Marantz MAR775, MAR770, DR-6000 service manual Pin function description, Pin Name, Vcc

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Pin function description

Pin

1

2

3

4

5

6

7

8

9

10

11

12

Name

VCC

VC

Output

Gnd

Foldback Input

Overvoltage

Protection

Current Sense Input

Demagnetisation Detection

Synchronisation Input

CT

Soft- Start/Dmax/Volta ge-Mode

RP Standby

Description

This pin is the positive supply of the IC. The operating voltage range after start-up is 9.0 to 14.5 V.

The output high state (VOH) is set by the voltage applied to this pin.

Peak currents up to 750 mA can be sourced or sunk, suitable for driving either MOSFET or bipolar transistors.

The groundpin is a single return, typically connected back to the power source.

The foldback function provides overload protection.

When the overvoltage protection pin receives a voltage greater than 2.5V, the device is disabled and requires a complete restart sequence.

A voltage proportional to the current flowing into the power switch is connected to this input.

A voltage delivered by an auxiliary transformer winding provides to the demagnetisation pin an indication of the magnetisation state of the flyback transformer. A zero voltage detection corresponds to complete core saturation.

The synchronisation input pin can be activated with either a negative pulse going from a level between 0.7V and 3.7V to Gnd or a positive pulse going from a level between 0.7V and 3.7V up to a level higher than 3.7V. The oscillator runs free when Pin 9 is connected to Gnd.

The normal mode oscillator frequency is programmed by the capacitor CT choice together with the Rref resistance value. CT, connected between Pin 10 and Gnd, generates the oscillator sawtooth.

A capacitor, resistor or a voltage source connected to this pin limits the switching duty-cycle. This pin can be used as a voltage mode control input. By connecting Pin 11 to Ground, the MC44603 can be shut down.

A voltage level applied to the RP Standby pin determines the output power level at which the oscillator will turn into the reduced frequency mode of operation (i.e. standby mode). An internal hysteresis comparator allows to return in the normal mode at a higher output power level.

13

14

15

16

E/A Out

Voltage Feedback

RF Standby

Rref

The error amplifier output is made available for loop compensation.

This is the inverting input of the Error Amplifier. It can be connected to the switching power supply output through an optical (or other) feedback loop.

The reduced frequency or standby frequency programming is made by the RF Standby resistance choice.

Rref sets the internal reference current. The internal reference current ranges from 100 A to 500 A. This requires that 5.0kW £ Rref £ 25kW .

CL 96532076_031.eps 290799

Figure 8-12

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Contents Service Manual Americas USAEurope / Trading BrazilPlayback & Recording and Disc This PCB contains the headphone socket CDR loader CDR main module CDL4009 or MAR770General Technical SpecificationsIII ESDService Hints Service Tools Status of player Dealer modeDealer diagnostics Software versions, test for defective components Electrical service diagnosticsMechanical service diagnostics Erasement of complete CD-RW DC-erase service modeCDR-Module Faultfinding treesCD-DA Disc Loaded CD R CD RW Wiring Power Supply Voltages Electrical Service DiagnosticsCD-RW Disc Loaded Display noOPEN/CLOSE Check Flex Connection from CDR Main Board Power Supply+3V3 AT IC7000 Pins 5,17,21,57, Check Safety Resistors CD ModuleCD Module Playback Display controller TMP87C874F Display BoardDescription of display board General descriptionSupply voltages Clock signalControl signals Test instructionsPush button operation IR receiver remote controlEasy jog knob Rotary operationFTD Drive Lines Display board troubleshooting guideClock Signal Control SignalsPin connections Power Supply Unit P816Description of P816 Description of controller MC44603VCC Pin function descriptionPin Name Regulation of P816 Block diagram of MC44603Operating description of MC44603 Start up sequence of P816Ch1 Drain voltage Ch2 Drain current Ch3 Gate voltage Circuit description of P816 CD Main Board Troubleshooting P816Measurements Block DiagramDescription Pin Configuration Hallu Hallv Hallw Input conditions conn 1006 pin Outputs connUcoil Vcoil Wcoil Test points on driverHF Path DC SettingsHfdet Setting Transfer CharacteristicsIIS CLK11 Nmute DAC Amplifier Pink Wiring DiagramW801at conn.1500 WY01at conn.F934of WY02 WY03 WY04 CDR main board10 D5V WC01at conn.1209 WC02at conn.1400 12V CDCDR Main Board Block DiagramPY46 Schematic Diagram and Parts LocationQ810 Q801 Q891 Q871 Q825 Q861 Q862 Q851 Q892 Switching Power Supply PCB. P816QY01 QY02 QY04 QN54 QN53 QN58 QN57 Q311 Q681 QF52 QF51 QN52 QN51 QG56 QN55Exploded View and Parts List Not Standard Spear Parts PackingElectroly CAP Electrical Parts ListCeramic CAP P816-MISCELLANEOUS P816-POWER Circuit Board P816-CAPACITORSP816-RESISTORS P816-SEMICONDUCTORSPP16-MISCELLANEOUS PP16-REAR Panel Circuit Board PP16-CAPACITORSPP16-RESISTOR PP16-SEMICONDUCTORSPY36-ROTARY Encoder Circuit Board
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MAR770, MAR775, DR-6000 specifications

The Marantz DR-6050 and DR-6000 are revered components in the world of high-fidelity audio systems, reflecting the brand's long-standing commitment to quality and performance. These models have gained popularity among audiophiles for their comprehensive features and advanced technologies, which cater to both casual listeners and serious music enthusiasts.

The Marantz DR-6050 is a CD recorder and player that stands out with its dual functionality. It allows users to enjoy CDs while also having the capability to record directly from various sources, including analog inputs and digital connections. This functionality is essential for those who wish to preserve their vinyl records, cassettes, or other audio formats onto CD. The machine supports CD-R and CD-RW media, providing flexibility for repeated use and recording.

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On the other hand, the Marantz DR-6000 offers similar capabilities but with an emphasis on simplicity and ease of use. Designed for users who appreciate an intuitive interface, it features straightforward controls and an ergonomic design. The DR-6000 supports multiple recording formats, including standard audio CDs, making it versatile for various playback systems.

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The Marantz DR-6050 and DR-6000 are ultimate companions for those who appreciate high-quality sound and need versatile recording solutions. With their blend of advanced technologies, clear audio output, and user-friendly designs, they remain solid choices for anyone looking to enhance their audio collection and experience.
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