BM-87DST - Sony Audio Service Manual (repair manual)

bm-87dst service manual
Model
BM-87DST
Pages
33
Size
3.69 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
bm-87dst.pdf
Date
Next: Sony SRS-A37 / SRS-A47 Service Manual

Read Sony BM-87DST Service Manual online

BM-87DST
SERVICE MANUAL
DICTATOR/ TRANSCRIBER
SPECIFICATIONS
US Model
Australian Model
Model Name Using Similar Machanism
NEW
Tape Transport Mechanism Type
MB-87-59
Ver 1.1  2003.06
9-927-638-12
2003F02-1
© 2003.06
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
– 2 –
Specifications ...........................................................................  1
1. SERVICING NOTE
....................................................... 2
2. GENERAL
Features .............................................................................. 3
Precautions ......................................................................... 3
Operation Flow Chart ........................................................ 4
Location and Function of Controls .................................... 5
Preparation ......................................................................... 6
Dictating ............................................................................. 7
Transcribing ....................................................................... 9
Erasing ............................................................................. 11
Alarm System .................................................................. 12
Telephone Recording ....................................................... 12
3. DISASSEMBLY
3-1. Cabinet (Rear) Assy , Cabinet (Front) ASSY ........... 13
3-2. Main Board, Connecter (12P) Board ........................ 13
3-3. LED Board ................................................................ 14
3-4. Mechanism Deck ...................................................... 14
3-5. Servo Board, “Head Magnetic (REC/PB/Erase)
        (HRP901)”, Motor (F/R) ASSY (M902) .................. 15
3-6. Belt (FWD), Belt (F/R) ............................................. 15
3-7. Motor (FWD) ASSY(M901) .................................... 16
4. MECHANICAL ADJUSTMENTS
.......................... 17
5. ELECTRICAL ADJUSTMENTS
............................ 18
6. DIAGRAMS
6-1. Explanation of IC Terminals ..................................... 19
6-2. Block Diagram .......................................................... 21
6-3. Printed Wiring Boards (Servo Section) .................... 23
6-4. Schematic Diagram (Servo Section) ......................... 25
6-5. Printed Wiring Boards (Main Section) ..................... 28
6-6. Schematic Diagram (Main Section) ......................... 31
7. EXPLODED VIEWS
7-1. Cabinet Section ......................................................... 35
7-2. Mechanism Deck Section (1) (MB-87-59) ............... 36
7-3. Mechanism Deck Section (2) (MB-87-59) ............... 37
8. ELECTRICAL PARTS LIST
.............................
38
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.
TABLE OF CONTENTS
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
SECTION 1
SERVICING NOTE
NOTES FOR REPAIRING
1. POWER (S101) Switch
The POWER switch is not for turning ON/OFF the power
source. Pay attention when repairing even the POWER
switch is turned off.
• The states when turning off the POWER switch are as
follows.
a. Motors (M901, 902) will be stopped.
b. Plungers (PM901 to 903) will be turned off.
c. Amplifier output will be cut-off by muting on.
The above items from “a” to “c” are controlled by the
microcomputer which makes the pin 38 of IC109
(microcomputer) become Low level.
2. Be careful the short circuit when repairing since the power
supply circuit does not have any protection devices.
Please note that the current shut down (D108) will be work
when the power connected to the opposite way.
3. Crack of Flywheel Gear and Cam Gear
Do not turn the Flywheel counterclockwise.
The flywheel gear and cam gear may be crack when turn the
flywheel counterclockwise.
cam gear 
motor (FWD) (M901)
flywheel
– 3 –
SECTION 2
GENERAL
This section is e
xtr
acted from
instr
uction man
ual.
– 4 –
Page of 33
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Download Sony BM-87DST Service Manual (Repair Manual)

Here you can read online and download Sony BM-87DST Service Manual in PDF. BM-87DST service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony BM-87DST Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.

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