Sony Walkman PCM-M1 Service Manual

PCM-M1

SERVICE MANUAL

DIGITAL AUDIO TAPE RECORDER

MICROFILM

Model Name Using Similar Mechanism TCD-D100
Tape Transport Mechanism Type MT-D100-128

t

w

AEP Model

US Model

SPECIFICATIONS

Tape Digital audio tape
Recording time Standard: 120minutes

Long-play mode: 240minutes (with DT-120)

Sampling frequency 48kHz, 44.1kHz, 32kHz
Quantization Standard: 16-bit linear

Long-play mode: 12-bit non linear

Frequency response

Standard: Fs 48kHz 20-22,000Hz (±1.0dB) (LINE IN)

Fs 44.1kHz 20-20,000Hz (±1.0dB) (LINE IN)

Fs 32kHz 20-14,500Hz (±1.0dB) (LINE IN)
Long-play mode: Fs32kHz 20-14,500Hz (±1.0dB) (LINE
IN)

Signal to noise ratio Standard: more than 87dB

Long-play mode: more than 87dB
(1kHz IHF-A, LINE IN)

Dynamic range Standard: more than 87dB

(1kHz IHF-A, LINE IN)

Total harmonic distortion

Standard: less than 0.008% (1kHz, 22kHz LPF, LINE IN)
Long-play mode: less than 0.09% (1kHz, 22kHz LPF,
LINE IN)

Wow and flutter

Below measurable limit (less than ±0.001% W.PEAK)

Input

Output

Input/Output DIGITAL • REMOTE I/O jack (special jack)

Jack type

stereo minijack

Impedance

MIC 4.7kΩ

LINE IN 47kΩ

Rated input level

MIC 1.4mV

LINE IN 500mV

Minimum input level

MIC 0.3mV

LINE IN 120mV

MIC/

LINE IN

Jack type

stereo

minijack

Impedance

220Ω

16Ω

Rated output

500mV

87mV

Minimum output level

–

15mW+15mW

LINE OUT

REMOTE /2

Load impedance

10kΩ

16Ω

Digital input/ output, remote control operation and
timer-activated operation is possible by connection
with an adaptor kit to this jack.

Power requirements • Two R6 (size AA) alkaline batteries (not supplied)

• Two nickel metal hydride rechargeable battery
(Supplied)
DC IN 4.5V jack accepts:

the Sony AC power adaptor AC-E45HG
(Supplied)
the car battery cord DCC-E245 (not supplied)
for use with 12V/24V car battery.

Battery life See “Replacing the batteries” (page 11).
Power consumption 0.9W
Dimension Approx. 80×117.3×29.2mm (3

1

/

4

× 4

5

/

8

× 1

3

/

16

in)

(w/h/d) not incl. projecting parts and controls

Mass Main unit: Approx. 290g (10.3oz)

When using the main unit: Approx. 395g (14oz.)

incl.headphones with remote control, rechargeable
batteries and a cassette

Supplied accessories

• AC power adaptor (1)

• Charger adaptor (1)

• Nickel Metal Hydride Rechargeable battery NH-D100 (2)

• Headphones with a remote control (1)

• DAT cleaning cassette (1)

• Microphone plug adaptor (monaural phone jack × 2→ stereo miniplug) (1)*

• Optical cable (special jack ↔ rectangular-shaped optical input/output) (1)*

• Battery carrying case (1)

• Carrying case (1)
* Supplied only to the European model.
Design and specifications are subject to change without notice.

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TABLE OF CONTENTS

1. GENERAL································································

3

2. DISASSEMBLY

2-1. P ANEL ASSY, LOWER ··················································· 14
2-2. MAIN BOARD ································································14
2-3. LID ASSY , CASSETTE ··················································· 15
2-4. PC BOARD UNIT, SYSTEM CONTROL ······················ 15
2-5. CABINET········································································· 16
2-6. BRACKET ASSY, MD ···················································· 16
2-7. CHASSIS ASSY······························································· 17
2-8. DRUM ASSY ··································································· 17

3. ADJUSTMENTS

3-1. ADJUSTMENTS······························································18
3-2. MECHANICAL ADJUSTMENTS ·································· 23
3-3. ELECTRICAL ADJUSTMENTS ···································· 24

4. DIAGRAM

4-1. BLOCK DIAGRAM – MD SECTION — ······················· 26
4-2. BLOCK DIAGRAM – AUDIO SECTION —················· 29
4-3. IC BLOCK DIAGRAM ··················································· 31
4-4. PRINTED WIRING BOARD ··········································34
4-5. SCHEMATIC DIAGRAM —MAIN SECTION —········· 39
4-6. SCHEMATIC DIAGRAM —AUDIO SECTION — ······ 42
4-7. IC PIN FUNCTION ························································· 45

5. EXPLODED VIEWS

5-1. CABINET SECTION ······················································· 49
5-2. CASSETTE HOLDER SECTION ··································· 50
5-3. MACHANISM SECTION 1 ············································ 51
5-4. MACHANISM SECTION 2 ············································ 52

6. ELECTRICAL PARTS LIST ··································· 53

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.

— 3 —

SECTION 1

GENERAL

This section is extracted
from instruction manual.

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SECTION 2

DISASSEMBLY

2-1. PANEL ASSY, LOWER

2-2. MAIN BOARD

Note: When assembling it, align the slide switch position, and

assemble it.

CABINET BRACKET ASSY, MD CHASSIS ASSY DRUM ASSY

SET PANEL ASSY, LOWER MAIN BOARD LID ASSY, CASSETE PC BOARD UNIT, SYSTEM CONTROL

1 Screw (M1.4 × 2.5)

2

3 Screws (M1.4 × 1.6)

3

Panel assy, lower