TCM-900DV - Sony Audio Service Manual (repair manual)

US Model

Canadian Model

AEP Model

Tourist Model

2007A02-1
© 2007.01

Model Name Using Similar Mechanism

NEW

Tape Transport Mechanism Type

MT-900-175

Recording system

2-track 1 channel monaural

Tape speed

4.8 cm/s or 2.4 cm/s

Frequency range

150 - 6 300 Hz using nomal (TYPEI) cassette
 (with REC TIME switc hat “NORMAL”)

Speaker

Approx. 3.6 cm (1 7/16 in.) dia.

Power output

250 mW (at 10 % harmonicdistortion)

Input

Microphone input jack (minijack)
sensitivity 0.12 mV for 3 kilohms or lower impedance
microphone

Output

Earphone jack (minijack) for 8 -300 ohms earphone

Variable range of the tape speed

From approx. +100% to –50% (with
REC TIME switch at “NORMAL”)
From approx. +100% to –30% (with
REC TIME switch at “DOUBLE”)

Variable range of pitch control variation

Approx. +1 octave to –1 octave

Power requirements

3 V DC batteries R6 (AA) x 2
External DC 3 V power sources

Dimensions (w/h/d) (incl. projecting

parts and controls)

Approx. 86.7 x 112.8 x 35.7 mm
(3 1/2 

X

 4 1/2 

X

 1 7/16 in.)

Mass

Approx. 200g (7.1 oz.)

Supplied accessories

Headphones with remote control (1)
R6 (size AA) batteries (2)
   (“Sony World Model” only)
Carrying pouch (1)

Design and specifications are subject
to change without notice.

2

Flexible Circuit Board Repairing
• Keep the temperature of the 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.

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.

This section is extracted from
instruction manual.

Specifications ...........................................................................  1

Location of Parts and Controls .......................................... 2

2-1. Cabinet (Rear), Cassette Lid ASSY ............................ 3
2-2. Main Board ................................................................. 4
2-3. Mechanism Deck ........................................................ 4
2-4. Belt (AR), M601 (Capstan/reel motor),
        HRPE901 (REC/PB/ERASE head) ........................... 5
2-5. SW Board ................................................................... 5

3-1. Mechanical Adjustments ............................................. 6
3-2. Electrical Adjustments ................................................ 6

4-1. Block Diagrams -Main Section (1/2) - ....................... 9
4-2. Block Diagrams -Main Section (2/2) - ..................... 10
4-3. Schematic Diagram - Main Section (1/3) - ................ 11
4-4. Schematic Diagram - Main Section (2/3) - ............... 12
4-5. Schematic Diagram - Main Section (3/3) - ............... 13
4-6.Printed Wiring Boards -Main Section (side A)- ........ 14
4-7.Printed Wiring Boards -Main Section (side B)- ........ 15
4-8.Printed Wiring Boards -SW Section (side A)- ........... 16
4-9.Printed Wiring Boards -SW Section  (side B)- .......... 17
4-10.Schematic Diagram - SW Section - ......................... 18
4-11.Explanation of IC Terminals .................................... 19

5-1. Main Board, Cabinet (Rear) section ......................... 22
5-2. Cassette Lid Section ................................................. 23
5-3. Mechanism deck Section -1(MT-900-175) ............... 24
5-4. Mechanism deck Section -2 (MT-900-175) .............. 25

6. ELECTRICAL PARTS LIST ................................ 26

3

Note : Follow the disassembly procedure in the numerical order given.

• The equipment can be removed using the following procedure.

Cassette lid assy

Cabinet (front)

SW board

Main board

Belt (AR), M601 (Capstan/reel motor),
HRPE901 (REC/PB/ERASE head)

Set

Mechanism deck

Cabinet (Rear)

Note on installing the 
cassette lid assy
Install the cassette lid assy with 
the spring(toggle) as shown in 
the figure so that it fits into the 
holes on the cassette lid assy.

7

8

1

2

5

6

3

4

9

Note on installing the SW flexible board
Insert the SW flexible board as shown
in the figure.

4

5

6

2

1

4

3

1

2