Sony S530D Home Position Detection, Sled Driver IC802 Sends Voltages to the Stepper Sled Motor

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1
2
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CH1!5 . 00 V=
CH2!5 . 00 V=
C H 3!5 . 00 V= 4
CH4!5 . 00 V=
P M 3 3 9 4 , F L U K E & P H I L I P S

Sled Stepping Motor

 

Name

Location

Voltage/div

 

 

 

 

Channel 1

STVC (ref)

IC701/pin 7

2Vp-p

 

 

 

 

Channel 2

SLDA (inward)

IC701/pin 9

2Vp-p

 

 

 

 

Channel 3

SLDB (outward)

IC701/pin 8

2Vp-p

 

 

 

 

Time base

 

5usec/div.

 

 

 

 

 

The sled motor can be driven manually in either direction to produce the waveforms shown by using the test mode’s manual servo control.

Sled Driver IC802 Sends Voltages to the Stepper Sled Motor

When the input pulses to pulse Sled motor Driver IC802 are not identical to the input reference, the sled motor is driven. At the output, if pulses to the B coil of the stepper type sled motor are lower than the pulses applied to the A coil, the sled moves the laser outward. This can be seen in the waveforms taken at IC802’s output.

Sled Motor Waveforms

All four sled motor drive signals in these waveforms show that the B coil of the stepper motor gets a reduced amplitude pulse to move the laser as- sembly outward.

ch1

ch2

ch3

ch4

STOP

CHP MTB50 . 0ms - 1 . 34dv ch3 -

Outward Sled Drive Waveforms

 

Name

Location

Voltage/div

 

 

 

 

Channel 1

B coil -

CN003/pin 11

5Vp-p

 

 

 

 

Channel 2

B coil +

CN003/pin 8

5Vp-p

 

 

 

 

Channel 3

A coil -

CN003/pin 7

5Vp-p

 

 

 

 

Channel 4

A coil +

CN003/pin 9

5Vp-p

 

 

 

 

Time base

 

50msec/div.

 

 

 

 

 

45

Sled Drive Mute/Inhibit

The sled and loading motors are inhibited when the tray is out. IC601 performs this operation by grounding IC802/pin 9 to stop the driver IC802.

Driver IC 802/pin 9 Mute/Inhibit

IC802/pin 9 Voltage

Mode

 

 

2.3V = normal operation

Tray closed

 

 

0V = tray loading and sled motors inhibited

Tray open

 

 

Home Position Detection

The laser assembly’s home position is identified by a in-limit photodetec- tor within the assembly. The photodetector consists of an IR LED and a photo transistor. Light from the LED passes through an open area to turn on the phototransistor, placing CN003/pin 11 at ground level. When the laser assembly arrives at home position, it blocks the light, permit- ting IC701/pin 23 to go high. IC701 relays this information to Syscon IC201, via IC601 and home is identified.

The verification of this detector is important to determine if IC202 can complete the initial check sequence and remain powered ON.

1.Place the unit in the special test mode (From power OFF, Press front panel buttons RETURN and STOP together. Press MENU on the remote. The unit will power up if IC201 and the power supply are OK).

2.Measure the voltage at MB-85 board, CN003/pin 11.

·3V = Laser at home (by the spindle motor)

·0V = Laser away from home

3.You can manually push the metal laser base to slide the laser.

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Contents Course DVD-02 Course Description and Troubleshooting Page Table of Contents Initial Sled Motor Drive Processing Laser Servo Test Mode KHM-220A DVD Optical BlockTroubleshooting Disc Identification Processing BlockVHS Introduction to the DTS Audio FormatDVD, LD DVD, LD, DTVCD/DVD Player What is DTS?What do I need to play the DTS surround format? Channel Receiver With DTS Decoder AC-3 DecoderCompression Can DVD movies contain both DTS and AC-3 audio tracks?How does DTS work? Adaptive Predictive Coding AdpcmCompression Block MultiplexerPacker Global Bit ManagementBoard Layout DVD Features DVPCommunications Block DiagramPower Supply Servo ControlBlock Diagram Video and Audio Processing ARP2Block Diagram Main Power Supply Power Supply BlockStandby Power Supply Power ConsumptionPower Supply Block Run Standby OscillatorStart Regulation ConceptStandby Oscillator Regulation EnableMain Oscillator Main Oscillator IC201 IC202 Communications Waveforms Power ControlPlug PcontPower Control Post Power on Check Power Control Serial Data Communications BlockParallel Data Communications Block Interface IC201 Serial Data CommunicationsSerial Bus EEProm IC201Serial Data Communications Audio DSP IC501 Serial Data Communications HGA IC601 Parallel Data CommunicationsChip Select Line Parallel Data Communication Communications from IC202 to Other ICs Communications from Another IC to IC202Parallel Data Communication Disc Tray and Laser Platform Position No Power Tray Removal From the BottomMechanism Sled Position No Power Tray Removal From the TopTilt Motor Focus Coil LaserPower on Mechanical Sequence No Disc Power on Mechanical Sequence DVD Disc Page IC201 Turns On the Display Tray Motor DriveInterface Controller IC201 Recognizes the Tray Button IC201 Communicates with System Control IC202Tray Motor Drive IC202 Instructs Hybrid Gate Array IC601 Driver IC802 Translates the CommandTray Position Switch Returns Information to IC201 Tray Motor Drive System Control IC202 uses HGA IC601 Initial Sled Motor DriveInitial Sled Movement HGA IC601 Instructs Servo DSP IC701Initial Sled Motor Drive Servo DSP IC701 Issues Analog Commands to Driver IC802 Sled Still Sled OutwardInitial Sled Motor Drive Sled Drive Mute/Inhibit Home Position DetectionSled Driver IC802 Sends Voltages to the Stepper Sled Motor Initial Sled Motor Drive HGA IC601 to Servo DSP IC701 Communications Laser ServoSystem Control IC202 and HGA IC601 Communications Servo DSP IC701 to RF Amplifier IC001 CommunicationsLaser Servo CD Focus KHM-220A DVD Optical BlockDVD Focus Three Laser Beams from One Laser Photo Detectors TE +, TZCPage Operation Disc IdentificationSacd Disc Type Disc Identification Concept Servo FocusSearch Focus System Control IC202 to Servo IC701 Focus DriveFocus Search Communications System Control IC202 to HGA IC701Focus HGA IC601 to Servo IC701 SdcpsFocus DVD Kick ModeSpindle Motor Spindle Motor MDP CLV PB ModeMDS Spindle Motor System Control IC202 Uses HGA IC601 Tracking ServoTrack Counting in Pause or Picture Jump Tracking Servo Sled Movement to Another Location IC Summary ChartSled Motor Drive PB Following the TrackSled Motor Drive PB Tilt to Mid Position Tilt ServoTilt UP ICs InvolvedTilt Servo DVD Playback Power OFFManually Driving the Tilt Motor Tilt Servo Audio/Video Processing Block Process Blocks Processing RF Amp IC001Processing Flash ROM IC205 Video Process CH12O Converters IC902, IC905 IC907CH78O CH34OAudio Processing Tests Test ModeTest Mode Access Test Mode Access Video Level Adjustment Additional Test ModeSelf-Diagnostic Function Customer Error Codes Clearing Emergency CodesPage Troubleshooting No Power onNo DVD OSD logo No DVD PB CD PB OKNo DVD DL PB other discs PB OK No Disc PB
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