SAMSUNG SCR_2438E Service Manual

CD-ROM

CD-ROM DRIVE

S C R - 2 4 38

MANUAL

SERVICE

C D - R O M D R I VE

I N D EX

1. Spec ifica tions

2. Cautions at Service

3. External Part Name

4. Main Components Block Diagram and Pin Des criptions

5. Electrical Parts List

6. Exploded Views

7. Device Part List

8. Disassembly Procedure

9. Troubleshooting

10. Block Diagram

11. Pac king Options

12. Main Board

13. Circuit Diagram

1. Specifications

1. Gen eral Specifications

-Drive Type : Computer Built-in

-Power Consumption : DC+5V,1A

-Dimensions: 128mm(W)¡¿12.7mm(H)¡¿129mm(D)

-Weight: 0.3Kg

2. Elect rical Feature

-Interface : ATAPI BUS(IDE)

-Data transfer Rate : MAX: 3,600KByte/Sec Average: 1,800KByte/Sec

-ACCESS TIME: 1/3 stroke: 170ms or less

Full stroke: 300ms or less

-Buffer Capacity : 128Kbyte

-Error Ratio: Mode 1: Below 10

Mode 2: Below 10

-12

-9

2. Cautions at Service

-Frequency Response : 20Hz~20KHz

-Signal to Noise Ratio : 70dB or more(1KHz, Lineout)Distortion Factor : 0.15£¥or less(1KHz)

-Channel Separation : 60dB or more(1KHz)

-Laser Used: Semiconductor Laser

1.Gen eral Items

1)Be careful not to have eyes or a part of body touch with laser diode when servicing because this product uses laser diode.

2)Do not disassemble Pick-up when servicing. If the laser diode is damaged, re pla ce the entire Mechanism.

3 )Keep away from TV o r other electrical appliances

in other not to ge t influenced by them during servicing.

5) When you insert a disk into disk drive, be sure to load it correctly.

6 )Because this unit can't be used on its own right,

sur ely moun t it on PC(486 or m ore) and check operating condition by using a suitable device d ri ver floopy d iskette. Refe r to instru ctions manual for more information.

7 )This unit consists of many parts whose featu res

can affect on safe ty and importance indicat ed are specially g iven in circuit diagram and part li s t o f cru cial parts. Be ce rtain to use the parts with same specifications when replacing these parts.

2. Earthing when handling Pick-up

- Because the laser d iode in optical Pick-up Ass'y is subj ect to get out of order due to p o tent i a l difference ge ne rated by static electricity charged in clothe s or bodies, observe the following earthing items before servicing.

1) Earthing the static electricity in the body

Be sure to wear a grounding strap with one

side earthed around your wrist.

2) Earthing the Work Table

Place the earthed conductive plate such as

copper plate on the work table.

3)Cautions for clothes

Do not have any clothes touch with Pick-up

because the static electricity in clothes can remain even after grounding

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3. External Parts Name

(1) .Front

(2).Rear

LED

Open Bu tton Emergency

Hole

Interface Terminal

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8. Disassembly Procedure

1. Disassembly the CASE-TOP

1) Take off the 2 screws[1] on the top of the set.

2) Lift up the case top[6].

2. Disassemble thd COVER-DECK and ASSY PANEL FRONT

1) Next to EJECT the set, pull it to the front side and disassemble the 4 screws [2] in the reverse side.

2) Disassemble the COVER-DECK[5].

3) Disassemble the ASS'Y PANEL FRONT[21].

3. Disassemble the ASSY-SUB PCB

1) Dismantle the whole FPC which is assemble in [24] ASSY-SUB PCB.

2) Disassemble ASSY-SUB PCB[24].

4. Disassemble the ASSY-TRAY

1) Disassemble the ASSY BRKT DECK.

2) Push the RAIL-LEFT[4] and disassemble the ASSY CASE BOTTOM.

3) Disassemble the ASSY-TRAY[7].

5. Disassemble the ASSY MAIN PCB

1) Disassemble the FPC-MAIN[22] which is assembled in ASSY MAIN PCB[23].

2) Disassemble the 3 screws and disassemble the ASSY MAIN PCB[23].

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4. Main Components Block Diagram and Pin Descrip tions

¡Ü

KS88C4404 MICROCONTROLLER

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Figure 1-4. KS88C4404 Pin Assignments

¡Ü

BLOCK DIAGRAM KS88C4404

Figure 1-2. KS88C4404 Block Diagram

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¡Ü

OTI 9230 OTI-9230 PIN DESCRIPTIONS

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¡Ü

OTI 9230

Figure 1-3. OTI-9230 Detailed Block Diagram

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OTI 9230

1. PIN-OUT ASSIGNMEN

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OTI-923 0 Pin Descriptions

PIN-OUT ASSIGNMENT(Cont'd)

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OTI-923 0

PIN-OUT ASSIGNMENT(Cont'd)

Pin Descriptions

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OTI-923 0

PIN-OUT ASSIGNMENT(Cont'd)

Pin Types:

PWR

Power

Input TTL

Input Analog

Input CMOS

Input Schmitt Trigger

Input Schmitt Trigger/Pull-Up Resistor

s/pu

Input Schmitt Trigger/Pull-Down Resistor

s/pd

I I

O O

Output

Output Open Drain

Output With Pull-up Resistor

Output Three State

Output with Pull-up Resistor/Three Sate

pu/ts

I/O

Bidirectional TTL With Pull-up Resistor

Programmable-IOL Pins:

Pins with IOL=a are Group-a Programmable-IOL pins, with sink current controlled by register PWR0 bits 5 and 4(microcontroller address B0h). Pins with IOL=b are Group-b Programmable-IOL pins, with sink current cdontrolled by register PWR0 6 (microcontroller address B0h).

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