then applied to the antenna switching circuit (RL121). The signals are applied to the low-pass filter (L131, L132, C131C136). Each RF signals from the [50 ANT.] connector or [450 ANT.] connector are chosen by the antenna switching circuit (RL121). (1) Below 1.6 MHz The signals are applied to the low-pass filter consisting of C170C175, L171L173 via the limitter circuit (D141, D142). A diode is removed at the entrance of the low-pass filter. This device prevents the diode from causing distortion when receiving very strong signals. A switching diode (D172) is turned on when the B0 line is HIGH. (2) Above 1.6 MHz The signals are applied to the high-pass filter consisting of C161C163, L161L164. This filter suppresses strong signals below 1.6 MHz such as broadcasting stations. The filtered signal between 1.6 MHz and 2.0 MHz are applied to the low-pass filter (C182C187, L182, L183) via the switching diode (D181). The switching diodes (D181, D182) are turned ON when the B1 line is HIGH. The filtered signals above 2.0 MHz are applied to one of 8 bandpass filters depending on the receive frequencies. After passing through a bandpass or low-pass filter, the signals are applied to the pre-amplifier circuit (Q381, Q382, IC391). (3) FILTER SWITCHING CIRCUIT The RF bandpass filter corresponds to the BPF switching voltage (B0B9) based on the CPU via the shifit registor (IC551, IC552) and driver (IC561, IC562). The switching voltage of the BPF exit ot improve multi-signal and strong signal characteristics.
3-1-2 RF FILTER CIRCUIT (MAIN UNIT)
The filtered signals are applied to the RX attenuator switching circuit (RL141). Either the signals bypass or pass through the attenuator circuit. The signals are attenuated at 20 dB when passing through the attenuators. The attenuator system excludes non-linear components between an antenna connector and an attenuator to prevent strong signals from causing distortion. The signals are then applied to the RF filters. The MAIN UNIT has 8 RF bandpass fileters for signals above 2.0 MHz and 2 low-pass filters for signals below 2.0 MHz.

3-1-8 BFO CIRCUIT (PLL UNIT)
The BFO (Beat Frequency Oscillator) circuit consists of Q1, X1, Q201 and IC 201 on PLL unit. The oscillator provides a beat frequency signal to the SSB demodulator circuit (MAIN UNIT; IC1101) for demodulating the 3rd IF signal into an AF signal. The 30 MHz signal is oscillated at Q1 and X1 for the system clock signal of the DDS IC (IC201). The oscillated signal is amplified at Q201 and is applied to the DDC IC (IC201, pin 7) to produce the 455 kHz BFO signal. The 455 kHz signal passes through the low-pass filter (L201, L202, C202C207) via the D/A converter, and is then mixed with the 3rd IF signal at the SSB demodulator circuit (MAIN unit; IC1101).
3-1-7 3RD MIXER AND IF CIRCUITS (MAIN UNIT)
The 2nd IF signal is mixed with a 9.4665 MHz 3rd LO signal to produce a 450456 kHz 3rd IF signal at the 3rd mixer (IC811). 3RD IF FREQUENCY MODE LSB, USB CW RTTY AM, S-AM
3-1-9 DEMODULATOR CIRCUIT (MAIN UNIT)
The demodulator circuit consists of 3 detector circuits. (1) SSB DEMODULATOR CIRCUIT A product detector (IC1101) demodulates SSB, RTTY and CW signals into an AF signal. The 3rd IF signal from the IF amplifier (Q911) is mixed with the BFO signal at the product detector (IC1101) to be demodulated into an AF signal. The AF signal passes through the AF input mode selector switch (IC1201). (2) FM DEMODULATOR CIRCUIT A FM detector (IC1001, X1001) demodulates the FM signal into an AF signal. The 3rd IF signal from the IF amplifier (Q891) is amplified at the 3rd IF amplifier (Q1001), and is then applied to the FM detector (IC1001, X1001) to demodulate the 3rd IF signal. The demodulated signal is applied to the de-emphasis circuit (IC1211D) to produce the FM AF signal. The AF signal passes through the AF input mode selector switch (IC1201).
FREQUENCY 455.0 kHz 455.9 kHz 456.0 kHz 450.0 kHz
The 9.4665 MHz 3rd LO signal is applied to the 3rd mixer IC (IC811, pin 10) from the PLL unit via J811. The 450456 kHz 3rd IF signal is applied either to one of the 3 ceramic bandpass filters (FI851, FI861, FI871) or to an optional crystal bandpass filter to suppress unwanted signals. When the [FIL] switch is turned 3F3K, the filter is selected FI851 which covering the 2.4 kHz bandwith.
The FM detector outputs FMNL signal from IC1001, pin 14 is applied to the CPU (LOGIC unit; IC101, pin 94) to control the noise squelch level.
(3) AM DEMODULATOR CIRCUIT The AM demodulater circuit (IC2001) has the envelope detect function and the synchronous detect function. An AM detector (IC2001) demodulates the AM signal into an AF signal. The 3rd IF signal from the IF amplifier (Q911) is amplified at the buffer amplifier (Q1031), and is then applied to the AM demodulater circuit (IC2001)to demodulate the 3rd IF signal into the AM AF signal. The AF signal which is the AM envelope detect the AF signal or the AM synchronous detect AF signal passes through the AF input mode selector switch (IC1201).

3-2 PLL CIRCUITS

3-2-1 GENERAL DESCRIPTION
The PLL unit generates a 1st LO signal (69.0415129.0115 MHz variable), 2nd LO signal (60 MHz), 3rd LO signal (9.4665 MHz) and BFO signal (455 kHz) used in the MAIN unit. The IC-R75 uses a DDS (Direct Digital synthesizer) system. The DDS system provides rapid lockup time and high quality frequency oscillation.
3-1-12 AGC AND S-METER CIRCUITS (MAIN UNIT)
The AGC (Automatic Gain Control) circuit reduces signal fading and keep the audio output level constant. The receiver gain is determined by voltage on the AGC line (Q1063, collector). When strong signals are received, the AGC circuit decreases the voltage on this line. The 3rd IF signal is amplified at the IF amplifier (Q911). A portion of the 3rd IF signal is applied to the buffer amplifier (Q1031) to convert the impedance. The amplified IF signal is detected at the AGC detector (D1061) via the C1061, and enters the base of the AGC amplifier (Q1063) to control the voltage on the AGC line.
3-2-2 REFERENCE OSCILLATOR CIRCUIT (PLL CIRCUIT)
The 30 MHz reference oscillator circuit consists of X1 and Q1. The 30 MHz reference frequency is oscillated to produce all of the LO signals.
3-2-3 1ST LO CIRCUIT (PLL AND MAIN UNIT)
The 30 MHz reference frequency is applied to the DDS-IC (PLL unit; IC21, pin 40) to oscillate the 1st LO signal. The reference frequency is compared to the DDS output signal (PLL unit; IC21, pin 46) to oscillate the PLL lock voltage. The PLL lock voltage controlls the oscillate frequency of the VCO1 and VCO2 circuit.
The oscillated signal at the VCO1 and VCO2 circuit is amplified at the LO-amplifier (PLL unit; Q91), and passes through the low-pass filter (PLL unit; Q92, D91, D92, L91, L93, C96C100, C102, C103) to supperss high harmonic components. The low-pass filter controlls the cut-off frequency of less than 29.999 MHz and more than 30.000 MHz by switching C102 and C103 ON and OFF respectively. The filtered signal is applied to the LO-amplifier (MAIN unit; Q411), and is then applied to the 1st mixer circuit (MAIN unit; Q441, Q442) via the low-pass filter (MAIN unit; L421, L422, C422C425). The reference frequency from the LO-amplifier (PLL unit; Q91) is also divided by 4 at IC22, and is amplified at the IC23. The signal is applied to the DDS-IC (PLL unit; IC21, pin 88) for the clock signal.
3-2-6 BFO CIRCUIT (PLL AND MAIN UNIT)
The 30 MHz reference frequency is amplified at the Q201 on the PLL unit, and is applied to the 10 bits DDS-IC (PLL unit; IC201, pin 7) for the clock signal to produce the 455 kHz BFO signal. The BFO signal is applied to the D/A converter circuit, and passes through the low-pass filter (PLL unit, L201, L202, C202C207) to suppress spurious components. The filtered 455 kHz BFO signal is applied to the BFO mixer circuit (MAIN unit; IC1101, pin 10).

3-2-7 VCO CIRCUIT

The VCO circuit consists of the VCO1 circuit (PLL unit; Q71, Q72, D71) and VCO2 circuit (PLL unit; Q81, Q82, D81). The VCO1 controls less than displayed frequency of 29.999 MHz to use the PLL lock voltage from the DDS-IC. The VCO2 controls more than displayed frequency of 30.000 MHz to use the PLL lock voltage from the DDS-IC.

PWRK DUD DAST RSTB ISTB ASTB ECS MCK MDAT

BEEP RXS

PCK PST1 PDAT PST2 PST3 SSBK CWK AMK FMK FILK TSK PREK ATTK NRK ANFK NBK AGCK VMK
SECTION 4 ADJUSTMENT PROCEDURES

4-1 PREPARATION

REQUIRED TEST EQUIPMENT

EQUIPMENT

DC power supply

GRADE AND RANGE

Output voltage Current capacity : 13.8 V DC : 2 A or more
Oscilloscope AC millivoltmeter External speaker Standard signal generator (SSG)
Frequency range Measuring range Measuring range Input impedance Capacity Frequency range Output level : DC20 MHz : 0.0120 V : 10 mV10 V :8 : 4 W or more : 0.1300 MHz : 0.1 V32 mV (127 to 17 dBm)

Frequency counter

Frequency range : 0.160 MHz Frequency accuracy : 1 ppm or better Sensitivity : 100 mV or better Frequency range Measuring range Input impedance : 0.160 Hz : 0.0110 mV : 50 k/V DC or better
Audio generator DC Voltmeter

CONNECTION

NOTE: The [450 ] ANT jack is not used for adjustment
AC milli-voltmeter Terminator for the entering adjustment mode
Standard Signal Generator DC power supply 13.8 V / 10A

Speaker

1/8" (3.5 mm) 2-conductor plug Shorten inner and outer plugs
DC IN 50 ANT 450 ANT EXT SP REMOTE connector

4-2 PLL ADJUSTMENT

ADJUSTMENT ADJUSTMENT CONDITION MEASUREMENT UNIT REFERENCE 1 Displayed frequency : 29.99999 MHz FREQUENCY Mode : USB 2 VCO VOLTAGE 1 Displayed frequency : 29.99999 MHz Mode : USB 2 Displayed frequency : 0.03000 MHz Mode : USB 3 Displayed frequency : 60.00000 MHz Mode : USB 4 Displayed frequency : 30.00000 MHz Mode: USB 1ST LO VOLTAGE 3RD LO VOLTAGE 1 Displayed frequency : 3060.00000 MHz Mode : USB 1 Displayed frequency : 3060.00000 MHz Mode : USB PLL PLL PLL LOCATION Connect the fre- 60.00000 MHz quency counter to P1. Connect the RF Maximum voltage voltmater to P1. Connect the DC 4.0 V voltmeter to HCP71. More than 0.8 V PLL VALUE ADJUSTMENT POINT UNIT PLL ADJUST L2

L4, L5 C86

Verify

More than 0.8 V

Connect the RF More than 0.18 V voltmeter to P91. Connect the RF More than 0.022 V voltmeter to P91. Connect the fre- 9.46149.4616 MHz quency counter to P151. Connect the RF More than 0.022 V voltmeter to P201. Less than 280 V
1 Displayed frequency 3RD LO : 9.4615 MHz FREQUENCY Mode : FM BFO VOLTAGE 1 Displayed frequency : 14.100000 MHz Mode : USB 2 Displayed frequency : 14.100000 MHz Mode : AM

Verity

*This output level of the standard signal generator (SSG) is indicated as SSGs open circuit.

PLL UNIT

1st and 3rd LO voltage check point
C76 VCO voltage adjustment C86

VCO voltage check point

Reference frequency check point

L4 L5 L2

Reference frequency adjustment (for output voltage is maximum)

Reference frequency adjustment (for output frequency is 60.0000 MHz)
3rd LO frequency check point

BFO voltage check point

4-3 RECEIVER ADJUSTMENTS
ADJUSTMENT ADJUSTMENT CONDITION MEASUREMENT UNIT 1 Displayed frequency RECEIVER : 14.10000 MHz SENSITIVITY Mode : USB PREAMP1 : ON ANT select : ANT1 AGC : FAST NOISE BLANKER : OFF RF/SQL : CENTER PBT1/PBT2 : CENTER IF FILTER1 : 2.4 kHz IF FILTER2 : 2.4 kHz 2 Connect an SSG to the antenna connector1 and set as: Frequency : 14.10150 MHz Level : 22 V* (13 dB) Modulation : OFF Receiving Rear Panel LOCATION Connect the AC Pre-set to center milli-volt meter to the [EXT SP] jack with an 8 load. VALUE ADJUSTMENT POINT UNIT MAIN ADJUST R444 R898

Maximum output level

L443, L461, L462, L471, L701, L711, L712, L891, L892, L911 L443, R444

1ST MIXER BALANCE

1 Displayed frequency : 0.10000 MHz PREAMP1 : OFF set an SSG level as : OFF Receiving

Rear panel

Connect an oscillo- Minimum noise level scope to the [EXT SP] jack with 8 load.

MAIN UNIT EXT SP JACK

Receiver sensitivity and 1st mixer balance check point

R444 L443

1st mixer balance adjustment
L701 L711 L712 L471 L462 L461 L443 L891 L892 L911 R893 R444
Receiver sensitivity adjustment
Pre-set to center before receiver sensitivity adjustment
RECEIVER ADJUSTMENTS (continued)
ADJUSTMENT 1ST IF FILTER ADJUSTMENT CONDITION MEASUREMENT UNIT 1 Displayed frequency : 14.10000 MHz Mode : FM PREAMP1 : ON IF FILTER1 : 15 kHz IF FILTER2 : 6 kHz set an SSG as Frequency : 14.10000 MHz Level : 0.32 V* (10 dB) Deviation : 3.5 kHz Modulation : 1 kHz Receiving 1 Displayed frequency : 14.10000 MHz Mode : USB PREAMP1 : OFF IF FILTER1 : 2.4 kHz IF FILTER2 : 2.4 kHz Set an SSG as Frequency : 14.10150 MHz Level : 500 V* (54 dB) Modulation : OFF 2 Set an SSG level as : OFF Receiving
ADJUSTMENT POINT UNIT MAIN ADJUST L461, L462
LOCATION Connect the AC Maximum output level milli-volt meter to the [EXT SP] jack with an 8 load.

RECEIVER TOTAL GAIN

Connect the AC 0 dB milli-volt meter to (1.0 V) the [EXT SP] jack with an 8 load.

Front panel

[AF GAIN] control

30 dB (10 mV)

1st IF filter and receiver total gain check point

L462 L461

1st IF filter adjustment
Receiver total gain adjustment
RECEIVER ADJUSTMENTS (CONTINUED)
ADJUSTMENT NOISE BLANKER ADJUSTMENT CONDITION MEASUREMENT UNIT 1 Displayed frequency : 14.10000 MHz Mode : USB Noise Blanker : OFF PREAMP1. : ON Set an SSG as Frequency : 14.10000 MHz Level : 18 V* (25 dB) Modulation : OFF 2 Apply the following signal to the [ANT1] connector

100 msec.

ADJUSTMENT POINT UNIT MAIN ADJUST R736 L731, L732
LOCATION Connect the oscillo- Pre-set to center scope to the check Minimun voltage point CP731.

4030008630

S.CERAMIC S.CERAMIC S.TANTALUM S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.ELECTROLYTIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC
C1608 JF 1C 104Z-T-A C1608 JF 1C 104Z-T-A TEMSVA 1A 106M-8L C1608 JF 1C 104Z-T-A C1608 JF 1C 104Z-T-A C1608 CH 1H 200J-T-A C1608 CH 1H 220J-T-A C1608 CH 1H 300J-T-A C1608 CH 1H 300J-T-A C1608 JF 1C 104Z-T-A C1608 JF 1C 104Z-T-A C1608 JF 1C 104Z-T-A C1608 JF 1C 104Z-T-A C1608 JF 1C 104Z-T-A C1608 JF 1C 104Z-T-A C1608 JF 1C 104Z-T-A C1608 JF 1C 104Z-T-A C1608 JF 1C 104Z-T-A C1608 JF 1C 104Z-T-A C1608 JF 1C 104Z-T-A C1608 JF 1C 104Z-T-A C1608 JF 1C 104Z-T-A C1608 JF 1C 104Z-T-A C1608 JF 1C 104Z-T-A ECEV0JA220SR GRM39 B 224K 10PT GRM39 B 224K 10PT C1608 CH 1H 220J-T-A C1608 JF 1C 104Z-T-A

W3 W4 W5

8900008930 CABLE 8900008940 CABLE 8900007000 CABLE

OPC-885 OPC-886 OPC-684

8600036530 CABLE

RX2240 P01FR

EP1 EP2
6910012480 E.OTHER 6450001230 E.OTHER
RMS20-250-201-1R HLJ0999-01-480

[DISPLAY BOARD]

1140005130 S.IC

HD66100F

Q11 Q21 Q31 Q41 Q51 Q61

1530002850 1530002850

2SC4116-BL (TE85R) 2SC4116-BL (TE85R) 2SC4116-BL (TE85R) 2SC4116-BL (TE85R) 2SC4116-BL (TE85R) 2SC4116-BL (TE85R)

Q71 Q81

[MAIN UNIT]
IC1371 IC1391 IC1401 IC1411 IC1601 IC1602 IC1603 IC1751 IC1771 IC2001
IC S.IC S.IC S.IC S.IC S.IC S.IC S.IC S.IC S.IC
PQ30RV31 TA7808F (TE16L) TA7805F (TE16L) PC1555G2-T1 BU4094BCFV-E2 BU4094BCFV-E2 TD62783AF (TP1) DS14C232TM TC7W04F (TE12L) MC13022ADWR3
1530002850 S.TRANSISTOR 2SC4116-BL (TE85R) 1530002850 S.TRANSISTOR 2SC4116-BL (TE85R) MCR10EZHJ 330 (331) ERJ3GEYJ 221 V (220 ) MCR10EZHJ 330 (331) ERJ3GEYJ 221 V (220 ) MCR10EZHJ 330 (331) ERJ3GEYJ 221 V (220 ) MCR10EZHJ 330 (331) ERJ3GEYJ 221 V (220 ) MCR10EZHJ 330 (331) ERJ3GEYJ 221 V (220 ) MCR10EZHJ 330 (331) ERJ3GEYJ 221 V (220 ) MCR10EZHJ 330 (331) ERJ3GEYJ 221 V (220 ) MCR10EZHJ 330 (331) ERJ3GEYJ 221 V (220 )

R55 C51

+ C71 +

+C126 +

C108 R113 D1

R10 C326

C30 R47

R48 R49

R54 C50 C29 C28

C55 C58

R50 R51

C36 C25

EP4 C23 EP5

C27 C26

EP3 EP2
C56 C43 C39 R28 R27 R29 R30 R31 R32 R33 R34 R35 C37 C44 C38 R26 R25 R24 R23 R36 R37 C41 C40 C42

C12 C13 C11

R6 C1 C8

R7 C7 R5 R8

R21 C9 R9

L1 X1 MP1

C6 R3 R2 Q1 C16 C3 R4 C4 R1
R170 R172 R171 C153 C152 R161

R169 R160

R168 R159

R167 R158

R162 C154 C155 R163

C156 R183 C157 W1 C164

R152 R151 C151

C321 C317 C318 R178

C320 C322

C310 C311 C312 C313

14V 8V 5V RECS GND PST2 PCO2 PDAT
14V GND AAFO UNLC PST3 PST1 PCK DRES
C314 R222 R221 C203 C202 C315 C316 R212 R213 C204 C205 C207 W2

R220 R211

R219 R210

R218 R209

R217 R208

R216 R207

R215 R206

R214 R205

R203 R204

L201 L202

C206 R233 C214

R202 R201 C201

J2 to MAIN unit J1501

R232 R231

8-5 MAIN UNIT
C1293 C1294 R1258 C1259 C1257 R1259

2 J1231

IC1291 C1296
R1262 R1263 R1261 C1292 R1293 R1291 R1292 C1282 C1261 IC1251

JAFE DAFO 1

R1236 R1235

GND GND 5V MDTR DITR

GND DSSR MCKR DSTR DRSR
from optional unit UT-106

IC1371

C1374 C1372 R1372 C1373 C1352

D1351 C1353

[DC 1N]

F1351 F1352

C133 C132 L132 C1351

R1371 C1371

R1233 R1231

D1371 R1351 R1374

IC1281
C1262 R1281 R1260 C1260 R1256 C1255 C1253 R1253 R1254
D301 C321 L321 L341 C164 L342 C341 C342 L343 L323 C344 C345 L172 L324 C328 C329 C331 C330 C170 D341 L163 L162 L161 R151 C162 C161 C163

FUSE 3A

C152 Q151 L151 D142 D141 R152

R1252 C1251 C1254

D181 R1251 J1231 C181 L181 C1231 R1234 R1232 C202 C182 R563 R564 R565 R566 R567 R568 R569 R570 R571 R572 R573 R574 R575 R576 R577 R578 C183 L182 C203 C201 L201 C221 L221
D221 C241 L241 C261 L261 L262

D261 C281 L281

C301 L301 L302
R1211 R1212 C1211 R1213 C1212 R1214 R1215 C1214 C1213
L242 L243 L263 C263 C264 L264 C265 C266 C282
C262 L282 C283 C285 C284 C286 L283 C287

R1257 C1256

C223 C222 C225 C242 C243

C333 C322

R142 R141

C135 C134

C1217 IC551

C551 IC561

L223 C224 C226 C227 C228 C229

L303 C304 C303 C305 C306

C324 C325 C326

SPST MCK SPCE SPCH

R835 R834 R1023 C1023 R1022

R1205 R1201 R1202

R831 R832

C1271 R1271

MDAT BUSY 5V GND
C2036 R2032 C2042 R2031 C2035
from optional unit UT-102

R201 C209

L245 R241

L285 C290 R281

C121 C111 R111

C2031 C2034 C2033 C2032

R579 R580
R587 R588 R589 R590 R591 R592 R593

C1021 C1022

R301 C309

L345 C350

C268 C267

C171 C172 L173 C175 R171

R833 C831

C174 C176

C244 C245

IC1201

C1216 C1215

IC1211

C184 C185

C204 C205 C206 C207

(450 ) [ANT2] (GND)
1 JAFO ESPO ISPO to LOGIC board J501 AFE 5V 8V 14V 15 H5V JRFGV SML EMTI to LOGIC board J541 BEEP SQLS RXS SPST 15 CIV JPWRC DINT PSTB to LOGIC board J521 ASTB MCK PDAT PCOPSTJ1501 to PLL unit J2
R1084 C1090 C1089 R1082 C1101 C1102 R1108 R1110 R1111 R1109 R1107 R1103 R1104 R1105 R1106

R1006 C1007 C1006

Q383 C433 C432 C435

C382 R383 R382 C381 R381

R112 J111

C1362 C361

R361 L362

Q733 R738 C736 R740

R814 R813 R811 R825

J782 J781

PDAT PCO2 PST2 GND RECS 5V 8V 14V

C711 R712 R711

D881 R881 R883

C734 R781

J784 J783

IC1771

DSPS 2 DSTB ISTB MDAT DRES PCK PST1 PST3 16
R765 C762 J1541 R852 C851 R855 R851 D851

R763 R762

C1421 R493 R492 R491 C1753

R764 D764 D763

C761 R761

C735 R743 C732

Q736 R747

R735 R732

R741 R739 C737

R861 R862

R871 R872
AFGV 2 FMNL SALI RECS AGRS SBSY GND CIVE 16

J883 J884

R449 R448

R472 R476 C473

IC1601 C1601

IC1602

C476 R478 C475

R1415 R1411

R1412 R1413 C1416

C474 R477

R472 R474

R892 C893 R893

C891 R891

C1051 C461

R1311 R471 R473
AFO 2 ESPO ISPO AFE GND GND HVR BATT 16

R1002 R1007 C1002 Q1001 C1004 R1004 C1005 R1005

R1033 C1031

IC1101
L391 IC391 L371 C371 R372 R371

Q1031 C912 R1032 R1031

D392 D372

R413 R411

MP442 MP441

R2021 C2022 R897

C1392 L411 Q411 R414 C414 C443 R443 C425 C423 C422 R412 R442 C442 R444

C1381 C1382

C913 R912 Q911

C896 C911 R911

R914 Q912

IC1391

R1081 C1521

R395 R396

R2011 C2012 C2011 R2012 C2015 C2014
R386 C383 L383 D382 IC1361

C1361 C1363

IC2001

R392 C396 R394 C397 C394

Q381 C392 R391 D391 R362

R385 R384

IC1001

C411 C415

[MUTE]

Q1382 C1311

C1603 C1065

IC1411 C1417

[EXT SP]
C1067 R865 R875 D1061 R1066 R1062 R1063 Q1063

MP1411

C1062 R1061

R863 C861 C871 R873

IC1603

C1414 C1415 C1416 C1419

[REMOTE]

D1771 R1772 Q1772

Q735 R746 Q737 Q732 R750 R751

R819 C814

C731 R731
R1771 IC1751 Q1771 R1773 R1774

R784 C782 R785

R782 C781

R818 R821

R822 C813

R737 C733

R749 C742

C1755 C1756 L1771

[RS-232C]

R796 R775 C772

R794 C792

R816 R817 R802

R724 C723

R721 C721

C881 R882

R773 R771 C773

R723 C722
C701 C1402 C1401 IC1401 C1404 C1403
DRES PCK PST1 PST3 UNLC AAFO GND 14V

C725 C724

C801 R824

R722 R725

SECTION 9

OPTIONAL UNIT UT-106

CHASSIS UNIT
DRES DSPS MDAT MCK DSTB DINT Q472 XP4311 R14V REG Q911 RX TOTAL GAIN 2SK882 GR R898 Q912 RV-150 Q891 IC1101 2SC4081 R 3SK131 MAS MC1496D IF IF AMP AMP AGC AGC FI851 FL-65 CERAMIC BPF 3F3K FI861 CFWS450HT CERAMIC BPF 3F6K IF AMP Q1001 2SK882 GR FI871 CFWS450E CERAMIC BPF 3F15 BUFF Q1031 2SC4081 R D1061 1SS375 AGC DET Q1061 XP4311 Q1064 XP4311 Q1065 XP4311 Q1066 XP4311 DELAY CTRL Q1051 2SC4081 R D1051 1SS357 BUFF AGRS AGFS AGSS AGOS RFGV OPTIONAL XTAL BPF 3FOP 2FTH OPTIONAL XTAL BPF 2FOP Q801 2SC4081 R IC811 MC1496D BUFF FI761 FL-272 XTAL BPF 2F3K AGC Q721 3SK131 MAS IF AMP D711 MA77 D712 MA77 D713 MA77 D714 MA77 NB GATE FI701 FL-23 XTAL BPF BW=15kHz Q735 2SC4081 R Q736 DTC114EU Q737 XP4311 D732 1SS355 NBS NBLS UNLC D731 1SS375 NB DET Q733 2SC4081 R NOISE AMP GATE CTRL FI461 FL-261 IF AMP AGC Q471 3SK131 MAS R8V 14V Q441 2SK1740 Q442 2SK1740 LPF 60MHz POFF Q381 2SKQ382 2SKPRE AMP 2MHz LPF B1 2~4MHz BPF B2 PRE1 3dB ATT 14V PRE1 REG Q383 XP4311 IC391 UPC1658G PRE AMP 4~8MHz BPF B3 8~11MHz BPF B4 PRE2 14V 2S3K 2STH 2SOP 3S3K 3S6K 3S15 3SOP PRE2 REG Q391 XP4311 11~15MHz BPF B5 15~22MHz BPF B6 22~30MHz BPF B7 30~50MHz AFS1 AFS2 AFMS AGFS AGSS AGOS NBS NBLS 2S3K 2STH 2SOP 3S3K 3S6K 3S15 3SOP SAMS MCK MDAT ISTB SHIFT REGISTOR IC1602 BU4094BCFV F1351 FGB 3A DC IN 8V Q96 2SC4117 RIPPLE FILTER Q71 2SK508 Q72 DTC114EU D71 KV1470 Q81 2SK508 Q82 DTC114EU D81 KV1470 PWRC Q93 DTC114EU IC1391 TA7808F 8V +8 REG IC1401 TA7805F Q421 DTA144EU DRIVER PWRC IC1411 PC1555G2 D1412 1SS302 D1413 MA8051 M IC401A TC74HC04AF IC401B TC74HC04AF Q401 XP4601 D401 1SS355 DRIVER _5V _5 DC-DC IC201 SC-1287 (455kHz) CI-V IC1751 DS14C232TM IC1771 TC7W04F Q1771 2SA1576 R Q1772 2SC4081 R D1771 1SS355 DRIVER RS-232C Q3 DTC114EU D1 DAN222 UNLC AMP ULD DULS RECS LPF D/R DDS PCK PDAT PST2 DRES Q201 2SC4117 AMP PCK PDAT PST3 DRES Q1 2SC4405 X1 CR-275A PCK PDAT PST1 PCO2 CR-282 (OPTION) DRES Q4 DTC114EU D2 1SS355 RL1 AHY103 DRIVER REC REMOTE REC OUT BPCK 5V +5 REG (9.4665MHz) LPF D/R IC151 SC-1287 DDS Q151 2SC4117 AMP (60MHz) P/D Freq = 30MHz / R (R=7,8,9,10) VCOS VCO SW P/D DDS IC23 TC7S04F DIV (1/R) Q2 2SC4405 x2 AMP IC21 SC-1246/A LOF2 VCOS DULS ULD (30MHz) AMP IC22 UPB1509GV 1/4 Q91 2SC4405 LO AMP (69.0115~129.0115MHz) LOF2 BPF B8 50~60MHz BPF B9 PRE1 PRE2 POFF ATTC ANTC SW CTRL Q151 DTC114EU PROTECT D141 1SS302 D142 1SS302 1.6MHz HPF ATTC 10dB ATT B0 1.6MHz LPF RL141 MZ-12HG 20dB ATT ANTC 60MHz LPF RL121 MZ-12HG

PC2/AN10 PC1/AN9 PC0/AN8 PB7/AN7 PB6/AN6 PB5/AN5 PB4/AN4 PB3/AN3 PB2/AN2 PB1/AN1 PB0/AN0 AVCC P43/IRQ0 P42/TXD P41/RXD P40/SCK3 P17/IRQ3/TMIF P16/IRQ2/TMIC P15/IRQ1/TMIB P14/PWM P13/TMIG P12/TMOFH P11/TMOFL P10/TMOW VCC
C256 C255 C254 C253 C252 C251 0.1 0.1 0.1 0.1 0.1 0.1
PC3/AN11 AVSS TEST X2 X1 VSS OSC1 OSC2 RES MD0 P20/IRQ4/ADTRG P21/UD P22 P23 P24 P25 P26 P27 P30/SCK1 P31/SI1 P32/SO1 P33/SCK2 P34/SI2 P35/SO2 P36/STRB

IC101 HD6433837SC58H

P97/SEG40/CL1 P96/SEG39/CL2 P95/SEG38/D0 P94/SEG37/M P93/SEG36 P92/SEG35 P91/SEG34 P90/SEG33 P87/SEG32 P86/SEG31 P85/SEG30 P84/SEG29 P83/SEG28 P82/SEG27 P81/SEG26 P80/SEG25 P77/SEG24 P76/SEG23 P75/SEG22 P74/SEG21 P73/SEG20 P72/SEG19 P71/SEG18 P70/SEG17 P67/SEG16
CL1 CL2 DO M Rk Rk R195 1k Rk R193 1k Rk R191 1k PCO2 DSTB DINT DSPS SPST SBSY DRES

R197 1k

R179 1k R178 1k R177 1k R176 1k R175 1k R174 1k R173 1k R172 1k R171 1k Rk Rk Rk
SALI EMTI CLKK SETK LOCK DNK UPK SCAK SELK
Power on: 4.8 V Power off: 0 V

Q421 DTA144EU

PWRS Rk R421 470
Power on: 0 V Power off: 4.9 V
L121 HF50ACC322513-B RJ121 HLJ2307-01-3070 RC121 0.0047 C122 0.0047 C123 0.0047

J471 52808-1090

J101 52793-1090
R149 1k R148 1k R147 1k Rk R146 1k Rk R145 1k R144 1k R143 1k R142 1k Rk R141 1k
4.8 V Rk 0V Rk 4.9 V Rk Rk C392 0.22 R394 1k 5.2 V

C231 0.1 H5VL

CS SO WP VSS

VCC HOLD SCK SI

C102 0.1

COM1 COM2 COM3 COM4

V3 V2 V1
GND AFE AFE AFE ESPO ESPO ESPO AFO AFO AFO

R155 1k

IC231 X25320SI-2.7

R154 1k R152 1k R150 1k

R153 1k R151 1k
SP1 VS-50-0827 P1 PHR-2 AFE ISPO W1 W2 J501 52808-1

RC221 0.1

J491 B2B-PH-SM3-TB AFO AFO ESPO ESPO ISPO ISPO AFE AFE 5V GND 8V GND 14V HV H5V BATT
L491 HF50ACC322513-B AFE ISPO L492 HF50ACC322513-B
CLRK MWK VMK AGCK NBK ANFK NRK ATTK PREK TSK FILK FMK AMK CWK SSBK

W163 H5VL

Rk D401 1SS5

R402 6.8 k

C395 0.3 Rk Rk 2 3

Q401 XP460

INT SP

MAIN(1)

Q391 2SC4116 BL
H5VL 5VL 14V C503 0.1 EP501 L502 MMZ1608Y102BT 120 H 4.9 V C502 0.1 L503 HF50ACC322513-B EP502 L501 MMZ1608Y102BT 120 H HV B5V 13.8 V D382 MA729 Rk 4.8 V

D393 1SS355

IC391 S-80942ANMP-DD6
1 OUT 2 VDD 3 VSS CD 5 NC 4

IC392 TC7S08F

CP 5.2 V

Q511 2SA1576 R

3.0 V R511 2.2 M C505 0.1
D381 MA8051 M R514 6.8 k R381 1k Rk

R391 Ck 0.22

MAIN(2)
PWRC DSPS DINT DSTB RSTB ISTB ASTB MDAT MCK DRES PDAT PCK PCO2 PST1 PST2 PST3

J521 52808-1690

Power on: 4.8 V Power off: 3.0 V

Q512 XP4601

EP521 MMZ1608Y102BT EP522 MMZ1608Y102BT EP523 MMZ1608Y102BT EP524 MMZ1608Y102BT EP525 MMZ1608Y102BT EP526 MMZ1608Y102BT EP527 MMZ1608Y102BT

MAIN(3)

RFGV AFGV SML FMNL EMTI SALI BEEP RECS SQLS AGRS RXS SBSY SPST GND CIV CIVE

J541 52808-1690

COMPLETE VIEW

11 - 1

DCK/DUD (At turn the main dial to the clockwise) DCK 4.8 V Rk Rk Rk Rk Rk Rk Rk Rk Rk Rk Rk 2.4 V 0V 102 ns 4.3 V 1.5 V 0V 30.5 s 2.6 V J411 52808-1690 J101 52808-1690 IC101-8pin IC101-4pin 0V DUD 4.8 V 0V 0V 1 ms (2 ms) BPCK (At beep on) 4.8 V
COM0 4.8 V 3.2 V SE45 SE44 SE43 SE42 SE41 SE40 SE39 SE38 SE37 SE36 SE35 SE34 SE33 SE32 SE31 SE30 SE29 SE28 SE27 SE26 SE25 SE24 SE23 SE22 SE21 SE20 SE19 SE18 SE17 SE16 SE15 SE14 SE13 SE12 SE11 SE10 SE9 SE8 COM1 COM2 COM3 COM4 SE7 SE6 SE5 SE4 SE3 SE2 SEs H5VL Pals 14s CL1 4.8 V M 0V C101 0.ms DO CL2 CL1 CL2 4.8 V V2 V3 V1 0V 32 s NC NC NC NC VCC NC M NC DO DI CL2 SHL NC CL1 GND V4 V3 V2 V1 VEE Y80 Y79 Y78 Y77 Y76 Y75 Y74 Y73 Y72 Y71 Y70 Y69 Y68 Y67 Y66 Y65 Y64 Y63 Y62 Y61 Y60 Y59 Y58 Y57 Y56 Y55 Y54 Y53 Y52 Y80 SE45 SE44 SE43 SE42 SE41 SE40 SE39 SE38 SE37 SE36 SE35 SE34 SE33 SE32 SE31 SE30 SE29 SE28 SE27 SE26 SE25 SE24 SE23 SE22 SE21 SE20 SE19 SE18 SE17 SE1 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10 Y11 Y12 Y13 Y14 Y15 Y16 Y17 Y18 Y19 Y20 Y21 Y22 Y23 Y24 Y25 Y26 Y27 Y28 Y29 Y30 SEG45 SEG44 SEG43 SEG42 SEG41 SEG40 SEG39 SEG38 SEG37 SEG36 SEG35 SEG34 SEG33 SEG32 SEG31 SEG30 SEG29 SEG28 SEG27 SEG26 SEG25 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG9 SEG8 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 DS101 HLC7395-M 4.8 V DO(Variational follow the display) 4.8 V 0V 2 ms 1.3 V 2.8 V 4.8 V H5VL M DO CL2 CL1 V3 V2 V1 COM1 COM2 COM3 COM4 GND DIMV GND 14V 0V 1.6 V 1.1 V 0V

L471 LS-484B

R478 2.2 k RR479 47

4.8 V 16 STR. D CLK OE
PST3 PST2 PST1 PCO2 PCK PDAT DRES MCK MDAT ASTB ISTB RSTB DSTB DINT DSPS PWRC

J1541 52808-1690

C552 0.1 8

Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8

B8S B9S PR1S PR2S POFS ATTS ANTS
Rk C461 7P C462 2P C472 0.1 13.6 V

C476 0.0047

C474 0.0047

Q472 XP4311

14V 1 R491 270
AGC RRL491 LR-317 D491 HSB88WS L492 LR-317 2IF

QS 9 QS 10

C562 0.1 R579 R580 Rk 47 k 47 k

FRONT(2)

IC552 BU4094BCFV

IC562 TD62783AF

C492 68P 14V 8V 1 R8V 14V 8V 5V MCK MDAT RSTV R8V 14V 8V 5V MCK MDAT RSTV C137 2.2
CIVE CIV GND SPSY SBSY RXS AGRS SQLS RECS BEEP SALI EMTI FMNL SML AFGV RFGV

FRONT(3)

J1561 52808-1690

13.8 V C1351 0.01

F1351 FGB 3A D1351 DSA3A1 C1352 0.01 C13.8 V R1351 10

LH R 1

R 1 C1411 C1412 0.1 47

J491 TMP-J01X-V6

2LO 14V 8V H5V HVR 14V 8V 5V HVR

C1361 2.2

J411 TMP-J01X-V6

10 - 3

ESPO ISPO 7.2 V D372 MA77 PREAMP 1: 13.5 V 2IF 2.7 V L701 LS-452 FI701 FL-23 L711 LS-452 D711 R713 D713 MAMA77 L712 LS-452 C721 0.0047 C724 L721 CP 10 H 0.0047 2.7 V D761 MA77 FI761 FL-R761 2.2 k R2F3K R711 2.2 k R712 2.2 k 1 0V 9.4 V D392 MA77 RC401 0.1 PREAMP 2: 7.7 V C731 0.0047 C732 0.0047 LH 1.0 V Rk RR734 R22 k R737 Qk 2SA1576 R C733 0.0047 C734 R738 0.k 1.3 V 8V LH 7.7 V NBS AGC R8V 7.8 V C712 0.0047 D771 MA77 1.2 V 2 R764 2.2 k D763 MA77 2.5 V

Q721 3SK131 MAS

Q801 2SC4081 R

7.7V C811 0.0047

R825 NTCCM16083NH 681KC

R816 2.7 k R817 2.7 k

C841 D8 0.0047 MA 2.8 V R 1
PREAMP 1: 9.7 V D382 MA77 C701 2P D712 MA77 D714 MA77 Rk Rk R1.2 V

2.3 V C711 0.0047

D762 MA77

D764 MA77

R811 1.5 k

RC761 0.1 C762 0.1

Rk 2.3 V

1.9 V RR801 1k

LH C385 0.1

R721 4.7 k

C722 0.1

C723 R724 0.0047 150

C725 0.1

D773 MA77

IC731 LA1150N

1.8 V 8 C735 0.0047

2.8 V R741 4.7 k
7.6 V L732 LS-466 CP731 HK3-S-T C738 150P D731 1SS375 Rk

R7.6 V 2FTH

D772 MA77

R771 2.2 k R772 220

C801 0.1 R812 R813 R470 3.3 k R822 10

R815 3.3 k

+SI GAIN GAIN -SI BIAS +OUT NC
VEE NC -OUT NC -CI NC +CI

R821 3.3 k R820 1k

IC811 MC1496D

R818 2.7 k

D8 MA C818 0.1

R774 2.2 k Rk

D774 MA77

Q731 2SK882 GR

R732 4.7 k

IC1251 M5282FP
VCC VCAOUT CTL VCAIN NC VCC2 IN+ INOUT GND

IC1401 TA7805F

RCC1294 0.1

RC1293 10

Rk C1255 0.01
C1251 0.1 RC1254 2.2 DAFI AFE Rk W1241 W1242

P1241 PHR-4

C1372 0.1 C1373 0.1

R1371 4.7 k

C1402 0.1

C1403 0.1

C1404 10
CR1262 C1261 8.2 k 10 CCR1259 4.7 k

R1254 4.7 k C1256 0.1

J1221 B4B-PH-SM3-TB C1217 DAFO 0.AFE 4

C1216 0.1

IC1211A NJM2058M

3 Rk CP Rk C1213 0.0033

IC1211B NJM2058M
5 Rk C1212 0.0012 Rk Rk C1211 0.7

Y Y Y Y INH A B

11 C1215 0.1

C12 0.0

C1374 0.1

C1375 470

R1258 4.7 k AAFO 10.0 V C1258 10
0.5 V 0V 8V F1351 FGB 3A D1351 DSA3A1 C1352 0.01 C13.8 V C1411 C0.1 C1361 2.2 HVR RC1413 C0.1 C1362 0.1 C1363 0.1 C1415 0.001 C1416 0.01 RLH R11.0 V Rk Rk VCC DISCHARGE VTH VCONT GND TRG OUT RESET 3 4

Ds 1SS302

_5V R_5.3 V LH 5V 8V 14V CH5V

IC1411 PC1555G2

C1417 47

IC1361 AN78L05M

I G C1364 0.1 O

C1418 47

RD1413 C1419 C1420 MA8051 M 0.5.0 V

C1421 0.1

C14V 8V H5V 14V 8V 5V F1353 F1352 S-N5054 #01S-N5054

FUSE HOLDER

D763 MA77
C841 D851 0.0047 MA77 2.8 V Rk
FI851 FL-65 I O Rk RRC851 0.1 C852 R855 0.k

D852 MA77

L891 LS-450

R892 100

Q891 3SK131 MAS

C892 0.0047 1.5 V

7.5 V L892 LS-450

Q911 2SK882 GR

L911 LS-450
7.5 V 0V C897 0.0047 0.4 V Rk R912 2.2 k CP C911 R0.1

C913 0.1 R913 100

Rk 2.3 V 62 D773 MA77
1.9 V RR801 1k C801 0.1 R812 R813 R470 3.3 k RC813 0.1 R815 3.3 k
2.7 V C891 0.1 Rk Rk C893 0.0047 C894 0.1 R895 330

C914 2.2 R824 220

R893 2.2 k

CP C896 0.1

R897 100

AGC D862 MA77

Q912 2SC4081 R

Rk 72 L

C818 0.1

Rk RRC861 0.1

7.9 V 3F6K

R2.6 V C1002 0.0047

C1010 0.1

R1002 100

C862 R865 0.k D872 MA77

D871 MA77

FI871 FL-65 I O R874 3.9 k RRC871 0.1

Q1001 2SK882 GR

Rk CP CP
OSCIN OSCOUT MIXOUT VDD IFIN BIAS FILOUT FILIN
MIXIN VSS NOUT NDET SOUT IFOUT QUADIN AFOUT

C1008 10

X1001 CDB450C24 CP R1006 1.5 k 8V *4.8 V R1051 2.7 k R1052 4.7 k C1051 C0.0047 *3.0 V

*2.6 V RD1051 1SS375

7.1 V Rk
R795 4.7 k 3FR785 C792 Rk 0.1 2.2 k R796 2.2 k C831 0.0033 R831 4.7 M 0.6 V R833 4.7 M R836 4.7 k 10 R834 4.7 M R835 1.5 M 3F0P R832 4.7 M Rk