Service Manual
Model TR-9000 PS-20 BO-9
Block Diagram
The block diagram illustrates the overall system architecture, showing the interconnections between various units such as the receiver (RX), transmitter (TX), Phase-Locked Loop (PLL), control unit, and power supply.
Circuit Description
RX Section
The RX section features a dual-gate MOS FET front end and a helical resonator for high sensitivity and excellent 2-signal characteristics. It includes a 2-stage Monolithic Crystal Filter (MCF), SSB and FM circuits, a Noise Blanker (NB) circuit, and an Automatic Gain Control (AGC) circuit. The FM signal is processed through a ceramic filter and IF amplifier, with an auto scan stop signal fed to the micro-computer. The detected audio frequency (AF) signal is amplified and power-amplified to drive the speaker.
Table 1. HA1366W (RX Unit : Q26) Specifications:
| Item | Symbol | Condition (Ta=25°C) | Rating MIN | Rating TYP | Rating MAX | Unit |
| DC current with no input | IQ | Vin=0 | - | 30.0 | 60.0 | mA |
| Gain in voltage | Gv | Vin=-50 dB | 50.0 | 52.5 | 55.0 | dB |
| Output power | Po | THD = 10% | 4.5 | 5.5 | - | W |
| Distortion | THD | Po=0.5 W | - | - | 1.5 | % |
| Noise level | WBN | Rg=10 kΩ, 6W=20 Hz ~ 20 kHz | - | - | 2.0 | mV |
| Hum ratio | HR | f=500 Hz | 28.0 | - | - | dB |
| Voltage allowance with a shorted load | f=500 Hz, Vin=10 mV, t=5 sec. | 16.0 | - | - | V |
Table 1.1 Gain (Gv) vs. Rack Position:
| Rack | 1 | 2 | 3 |
| Gv (dB) | 50.0 ~ 52.2 | 51.4 ~ 53.6 | 52.8 ~ 55.0 |
Table 2. Ceramic filter (L72-0316-05) CFW455E (RX Unit : CF1) Specifications:
| Item | Rating |
| Nominal center frequency | 455 kHz |
| 6 dB bandwidth | ±7.5 kHz or more |
| 50 dB bandwidth | ±15 kHz or less |
| Ripple (within 455 ±5 kHz) | 3 dB or less |
| Loss | 6 dB or less |
| Guaranteed attenuation (within 455 ±100 kHz) | 35 dB or more |
| Input and output impedance | 1.5 kΩ |
Table 3. Crystal filter (L71-0215-05) 10H2.2tD (RX Unit : XF2) Specifications:
| Item | Rating |
| Nominal center frequency (fo) | 10.695 MHz |
| Center frequency | Within fo ±200 Hz at 6 dB |
| Pass bandwidth | 2.2 kHz or less at 6 dB |
| Attenuation bandwidth | ±1.5 kHz or less at 20 dB ±2.4 kHz or less at 60 dB |
| Ripple | Less than 2 dB |
| Loss | Less than 5 dB |
| Guaranteed attenuation | 60 dB or more within ±40 kHz |
| Input and output impedance | 600 Ω ±10% / 15 pF ±10% |
Table 4. MCF (L71-0216-05) (RX Unit : XF1) Specifications:
| Item | Rating |
| Nominal center frequency (fo) | 10.695 MHz |
| Pass bandwidth | ±7.5 kHz or more at 3 dB |
| Attenuation bandwidth | ±25 kHz or less at 40 dB ±45 kHz or less at 60 dB |
| Guaranteed attenuation | 1. 70 dB or more within ± MHz 2. Spurious level = 40 dB or more at fo ~ fo +500 kHz 3. Spurious level = 80 dB or more at fo ~ (810 kHz ±10 Hal) |
| Ripple Loss |
1.0 dB or less 1.5 dB or less |
| Impedance | 3 kΩ / 0 pF |
TX Section
The TX section amplifies the microphone signal for SSB and FM transmission. The SSB signal is processed through a balanced modulator and a transmit/receive crystal filter. The FM signal is limiter-amplified and directly modulated. A 4-stage Band Pass Filter (BPF) eliminates spurious signals. An Automatic Level Control (ALC) circuit maintains stable output. The HI/LOW selection and protection in FM and CW modes are managed by changing the source voltage of the predriver. In CW mode, a keying circuit controls the transmit balanced mixer and predriver base. The final output is power-amplified by a power module (M57713) and filtered by a Low Pass Filter (LPF) before being sent to the antenna.
Table 5. Power module (V30-1131-06) M57713 MAX Rating (Final Unit : Q5) Specifications:
| Item | Symbol | Tc (°C) | Rating |
| Operating voltage | Vcc | 25 | 17 V |
| DC current | Icc | 25 | 6 A |
| Operating case temperature | Tc (op) | - | -30 ~ +110°C |
| Storage temperature | Tstg | - | -40 ~ +110°C |
| Base bias voltage | Vss | 25 | 10 V |
PLL Unit (X50-1620-11) Circuit Description
The PLL unit utilizes a Voltage Controlled Oscillator (VCO) and a frequency divider to achieve precise frequency control. The VCO signal is buffered, mixed with a Heterodyne (HET) signal, and then frequency-divided based on BCD data from the control unit to generate a 10 kHz comparison signal. A 10.24 MHz signal from the RX unit is also frequency-divided to produce a 10 kHz reference signal. These signals are phase-compared, filtered, and the resulting control voltage is applied to the VCO's tuning diode. A separate crystal oscillator generates the 14.2 MHz VCO HET signal, which is multiplied to produce a 127.8 MHz signal. Two vari-cap diodes in the crystal oscillator circuit control frequency, with one responding to DC voltage from the control unit for frequency adjustment and the other for Receive Incremental Tuning (RIT) and mode-specific frequency shifts.
Control Unit (X53-1160-11) Circuit Description
The control unit employs a micro-computer for efficient operation with minimal peripheral circuits. It features a dynamic scanning 5-digit LED display, with BCD data converted to 7-segment data by a decoder driver. The micro-computer outputs PLL data (MHz, 100 kHz, 10 kHz) directly, and also provides data for 1 kHz and 100 Hz orders via a dual latch and D/A converter. A voltage-detecting reset circuit ensures proper initialization. An encoder detects dial rotation for UP/DOWN frequency changes. A tone oscillator circuit activates a piezo-electric buzzer. Various switches control the micro-computer's output pulses. The scan circuit operates when the SCAN switch is pressed, stopping via the HOLD switch or transmit signal. Squelch stop signals can halt the scan temporarily. The control power circuit utilizes a 5V supply for the indicator and a 6V regulated supply for the micro-computer. A backup circuit allows the micro-computer to operate from a backup power source when the main power is off, minimizing power consumption.
PC Board Views and Component Descriptions
The manual includes detailed views of various Printed Circuit (PC) boards, including the Switch Unit, Final Unit, PLL Unit, Control Unit, RX Unit, and TX Unit. These views identify component placements and connections. Additionally, it provides diagrams and descriptions for various transistors, diodes, and other electronic components used in the system, along with their pin configurations and typical applications.
Parts Lists
Extensive parts lists are provided for each major unit (Switch Unit, Final Unit, PLL Unit, Control Unit, RX Unit, TX Unit, CAR Unit, PS-20 Power Supply, and BO-9 System Base). These lists detail component references, part numbers, descriptions, and remarks, facilitating maintenance and repair.
Disassembly and Reassembly Instructions
The manual includes step-by-step instructions and diagrams for disassembling and reassembling the unit, covering the case, front panel, sub panel, heat sink, PLL unit, and other components. These procedures are crucial for accessing internal parts for inspection or replacement.
Adjustments and Test Procedures
Detailed procedures are outlined for adjusting various sections of the transceiver, including the PLL, HET frequency, RIT, CAR, RX sensitivity, and TX power and deviation. These adjustments require specific test equipment such as RF VTVM, frequency counters, power meters, and signal generators. The manual specifies test conditions, measurement methods, adjustment points (trimmers and coils), and target specifications for each adjustment. It also includes operational checks for the micro-computer functions, such as VFO operation, dial steps, search, scan, and UP/DOWN controls.
Reference Data and Level Diagrams
Reference data, including a table of Japanese "SG" values, and level diagrams for the transmitter section are provided. These help in understanding signal levels and performance characteristics at various points within the circuitry.
PS-20 Power Supply Specifications
The PS-20 power supply specifications include input voltage ranges (AC 120/220/240V), output voltage (DC 13.8V), output current ratings (continuous and intermittent), voltage fluctuation limits, ripple voltage, and power consumption. Dimensions and weight are also provided.
BO-9 System Base Specifications
The BO-9 System Base specifications cover input voltage (AC120V or 220-240V), buck-up output (DC13.8V, 1.5 mA), AC outlet output (AC120V, 200W MAX), dimensions, and weight.
