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

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

BKPF-L752

1 (E)

6. Schematic Diagrams

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

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

7. Board Layout

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

2 (E)

BKPF-L752

Purpose of this manual

Contents

Manual Structure

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.

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.

Related manuals

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.

The following manual is prepared for this unit.

..

. Installation Manual (Supplied with BKPF-L752)

..

This manual describes the information on BKPF-L752 installing.

BKPF-L752

3 (E)

Section 1

Service Overview

1-1. Notes on Repair Parts

1. Safety Related Components Warning

w

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 common­ality 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.

1-2. IC Link Replacement

w

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

Units Representation

Capacitance uFuF
Inductance uHuH
Resistance Z Abbreviation

n

For the replacement of the DAC-38 board, please buy
BKPF-L752 because DAC-38 mounted circuit board is not
prepared for spare parts.

BKPF-L752

1-1 (E)

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

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

8

1
2
3

4
5
6
7

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

No. Ref. No. Name Function

8 S3 Setting switch

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

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

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

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

4 RV405 CH1 GAIN Adjusts the audio output level of the each channel within the range between _14 dB
5 RV406 CH2 GAIN (_10 dBm output) and +4 dB (+8 dBm output) at _20 dB FS input.
6 RV407 CH3 GAIN n
7 RV408 CH4 GAIN At the factory-out, they were adjusted so as to convert a digital audio signal _20 dB

D3
D814

D815
RV101

RV201
RV301
RV401

Main Board (DAC-38 Board: Side A)

\ OFF: Normal mode

\ OFF: Normal mode

connector

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

connector

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

FS into an analog audio signal +4 dBm.

ON

1234

S3

\\

\ mark)

\\

Indicators

No. Ref. No. Name Color Function

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

Red: A power of ±12 V is abnormal

2 D814 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)

3 D815 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)

1-2 (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

BKPF-L752

Analog audio signal generator

Audio level mater

DAC-38 board

Digital voltmeter

+
_

Input

COM

+
_

+

Output

_

600 Z

Extension board EX-668/731

BKPF-L751

AUDIO

IN

+

+

_

_

1

3

G

G

+

+

_

_

2

4

G

G

REF VIDEO

/WORD CLOCK

IN (OUT)

AES/EBU

*1 *2

OUT

L751

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

BKPF-L752

AES/EBU IN

12

AUDIO OUT

+
_

1

G

+
_

2

G

+
_

3

G

+
_

4

G

L752

BKPF-L752

2-1 (E)

2-2. Preparation for Adjustment
2-3. Power Supply Voltage Adjustment

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.

E6

1

D3
D814

D815
RV101

RV201
RV301
RV401

E3

RV3

ON

1234

S3

1

RV2

E4

E7

1

RV1

TP4
TP3

E2

E1

TP1TP2

E8

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

n

After adjusting the power supply voltage, be sure to
perform “2-4. Input/Output Gain Adjustment”.

2-2 (E)

DAC-38 Board (Side A)

BKPF-L752

2-4. Input/Output Gain Adjustment

The specification value described for this input/output gain
adjustment is set when the gain is 0 dB (during factory
setting). If the customized gain is other than 0 dB, increase
or decrease the specification value proportionally to the
difference of the gain.

Measuring equipment: Audio level meter

1. Set the output of the audio signal generator to
+4.0 dBm, 1 kHz.

2-4. Input/Output Gain Adjustment

CH1 adjustment

2. Connect the generator to the CH1 input of AUIDO IN
connector of the audio A/D converter board (BKPF­L751).

3. Connect the AES/EBU OUT1 connector of the audio
A/D converter board (BKPF-L751) to the AES/EBU
IN1 connector.

4. Connect the audio level meter to the CH1 output of
AUDIO OUT connector.

5. Adjust the CH1 output level on the audio level meter.
Adjustment point: 1RV101/DAC-38 (A-1)
Specification: 4.0 ±0.1 dBm (at 600 Z load)

CH2 adjustment

6. Connect the generator to the CH2 input of AUDIO IN
connector of the audio A/D convertor board (BKPF­L751).

7. Connect the audio level meter to the CH2 output of
AUDIO OUT connector.

8. Adjust the CH2 output level on the audio level meter.
Adjustment point: 1RV201/DAC-38 (A-2)
Specification: 4.0 ±0.1 dBm (at 600 Z load)

CH3 adjustment

9. Connect the generator to the CH3 input of AUDIO IN
connector of the audio A/D converter board (BKPF­L751).

10. Connect the AES/EBU OUT2 connector of the audio
A/D converter board (BKPF-L751) to the AES/EBU
IN2 connector.

11. Connect the audio level meter to the CH3 output of
AUDIO OUT connector.

12. Adjust the CH3 output level on the audio level meter.
Adjustment point: 1RV301/DAC-38 (A-2)
Specification: 4.0 ±0.1 dBm (at 600 Z load)

CH4 adjustment

13. Connect the generator to the CH4 input of AUDIO IN
connector of the audio A/D converter board (BKPF­L751).

14. Connect the audio level meter to the CH4 output of
AUDIO OUT connector.

15. Adjust the CH4 output level on the audio level meter.
Adjustment point: 1RV401/DAC-38 (A-3)
Specification: 4.0 ±0.1 dBm (at 600 Z load)

BKPF-L752

16. After turning off the power, reset the switch (S3) on
the DAC-38 board to the customer settings.

n
0 dBm = 0.775 V rms

2-3 (E)