Marantz DR-6000, MAR770, MAR775 Test instructions, Supply voltages, Clock signal, Control signals

Page 19

8.1.2 Test instructions

Grid lines

 

Level and timing of all grid lines, G1-->G15, can be checked

Supply voltages

either at the FTD itself or at the display controller. Grid lines

The display board receives several voltages via connector

G13, G14 and G15 each have an extra current amplifier in line

JY01.

: QY02 for G13, QY03 for G14 and QY04 for G15. A typical

• VFTD : -35V ±5% measured at pin 2 of conn. JY01.

grid line signal shows in the oscillogram below.

VDC1-VDC2 : 3V8 ±10% measured between pin 1 and 3 of

 

 

 

 

 

conn. 1119.

 

 

PM3392A

 

 

 

+5V

+5V: ±5% measured at pin 10 of conn. JY01

 

 

 

 

 

 

 

Voltages VFTD, VDC1 and VDC2 are produced in the power

 

 

 

 

supply unit and sent to the display board via the CDR main

+4V

 

 

 

board. The +5V voltage is produced on the CDR main board as

0V

 

 

 

D5V.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Clock signal

 

 

 

 

 

 

 

As clock driver for the display controller, a resonator of 8 MHz

 

 

 

 

(XY01) is used. The signal can be measured at pins 8 and 9 of

 

 

 

 

the display controller : 8 MHz ±5%.

 

 

 

 

 

Control signals

 

 

-38V

 

 

 

RESET

 

 

 

 

 

 

 

 

The reset signal comes via pin 4 of conn. JY01 from the DASP

 

 

 

 

master processor on the CDR main board (SYS_RESET). The

CH1! 10.0

V=

M TB1. 00ms

ch 1+

reset is low active. It should be kept low during power up for at

 

 

 

CL 96532076_024.eps

least 3 machine cycles with supply voltage in operating range

 

 

 

290799

 

 

 

 

and a stable clock signal (1 machine cycle = 12 x 1/Fc (8 MHz)

 

 

 

 

sec.). During normal operation, the reset should be high (3V3).

 

Figure 8-3 ‘Gridline’

 

The high signal is 3V3 because the DASP operates on 3V3.

 

 

 

 

 

 

I2C DATA/I2C CLK

 

 

Segment lines

 

 

 

 

Level and timing of all segment lines, P1-->P21, can be

These lines connect to the DASP master processor via

checked either at the FTD itself or at the display controller.

respectively pin 5 and pin 7 of conn. JY01. When there is no

The data on these segment lines however, depends on the

communication, they should have the high level (+5V). The

characters displayed. The oscillogram below shows a

oscillogram below gives an indication of how these signals

segment line with data. A segment line without data

should look like.

 

 

 

 

maintains a -38V level.

 

 

 

 

 

 

 

 

 

 

 

PM33 92A

 

 

 

PM33 92A

 

 

 

 

 

 

 

 

 

 

 

+5V

 

 

 

 

 

+5V

 

 

 

 

 

 

 

 

0V

 

 

 

 

 

 

 

 

 

 

 

 

I2C DATA

 

 

 

 

 

 

 

 

 

0V

 

 

 

 

 

 

 

 

 

+5V

 

 

 

 

 

 

 

 

 

I2C CLK

 

 

 

 

 

-35V

 

 

 

 

 

 

 

 

 

 

 

 

0V

CH1! 2. 00 V =

 

 

CH1! 10 .0

V=

M TB1. 00ms

ch 1+

 

 

 

 

CH2

2

V=

M TB10.0m s

ch 1+

 

 

 

CL 96532076_027.eps

 

 

 

 

 

CL 96532076_025.eps

 

 

 

290799

 

 

 

 

 

 

 

 

 

 

 

 

 

 

290799

 

 

 

 

 

 

 

Figure 8-2 ‘I2C signals’

 

 

Figure 8-4 ‘Segment line’

 

 

 

 

 

 

 

 

 

FTD drive lines

Filament voltage

Should measure 3.8V ±10% (=VDC1-VDC2) between pins 1-3 and pins 1-52 of the FTD(VX01).

Key matrix lines

The lines connected to pins 34, 35, 36 and 37 of the display controller act as matrix scanners. Without a key pressed, they maintain a low level. As soon as a key is pressed, the scanning line connected to that key puts out a scanning signal, which should look like the oscillogram below. This scanning signal goes via the pressed key to I/O port 4 of the display controller (pins 28 to 33). The display controller can now determine which key has been pressed. Without a key pressed, pins 28 to 33 of the display controller maintain a high level (+5V).

17

Image 19
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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