Hitachi GCR-8480B Manual de usuario
3
INTRODUCTION
GENERAL FEATURE
SPECIFICATIONS
1. MODEL: GCR-8480B
1) SUPPORTED SYSTEM
• IBM Compatible 486SX or Above (With PIO mode 4 recommended)
2) SUPPORTED OS
3) GENERAL PERFORMANCE
• Data Transfer Rate .........................................................................................Sustained Data Transfer Rate
22Times Speed (Inner side) : 3,300 kbytes/sec
48 Times Speed (max., Outer side) : 7,200 kbytes/sec
• Data Buffer Capacity.....................................................................................................................128 kbytes
• Average Access Time ........................................................................Random Access Time : 75 ms Typical
4) POWER REQUIREMENTS
• Voltage ......................................................................................................................................+5V DC +5%
+12V DC +5%
• Ripple ..................................................................................................................+5V : Less than 100mVp-p
+12V : Less than 100mVp-p
• Current .......................................................................................................................+5V : 0.9A (Maximum)
+12V : 1.5A (Maximum)
5) AUDIO PERFORMANCE
• Frequency Response.....................................................................................................20Hz~20KHz(+3dB)
• S/N Ratio (IHF-A+20 KHz LPF) .......................................................................75 dB (Typical at 1 KHz 0dB)
70 dB (Limit at 1 KHz 0dB)
• T.H.D. (IHF-A+20 KHz LPF) ............................................................................0.05% (Typical at 1 KHz 0dB)
0.15% (Limit at 1 KHz 0dB)
• Channel Separation (IHF-A+20 KHz LPF) .............................................................................75 dB (Typical)
70 dB (Limit)
• Output Level (1kHz 0dB) 47KΩLoad ..................................................................................0.75Vrms + 10%
• Headphone Level (1kHz 0dB) 33ΩLoad...............................................................................0.7Vrms + 20%
• Enhanced IDE interface
• Internal 5.25 inch, halfheight CD-ROM Drive
•
Max 7,200KB/sec Sustained Transfer rate (GCR-8480B)
• Max 7,800KB/sec Sustained Transfer rate (GCR-8520B)
• Photo-CD Multisession Disc Spec compliant
• Multimedia MPC-3 Spec compliant
• Power Tray Loading/Ejection Mechanism
• 3 Way Eject support
(Software, O/C Button, Emergency Eject)
• Closed Enclosure
• Built-in ATAPI Interface Controller
• Software Volume Control
• 8 Times Digital Filter for CD Audio
• Built-in MODE-1 ECC/EDC
• MTBF 125,000h POH (at 10% Utilization)
• PIO Mode 4 & Multi DMA Mode 2 support
• Horizontal or Vertical Mounting
• Digital audio output connector
• Digital audio through ATAPI Interface
• Subcode (P-W) through ATAPI Interface
• Spin-down Mode for energy saving
• MS-DOS Version 3.1 or Higher
• Windows '95/'98/’2000/Me/XP
• Solaris Ver 2.4 or Higher
• Linux slackware Ver 2.3
• Windows NT 4.0 or later
• OS/2 Warp (Ver 3.0)
This service manual provides a variety of service
information. It contains the mechanical structure of
the CD-ROM Drive together with mechanical
adjustments and the electronic circuits in schematic
form. This CD-ROM Drive was manufactured and
assembled under our strict quality control standards
and meets or exceeds industry specifications and
standards.
4
2. MODEL: GCR-8520B
1) SUPPORTED SYSTEM
• IBM Compatible 486SX or Above (With PIO mode 4 recommended)
2) SUPPORTED OS
3) GENERAL PERFORMANCE
• Data Transfer Rate .........................................................................................Sustained Data Transfer Rate
22Times Speed (Inner side) : 3,300 kbytes/sec
52 Times Speed (max., Outer side) : 7,800 kbytes/sec
• Data Buffer Capacity.....................................................................................................................128 kbytes
• Access Time......................................................................Random Access Time(Max 52x) : 80 ms Typical
4) POWER REQUIREMENTS
• Voltage ......................................................................................................................................+5V DC +5%
+12V DC +5%
• Ripple ..................................................................................................................+5V : Less than 100mVp-p
+12V : Less than 100mVp-p
• Current .......................................................................................................................+5V : 0.9A (Maximum)
+12V : 1.5A (Maximum)
5) AUDIO PERFORMANCE
• Frequency Response.....................................................................................................20Hz~20KHz(+3dB)
• S/N Ratio (IHF-A+20 KHz LPF) .......................................................................75 dB (Typical at 1 KHz 0dB)
70 dB (Limit at 1 KHz 0dB)
• T.H.D. (IHF-A+20 KHz LPF) ............................................................................0.05% (Typical at 1 KHz 0dB)
0.15% (Limit at 1 KHz 0dB)
• Channel Separation (IHF-A+20 KHz LPF) .............................................................................75 dB (Typical)
70 dB (Limit)
• Output Level (1kHz 0dB) 47KΩLoad ..................................................................................0.75Vrms + 10%
• Headphone Level (1kHz 0dB) 33ΩLoad...............................................................................0.7Vrms + 20%
• MS-DOS Version 3.1 or Higher
• Windows '95/'98/’2000/Me/XP
• Solaris Ver 2.4 or Higher
• Linux slackware Ver 2.3
• Windows NT 4.0 or later
• OS/2 Warp (Ver 3.0)
2. Trouble List (Circuit)
A. LED doesn’t light.
B. Pick-Up doesn’t move to the inner-track.
C. The Laser of Pick-Up doesn’t light.
D. Pick-Up lens doesn’t move up and down.
E. Disc doesn’t rotate.
F. TOC isn’t read. (The LED turns on, but doesn’t flicker.)
G. During Audio CD Play, LED flickers, but Speaker is silent.
22
TROUBLESHOOTING GUIDE
1. Initial Lead-in Operation
Reset or Power-On.
LED Flickers.
Pick-Up moves to the inner-Track.
Laser on the Pick-Up lights.
Focus Search (through moving up and down the lens of Pick-Up)
Focus Servo On (FEO(TP15) signal generation)
Rotate disc.
Tracking Servo On (TEO(TP14) Signal generation)
Spindle Servo On (SPO(TP25) Signal generation)
Read TOC Area (LED Flickers)
Search the Start of Data Area and then pause.
23
3. Troubleshooting Guide
A. LED doesn’t light.
Check Power Voltage (TP1:3.3V, TP2:12V)
Reference Voltage
[TP3:VC(2.5V) and GND.]
Does “H” output in IC501 pin ?
Check and replace R105, R106, Q12
and LED701 (LED702 for NECCI).
Is the CLOCK Frequency of
IC501 pin ,
33.86MHz?
Check the power input
pattern.
Check IC501.
Check and replace X10;
33.86MHz.
Is the CLOCK Frequency of IC501 pin
33.86MHz?
Check and replace IC501.
YES
OK
NG
YES
YES
NO NO
NO
170
93 94
54
A-1
A-1
24
B. Pick-Up doesn’t move to the inner track.
Do the signals appear at IC501
pin , ?
(Refer to Fig. B-1.)
Do the signals appear in PN301
pin?
(Refer to Fig. B-2.)
Does “H” output at IC201
pin ?
Is the 2.5V at IC201 pin ?
Check the pattern from
IC501 pin to IC201
pin
.
Check IC501.
Replace IC102.
Check the PN301, and then
replace the Sled Motor.
YES
YES
YES
YES
NO
NO
Replace IC201.
NO
NO
34
41
25
35
107
41
CH1
PIN34
DA0
CH2
PIN35
DA1
CH1 TP4
(/A)
(A)
(/B)
(B)
CH2 TP5
CH3 TP6
CH4 TP7
Fig. B-1. DA0 and DA1 Signals Fig. B-2. TP4, TP5, TP6 and TP7 Signals
Check the pattern from
IC501 pin to R42
and then replace IC501.
25
Does “Low” output at IC102
pin ?
Is the voltage of IC102 pin
(LDD) 2V?
Check Pick-Up FFC, PN101.
Check Q10, C10, C32,
R113, R114 and then
replace IC102.
Replace IC501.
YES
YES
NO
NO
13
157
15
Does the focus search signal
appear at FDO (TP9)?
(Refer to Fig. D-1.)
Is the 2.5V at IC201 pin ?
Replace IC102.
YES
YES
YES
NO
NO
Replace IC201.
NO
25
Does the focus search signal
appear between F+ (TP10)
and F- (TP11)?
(Refer to Fig. D-2.)
C. The Laser of Pick-Up doesn’t light.
D. The Pick-UP lens doesn’t move up and down.
D-1
26
Check the pattern from
pin , of IC201 to
pin , of PN101.
Check the PN101, Pick-Up
FFC.
Replace the Pick-Up.
Replace PN101 or Pick-Up
FFC.
OK
OK
NG
34 35
14
CH1
TP9
(FDO)
CH1
TP10(F+)
TP11(F-)
Fig. D-1. FDO Signal Fig. D-2. Focus Search Signal
D-1
27
Does the signal appear at
the SP0 (TP25)?
(Refer to Fig. E-3.)
Do the signals appear at
IC201 pin (W), (V),
and (U)?
Replace IC501.
Replace IC201.
YES
NO
NO
12
14
13
Check the pattern from
IC201 pin , , to
PN201 , , .
YES
OK
12 13 14
13 12 11
Check Spindle Motor FFC
and then replace the
Spindle Motor.
Does the signal appear at
FEO (TP15) when the
IC501 pin opened?
(Refer to Fig. E-1.)
YES
YES YES
NO NO
Replace IC501.
Replace IC501.
Replace Pick-Up.
NO
Do the signal appear at
TP15 (FEO)?
(Refer to Fig. E-2.)
Does the signal appear at
F+(TP10) during focus
search?
E. Disc doesn’t rotate.
144
28
Fig. E-2. FEO Signal
CH1
TP15:
FEO
Fig. E-3. SPO Signal
CH1
TP25:
SPO
Fig. E-1. S-Curve
CH1
TP15:
S-Curve
29
Is the Focus Servo ON?
(Does FEO (TP15) signal
appear?)
Does A, B, C, D signal
appear at IC102 pin ,
?
YES YES
NO
7
8
NO
Is the Tracking Servo ON?
(Does TEO (TP14) signal
appear?)
Does E, F signal appear
at IC102 pin , ?
YES
NO
9
YES
Is TOC area on the disc
read? (Does LED flicker?)
Does the other disc
operate normally?
Normal Disc is defective.
YES YES
NO
10
NO
Does RFI signal appear?
Is Spindle Servo ON?
(Does SP0 signal (TP25)
appear?)
YES YES
NO
NO
NO
Does RFIN signal appear
at IC102 pin ?
6
Replace IC102.
Replace IC102.
Replace IC501.
Replace Main Circuit
Board or MD Ass’y.
NO
Refer to C.
(The Laser of Pick-Up
doesn’t light.)
F. TOC isn’t read.
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