Marantz MAR770, DR-6000, MAR775 service manual CD Main Board, Troubleshooting P816

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8.2.2Troubleshooting P816

Check fuse F820 and replace if necessary

OK

 

Check DC voltages

OK

+5V, +12V, -8V, VFTD (-35V),VDC1-VDC2 (3V8)

NOK

Disconnect power supply unit from CDR main board

Connect dummy load resistors 10W, 15 ohm at +5V, +12V and ground

 

Check DC voltages

 

OK

+5V, +12V, -8V, VFTD, VDC1-VDC2

 

 

 

These voltages might be somewhat higher than specified

 

 

 

 

 

 

 

 

 

 

 

OK

 

 

 

 

 

 

 

Check the +5V and +12V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOK

 

 

 

 

 

 

 

 

 

 

 

 

 

OK

Connect the mains inlet to a mains

isolated variac

Power supply unit OK

Power supply is OK

Check : - CDR main board

-Display assy

-CD main board for DR6050

Check the path of the other faulty voltage(s)

+5V : check D856, C857, L856, C859

+12V : check D866, C867, L867, R866, D868, C869

Turn input voltage up and check voltage across C821, this voltage should be ±1.41 x Vin AC

OK

Is power supply ticking?

NO

NOK

YES

Check the functionality of the following components :

F820, R819, C820, L820, D802, C821

Check :

Load on secondary output

Overvoltage protection : L832, D814, C814, R814, R815, R816 Oscillator voltage on pin 10 of Q810 :

check C802, R810 replace Q810

Drive circuit : gate voltage of MOSFET Q825 components R812, R813, C813, R825 Regulation circuit

- Measure voltage on pin 6 of Q810 with oscilloscope

-If > 2.5V check the regulation circuit : Q810, D881

R881- R885, C881, C882, R804 - R806, R809, C804, C809

Check Vcc on pin 1 Q810 Vcc = 12V...... 16V

OK

Power supply OK

NOK

Check start circuit and Vcc supply:

 

 

R823, R834, C829, D829, R829, R811, C811

 

 

Replace Q810

 

 

 

 

 

 

 

CL 96532076_037.eps

 

 

290799

Figure 8-18

8.3CD Main Board

The CD main board is built around the compact disc mechanism VAM1250 and a loader 1250. The CDM delivers diode signals and an unequalised high frequency signal. These signals are necessary inputs for the decoder CD10. Based on these signals the decoder will control the disc. The decoder is able to control the sledge, focus motor, radial motor and turn table. When everything is "locked", the decoder delivers a digital output according to IEC958 standard, subcode to the microprocessor and I2S for reproducing analog audio signals by means of a D/A converter.

The microprocessor controls the CD10 and is slave of the master processor on the CDR main board in the DR6050. Both processors communicate via a DSA connection (data, strobe and acknowledge).

25

Image 27
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 Dealer mode Dealer diagnosticsStatus of player 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 MC44603Pin function description Pin NameVCC 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 P816Block Diagram DescriptionMeasurements 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 PackingElectrical Parts List Ceramic CAPElectroly 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.

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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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