HHB MDP-500 User Manual

SERVICE
MANUAL

HHB MDP500 PORTABLE MINIDISC RECORDER

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This service manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer. Qualified
technicians have the necessary test equipment and tools, and have been trained to properly and safely repair complex
products such as those covered by this manual.

Improperly performed repairs can adversely affect the safety and reliability of the product and may void the warranty. If
you are not qualified to perform the repair of this product properly and safely, you should not risk trying to do so and
refer the repair to a qualified service technician.

This appliance is classified as a CLASS 1 LASER product, the CLASS 1 LASER product marking is on the rear of the
unit inside the battery compartment.

This equipment fully complies with 21 CFR 1040.10 and 1040.11

CAUTION: Invisible laser radiation when the unit is disassembled, avoid exposure to beam.

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CONTENTS

PORTADISC MDP500 MiniDisc Recorder

SAFETY INFORMATION

1. DISASSEMBLY INSTRUCTIONS . . . . . . . . 5-12

Removing The Top & Bottom Panels . . . . . . . . . . 5-6

Removing The Front Panel . . . . . . . . . . . . . . . . . 7-8

Removing The Main CPU Circuit Board . . . . . . . . . . 9

Removng The MD Mechanism . . . . . . . . . . . . . . 10

Removing The Analog Main & Sub Circuit Boards 11-12

2. BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . 13

3. CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . 15-21

CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Power Supply CPU Board . . . . . . . . . . . . . . . . . . 17

Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Analog Output & Digital Coax I/O . . . . . . . . . . . . . 21

4. PCB LAYOUTS . . . . . . . . . . . . . . . . . . . . 24-33

CPU PCB Component Side . . . . . . . . . . . . . . . . . 24

CPU PCB Solder Side . . . . . . . . . . . . . . . . . . . . . 25

Analog Main Solder Side . . . . . . . . . . . . . . . . . . 28

Analog Main Component Side . . . . . . . . . . . . . . . 29

Analog Sub PCB Solder Side . . . . . . . . . . . . . . . . 32

Analog Sub PCB Component Side . . . . . . . . . . . . 33

Front Panel PCB Parts Side . . . . . . . . . . . . . . . . 35

Front Panel PCB Solder Side . . . . . . . . . . . . . . . . 35

Deck Panel PCB . . . . . . . . . . . . . . . . . . . . . . . . 37

5. RESET INFORMATION . . . . . . . . . . . . . . . . . 39

6. TEST MODE & ALIGNMENT . . . . . . . . . . 41-47

Entering Test Mode . . . . . . . . . . . . . . . . . . . . . . 41

Switch Test Mode . . . . . . . . . . . . . . . . . . . . . . . 41

Mechanism Alignment Test Mode . . . . . . . . . . . . 41

Tools For Alignment . . . . . . . . . . . . . . . . . . . . . . 42

Button Operation During Alignment Test Mode . . . 42

The Alignment Modes . . . . . . . . . . . . . . . . . . . . 42

Test Mode Displays . . . . . . . . . . . . . . . . . . . . . . 43

Temperature Compensation Offset Adjustment . . . 43

Laser Power Adjustment . . . . . . . . . . . . . . . . . . 44

Traverse Adjustment . . . . . . . . . . . . . . . . . . . 44-45

Focus Bias Adjustment . . . . . . . . . . . . . . . . . 45-46

Error Rate Confirmation . . . . . . . . . . . . . . . . . . . 46

Creating A Continuously Recorded Test Disc . . . . . 47

7. IC INFORMATION . . . . . . . . . . . . . . . . . . 49-50

8. PARTS LIST . . . . . . . . . . . . . . . . . . . . . . 51-53

Main Frame . . . . . . . . . . . . . . . . . . . . . . . . 51-52

CPU Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Analog Main Unit . . . . . . . . . . . . . . . . . . . . . . . 53

Analog Sub Unit . . . . . . . . . . . . . . . . . . . . . . . . 53

9. IDENTIFICATION OF PARTS . . . . . . . . . . . 55-58

Top Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Side Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

LCD Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

10. TECHNICAL DATA . . . . . . . . . . . . . . . . . . . 59

CONTENTS

54

DISASSEMBLY INSTRUCTIONS

PORTADISC MDP500 MiniDisc Recorder

Instructions are best carried through in the following order:

a) Slide off the plastic battery cover

b) Remove the 4 screws (A) ~ fig.1

fig.1

c) Remove the 2 screws (B) ~ fig.2

fig.2

Removing The Top And Bottom Panels

DISASSEMBLY INSTRUCTIONS

PORTADISC MDP500 MiniDisc Recorder

6

d) Remove the 2 screws (C) ~ fig.3

fig.3

e) Remove the top panel.

Caution: Disconnect speaker connector (D) before fully separating the top panel

from the machine

~ fig.4

fig.4

f) Remove the bottom panel

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DISASSEMBLY INSTRUCTIONS

PORTADISC MDP500 MiniDisc Recorder

a) Remove the dual concentric record level knob (A) by pushing through from behind the front panel ~ fig.5

b) Remove the phone level knob (B)~ fig.5

fig.5

c) Remove 2 screws (C) ~ fig.6

fig.6

Removing The Front Panel

DISASSEMBLY INSTRUCTIONS

PORTADISC MDP500 MiniDisc Recorder

8

d) Remove 2 screws (D) ~ fig.7

fig.7

e) Lift tab (F) ~ fig.6, then remove the front panel.

Caution: Disconnect ribbon cable (1) before fully separating

the front panel from the machine

~ fig.8

fig.8

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DISASSEMBLY INSTRUCTIONS

PORTADISC MDP500 MiniDisc Recorder

a) Remove 4 screws (A) ~ fig.9

b) Remove the SPDIF optical protector plugs if connected

c) Lift up the CPU board carefully as the board is still attached by several cables

fig.9

d) Disconnect 8 cables (1 - 8) and remove the board ~ fig.10

fig.10

Removing The Main CPU Circuit Board

DISASSEMBLY INSTRUCTIONS

PORTADISC MDP500 MiniDisc Recorder

a) Remove 4 screws (A) ~ fig.11

fig.11

b) Ensure cables (3) and (4) are disconnected ~ fig.10

c) Lift out the MD mechanism

Removing The MD Mechanism

1110

DISASSEMBLY INSTRUCTIONS

PORTADISC MDP500 MiniDisc Recorder

a) Remove 4 screws (A) ~ fig.12

fig.12

b) Disconnect the XLR input cables, (9) and (10) ~ fig.13

c) Remove the Analog Sub pcb

d) Remove 2 screws (B) to remove the metal shield plate ~ fig.12

e) Remove the Record Level Pot locking nut and washer (C) ~ fig.13

f) Disconnect cable, (11) ~ fig.13

g) Remove 3 screws (D) ~ fig.13

Removing The Analog Main & Sub Circuit Boards

12

fig.13

h) Remove 5 screws (E) ~ fig.14

i) Remove the connector side panel (F) ~ fig.14

j) Lift out the Analog Main pcb.

fig.14

DISASSEMBLY INSTRUCTIONS

PORTADISC MDP500 MiniDisc Recorder

13

BLOCK DIAGRAM

PORTADISC MDP500 MiniDisc Recorder

15

CPU

PORTADISC MDP500 MiniDisc Recorder

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POWER SUPPLY CPU BOARD

PORTADISC MDP500 MiniDisc Recorder