Marantz DR-6000, MAR770, MAR775 service manual HF Path, DC Settings

Page 31

8.3.7HF Path

Description

The pre-amplified HF-signal is presented to both n=1 and n=2 amplifier circuits. The mux/demux switches via software and micro processor controlled S1 and S2 lines between either one of the amplified n=1 or n=2 signals. The signal will then follow

another amplification and filtering circuit. The filtering again is controlled by the S1 and S2 lines, dependant on whether the disc starts up (speed n=1, S1 and S2 Low), disc plays at speed n=1 (S1 Low, S2 High) or disc plays at speed n=2 (S1 and S2 High).

n-dependant filtering

DUAL 4 CHANNEL

 

MUX/DEMUX

n=1 AMP

 

 

3173

3174

 

 

430R

430R

2140

180p

 

 

 

 

HFGND

F157

2143

 

 

 

330p

 

 

2

 

 

 

n=2 AMP

 

 

E AMP

 

 

 

3191

3192

 

 

430R

430R

2162

100p

 

 

 

2164

HFGND

 

 

 

 

180p

 

 

 

+5VHF

 

+5VHF

 

 

7025

 

 

 

 

2130

 

16

74HCT4052D

 

 

 

 

 

 

 

 

 

 

 

 

HFGND

 

 

VCC

 

 

0

 

3169

 

100n

 

 

4x

0

 

2K7

 

7

 

 

 

 

 

 

 

VEE

 

3

1

 

 

 

 

 

 

8

GND

 

 

G4

 

 

 

 

 

 

 

 

 

 

 

 

HFGND

 

 

 

 

 

 

 

 

7023

 

HFGND 1

0

 

 

 

 

 

BFS20

 

 

 

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

2141

 

 

 

 

 

 

 

 

 

 

12

 

 

 

 

 

 

 

 

2n2

 

14

 

 

 

 

 

3180

2K7

390p

2146

 

15

 

 

 

 

 

2149

1n5

 

11

 

 

 

 

 

 

HFGND

680p

 

 

 

 

 

 

 

+5VHF

 

 

 

 

 

+5VHF

 

 

3188

2K7

 

HF

 

 

 

 

3189

 

390R

 

 

 

 

 

 

 

 

 

 

 

7009

 

 

22n

2160

47u

2161

3193

 

180R

 

BFS20

 

 

 

 

 

 

HFGND

HFGND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1K

 

 

 

 

 

 

 

 

 

3196

 

 

 

 

 

 

HF

 

 

 

BC858B

 

 

 

 

 

 

 

 

7007

 

 

3203

HFGND

 

7010

 

 

3205

 

10K

 

 

HFGND

 

 

2K7

 

 

BC848B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HFGND

 

 

 

 

Figure 8-28

10

 

 

 

 

 

 

S1

3

 

 

 

 

 

 

 

 

 

9

 

 

 

 

 

 

S2

 

6

 

 

 

 

 

 

 

 

 

22n

 

2137

22n

 

2138

 

 

 

 

 

 

 

 

HFGND

 

 

 

 

 

 

 

 

 

3

 

HFGND HFGND

 

 

 

7000

 

 

 

 

 

 

 

 

HF

 

 

 

 

 

SAA7324

 

 

HFIN

2142

F309

 

 

 

 

 

1 HFREF

 

13

 

F156

3178

22n

2145

 

 

 

 

 

HFGND F310

47p

 

2

HFIN

 

 

 

 

 

 

 

 

 

1K

2150

3181

 

 

 

 

 

 

 

 

 

 

3

ISLICE

 

 

 

 

 

 

 

 

 

 

 

 

 

47n

22K

F159

 

FRONT

 

 

 

 

HFGND

 

 

4

VSSA1

 

9

 

 

 

 

 

 

 

END

F313

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

VDDA1

 

 

 

 

 

 

 

 

 

HF

CL96532086_057.eps 080999

DC Settings

Set the power and reset connections as described above in "1.1.1. Supply Voltages". Check the following voltages :

Force

S1 and S2 “HIGH”

S1 and S2 “LOW”

S1 and S2 “HIGH”

S1 and S2 “LOW”

S1 and S2 “HIGH”

S1 and S2 “LOW”

Pin

Emitter

Collector

Collector

13

13

3

3

Location

7006

7010

7010

7025

7025

7025

7025

Measure

2.4± 10%

1.9± 10%

1.9± 10%

1.6± 10%

1.6± 10%

3.2± 10%

3.2± 10%

CL96532086_058.eps 080999

Figure 8-29

29

Page 30 Page 32
Image 31
Page 30 Page 32
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 diagnostics Dealer modeStatus 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 Name Pin function descriptionVCC 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 P816Description Block DiagramMeasurements 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 PackingCeramic CAP Electrical Parts ListElectroly 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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