Sony BKPF-L753A User Manual
ANALOG AUDIO DISTRIBUTION BOARD
BKPF-L753A
MAINTENANCE MANUAL
1st Edition (Revised 1)
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-L753A
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. Shield Case (S/N10001 through S/N17325) ......................................... 1-1 (E)
1-4. Name and Function of Switch/Indicator/etc. ........................................1-2 (E)
1-5. Unleaded Solder ....................................................................................1-3 (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 of Adjustment ....................................................................2-2 (E)
2-3. Input/Output Gain Adjustment..............................................................2-2 (E)
2-4. CMRR (Common Mode Rejection Ratio) Adjustment.........................2-3 (E)
2-5. Input/Output Gain Adjustment for Customer Setting ...........................2-3 (E)
3. Spare Parts
ADA-55 ..................................................................................................................3-1
CN-1855/1856 ........................................................................................................3-4
DD-36 .....................................................................................................................3-4
4. Semiconductor Pin Assignments
5. Block Diagram
BKPF-L753A
Overall ....................................................................................................................5-1
1 (E)
6. Schematic Diagrams
ADA-55 .................................................................................................................. 6-2
CN-1855/1856 ........................................................................................................ 6-3
DD-36 .....................................................................................................................6-4
7. Board Layouts
ADA-55 .................................................................................................................. 7-1
DD-36 .....................................................................................................................7-2
2 (E)
BKPF-L753A
Purpose of this manual
Contents
Manual Structure
This manual is the maintenance manual of Analog Audio Distribution Board
BKPF-L753A.
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 ADA-55, DD-36 and
CN-1855/1856 boards.
Section 7 Board Layouts
This section describes the board layouts for the ADA-55 and DD-36 boards.
The following manual is prepared for this unit.
..
. Installation Manual (Supplied with BKPF-L753A)
..
This manual describes the information on BKPF-L753A installing.
BKPF-L753A
3 (E)
Section 1
Shield case
DD-36 board
ADA-55 board
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.
Units Representation
Capacitance uFuF
Inductance uHuH
Resistance Z Abbreviation
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 ADA-55 board. Be sure to
replace with the specified IC link as shown below after
removing the foreign substances that may cause the shorts.
ADA-55 Board
Ref No. (Address) Description Part No.
PS1 (K-3) IC link 2 A !1-533-282-21
1-3. Shield Case
(S/N10001 through S/N17325)
The shield case is a component to shield the DD-36 board.
Before checking the DD-36 board, unsolder and remove
this shield case.
n
For the replacement of the ADA-55 board, please buy
BKPF-L753A because ADA-55 mounted circuit board is
not prepared for spare parts.
BKPF-L753A
1-1 (E)
1-4. Name and Function of Switch/Indicator/etc.
1-4. Name and Function of Switch/Indicator/etc.
1
2
3
4
5
+8+40_4_8
COR2
RV4
D1
+8+40_4_8
RV3
6
COR3
COR1
MO
ST
7 8
S1
S2
Main Board (ADA-55 Board: Side A)
Switches/shorting plugs (Factory default settings are indicated by a
\\
\ mark)
\\
No. Ref. No. Name Function
7 S1 AUDIO 1 600 Z Selects the input impedance of the signal input to the AUDIO 1 connector.
OFF: 20 kZ
\ ON: 600 Z
8 S2 AUDIO 2 600 Z Selects the input impedance of the signal input to the AUDIO 2 connector.
OFF: 20 kZ
\ ON: 600 Z
4 COR1 AUDIO 2 GAIN Selects an input/output gain of the signal input to the AUDIO 2 connector.
(Valid only when COR3 is set to ST.)
+8 dB +4 dB \0 dB _4 dB _8 dB
1 COR2 AUDIO 1 GAIN Selects an input/output gain of the signal input to the AUDIO 1 connector.
+8 dB +4 dB \0 dB _4 dB _8 dB
6 COR3 MONAURAL/STEREO Selects monaural or stereo mode of the analog audio signal input/output.
MO (Monaural): The signal input to the AUDIO 1 connector is distributed to eight outputs
\ ST (Stereo): The each signal input to the AUDIO 1 and AUDIO 2 connectors is distributed to
four outputs
Indicator
No. Ref. No. Name Color Function
3 D1 POWER Green/red Green: A power supply of ±12 V is normal
Red: A power supply of ±12 V is abnormal
Gain adjusting VR
No. Ref. No. Name Function
5 RV3 AUDIO 2 FINE VR Adjusts the gain of the signal input to AUDIO 2 connector within the ±2 dB range.
2 RV4 AUDIO 1 FINE VR Adjusts the gain of the signal input to AUDIO 1 connector within the ±2 dB range.
n
At the factory-out, the gain adjusting VRs were adjusted to 0 dB. (the standard level +4 dBm)
1-2 (E)
BKPF-L753A
1-5. Unleaded Solder
Boards requiring use of unleaded solder are printed with a
lead free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come
printed with the lead free mark due to their particular size.)
: LEAD FREE MARK
m
. Be sure to use the unleaded solder for the printed circuit
board printed with the lead free mark.
. The unleaded solder melts at a temperature about 40 dC
higher than the ordinary solder, therefore, it is recommended to use the soldering iron having a temperature
regulator.
. The ordinary soldering iron can be used but the iron tip
has to be applied to the solder joint for a slightly longer
time. The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful.
1-5. Unleaded Solder
BKPF-L753A
1-3 (E)
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-731 (Part No. A-8322-598-A)
Audio signal generator * Tektronix SG505 (Option-02)
Audio level meter * —
Interface unit Sony PFV-L1 or PFV-L10
Adjustment screwdriver — Insulation type
Resister (600 Z , within 1 %) with lead
*: Use the equipment after calibration has been completed.
2-1-2. Connection
ADA-55 board
Analog audio signal generator
(At CMMR adj.) (At Gain adj.)
+
_
OUTPUTOUTPUT
+
_
COMCOM
Audio level mater
INPUT
+
_
600 Z
Extension board EX-731
PFV-L1/L10 (Rear)PFV-L1/L10 (Side)
BKPF-L753A
AUDIO AUDIO
12
+
_
IN
1
2
3
4
IN
G
OUT
+
_
1
G
+
_
2
G
+
_
3
G
+
_
4
G
L753A
+
_
G
+
_
G
+
_
G
+
_
G
+
_
G
BKPF-L753A
2-1 (E)
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