Marantz AV8003 AV Pre Tuner Service Manual
This service manual provides detailed technical information and procedures for the Marantz AV8003 AV Pre Tuner. It is intended for qualified service personnel.
Table of Contents
- 1. Technical Specifications
- 2. Technical Description
- 3. Service Mode
- 4. System Error
- 5. Dual Backup Memory
- 6. Update Firmware
- 7. Wiring Diagram
- 8. Block Diagram
- 9. Schematic Diagram
- 10. Parts Location
- 11. Exploded View and Parts List
- 12. Microprocessor and IC Data
- 13. Electrical Parts List
- 14. About Replace the Microprocessor with a New One
1. Technical Specifications
Specifications for the AV8003 vary slightly based on the model suffix (/F, /K, /N, /U).
| Section | Specification | Notes |
|---|---|---|
| FM Tuner Section | Frequency Range | 76.0 - 90.0 MHz [/F] 87.5 - 108.0 MHz [/K/N] 87.5 - 107.9 MHz [/U] |
| Usable Sensitivity | IHF 1.8 µV/16.4 dBf | |
| Signal to Noise Ratio | Mono/Stereo 75/70 dB | |
| Distortion | Mono/Stereo 0.2/0.3 % | |
| HD Radio Distortion | 0.02 % [/U] | |
| Stereo Separation | 1 kHz 45 dB | |
| HD Radio Stereo Separation | 1 kHz 85 dB [/U] | |
| Alternate Channel Selectivity | ±300 kHz 60 dB [/F/K/N] ±400 kHz 60 dB [/U] | |
| Image Rejection | 98 MHz 70 dB [/F/K/N] 98.1 MHz 70 dB [/U] | |
| Tuner Output Level | 1 kHz, ±75 kHz Dev 800 mV | |
| AM Tuner Section | Frequency Range | 531 - 1602 kHz [/F/K/N] 530 - 1710 kHz [/U] |
| Signal to Noise Ratio | 50 dB | |
| Usable Sensitivity | Loop 400 µV [/F/K/N] Loop 500 µV [/U] | |
| Distortion | 400Hz, 30 % Mod. 0.5 % | |
| Selectivity | ±20 kHz 70 dB | |
| HDMI Section | Version | 1.3a [INPUT] 1.3a [OUTPUT] |
| Audio Section | Input Sensitivity/Impedance (Unbalanced) | 200 mV/ 47 k ohms |
| Input Sensitivity/Impedance (Balanced) | 400 mV/ 30 k ohms | |
| Output Level/Impedance (Unbalanced) | 1 V/ 470 ohms | |
| Output Level/Impedance (Balanced) | 2 V/ 470 ohms | |
| Signal to Noise Ratio (Analog Input / Pure Direct) | 105 dB | |
| Frequency Response (Analog Input / Pure Direct) | 8 Hz - 100 kHz (± 3 dB) | |
| Frequency Response (Digital Input / 96 kHz PCM) | 8 Hz - 45 kHz (± 3 dB) | |
| Video Section | Television Format | NTSC/PAL |
| Input Level/Impedance | 1 Vp-p/75 ohms | |
| Output Level/Impedance | 1 Vp-p/75 ohms | |
| Video Frequency Response | 5 Hz to 8 MHz (-1 dB) | |
| Video Frequency (Component) | 5 Hz to 100 MHz (-3 dB) | |
| S/N | 60 dB | |
| General | Power Requirement | AC 100 V 50/60 Hz [/F] AC 220 V 50/60 Hz [/K] AC 230 V 50/60 Hz [/N] AC 120 V 60 Hz [/U] |
| Power Consumption | 85 W | |
| Standby Power Consumption | (Normal) 1.0 W (Economy) 0.7 W | |
| Weight | 11.6 kg | |
| Dimensions | (W x H x D) | 440 mm x 170.5 mm x 440 mm (approx. 17-5/16 ins. x 6-3/4 ins. x 17-5/16 ins.) |
| Accessories | Included items | Remote Controller (RC2001, RC101), Microphone, AAA Batteries (4x Alkaline, 2x Dry), FM Antenna (Feeder Antenna/Converter for /U), AM Loop Antenna (HD Radio for /U), AC Cable, USB Cable, User Guides (AV8003, Network, Wizz.it3). |
Specifications are subject to change without prior notice.
2. Technical Description
This section describes the technologies and features of the Marantz AV8003, including THX processing, Dolby and DTS formats, and other audio technologies.
THX Standards and Technologies
THX is a set of standards and technologies developed by Lucasfilm Ltd. to ensure faithful reproduction of movie soundtracks in home theater environments. Key THX technologies integrated into the unit include:
- Re-Equalization (Re-EQ): Compensates for the brighter tonal balance of movie theater sound mixing, preventing harshness in home environments.
- Timbre Matching: Filters surround speakers to match the tonal characteristics of front speakers for seamless sound panning.
- Adaptive Decorrelation (AD): Modifies the time and phase relationship between surround channels to create a spacious surround experience even with two surround speakers, mimicking multi-speaker theater systems.
The unit's THX certification required passing rigorous performance tests covering pre-amplifier and power amplifier operations, as well as numerous digital and analog parameters. THX modes benefit movies encoded in Dolby Digital, DTS, Dolby Pro Logic, stereo, and mono. THX processing is recommended for movie theater-produced content, not typically for music, TV movies, or sports.
THX Surround EX: A joint development with Dolby Laboratories, this technology adds a surround back channel for 6.1 channel reproduction, enhancing imaging, depth, and sound localization. It operates for Dolby Digital Surround EX encoded material and can also process 5.1 channel material when THX is active. The effectiveness of the surround back channel for non-EX encoded material depends on the soundtrack and listener preference.
THX Ultra2 Specification: Offers uncompromised 7.1 channel playback for movies and music across a wide listening area. It includes:
- Advanced Speaker Array (ASA): Processes sound for surround and surround back speakers to optimize the surround soundfield, especially when using all eight speaker outputs. The placement of surround back speakers affects the optimal setup.
- Boundary Gain Compensation (BGC): Addresses potential bass reinforcement issues caused by room boundaries (rear walls) that can lead to a 'boomy' sound. BGC can be selected in the THX Audio Setup menu to improve bass balance.
THX Ultra2 modes (Cinema, Music, Games) utilize ASA processing.
Neural-THX Surround
Neural-THX Surround is an official surround sound format for broadcast stations, delivering surround sound compatible with stereo. It uses psychoacoustic processing to enhance detail, channel separation, and audio element localization for both surround-encoded and stereo material.
This product is manufactured under license from Neural Audio Corporation and THX Ltd.
DTS Technologies
DTS Digital Surround: Introduced in 1994, it provides 5.1 channels of discrete digital audio for home theater systems, delivering an exact copy of studio master recordings.
DTS Neo:6: A high-quality matrix decoding technology for stereo matrix material, providing up to six full-band channels. It offers improved channel steering and a music mode for expanding stereo recordings into multichannel formats without diminishing original integrity.
DTS 96/24: Enables 5.1 channel sound encoded at 96kHz/24bits on DVD-Video titles, offering superior sound quality, backward compatibility, and no need for new players. It supports full-motion video with 96/24 5.1-channel sound.
DTS-ES (Extended Surround): Enhances the 360-degree surround impression and space expression with an additional surround back channel for 6.1 channel reproduction. It supports Discrete 6.1 and Matrix 6.1 formats.
DTS-HD Master Audio: Delivers bit-for-bit identical audio to the studio master, supporting high variable bit rates for 7.1 channels at 96kHz/24-bit resolution.
DTS-HD High Resolution Audio: Provides virtually indistinguishable audio from the original, delivering high constant bit rates for up to 7.1 channels at 96kHz/24-bit resolution.
Dolby Technologies
Dolby Digital: Provides up to five full-range channels (left, center, right, surround left/right) and a Low Frequency Effect (LFE) channel, used in formats like DVD and DTV.
Dolby Surround Pro Logic IIx: A matrix decoding technology that delivers a 7.1-channel listening experience from stereo or 5.1-channel sources. It is compatible with existing Dolby Surround Pro Logic material and enhances stereo music content.
Dolby Digital EX: Creates six full-bandwidth output channels from 5.1-channel sources using a matrix decoder to derive three surround channels from two. It is optimized for Dolby Digital Surround EX soundtracks.
Dolby Headphone: Provides a surround sound experience over headphones using patented perspective curves to create an immersive, non-fatiguing listening experience from multichannel or stereo material.
Dolby Virtual Speaker: Creates a virtual surround sound experience using only two front speakers, simulating surround speaker effects from multichannel Dolby Digital sources or Pro Logic/Pro Logic II signals.
Dolby TrueHD: Dolby's next-generation lossless technology for high-definition disc media, delivering bit-for-bit identical sound to the studio master.
Dolby Digital Plus: A versatile audio codec designed for future audio/video delivery systems while maintaining backward compatibility with existing Dolby Digital 5.1 systems.
Circle Surround II (CS-II)
CS-II is a multichannel technology enabling up to 6.1 channel surround sound playback from mono, stereo, CS encoded, and matrix encoded sources. It provides dialogue clarity (SRS Dialog) and bass enrichment (TruBass).
HDCD (High Definition Compatible Digital)
A patented process for delivering full richness and detail from original microphone feeds onto CDs, using 20 bits of musical information while remaining CD format compatible. It offers extended dynamic range, a focused 3D soundstage, and natural timbre.
HDMI
High-Definition Multimedia Interface for transmitting digital audio and video signals.
Audyssey MultEQ
A room correction technology that addresses acoustic issues caused by room reflections and standing waves. It measures loudspeaker interactions with the room at multiple locations to minimize acoustical effects and optimize sound for multiple listeners. MultEQ also automates speaker setup, identifying speaker types, setting crossovers, checking polarity, measuring distances for delay adjustments, and setting volume trims.
HD RadioTM Technology
Enables AM/FM stations to broadcast digitally, providing improved audio quality, reception, and data services. Allows for up to 8 HD Radio programs on a single FM channel.
XM Satellite Radio Ready
Indicates compatibility with XM Satellite Radio services, including XM HD Surround which uses Neural Surround technology.
Other Technologies
The manual also references DLNA CertifiedTM, x.v.Color, and various patents related to audio processing technologies.
3. Service Mode
The unit features a Service Mode for checking software versions and performing segment checks. Accessing this mode requires a specific button combination.
Entering Service Mode:
- Connect the mains cord.
- Turn on the unit using the POWER ON/OFF (STANDBY) button.
- Press and hold the PURE DIRECT, 7.1CH INPUT, and M-DAX buttons simultaneously for more than 3 seconds.
- The FL display will show “SERVICE MODE” for 2 seconds, then the model name.
Navigating Service Mode: Pressing the ENTER button cycles through the following information:
- MAIN CPU Software Version: Displays the version of the MAIN CPU (IC17). Example: V080509 1U.
- Serial Number: Displays the unit's serial number. Example: 294967295 MZ.
- TI DSP (IC34) B1 Code: Displays the DSP software version. Example: B1 10805081.
- TI DSP (IC34) B2 Code: Displays another DSP software version. Example: B2 20803131.
- HDMI CPU (IC81) Software Version: Displays the HDMI CPU software version. Example: HDMI Ver. h13.
- HD Radio (IC91) Software Version: Displays the HD Radio CPU software version (for /U1B models only). Example: HR V07111401.
- HD Radio Module Firmware Version: Displays the HD Radio module firmware version (for /U1B models only). Example: HDRM S_00BU_09.16 / DR1-352-0017 51EF-CMR-V01.
- DMP Sub CPU (IC51) Software Version: Displays the DMP Sub CPU software version. Example: DMP V08050701.
- DMP Module Software Version: Displays the DMP module software version. Example: DMPM 08021401.
- FLD Segment Checks: Subsequent ENTER presses activate FLD segment tests:
- Left half, right half, and center segments light up alternately.
- Segments in the character area flicker in a checker pattern.
- All FL segments turn off.
- Exiting Service Mode: Press ENTER again to exit Service Mode.
Product Reset: To reset backup memory to default settings (function selector, surround mode, delay time, tuner presets, etc.):
- Turn on the AV8003.
- Press and hold the ZONE and TOP buttons simultaneously for 3 seconds or more.
4. System Error
This section details potential system errors and their causes, along with troubleshooting steps.
Check 1: EEP-ROM (DSP PWB / IC15) Interface Error
Indicates a communication error with the EEP-ROM. The FL display shows “E2P IF ERROR”.
- Points to check:
- IIC Clock Line (IC17/116pin to IC15/6pin) continuity.
- IIC Data Line (IC17/117pin to IC15/5pin) continuity.
- VCC (+3.3V) supply to IC15/8pin.
- If the above are normal, IC15 may be defective.
Check 2: Power Supply Errors
Abnormality on -15V Supply (_P LINE FAIL):
- Detection: STANDBY LED flickers (500 msec interval).
- Reason: -15V supply failure. CPU (IC17) pin 135 shows 0V instead of -15V.
- Check points: Regulator PWB CN66/3pin connection to CPU PWB BN66/3pin. Regulator PWB components like D901, R903/R904, IC93/IC94 related to -15V supply.
+5VD Supply Error (_5V DOWN):
- Detection: STANDBY LED flickers (500 msec interval).
- Reason: +5VD supply failure. Main-CPU (IC17) pin 137 shows 0V instead of +5VD.
- Check points: Regulator PWB CN50/4,5pin connection to DSP PWB CN80/6,7pin and INPUT PWB BN80/6,7pin, BN50/4,5pin. Regulator PWB components like IC92, D902, F901 related to +5VD supply.
Recovery: The product can recover from these errors by cycling the standby power. If the error reoccurs, it will enter standby again.
Check 3: ON Timing and Muting
Ensures normal operation upon power-on. The timing chart shows the sequence of signals like _STANDBY, _P_DOWN, _P_LINE_FAIL, _5V_DOWN, MUTE, _PRE_MUTE, FRONT_OFF, and STANDBY LED. Abnormal detection leads to flickering STANDBY LED and potential muting.
- Normal Operation Timing: _STANDBY signal sequence, followed by power supply checks (_P_LINE_FAIL, +5VD), channel muting, and finally STANDBY LED activation.
- Abnormal Detection: If power supply errors (_P_LINE_FAIL or 5V_DOWN) are detected after the initial _STANDBY signal, the unit enters a safe state, potentially muting channels and causing the STANDBY LED to flicker.
Check 4: HD Radio Error Detection (/U1B only)
- “CPU <-> HDR” on FL DISPLAY: Main-CPU to HD Radio-CPU communication failure.
- Check points: 6V power supply, HD Radio-CPU communication module, CPU fail.
- “HDR <-> HDRM” on FL DISPLAY: Module to HD Radio-CPU communication failure.
- Check points: 5V power supply, HD Radio module, communication.
- No error message (RF tuner control fail): RF tuner front-end control failure.
- Check points: 3.3V power supply, 12V power supply, module fail.
- No sound or Noisy: Audio signal path or RF signal condition issues.
- Check points: Module performance, antenna condition, external interference.
5. Dual Backup Memory
The AV8003 features a Dual Backup Memory function that allows saving user-configured settings beyond the standard power-off memory.
- Standard Backup: Memorizes current settings when main power is turned off, restoring them upon power-on.
- Dual Backup Memory: Allows saving arbitrary settings configured during operation for later restoration. This is useful for service to retain user settings after repairs.
Note: If end-users use this function, their data will be overwritten.
How to Operate:
- Backup:
- Configure desired settings.
- Press and hold [MEMORY] and [ENTER] on the Front Panel for 3 seconds or more.
- FLD displays “MEMORY SAVING”, then “COMPLETE”.
- Recovery:
- Press and hold [MEMORY] and [ENTER] on the Front Panel for 3 seconds or more.
- FLD displays “MEMORY LOAD”, then “COMPLETE”. The product enters Standby mode.
“NO BACKUP” indication: Appears if Dual Backup Memory has not been activated or contains no saved data.
Limitations: This function does not back up Main Zone Volume, Multi Zone Volume, or Zone Speaker Volume levels.
Service Precautions: When replacing the DSP PWB Flash ROM (IC34) or rewriting DSP CODE for version upgrades, clear the DUAL BACKUP MEMORY to maintain consistency.
- How to clear Backup Memory:
- Press and hold [MENU] and [CLEAR] on the Front Panel for 3 seconds or more.
- FLD displays “BACKUP CLEAR”, then “COMPLETE”.
6. Update Firmware
Software for the MAIN CPU, DSP, HDMI CPU, HD Radio CPU, HD Radio Module, and DMP Sub CPU can be updated or downloaded. Specific update applications are required (e.g., FlashUpdate_v110.exe, da708_writer.exe).
Update Modes:
- Mode 1: Update/Download MAIN CPU Software: Targets internal Flash-ROM of CPU (IC17) on DSP PWB. Takes approx. 3 minutes. Requires setting the unit to writing condition via application software.
- Mode 2: Update/Download DSP Software: Targets Flash-ROM (IC34) on DSP PWB. Takes approx. 6 minutes 30 seconds. Requires setting the unit to loading mode via front buttons (ENTER, SURROUND MODE, T-MODE).
- Mode 3: Update/Download HDMI CPU Software: Targets internal Flash-ROM of CPU (IC81) on HDMI PWB. Takes approx. 2 minutes. Requires setting the unit to loading mode via front buttons (ENTER, SURROUND MODE, T-MODE).
- Mode 4: Update/Download HD Radio CPU Software (/U1B only): Targets internal Flash-ROM of CPU (IC91) on HD RADIO PWB. Takes approx. 20 seconds. Requires setting the unit to loading mode via front buttons.
- Mode 5: Update/Download HD Radio Module Software (/U1B only): Targets the HD Radio Module. Takes approx. 1 minute. Requires setting the unit to loading mode via front buttons.
- Mode 6: Update/Download DMP Sub CPU Software: Targets internal Flash-ROM of CPU (IC51) on STAND BY PWB. Takes approx. 20 seconds. Requires setting the unit to loading mode via front buttons.
Necessary Equipment:
- Windows PC (Windows 2000 or XP) with a Serial Port.
- RS-232C D-sub 9-pin cable (female to female, straight type).
- Specific update software for each component (e.g., FlashUpdate_v110.exe for MAIN CPU, da708_writer.exe for DSP).
Update Procedure (General Steps):
- Place the relevant software folder onto the PC's hard drive.
- Connect the PC's serial port to the unit's RS-232C port using the cable.
- Connect the mains cord and turn on the unit.
- Launch the appropriate update application software.
- Select the COM port, speed, and the ROM/firmware file (.rom, .upd, .hex, .mot).
- Follow on-screen prompts to initiate the update process. The FLD will display status messages like “UPDATE MODE”, “CONNECTING”, or progress percentages.
- Upon successful completion, a confirmation dialog will appear.
- Turn off the unit and disconnect cables.
Detailed steps for each mode are provided in the original PDF, including specific button presses and software interactions.
7. Wiring Diagram
The wiring diagram illustrates the physical interconnections between various Printed Circuit Boards (PCBs) and modules within the AV8003. It shows how components like the MAIN TRANS, DMP PWB, COMPONENT PWB, STANDBY PWB, REGULATOR PWB, VIDEO PWB, HDMI PWB, DSP PWB, INPUT PWB, FRONT PWB, and others are connected via various cables and connectors (e.g., FFC, 2.0mm, 2.5mm, 7.92mm pitch connectors). It also indicates optional boards like RC232, SIRIUS, and XM PWB for specific regional versions.
8. Block Diagram
The block diagram provides a high-level overview of the AV8003's internal architecture and signal flow. It depicts the main functional blocks and their interconnections:
- Input Section: Receives signals from various sources including TUNER MODULE (FM/HD Radio), XM PART, 7.1CH IN, DMP (AUX1), TV, DVD, VCR1, VCR2, CD/CDR, TAPE, and AUX2.
- Tuner/HD Radio/XM: Dedicated modules for receiving FM, HD Radio, and XM Satellite Radio signals, controlled by respective microcontrollers and interfaces.
- Input & Volume Part: Manages input selection (FUNCTION SEL TC94A46), volume control (MASTER VR TC9274), and headphone output.
- Audio Processing: Includes Analog-to-Digital (A/D) converters (CS5361), Digital-to-Analog (D/A) converters (CS4392, CS4382A), and digital interface receivers (LC89057W).
- DSP Part: The core audio processing unit, featuring a DSP (DA788B), Flash ROM, SDRAM, and interfaces for digital audio signals.
- HDMI Part: Handles HDMI input and output signals via HDMI receivers (Sil9185CTU, Sil9134CTU) and transmitters, including video scaling and processing (ADV7403, ADV7320, ABT1010).
- Video Part: Manages composite and component video signals, including conversion, scaling, and OSD (On-Screen Display) generation.
- Output Section: Pre-amplifier outputs (PRE OUT-T, PRE OUT-B) for front L/R, surround L/R, surround back L/R, center, and subwoofer channels. Also includes speaker outputs.
- Power Supply Section: Details various voltage regulators (+3.3V, +5V, +12V, ±15V) derived from the main and standby transformers.
- Front Panel Interface: Connects front panel controls, display (FLD), and remote receiver to the main system.
- Microprocessor Control: A central microprocessor (M3087BFK) coordinates operations, manages interfaces, and controls various functions.
9. Schematic Diagram
The schematic diagrams provide detailed circuit layouts for various sections of the AV8003. These include:
- Video PWB: Details video input/output processing for composite (CVBS) and S-Video signals, including video amplifiers (NJM2595), switches, and OSD generation circuits (LC74781). It also shows component video input handling and signal routing.
- Component PWB: Illustrates the circuitry for handling component video inputs (Y, Pb, Pr) and outputs, featuring video amplifiers (NJM2584, NJM2586L) and signal switching.
- HDMI PWB: Depicts the complex circuitry for HDMI signal reception and transmission, including HDMI receivers (Sil9185CTU, Sil9134CTU), serializers/deserializers, buffer ICs, and connectors. It details the high-speed data paths and control signals required for HDMI communication.
- DSP PWB: Shows the core audio processing components, including the DSP chip (DA788B), memory (Flash ROM, SDRAM), digital interface receivers/transmitters, audio DACs (CS4382A), and interfaces for various digital audio formats.
- Input PWB: Details the analog input stages, including buffer amplifiers (NJM2068MDTE1) for various audio channels (e.g., 7.1CH inputs, AUX, XM, Tuner, Tape, CD/CDR) and volume control circuits.
- Power Supply Section: Schematics for various voltage regulators (e.g., LM1117S, KIA7808AF, RPM6936) that generate the necessary DC voltages from the main power supply.
- Front Panel Interface: Schematics for connecting front panel buttons, rotary encoders, LEDs, and the FL display driver (NJU3430).
- Microprocessor and Debug Connections: Details the connections for the main microprocessor and debugging interfaces (JTAG).
These schematics are highly detailed and require specific electronic knowledge to interpret. They show component-level connections and signal paths.
10. Parts Location
This section provides diagrams indicating the physical location of components on various Printed Circuit Boards (PCBs). These diagrams are essential for identifying and accessing specific parts during repair or replacement.
11. Exploded View and Parts List
The exploded view illustrates the physical assembly of the AV8003, showing how different parts fit together. The accompanying parts list provides detailed information, including part numbers, descriptions, and quantities for each component, enabling accurate ordering of replacement parts.
12. Microprocessor and IC Data
This section likely contains datasheets or key specifications for the microprocessors and Integrated Circuits (ICs) used in the AV8003, such as the MAIN CPU (IC17), DSP (IC34), HDMI CPU (IC81), HD Radio CPU (IC91), and DMP Sub CPU (IC51). This information is crucial for understanding their functionality and interfacing.
13. Electrical Parts List
A comprehensive list of all electrical components used in the AV8003, including resistors, capacitors, transistors, diodes, ICs, connectors, and other electronic parts. Each entry typically includes the part number, description, quantity, and sometimes the reference designator on the schematic.
14. About Replace the Microprocessor with a New One
This section provides specific instructions and precautions related to replacing the main microprocessor. It would typically cover procedures like data backup, programming the new microprocessor, and ensuring correct installation to maintain unit functionality.
