Sansui RZ-5000 Computerized Stereo Receiver

CAUTION

Safety Precautions:

Parts marked with the ? symbol on the schematic diagram and parts list are critical for safety. Use only manufacturer-recommended replacement parts with identical characteristics.
Before returning the unit to the customer, verify that exposed parts are acceptably insulated from the supply circuit by performing leakage-current or resistance measurements.

Specifications

Audio Section

Power Output: Min. 60 watts per channel (RMS), both channels driven, 20 Hz - 20,000 Hz, THD ≤ 0.05% into 8 ohms.
Total Harmonic Distortion: ≤ 0.05% at or below rated min. RMS power output (4-16 ohms).
Load Impedance: 4-16 ohms.
Input Sensitivity & Impedance (1 kHz):
- PHONO: 2.5 mV / 47 kohms
- CD, TAPE PLAY, VCR-1, 2/VDP: 200 mV / 47 kohms
- VIDEO INPUT Sensitivity/Impedance:
  - VCR-1, 2/VDP: 1.0 Vp-p / 75 ohms
VIDEO OUTPUT Level/Impedance: MONITOR OUT: 1.0 Vp-p / 75 ohms.
Frequency Response (at 1 watt): 10 Hz - 70,000 Hz, +1 dB, -3 dB.
Signal to Noise Ratio (short-circuit, A-network):
- PHONO: 73 dB
- CD, TAPE PLAY, VCR-1, 2/VDP: 90 dB
Controls:
- BASS: ±8 dB at 50 Hz
- TREBLE: ±7 dB at 10 kHz
- LOUDNESS (BASS BOOST OFF): +8 dB at 50 Hz
- LOUDNESS (BASS BOOST ON, VOLUME: -30 dB position): +10 dB at 100 Hz, +5 dB at 10 kHz

FM Section

Tuning Range: 88 to 108 MHz.
Usable Sensitivity (Mono IHF): 11.2 dBf (2.0 μV: T-100).
50 dB Quieting Sensitivity (Stereo): 38.2 dBf.
Signal to Noise Ratio (at 65 dBf, Stereo): 70 dB.
Distortion (at 65 dBf, Stereo): ≤ 0.3% at 1,000 Hz.
Stereo Separation: ≥ 40 dB at 1,000 Hz.

AM Section

Tuning Range: 530 to 1,600 kHz.
Usable Sensitivity (Loop antenna): 55 dB/m (562 µV/m).
Signal to Noise Ratio: 40 dB.

Others

Power Requirements: 120/220/240V, 50/60 Hz.
Power Consumption: 360 watts / 440 VA (Rated).
Dimensions: 430 mm (W) x 125 mm (H) x 335 mm (D) (16-15/16" x 4-15/16" x 13-1/4").
Weight: 9.5 kg (21.0 lbs) net / 11.3 kg (25 lbs) packed.
Remote controller: RS-1080 (Infra-red ray pulse system, DC 3V).

Block Diagram Description

The block diagram illustrates the internal architecture of the RZ-5000. Key functional blocks include:

FM Front-end & Tuner: Receives and processes FM signals, including local frequency generation and IF stages.
AM Tuner: Handles AM signal reception and tuning.
PLL Synthesizer (LC7218): Manages frequency synthesis for tuning across FM and AM bands, controlled by the main processor.
EQ Amp: Provides equalization for audio signals.
Input Selector: Routes various audio and video sources (PHONO, CD, TAPE, VCR) to the appropriate processing stages.
Processor (TMP47C870N): The central control unit, managing tuning, display, input selection, muting, and communication with the remote receiver.
MPX (Multiplex): Processes stereo FM signals.
Tone Control: Adjusts Bass and Treble frequencies.
Volume Control: Manages audio output level, including loudness compensation.
Power Amplifier: Amplifies the processed audio signals for output to speakers.
Protector Circuit: Protects the amplifier and speakers from faults.
Remote Receiver: Receives commands from the RS-1080 remote control.
Display & Operation Controls: Front panel interface for user interaction.

Adjustment Procedures

The service manual details several critical adjustment procedures to ensure optimal performance:

Bias Adjustment (Power Amp): Adjusts bias current for the left (L-CH) and right (R-CH) channels of the power amplifier, typically set between 7-17mV. This is crucial for amplifier stability and sound quality.
FM Adjustment:
- Reference Frequency Adjustment: Calibrates the FM tuner's reference frequency, ensuring accurate tuning.
- Discriminator Coil Adjustment: Optimizes the FM detector circuit for minimal distortion (THD).
- FM STEREO Adjustment:
  - Separation Adjustment: Maximizes stereo separation for a wider soundstage.
  - Muting Level Adjustment: Sets the threshold for the FM muting function, which silences weak or noisy signals.
AM Adjustment:
- IF Coil Adjustment: Tunes the Intermediate Frequency (IF) coils for optimal AM reception.
- Tuning Adjustment: Calibrates the AM tuner's frequency response across its range (e.g., 531kHz, 1602kHz).
- RF Adjustment: Fine-tunes the RF stages for AM reception.
- Signal Indicator Level Adjustment: Ensures the signal strength indicator functions correctly.

Note: Specific test equipment (SG, VTVM, Scope, Dist Meter) and test points are detailed for each adjustment.

Parts Lists and Board Information

The manual includes comprehensive parts lists and component location diagrams for various internal boards:

Packing List: Details items included in the product packaging.
Accessory List: Lists included accessories such as the remote controller, batteries, and antennas.
Abbreviations: Defines common abbreviations used for electronic components (e.g., C.R. for Carbon Resistor, E.C. for Electrolytic Capacitor).
Board-Specific Parts Lists: Detailed lists of components (resistors, capacitors, transistors, ICs, diodes, etc.) for specific boards, including:

F-6007 Power Amp. Board
F-6012 Volume Indicator Board
F-6010 Volume Control Board
F-6011 Balance, Treble, and Bass Volume Board
F-6014 Power Supply and Input Selector Board
F-6015 Display and Operation Switch Board
F-6016 Phones Jack and Speakers Switch Board
F-6018 Video In/Out Terminal Board
F-6068 Protector Board
F-6017 Tuner/Audio System Controller Board

Parts Location Diagrams: Visual guides showing the physical placement of components on each board, essential for servicing.

Terminal Functions and IC Block Diagrams

Detailed information is provided for the main integrated circuits (ICs) and their terminal functions:

TMP47C870N (Tuner/Audio System Controller):
- Description: This IC manages system control, including display output, key matrix input, analog signal indication, muting, volume control, and communication with the remote controller.
- Key Terminals: POWER (on/off control), MUTE (muting signal), VR UP/DN (volume control), VR LED (volume indicator), COMPU SELECTOR (input selection), RF (remote control input), ST (stereo indicator input), FL DUTY1/2 (display brightness).
LC7218 (PLL Synthesizer):
- Description: This IC is responsible for frequency synthesis, working with an external oscillator to tune FM and AM bands. It interfaces with the TMP47C870N via serial communication.
- Key Terminals: XIN/XOUT (oscillator connection), SI/SO/CK (serial interface), FMIF/AMIF (IF signal input), AMOSC/FM OSC (local oscillator input), FM/AM (band switching).
LC4066BH/TC4066BP (Analog Switch):
- Description: This is a quad bilateral analog switch used for signal routing and control within the audio system.

The manual also includes detailed diagrams of the internal block structure for these key ICs, illustrating their operational logic and signal paths.

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