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
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
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 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
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.

1-2 (E) BKPF-L752
D3
S3
ON
D814
D815
RV101
RV201
RV301
RV401
3
2
1
4
5
6
7
8
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
+
_
+
_
G
+
_
G
+
_
G
+
_
G
1
2
3
4
L752
12
AUDIO OUT
AES/EBU IN
+
_
BKPF-L751
+
_
G
+
_
G
+
_
G
+
_
G
1
2
3
4
L751
*1*2
IN (OUT)
AUDIO
IN
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
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”.
DAC-38 Board (Side A)
S3
ON
1234
E3
E6
E8
E1
E2
TP1TP2
RV1
1
RV2
1
RV3
1
D3
D814
D815
RV101
RV201
RV301
RV401
E4
E7
TP4
TP3