Sony BKPF-L752 User manual

AUDIO D/A CONVERTER BOARD

BKPF-L752

MAINTENANCE MANUAL

1st Edition

Serial No. 10001 and Higher

!WARNING

This manual is intended for qualified service personnel only.

To reduce the risk of electric shock, fire or injury, do not perform any servicing other than that

contained in the operating instructions unless you are qualified to do so. Refer all servicing to

qualified service personnel.

!WARNUNG

Die Anleitung ist nur für qualifiziertes Fachpersonal bestimmt.

Alle Wartungsarbeiten dürfen nur von qualifiziertem Fachpersonal ausgeführt werden. Um die

Gefahr eines elektrischen Schlages, Feuergefahr und Verletzungen zu vermeiden, sind bei

Wartungsarbeiten strikt die Angaben in der Anleitung zu befolgen.Andere als die angegeben

Wartungsarbeiten dürfen nur von Personen ausgeführt werden, die eine spezielle Befähigung

dazu besitzen.

!AVERTISSEMENT

Ce manual est destiné uniquement aux personnes compétentes en charge de l’entretien.Afin

de réduire les risques de décharge électrique, d’incendie ou de blessure n’effectuer que les

réparations indiquées dans le mode d’emploi à moins d’être qualifié pour en effectuer d’autres.

Pour toute réparation faire appel à une personne compétente uniquement.

BKPF-L752

1 (E)

BKPF-L752

Table of Contents

Manual Structure

Purpose of this manual ........................................................................................ 3 (E)

Contents ............................................................................................................... 3 (E)

Related manuals................................................................................................... 3 (E)

1. Service Overview

1-1. Notes on Repair Parts............................................................................1-1 (E)

1-2. IC Link Replacement ............................................................................1-1 (E)

1-3. Name and Function of Switch/Indicator/etc. ........................................1-2 (E)

2. Electrical Alignment

2-1. Electrical Alignment Overview.............................................................2-1 (E)

2-1-1. Required Equipment and Tools............................................2-1 (E)

2-1-2. Connection ...........................................................................2-1 (E)

2-2. Preparation for Adjustment ...................................................................2-2 (E)

2-3. Power Supply Voltage Adjustment .......................................................2-3 (E)

2-4. Input/Output Gain Adjustment..............................................................2-3 (E)

3. Spare Parts

CN-1858/1859 ........................................................................................................3-1

DAC-38 ..................................................................................................................3-1

4. Semiconductor Pin Assignments

5. Block Diagram

OVERALL .............................................................................................................5-1

2 (E) BKPF-L752

6. Schematic Diagrams

CN-1858/1859 ........................................................................................................6-1

DAC-38 ..................................................................................................................6-2

7. Board Layout

DAC-38 ..................................................................................................................7-1

3 (E)

BKPF-L752

Purpose of this manual This manual is the maintenance manual of Audio D/A Converter Board

BKPF-L752.

This manual is intended for use by trained system and service engineers, and

describes the information for periodic maintenance and detailed service.

Contents This manual is organized by following sections.

Section 1 Service Overview

This section explains the notes on repair parts and IC link replacement.

Section 2 Electrical Alignment

This section explains the adjustment after replacing part.

Section 3 Spare Parts

This section describes the spare parts.

Section 4 Semiconductor Pin Assignments

This section describes the pin assignments of semiconductor.

Section 5 Block Diagram

This section describes the overall block diagram.

Section 6 Schematic Diagrams

This section describes the schematic diagrams of the DAC-38 and CN-1858/1859

boards.

Section 7 Board Layout

This section describes the board layout for the DAC-38 board.

Related manuals The following manual is prepared for this unit.

.Installation Manual (Supplied with BKPF-L752)

This manual describes the information on BKPF-L752 installing.

Manual Structure

1-1 (E)

BKPF-L752

Section 1

Service Overview

1-2. IC Link Replacement

An IC link is critical parts to safe operation.

Replace this component with Sony parts whose part

numbers appear in this manual published by Sony.

If not, this may cause a fire or electric shock.

Be sure to use the specified component in this manual.

The IC link is mounted on the DAC-38 board. Be sure to

replace with the specified IC link as shown below after

removing the foreign substances that may cause the shorts.

DAC-38 Board

Ref No. (Address) Description Part No.

PS1 (H-3) IC link 2 A !1-533-282-21

1-1. Notes on Repair Parts

1. Safety Related Components Warning

Components marked !are critical to safe operation.

Therefore, specified parts should be used in the case of

replacement.

2. Standardization of Parts

Some repair parts supplied by Sony differ from those

used for the unit. These are because of parts common-

ality and improvement.

Parts list has the present standardized repair parts.

3. Stock of Parts

Parts marked with “o” at SP (Supply code) column of

the spare parts list may not be stocked. Therefore, the

delivery date will be delayed.

4. Units Representation

The following represented units are changed or

omitted in writing.

Units Representation

Capacitance uFuF

Inductance uHuH

Resistance ZAbbreviation

For the replacement of the DAC-38 board, please buy

BKPF-L752 because DAC-38 mounted circuit board is not

prepared for spare parts.

1-2 (E) BKPF-L752

D814

D815

RV101

RV201

RV301

RV401

1234

1-3. Name and Function of Switch/Indicator/etc.

Main Board (DAC-38 Board: Side A)

Switches/gain adjusting VRs (Factory default settings are indicated by a \\

\mark)

No. Ref. No. Name Function

8S3 Setting switch

S3-1 TEST 1 ON: Test mode (Factory use)

\OFF: Normal mode

S3-2 TEST 2 ON: Test mode (Factory use)

\OFF: Normal mode

S3-3 AES/EBU 1 DE-EMPHASIS ON: When the de-emphasis is on for the signals input to the AES/EBU IN 1

connector

\OFF: When the de-emphasis is off for ones

S3-4 AES/EBU 2 DE-EMPHASIS ON: When the de-emphasis is on for the signals input to the AES/EBU IN 2

connector

\OFF: When the de-emphasis is off for ones

4RV405 CH1 GAIN Adjusts the audio output level of the each channel within the range between _14 dB

5RV406 CH2 GAIN (_10 dBm output) and +4 dB (+8 dBm output) at _20 dB FS input.

6RV407 CH3 GAIN n

7RV408 CH4 GAIN At the factory-out, they were adjusted so as to convert a digital audio signal _20 dB

FS into an analog audio signal +4 dBm.

Indicators

No. Ref. No. Name Color Function

1D3 POWER (±12 V) Green/red Green: A power of ±12 V is normal

Red: A power of ±12 V is abnormal

2D814 AES/EBU 1 IN Green/red Green: When a digital audio signal is input to the AES/EBU IN 1 connector

Red: When no signal is normally input to the AES/EBU IN 1 connector

(including the case where no signal is input)

3D815 AES/EBU 2 IN Green/red Green: When a digital audio signal is input to the AES/EBU IN 2 connector

Red: When no signal is normally input to the AES/EBU IN 2 connector

(including the case where no signal is input)

1-3. Name and Function of Switch/Indicator/etc.

2-1 (E)

BKPF-L752

Section 2

Electrical Alignment

2-1. Electrical Alignment Overview

2-1-1. Required Equipment and Tools

Use the equipment listed below or the equivalent.

Item Model Remarks

Extension board EX-668 (Part No. A-8318-552-A) For PFV-L1

EX-731 (Part No. A-8322-598-A) For PFV-L10

Analog audio signal generator *SG505 (Option 02)

Audio level meter *—

Interface unit Sony PFV-L1 or PFV-L10

Audio A/D converter board *Sony BKPF-L751 Factory default condition

Digital voltmetor *—

Adjustment screwdriver — Insulation type

Resister (600 Z , within 1 %) with lead

*: Use the equipment after calibration has been completed.

2-1-2. Connection

PFV-L1/L10 (Rear)PFV-L1/L10 (Side)

Extension board EX-668/731

Audio level mater

DAC-38 board

Input

Analog audio signal generator

Output

Digital voltmeter

COM

600 Z

BKPF-L752

L752

AUDIO OUT

AES/EBU IN

BKPF-L751

L751

*1*2

IN (OUT)

AUDIO

REF VIDEO

/WORD CLOCK

AES/EBU

OUT

BKPF-L752

2-2 (E) BKPF-L752

2-2. Preparation for Adjustment

1. Extend the DAC-38 board with a extension board.

2. Write down the customer settings of the switch (S3) on

the DAC-38 board in following table.

3. Set the switch S3 as follows:

Ref. No. (Address) Setting at adj. Customer setting

S3 (F-1) No. 1: OFF OFF

No. 2: OFF OFF

No. 3: OFF

No. 4: OFF

4. Install the main board (ADC-40 board) of the audio

A/D converter board (BKPF-L751’s audio input/

output gain in a factory default condition) to the

interface unit.

Factory default condition (RV405, 406, 407, 408/

ADC-40 board):

Each VR was completed the adjustment so as to

convert a +4.0 dBm to _20 dB FS.

5. Install the connector panel of the audio A/D converter

board (BKPF-L751) to the interface unit after setting

the LOOP/WORD switch to WORD CLK OUT (upper

position).

6. Turn on the power of equipment, and warm up them

for about ten minutes.

2-2. Preparation for Adjustment

2-3. Power Supply Voltage Adjustment

Measuring equipment: Digital voltmeter

1. Set the digital voltmeter as follows:

Range: AUTO

Mode: DC V

+5 V adjustment for Analog line

2. Connect the probe of the digital voltmeter as follows:

+: TP1/DAC-38 (G-2)

_: E7/DAC-38 (C-2)

3. Adjust the voltage on the digital voltmeter.

Adjustment point: 1RV1/DAC-38 (G-2)

Specification: 4.75 ±0.05 V dc

+5 V adjustment for Digital line

4. Connect the probe of the digital voltmeter as follows:

+: TP2/DAC-38 (F-2)

_: E2/DAC-38 (F-2)

5. Adjust the voltage.

Adjustment point: 1RV2/DAC-38 (F-2)

Specification: 4.75 ±0.05 V dc

±12 V adjustment

6. Connect the probe of the digital voltmeter as follows:

+: TP3/DAC-38 (D-3)

_: TP4/DAC-38 (D-3)

7. Adjust the voltage.

Adjustment point: 1RV3/DAC-38 (E-2)

Specification: +25.10 ±0.05 V dc

8. Connect the probe of the digital voltmeter as follows:

+: TP3/DAC-38 (D-3)

_: E7/DAC-38 (C-2)

9. Check the voltage.

Specification: +12.55 ±0.15 V dc

10. Connect the probe of the digital voltmeter as follows:

+: E7/DAC-38 (C-2)

_: TP4/DAC-38 (D-3)

11. Check the voltage.

Specification: _12.55 ±0.15 V dc

After adjusting the power supply voltage, be sure to

perform “2-4. Input/Output Gain Adjustment”.

DAC-38 Board (Side A)

1234

TP1TP2

RV1

RV2

RV3

D814

D815

RV101

RV201

RV301

RV401

TP4

TP3

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