Service manual

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SERVICE MANUAL

Audio playing system

MiniDisc digital audio system

Laser diode properties

Material: GaAlAs

Wavelength:

λ = 790 nm

Emission duration: continuous

Laser output: less than 44.6 µW

(This output is the value measured at a distance

of 200 mm from the lens surface on the optical

pick-up block with 7 mm aperture.)

Recording and playback time

When using MDW-80:

Maximum 160 min. in monaural

Maximum 320 min. in stereo

Revolutions

350 rpm to 2,800 rpm (CLV)

Error correction

ACIRC (Advanced Cross Interleave Reed

Solomon Code)

Sampling frequency

44.1 kHz

Sampling rate converter

Input: 32 kHz/44.1 kHz/48 kHz

Coding

ATRAC (Adaptive TRansform Acoustic

Coding)

ATRAC3 — LP2

ATRAC3 — LP4

Modulation system

EFM (Eight to Fourteen Modulation)

Number of channels

2 stereo channels

1 monaural channel

Wow and Flutter

Below measurable limit

Inputs

Microphone: stereo mini-jack, minimum input

level 0.25 mV

Line in

: stereo mini-jack, minimum input

level 49 mV

Optical (Digital) in

: optical (digital) mini-jack

Outputs

i/LINE OUT

: stereo mini-jack

headphones/earphones: maximum output

level 5 mW + 5 mW, load impedance 16 ohm

LINE OUT: 194 mV, load impedance 10

kilohm

The LINE IN (OPT) jack is used to connect

either a digital (optical) cable or a line

(analog) cable.

The i/LINE OUT jack connects either

headphones/earphones or a line cable.

Power requirements

Sony AC Power Adaptor connected at the DC

IN 3V jack:

230–240 V AC, 50/60 Hz (UK and Hong

Kong model)

220–230 V AC, 50/60 Hz (European model)

120 V AC, 50 Hz (Canadian model)

240 V AC, 50 Hz (Australian model)

220 V AC, 50 Hz (Chinese model)

110/220 V AC, 60 Hz (Korean model)

100–240 V AC, 50/60 Hz (Other models)

Nickel metal hydride rechargeable battery NH-

14WM

LR6 (size AA) alkaline battery

Battery operation time

Battery life

When recording

(Unit: approx.hours)(EIAJ

)

The battery life may be shorter due to

operating conditions and the temperature of

the location.

When you record, use a fully charged

rechargeable battery. Recording time may

differ according to the alkaline batteries.

Batteries Stereo LP2 LP4

NH-14WM

nickel metal

hydride

rechargeable

battery

8 10.5 13

LR6 (SG)

Sony alkaline

dry battery

71014

NH-14WM

nickel metal

hydride

rechargeable

battery

+ One LR6

(SG)

19 26 30

Frequency response

20 to 20,000 Hz ± 3 dB

120 V AC, 60 Hz (US model)

PORTABLE MINIDISC RECORDER

US Model

Canadian Model

AEP Model

UK Model

E Model

Australian Model

Chinese Model

Tourist Model

SPECIFICATIONS

MZ-R900

US and foreign patents licensed from Dolby

Laboratories Licensing Corporation.

Photo: Red type

– Continued on next page –

Model Name Using Similar Mechanism NEW

Mechanism Type MT-MZR900-171

Optical Pick-up Name LCX-4R

9-927-991-13 Sony Corporation

2001C0500-1 Audio Entertainment Group

C 2001.3 General Engineering Dept.

Ver 1.2 2001. 03

Summary of content (50 pages)

PAGE 1
MZ-R900 SERVICE MANUAL US Model Canadian Model AEP Model UK Model E Model Australian Model Chinese Model Tourist Model Ver 1.2 2001. 03 Photo: Red type US and foreign patents licensed from Dolby Laboratories Licensing Corporation.
PAGE 2
MZ-R900 3) Measured in accordance with the EIAJ(Electronic Industries Association of Japan) standard. 4) When using a 100% fully charged rechargeable battery. 5) When using a Sony LR6 (SG) “STAMINA” alkaline dry battery (produced in Japan). 1. SERVICING NOTES ............................................... 3 2. GENERAL ................................................................... 4 When playing 3. DISASSEMBLY 3-1. 3-2. 3-3. 3-4. 3-5. 3-6. 3-7. 3-8. Disassembly Flow .........................
PAGE 3
MZ-R900 SECTION 1 SERVICING NOTES NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care.
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MZ-R900 SECTION 2 GENERAL Looking at controls This section is extracted from instruction manual. The display window of the recorder See pages in ( ) for more details.
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MZ-R900 SECTION 3 DISASSEMBLY • This set can be disassembled in the order shown below. 3-1. DISASSEMBLY FLOW SET 3-2. PANEL ASSY, BOTTOM 3-3. PANEL ASSY, UPPER SECTION 3-5. MAIN BOARD ASSY 3-6. “CASE ASSY, BATTERY”, “MAIN BOARD” 3-4. “LCD MODULE”, “PANEL ASSY, UPPER” 3-7. STRIP, ORNAMENTAL 3-8. “MD MECHANISM DECK (MT-MZR900-171)”, “CHASSIS ASSY, SET” 3-9. SERVICE ASSY, OP (LCX-4R) 3-10. HOLDER ASSY 3-11. MOTOR FLEXIBLE BOARD 3-12. MOTOR, DC (SLED) (M602) 3-13.
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MZ-R900 3-3. PANEL ASSY, UPPER SECTION 1 flexible board (CN801) 3 two screws (1.4) 4 panel assy, upper section 3 two screws (1.4) 2 Push button (open). 3-4. “LCD MODULE”, “PANEL ASSY, UPPER” 1 four screws (1.7) 2 LCD module 3 button (A), control Note: On installation, adjust the hole of “button (A), control” and boss of “panel assy, upper”. (in the fig. a , b ) 4 button (B), control Note: On installation, adjust the boss of “button (B), control” and hole of “panel assy, upper”. (in the fig.
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MZ-R900 3-5. MAIN BOARD ASSY 6 flexible board (CN501) 7 main board assy 5 1 Remove two solders of flexible board. 3 four screws (M1.4 toothed lock) 4 screw (1.4) 3-6. 2 flexible board (CN502) “CASE ASSY, BATTERY”, “MAIN BOARD” 2 case assy, battery 3 main board 1 Remove the solder of terminal (plus). 1 Remove the solder of terminal (minus).
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MZ-R900 3-7. STRIP, ORNAMENTAL A 5 Remove the “strip, ornamental” in the direction of arrow C. B ) Note: As the “strip, ornamental” is very fragile, do not give an excessive force to the entire assy when removing it. 1 Pull toward the direction A to disengage two bosses a . ) 2 Open toward the direction B to disengage two bosses b and convex portions pointed . with A * ) C ) B 3 three bosses 2 Open toward the direction B to disengage two bosses b and convex portions pointed .
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MZ-R900 3-9. SERVICE ASSY, OP (LCX-4R) 2 gear (SA) 6 screw (M1.4) 1 washer (0.8-2.5) 7 spring, thrust 3 screw (M1.4) 9 Pull off “screw, lead” 4 spring (S), rack 5 screw 8 0 bearing (N) qa Opening the over write head toward the direction A, remove the “service assy, OP (LCX-4R) toward the direction B. B Note: Do not open the entire assy forcibly, when opening the over write head.
PAGE 10
MZ-R900 3-10. HOLDER ASSY 5 Remove the holder assy in the direction of arrow D. B 2 Push the convex portion toward the direction B and open the holder assy toward the direction A to erect uprightly. 1 Open the holder assy. A C 3 Remove the concave portion in the direction of arrow C. D 4 boss 3-11. MOTOR FLEXIBLE BOARD 1 Remove four solders of “motor, DC (sled) (M602)”. 1 Remove two solders of DC motor (over write head up/down) (M603).
PAGE 11
MZ-R900 3-12. MOTOR, DC (SLED) (M602) 1 Remove four solders of motor flexible board. 2 washer (0.8-2.5) 4 two screws (M1.4) 3 gear (SA) 5 motor, DC (sled) (M602) 3-13. “MOTOR, DC (SPINDLE) (M601)”, “MOTOR, DC (OVER WRITE HEAD UP/DOWN) (M603)” 1 Remove six solders of motor flexible board. Note: Press-fit the gear (HA) up to the position of the “motor, DC (over write head up/down) (M603) as shown below. qa motor, DC (over write head up/down) (M603) 6 two screws (M1.
PAGE 12
MZ-R900 SECTION 4 TEST MODE Outline Operation in Setting the Test Mode • This set provides the Overall adjustment mode that allows CD and MO discs to be automatically adjusted when in the test mode. In this overall adjustment mode, the disc is discriminate between CD and MO, and each adjustment is automatically executed in order. If a fault is found, the system displays its location. Also, the manual mode allows each individual adjustment to be automatically adjusted.
PAGE 13
MZ-R900 Configuration of Test Mode [Test Mode $Display Check Mode%] Press the > or [VOL +] key [Manual Mode] Press the x key [Servo Adjustment] [Audio Adjustment] [Power Supply Adjustment] [OP Alignment Adjustment] [VOL +] key:100th place of item number [Major item switching] increase. [VOL --] key:100th place of item number N key x key decrease. [VOL +] key:10th place of item number increase. [Medium item switching] [VOL --] key:10th place of item number N key x key decrease. Press the .
PAGE 14
MZ-R900 5. The display changes a shown below each time the [JOG LEVER $L% R] (up) key or [DISPLAY] key on the remote commander is pressed.
PAGE 15
MZ-R900 • Description of Error Indication Codes Problem Indication code No error Servo system error TOC error Power supply system error Offset system error Meaning of code Simple display Description 00 No error --- No error 01 Illegal access target address was specified Adrs Attempt to access an abnormal address 02 High temperature Temp High temperature 03 Focus error Fcus Disordered focus 04 Spindle error Spdl Abnormal rotation of disc 11 TOC error TOC Faulty TOC contents
PAGE 16
MZ-R900 Sound Skip Check Result Display Mode Key Check Mode This set can display the count of errors that occurred during the recording/playing for checking. This set can check if the set and remote commander function normally. • Setting method of sound skip check result display mode 1. Set the test mode (see page 12). 2. Press the N key or [REC] key, and the playing or recording sound skip result display mode becomes active respectively where the LCD displays the following.
PAGE 17
MZ-R900 SECTION 5 ELECTRICAL ADJUSTMENTS Outline • In this set, automatic adjustment of CD and MO can be performed by entering the test mode (see page 12). However, before starting automatic adjustment, the memory clear, power supply adjustment, and laser power check must be performed in the manual mode. • A key having no particular description in the text, indicates a set key. • For the LCD display, the LCD on the remote commander is shown, but the contents of LCD display on the set are same.
PAGE 18
MZ-R900 7) Select the manual mode of the test mode, and set item number 871 (see page 13). Remote commander LCD display 871 V5num ** **:Adjusted value • Adjustment method of Vc PWM Duty (L) (item number: 762) Remote commander LCD display 762 Vc1PWM ** **: Adjusted value 8) Adjust with the [VOL+] key (adjusted value up) or [VOL--] key (adjusted value down) so that the adjusted value becomes 20. 9) Press the X key to write the adjusted value.
PAGE 19
MZ-R900 2. When press the X key to write the adjusted value, LCD displays as follows and power supply manual adjustment has completed. 7. Press the N key, and set the laser CD read adjustment mode (item number 012). Remote commander LCD display Remote commander LCD display 000 ADJ 012 HrefPw ** OK Adjustment and Connection Location: MAIN board Temperature Correction • Adjustment Method of temperature correction 1. Select the manual mode of test mode, and set the mode number 014 (see page 13). 8.
PAGE 20
MZ-R900 • Overall Adjustment Mode (Title Display) Overall Adjustment Mode • Configuration of overall adjustment Remote commander LCD display Overall adjustment mode . key (Title display) 000 Assy** N key Protect switch ON CD overall adjusting All item OK NG item exists or x key CD overall adjustment NG x key x key Protect switch OFF > key CD overall adjustment OK • Electrical Offset Adjusting Method Caution: The electrical offset adjustment must be made with no disc loaded. 1.
PAGE 21
MZ-R900 • Adjustment Method of Overall CD and MO Adjustment Mode 1. Setting the test mode (see page 12). 2. Press the . or [VOL --] key activates the overall adjustment mode. Remote commander LCD display 000 Assy11 3. Insert CD disc in the set, and press the . key to set the Overall CD Adjustment mode. Automatic adjustments are made. Remote commander LCD display XXX CD RUN XXX: Item number for which an adjustment is being executed. 4.
PAGE 22
MZ-R900 Resume Clear Perform the Resume clear when all adjustments completed. • Resume Clear Setting Method 1. Select the manual mode of the test mode, and set item number 043 (see page 13). Remote commander LCD display 043 Resume CC 7. Press the X key. (0D58 is blinking) Remote commander LCD display 023 0D581E 1E:Adjusted value 8. Press the [VOL+] key once to change the blinking portion to 0D59. Remote commander LCD display 2. Press the X key.
PAGE 23
MZ-R900 20. Press the [VOL+] key once to change the blinking portion to 0D60. Remote commander LCD display 023 0D6000 00:Adjusted value 21. Press the x key. (00 is blinking) 22. Adjust with the [VOL+] key (adjusted value up) or [VOL--] key (adjusted value down) so that the adjusted value becomes 08. Remote commander LCD display 023 0D6008 08:Adjusted value 23. Press the X key. (0D60 is blinking) 24. Press the [VOL+] key once to change the blinking portion to 0D61.
PAGE 24
MZ-R900 8. Press the x key. (00 is blinking) 9. Adjust with the [VOL+] key (adjusted value up) or [VOL--] key (adjusted value down) so that the adjusted value becomes AA. Remote commander LCD display 023 0D5DAA AA:Adjusted value 10. Press the X key. (0D5D is blinking) 11. Press the [VOL+] key once to change the blinking portion to 0D5E. Remote commander LCD display 023 0D5E00 00:Adjusted value 12. Press the x key. (00 is blinking) 13.
PAGE 25
MZ-R900 37. Adjust with the [VOL+] key (adjusted value up) or [VOL--] key (adjusted value down) so that the adjusted value becomes 09. Remote commander LCD display 023 0D6909 09:Adjusted value 38. Press the X key. (0D69 is blinking) 39. Press the [VOL+] key to change the blinking portion to 0D6C. Remote commander LCD display 023 0D6C00 00:Adjusted value 40. Press the x key. (00 is blinking) 41.
PAGE 26
MZ-R900 65. Adjust with the [VOL+] key (adjusted value up) or [VOL--] key (adjusted value down) so that the adjusted value becomes 1C. Remote commander LCD display 023 0D751C 1C:Adjusted value 66. Press the X key. (0D75 is blinking) 67. Press the [VOL+] key once to change the blinking portion to 0D76. Remote commander LCD display 023 0D7600 00:Adjusted value 68. Press the x key. (00 is blinking) 69.
PAGE 27
MZ-R900 SECTION 6 DIAGRAMS BLOCK DIAGRAM – SERVO Section – OVER WRITE HEAD DRIVE IC601 (1/2) M603 OVER WRITE HEAD UP/DOWN RF AMP, FOCUS/TRACKING ERROR AMP IC501 41 38 M HA CLK OUTA OUTB – + – + JY – + – + B – + – + C D – + MON – + IY IX JX JY A B C D RF OUT RF AMP, FOCUS ERROR, TRACKING ERROR PEAK /BOTM 18 PD-NI 37 RFI 29 28 44 PEAK 45 BOTM 41 46 ABCD 42 47 FE 1 ADIP IN 44 56 TE PEAK BOTM ABCD FE TE A-C 13 D-C 7 33 TPP/WPP ADIP 21 PD-I APC 19 VC 31 LD-A LD AUTOMAT
PAGE 28
MZ-R900 6-2.
PAGE 29
MZ-R900 6-3.
PAGE 30
MZ-R900 6-3.
PAGE 31
MZ-R900 6-4. 5 6 7 8 9 11 12 13 15 16 18 19 20 21 22 RECHARGEBLE BATTERY (NICKEL-METAL) NH-14WM 1.2V 1400mAh MOTOR FLEXIBLE BOARD 11 1-679-392- MD MECHANISM S805 SL801(TEST) + C809 R825 R824 C813 R823 R832 C513 C532 C514 C817 C510 C511 C515 C516 A 1 C623 Q601 K D HR601 OVER WRITE HEAD + C631 G S A R622 28 43 C616 29 R601 C610 + R611 C614 C606 1 D601 K C604 A + 30 Q603 1 8 DRY BATTERY SIZE “AA” (IEC DESIGNATION R6) 1PC. 1.
PAGE 32
MZ-R900 6-5. SCHEMATIC DIAGRAM • See page 33 for Waveforms.
PAGE 33
MZ-R900 LIN2 RIN2 13 MUTE BEEP OUT 1 13 12 11 10 8 NOISE AMP 1 COM 54 – + H-BRIDGE CONTROL 3 IC901 VC VG VG VC PRE DRIVER VC 3PHASE CONTROL 15 VM2 2 3 4 5 6 7 8 9 10 11 12 13 14 15 VRECO2 OUTPUT SW VIO VC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 XPC18A32FCR2 42 41 40 39 38 37 36 35 34 33 32 31 30 29 PRE DRIVER 1 SW VIO LEVEL SHIFT H-BRIDGE CONTROL NC 43 VD 44 VC2 45 SERIES PASS REGULATOR VA OUTPUT SW SERIES PASS REGULATOR VD OUTPUT SW OUTPUT SW SERIES PASS
PAGE 34
MZ-R900 LIN2 RIN2 13 MUTE BEEP OUT 1 13 12 11 10 8 NOISE AMP 1 COM 54 – + H-BRIDGE CONTROL 3 IC901 VC VG VG VC PRE DRIVER VC 3PHASE CONTROL 15 VM2 2 3 4 5 6 7 8 9 10 11 12 13 14 15 VRECO2 OUTPUT SW VIO VC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 XPC18A32FCR2 42 41 40 39 38 37 36 35 34 33 32 31 30 29 PRE DRIVER 1 SW VIO LEVEL SHIFT H-BRIDGE CONTROL NC 43 VD 44 VC2 45 SERIES PASS REGULATOR VA OUTPUT SW SERIES PASS REGULATOR VD OUTPUT SW OUTPUT SW SERIES PASS
PAGE 35
MZ-R900 6-6. IC PIN FUNCTION DESCRIPTION • IC501 SN761057DBT (RF AMP, FOCUS/TRACKING ERROR AMP) Pin No.
PAGE 36
MZ-R900 • IC801 CXD2671-202GA (SYSTEM CONTROLLER, DIGITAL SIGNAL PROCESSOR, 16M BIT D-RAM) Pin No. Pin Name I/O Description 1 PAUSE KEY I Set key input terminal (X key input) 2 MIC SENSE O Control signal output to the microphone amp (IC303) normally: “H” “H”: HIGH, “L”: LOW, 3 XTEST I Input terminal for the test mode set up 4, 5 NC O Not used (open) 6 MCUVDD0 — Power supply terminal (for microcomputer block) (+1.
PAGE 37
MZ-R900 Pin No. Pin Name I/O 47 FE I Focus error signal input from RF amp (IC501) 48 AUX1 I Support signal (I3 signal/temperature signal) input terminal (A/D input) Description 49 VC I Middle point voltage (+1.
PAGE 38
MZ-R900 Pin No. Pin Name I/O Description 91 DSPVDD2 — Power supply terminal (for DSP block) (+1.
PAGE 39
MZ-R900 Pin No.
PAGE 40
MZ-R900 Pin No.
PAGE 41
MZ-R900 SECTION 7 EXPLODED VIEWS NOTE: • -XX and -X mean standardized parts, so they may have some difference from the original one. • Color Indication of Appearance Parts Example: KNOB, BALANCE (WHITE) . . . (RED) ↑ ↑ Parts Color Cabinet's Color • Abbreviation CND : Canadian model JEW : Tourist model The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified.
PAGE 42
MZ-R900 7-2. CHASSIS SECTION MT-MZR900-171 51 70 71 53 54 60 52 57 73 72 68 56 53 55 58 not supplied 55 59 62 74 63 61 Ref. No. Part No. Description 51 52 53 54 55 3-220-477-01 X-3379-320-5 4-218-233-07 3-224-089-01 4-218-229-29 SHEET (MD), INSULATING CHASSIS ASSY, SET SCREW (1.4), MI SHEET (TERMINAL), INSULATING SCREW (1.4), MI 56 57 57 3-220-465-03 BUTTON (OPEN) 3-220-464-03 STRIP, ORNAMENTAL (SILVER)...(SILVER) 3-220-464-13 STRIP, ORNAMENTAL (DARK SILVER)...
PAGE 43
MZ-R900 7-3. MD MECHANISM DECK SECTION (MT-MZR900-171) 101 117 119 121 B 118 102 120 105 103 106 118 A A 104 107 108 M603 115 109 122 123 not supplied 110 112 M602 111 M601 115 103 109 B 103 114 113 109 Ref. No. 116 109 Part No. Description 101 102 103 104 105 X-3379-498-1 3-224-779-01 4-218-233-01 X-3379-497-1 4-222-218-01 HOLDER ASSY SPRING, THRUST DETENT SCREW (1.
PAGE 44
MZ-R900 SECTION 8 ELECTRICAL PARTS LIST MAIN NOTE: • Items marked “*” are not stocked since they • Due to standardization, replacements in the are seldom required for routine service. parts list may be different from the parts speciSome delay should be anticipated when orderfied in the diagrams or the components used ing these items. on the set. • SEMICONDUCTORS • -XX and -X mean standardized parts, so they In each case, u: µ, for example: may have some difference from the original uA. . : µA. . uPA. .
PAGE 45
MZ-R900 MAIN Ref. No. Part No. Description Remark C519 1-164-940-11 CERAMIC CHIP 0.0033uF 10% 16V C521 C522 C523 C524 C526 1-125-777-11 1-125-777-11 1-125-837-11 1-117-919-11 1-125-777-11 CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP TANTALUM CHIP CERAMIC CHIP 0.1uF 0.1uF 1uF 10uF 0.1uF 10% 10% 10% 20% 10% 10V 10V 6.3V 6.3V 10V C529 C530 C532 C551 C552 1-125-840-11 1-164-939-11 1-119-923-11 1-125-837-11 1-125-837-11 TANTALUM CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP 10uF 0.0022uF 0.
PAGE 46
MZ-R900 MAIN Ref. No. Part No. Description Remark D602 8-719-081-33 DIODE MA2YD1500LS0 D603 D605 D606 D607 D608 8-719-081-34 8-719-081-34 8-719-081-35 8-719-081-33 8-719-081-35 DIODE DIODE DIODE DIODE DIODE RB160M-30TR RB160M-30TR MA2YD1700LS0 MA2YD1500LS0 MA2YD1700LS0 D801 D901 D902 D903 D904 8-719-056-54 8-719-081-33 8-719-081-33 8-719-420-51 8-719-073-01 DIODE DIODE DIODE DIODE DIODE MAZS068008SO MA2YD1500LS0 MA2YD1500LS0 MA729 MA111- (K8).S0 1-576-439-21 FUSE (SMD) (0.
PAGE 47
MZ-R900 MAIN Ref. No. Part No. Description Remark R606 R607 R608 1-218-949-11 RES-CHIP 1-218-945-11 RES-CHIP 1-218-983-11 RES-CHIP 470 220 330K 5% 5% 5% 1/16W 1/16W 1/16W R609 R610 R611 R613 R619 1-219-724-11 1-218-990-11 1-218-990-11 1-218-957-11 1-218-990-11 METAL CHIP SHORT SHORT RES-CHIP SHORT 1 0 0 2.
PAGE 48
MZ-R900 Ref. No. Part No. 0 1-476-395-11 REMOTE CONTROL UNIT (RM-MC11EL) 1-476-275-11 ADAPTOR, AC (AC-MZR55) (AEP, E13, FR, EE) 0 0 0 0 1-476-277-11 1-476-278-11 1-476-279-11 1-569-007-11 1-756-120-21 Description Remark Ref. No. Part No.
PAGE 49
MZ-R900 MEMO 47
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MZ-R900 REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. 1.2 1.1 1.0 Date 2001.03 2000.12 2000.