DOWNLOAD Sony BM-23MK2 Service Manual ↓ Size: 2.15 MB | Pages: 30 in PDF or view online for FREE

Model
BM-23MK2
Pages
30
Size
2.15 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
bm-23mk2.pdf
Date

Sony BM-23MK2 Service Manual ▷ View online

SERVICE MANUAL
Sony Corporation
Personal Audio Group
Published by Sony Engineering Corporation
US Model
PORTABLE DICTATOR
9-879-836-01
2005H1678-1
© 2005.08
Ver. 1.0  2005.08
BM-23MK2
Model Name Using Similar Mechanism
NEW
Tape Transport Mechanism Type
MB-23MK2-101
SPECIFICATIONS
2
BM-23MK2
Notes on chip component replacement
Never reuse a disconnected chip component.
Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
Keep the temperature of soldering iron around 270˚C during
repairing.
Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
Be careful not to apply force on the conductor when soldering
or unsoldering.
TABLE OF CONTENTS
1.
SERVICING  NOTES
...............................................
3
2.
GENERAL
...................................................................
4
3.
DISASSEMBLY
3-1.
Disassembly Flow ...........................................................
5
3-2.
Cabinet (Rear) Block Assembly ......................................
6
3-3.
Control Panel Block Assembly ........................................
7
3-4.
AUDIO Board ..................................................................
8
3-5.
Mechanism Deck (MB-23MK2-101) ..............................
9
3-6.
Holder Panel Assembly ...................................................
9
4.
MECHANICAL ADJUSTMENTS
......................... 10
5.
ELECTRICAL ADJUSTMENTS
.......................... 10
6.
DIAGRAMS
6-1.
Block Diagram – AUDIO Section – ................................ 13
6-2.
Printed Wiring Boards ..................................................... 14
6-3.
Schematic Diagram – AUDIO Board (1/4) – .................. 15
6-4.
Schematic Diagram – AUDIO Board (2/4) – .................. 16
6-5.
Schematic Diagram – AUDIO Board (3/4) – .................. 17
6-6.
Schematic Diagram – AUDIO Board (4/4) – .................. 18
6-7.
Schematic Diagram – LCD Board  – ............................... 19
7.
EXPLODED VIEWS
7-1.
Cabinet Section ................................................................ 22
7-2.
Chassis Section ................................................................ 23
7-3.
Mechanism Deck Section-1 (MB-23MK2-101) .............. 24
7-4.
Mechanism Deck Section-2 (MB-23MK2-101) .............. 25
8.
ELECTRICAL PARTS LIST
.................................. 26
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the 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
Unleaded solder has the following characteristics.
Unleaded solder melts at a temperature about 40 
°
C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 
°
C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.
SAFETY-RELATED  COMPONENT  WARNING!!
COMPONENTS  IDENTIFIED  BY  MARK  
0
  OR  DOTTED  LINE
WITH  MARK  
0
  ON  THE  SCHEMATIC  DIAGRAMS  AND  IN
THE  PARTS  LIST  ARE  CRITICAL  TO  SAFE  OPERATION.
REPLACE  THESE  COMPONENTS  WITH  SONY  PARTS  WHOSE
PART  NUMBERS  APPEAR  AS  SHOWN  IN  THIS  MANUAL  OR
IN  SUPPLEMENTS  PUBLISHED  BY  SONY.
3
BM-23MK2
SECTION 1
SERVICING NOTES
This unit use PH501 (photo coupler) to detect reel rotation.
As PH501 is mounted on the AUDIO board, reel rotation will not be detected if the AUDIO board has been removed.
When performing mechanism deck operation and voltage checks whit the AUDIO board removed, perform them using the following method.
Method:
Connect TP32 of the AUDIO board and GND with a jumper wire.
AUDIO BOARD    (SIDE B)
TP32
IC503
PH501
4
BM-23MK2
SECTION 2
GENERAL
This section is extracted
from instruction manual.
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Sony BM-23MK2 Service Manual ▷ Download

  • DOWNLOAD Sony BM-23MK2 Service Manual ↓ Size: 2.15 MB | Pages: 30 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sony BM-23MK2 in PDF for free, which will help you to disassemble, recover, fix and repair Sony BM-23MK2 Audio. Information contained in Sony BM-23MK2 Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.