Sony BKPFL-751 Service manual
AUDIO A/D CONVERTER BOARD
BKPF-L751
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-L751
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. +5 V Power Supply Voltage Adjustment .............................................2-2 (E)
2-4. Word-clock Frequency Adjustment ......................................................2-3 (E)
2-5. Input/Output Gain Adjustment..............................................................2-3 (E)
2-6. CMRR (Common Mode Rejection Ratio) Adjustment.........................2-4 (E)
BKPF-L751
3. Spare Parts
ADC-40 ..................................................................................................................3-1
CN-1857/1858 ........................................................................................................3-5
4. Semiconductor Pin Assignments
5. Block Diagram
OVERALL .............................................................................................................5-1
1 (E)
6. Schematic Diagrams
ADC-40 ..................................................................................................................6-2
CN-1857/1858 ........................................................................................................6-8
7. Board Layouts
ADC-40 ..................................................................................................................7-1
CN-1857 ................................................................................................................. 7-2
2 (E)
BKPF-L751
Purpose of this manual
Contents
Manual Structure
This manual is the maintenance manual of Audio A/D Converter Board
BKPF-L751.
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 ADC-40 and CN-1857/1858
boards.
Section 7 Board Layouts
This section describes the board layouts for the ADC-40 and CN-1857 boards.
The following manual is prepared for this unit.
..
. Installation Manual (Supplied with BKPF-L751)
..
This manual describes the information on BKPF-L751 installing.
BKPF-L751
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 ADC-40 board. Be sure to
replace with the specified IC link as shown below after
removing the foreign substances that may cause the shorts.
ADC-40 Board
Ref No. (Address) Description Part No.
PS1 (K-3) IC link 2 A !1-533-282-21
Units Representation
Capacitance uFuF
Inductance uHuH
Resistance Z Abbreviation
n
For the replacement of the ADC-40 board, please buy
BKPF-L751 because ADC-40 mounted circuit board is not
prepared for spare parts.
BKPF-L751
1-1 (E)
1-3. Name and Function of Switch/Indicator1-3. Name and Function of Switch/Indicator1-3. Name and Function of Switch/Indicator/etc.
1-3. Name and Function of Switch/Indicator/etc.
!= ![
!\1
!;!]
2
3
5
7
9
!-
4
6
8
0
D808
D807
D809
ON
S401
RV405
ON
S402
RV406
ON
S403
RV407
ON
S404
RV408
NORMAL
S705
VIDEO
SWAP
WORD
SYNG
S5
NORMAL
S1
HIGH
S4
S3
OFF ON
HDNTSC
PAL
Main Board (ADC-40 Board: Side A)
Switches/gain adjusting VRs (Factory default settings are indicated by a
\\
\ mark)
\\
No. Ref. No. Name Function
!] S1 WORD SYNC SELECT Selects the output level of the regenerated-word-clock signal output to the REF VIDEO/
WORD CLOCK (OUT) connector.
\ NORMAL: 1 V p-p
HIGH: 2.8 V p-p (using the traditional digital audio models)
!; S3 75 Z 75 Z termination ON/OFF switch for the REF VIDEO/WORD CLOCK IN connector.
\ OFF: When using the loop-through connection
ON: Otherwise
!\ S4 VIDEO SELECT Selects the signal method of the video reference input signal.
(Valid only when S5 is set to VIDEO.)
\ NTSC PAL: NTSC or PAL method
HD: HD method
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 * Tektronix SG505 (Option 02)
Audio level meter * —
Interface unit Sony PFV-L1 or PFV-L10
Audio D/A convertor board * Sony BKPF-L752 Factory default condition
Digital voltmetor * —
Frequency counter * Advantest TR5821AK
Oscilloscope * Tectronix 2465B
Adjustment screwdriver — Insulation type
Terminator — BNC type (feed-through), 75 Z
Resister (600 Z, within 1 %) with lead
*: Use the equipment after calibration has been completed.
2-1-2. Connection
BKPF-L751
(At CMRR adjustment)
Frequency counter
Audio level mater
Input
ADC-40 board
Analog audio signal generator
(At Gain adjustment)
+
_
COM
Input
Digital voltmeter
+
_
+
600 Z
_
Extension board EX-668/731
+
_
COM
Terminator
Oscilloscope
CH2
OUT
CH2
IN
BKPF-L752
AES/EBU IN
12
AUDIO OUT
+
+
_
_
123
G
G
+
+
_
_
4
G
G
PFV-L1/L10 (Rear)PFV-L1/L10 (Side)
AUDIO
IN
+
_
1
G
+
_
2
G
REF VIDEO
/WORD CLOCK
IN (OUT)
AES/EBU
*1 *2
OUT
BKPF-L751
+
_
3
G
+
_
4
G
L751
BKPF-L751
L752
2-1 (E)
2-2. Preparation for Adjustment
2-3. +5 V Power Supply Voltage Adjustment
2-2. Preparation for Adjustment
1. Remove the connector panel of the BKPF-L751.
2. Write down the customer setting of the switch S1
(LOOP/WORD switch) on the CN-1857 board of the
connector panel in following table.
3. Extend the ADC-40 board with a extension board.
4. Write down the customer settings of each switch on
the ADC-40 board in following table.
5. Set the switches on the CN-1857 and ADC-40 boards
as follows:
Board Ref. No. Setting at adj. Customer
(Address) setting
CN-1857 S1 WORD CLK OUT
ADC-40 S1 (H-2) NORMAL
S3 (K-2) ON
S4 (J-3) NTSC PAL
S5 (G-1) VIDEO
S401 (A-1) ON
S402 (A-2) ON
S403 (A-2) ON
S404 (A-3) ON
S705 (G-1) NORMAL
2-3.
++
+5 V Power Supply Voltage
++
Adjustment
Measuring equipment: Digital voltmeter
1. Set the digital voltmeter as follows:
Range: AUTO
Mode: DC V
++
+5 V adjustment for Digital line
++
2. Connect the probe of the digital voltmeter as follows:
+: TP1/ADC-40 (J-3)
_: E1/ADC-40 (C-1)
3. Adjust the voltage on the digital voltmeter.
Adjustment point: 1RV1/ADC-40 (J-3)
Specification: 4.81 ±0.05 V dc
++
+5 V adjustment for Analog line
++
4. Connect the probe of the digital voltmeter as follows:
+: TP2/ADC-40 (G-3)
_: E10/ADC-40 (G-2)
5. Adjust the voltage.
Adjustment point: 1RV2/ADC-40 (G-3)
Specification: 4.81 ±0.05 V dc
6. Reattach the connector panel of the BKPF-L751.
7. Install the audio D/A convertor board (BKPF-L752 in
a factory default condition) to the interface unit.
Factory default condition of BKPF-L752.
. DIP switch (S3/DAC-38 board): All OFFs
. Adjust VRs (RV101, 201, 301, 401/DAC-38):
Each VR was completed the adjustment so as to
convert a _20 dB FS to +4.0 dBm.
8. Turn on the power of equipment, and warm up them
for about ten minutes.
E1
S401
S402
S403
S404
ON
ON
ON
ON
1 RV401
RV405
1 RV402
RV406
1 RV403
RV407
1 RV404
RV408
n
When adjusting the power supply voltage, be sure to
perform Sections 2-4 and later.
WORD
VIDEO
SYNG
NORMAL
SWAP
S5
S705
S1
NORMAL
E10
RV1000 1
HIGH 0-5V
S4
PAL
TP2 TP1
S3
OFF ON
HDNTSC
1 RV11 RV2
2-2 (E)
ADC-40 Board (Side A)
BKPF-L751
2-4. Word-clock Frequency Adjustment
2-5. Input/Output Gain Adjustment
2-4. Word-clock Frequency Adjustment
Measuring equipment: Oscilloscope and Frequency counter
1. Connect the oscilloscope’s CH2 output to the frequency counter.
2. Connect the oscilloscope’s CH2 input to the REF
VIDEO/WORD CLOCK (OUT) connector.
2. Set the oscilloscope as follows:
CH2: DC 500 mV/DIV
TIME: 5 us/DIV
TRIG: CH2, + slope
Band limit: ON
3. Adjust the frequency on the frequency counter.
Adjustment point: 1RV1000/ADC-40 (G-2)
Specification: 48,000 ±48 Hz
4. Check the level on the oscilloscope with a 75 Z
terminator.
When the S1/ADC-40 (H-2) is set to NORMAL:
Specification: A = 1.0 ±0.1 V p-p
When the S1/ADC-40 (H-2) is set to HIGH 0-5V:
Specification: B > 2.4 V dc
S1 : NORMAL
A
2-5. Input/Output Gain Adjustment
Measuring equipment: Audio level meter
1. Set the analog audio signal generator to +4.0 dBm,
1 kHz.
CH1/2 adjustment
2. Connect the generator to the CH1 input of AUDIO IN
connector.
3. Connect the AES/EBU IN1 connector of the audio
D/A converter board (BKPF-L752) to the AES/EBU
OUT1 connector.
4. Connect the audio level meter to the CH1 output of
AUDIO OUT connector of the audio D/A converter
board (BKPF-L752).
5. Adjust the CH1 output level on the audio level meter.
Adjustment point: 1RV405/ADC-40 (A-1)
Specification: 4.0 ±0.1 dBm (at 600 Z load)
6. Connect the generator to the CH2 input of AUDIO IN
connector.
7. Connect the audio level meter to the CH2 output of
AUDIO OUT connector of the audio D/A converter
board (BKPF-L752).
8. Adjust the CH2 output level.
Adjustment point: 1RV406/ADC-40 (A-2)
Specification: 4.0 ±0.1 dBm (at 600 Z load)
S1 : HIGH
B
BKPF-L751
0 Vdc
(GND)
CH3/4 adjustment
9. Connect the generator to the CH3 input of AUDIO IN
connector.
10. Connect the AES/EBU IN2 connector of the audio
D/A converter board (BKPF-L752) to the AES/EBU
OUT2 connector.
11. Connect the audio level meter to the CH3 output of
AUDIO OUT connector of the audio D/A converter
board (BKPF-L752).
12. Adjust the CH3 output level.
Adjustment point: 1RV407/ADC-40 (A-3)
Specification: 4.0 ±0.1 dBm (at 600 Z load)
13. Connect the generator to the CH4 input of AUDIO IN
connector.
14. Connect the audio level meter to the CH4 output of
AUDIO OUT connector of the audio D/A converter
board (BKPF-L752).
15. Adjust the CH4 output level.
Adjustment point: 1RV408/ADC-40 (A-3)
Specification: 4.0 ±0.1 dBm (at 600 Z load)
n
0 dBm = 0.755 Vrms
2-3 (E)
2-6. CMRR (Common Mode Rejection Ratio) Adjustment
2-6. CMRR (Common Mode Rejection
Ratio) Adjustment
Measuring equipment: Audio level meter
1. Set the analog audio signal generator to +18.0 dBm,
60 Hz.
Refer to Section 2-1-2 for the connection.
CH1/2 adjustment
2. Connect the generator to the CH1 input of AUDIO IN
connector.
3. Connect the AES/EBU IN1 connector of the audio
D/A converter board (BKPF-L752) to the AES/EBU
OUT1 connector.
4. Connect the audio level meter to the CH1 output of
AUDIO OUT connector of the audio D/A converter
board (BKPF-L752).
5. Adjust the CH1 output level on the audio level meter.
Adjustment point: 1RV401/ADC-40 (A-1)
Specification: Minimum (_65 dBm or less)
6. Connect the generator to the CH2 input of AUDIO IN
connector.
7. Connect the audio level meter to the CH2 output of
AUDIO OUT connector of the audio D/A converter
board (BKPF-L752).
8. Adjust the CH2 output level.
Adjustment point: 1RV402/ADC-40 (A-2)
Specification: Minimum (_65 dBm or less)
CH3/4 adjustment
9. Connect the generator to the CH3 input of AUDIO IN
connector.
10. Connect the AES/EBU IN2 connector of the audio
D/A converter board (BKPF-L752) to the AES/EBU
OUT2 connector.
11. Connect the audio level meter to the CH3 output of
AUDIO OUT connector of the audio D/A converter
board (BKPF-L752).
12. Adjust the CH3 output level.
Adjustment point: 1RV403/ADC-40 (A-2)
Specification: Minimum (_65 dBm or less)
13. Connect the generator to the CH4 input of AUDIO IN
connector..
14. Connect the audio level meter to the CH4 output of
AUDIO OUT connector of the audio D/A converter
board (BKPF-L752).
15. Adjust the CH4 output level.
Adjustment point: 1RV404/ADC-40 (A-3)
Specification: Minimum (_65 dBm or less)
16. After turning off the power, reset the switches on the
CN-1857 and ADC-40 boards to the customer settings.
2-4 (E)
n
0 dBm = 0.775 Vrms
BKPF-L751
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