Sony Cyber-shot DSC-S75 Installation guide

Training Manual
Course: DSC-02
Digital Still Camera Servicing
Models: DSC-S75
DSC-S85
DSC-F707
Circuit Descriptions and Troubleshooting
DSC-F707
DSC-S75 DSC-S85

Table of Contents
1.Overview .............................................1
Symbol Explanations............................................ 1
2.Software-AllModels .......................2
PTP ......................................................................... 2
DSC-S75 and DSC-S85
3.DSC-S75&DSC-S85Digital
Cameras .................................................3
Overview................................................................. 3
Repair Tools & Jigs............................................... 3
Alignment ............................................................... 4
Radar W and RM-85 ............................................ 5
4.BlockDiagram...................................6
Overview................................................................. 6
Operation................................................................ 6
SY-68 Board T roubleshooting............................ 6
5.PowerSupply ....................................9
BoardAccess......................................................... 9
Circuit Operation................................................... 9
Unregulated always ON voltages ...................... 11
V REF .................................................................... 11
DC IN - Battery Switching ................................... 11
Power Supply Troubleshooting .......................... 13
6.FlashAssembly ................................14
7. Video Processing.............................15
8.LensAssembly .................................16
Operation............................................................... 16
Troubleshooting.................................................... 18
9.CameraSwitches .............................20
Overview................................................................ 20
Troubleshooting.................................................... 20
DSC-F707
10. Features ..........................................22
11.RepairTools&Jigs........................23
12.Alignment........................................24
Radar W and RM-85 ........................................... 24
When to Align....................................................... 25
13.BlockDiagram................................26
Lens Assembly ..................................................... 26
Camera Control.................................................... 27
Audio and Vidceo................................................. 27
Flash ...................................................................... 27
14.LensAssembly ...............................28
Overview................................................................ 28
Circuit Description................................................ 29
Iris........................................................................... 30
Servicing................................................................ 32
Focus Ring Repairs ............................................. 34
15.PowerSupply .................................35
Converter Operation............................................ 36
SCP........................................................................ 37
Troubleshooting.................................................... 38
Discharging Storage Capacitors........................ 39
Checking FR-181 Board ..................................... 39
16.FlashCircuit ...................................40
Overview................................................................ 40
Operation............................................................... 40
Servicing................................................................ 41
Procedure.............................................................. 42
Blue Flash............................................................. 42
17. Jigging Camera..............................43
18. Camera Switches...........................44
Overview................................................................ 44
Troubleshooting.................................................... 44

1
9. Self-Diagnostics & Screen Display (DA4 & DA-4X Chassis)
Chapter 1 - Overview
MSRP 999.95 599.95 499.95
Imager (Gross) 1/1.2" 5.2MP Super
MAD CCD 1/1.8" 4.1MP CCD 1/1.8" 3.3MP CCD
Effective Pixels 5.0 Megapixel 4.0 Megapixel 3.3 Megapixel
Optical/Digital Zoom 5X / 2X / 10X 3X / 2X / 6X 3X / 2X / 6X
Carl Zeiss Lens Yes Yes Yes
Lens Thread 58mm 52mm w/adapter 52mm w/adapter
Manual Focus Yes, Continuous Ring Yes, 13 Step Yes, 13 Step
A/D Conversion 14-bit DXP 14-bit DXP 14-bit DXP
AF Illuminator Hologram AF Yes, On/Off Select Yes, On/Off Select
Flash Modes Auto/Forced/Off Auto/Forced/Off Auto/Forced/Off
Red-eye Reduction On/Off On/Off On/Off
LCD/Viewfinder 1.8" 123K Pixel 1.8" 123K Pixel 1.8" 123K Pixel
LCD Backlight On/Off, adjustable On/Off adjustable On/Off adjustable
Recording Media Memory Stick only Memory Stick only Memory Stick only
Still Image Formats JPEG, GIF, TIFF JPEG, GIF, TIFF JPEG, GIF, TIFF
E-mail Mode Yes, adds 320x240 Yes, adds 320x240 Yes, adds 320x240
Movie Modes MPEG EX/HQ MPEG EX/HQ MPEG EX/HQ
Supplied Storage Media 16MB Memory Stick 16MB Memory Stick 8MB Memory Stick
Connections Video/USB/AC Power Video/USB/AC Power Video/USB/AC Power
Dimensions 6-5/6 x 4-7/8 x 2-5/8" 4-15/16 x 2 x 2-9/16" 4-15/16 x 2 x 2-9/16"
Weight 1 lb, 6.4 oz (635g) 15.2 oz (423g) 15.2 oz (423g)
Warranty Terms 1 Year parts, 90 days
labor 1 Year parts, 90 days labor 1 Year parts, 90 days labor
The DSC-S75, DSC-S85 and DSC-F707 cameras are high quality ‘high–end’ cameras with many features,
including Carl Zeiss lenses, multi-step and continuous focus, optical and digital zoom, low light auto focus
illumination, USB connectivity, JPEG, GIF and TIFF picture formats, burst and bracketed still modes and a
MPEG movie mode. The camera specifications are shown in the table:
SymbolExplanations
The following symbols used in this manual:
?This symbol in front of a paragraph indicates a helpful service tip or step
NThe upraised arm symbol indicates a momentary halt to a process or procedure and evaluate if it is done
correctly
XThis indicates a caution or warning

2
9. Self-Diagnostics & Screen Display (DA4 & DA-4X Chassis)
Chapter 2 - Software - All Models
All current model Sony still cameras are packaged with a CD containing a USB driver for interfacing with USB
computer ports and a number of video editing programs:
•Two versions of MGI PhotoSuite, a still video editing and album creating application: Version 8.1 for Windows
operating systems and version 1.1 for Mac operating systems
•Also included is MGI Video Wave III, an entry-level motion video editing system.
•As of this writing, the supplied USB camera driver is version SVP-004. Tables 2-1 and 2-2 list the driver
compatibility with Macintosh and Windows operating systems.
Table 2-1 -Windows Operating
Systems Table 2-2 -Mac Operating Systems
OS Version Status OS Version Status
3.1 X7.1.2 X
95 X7.5 X
98 OK 7.6.1 X
98SE OK 8.0 X
ME OK 8.1 X
NT3.5.1 X8.5 X
NT4.0 X8.5.1 OK
2000 PRO OK 8.6OK
XP PRO OK* 9.0 OK
CE X9.1 OK
X (10) OK*
*Driver not needed. Already built into
OS
X= Not Compatible
The SVP-004 USB device driver is included as an accessory with each camera. It can be downloaded from the
Sony web support site at:
http://www.ita.sel.sony.com/support/dvimag/cybershot/
PTP(PictureTransferProtocol)
•Picture data is transferred from the camera to a computer via the USB port using PTP (Picture Transfer
Protocol).
•PTP is an open standards protocol for transferring pictures from digital cameras to computers using the USB
port
•PTP protocol allows the camera to be seen by the computer as a mass storage device. When connected to
a computer, the computer will see the picture files in the camera as data files.
•PTP allows only picture objects to be seen and transferred between the camera and the computer. When the
memory stick is installed in the camera, non picture files that are stored on the memory stick will not be seen
by the computer.
•PTP works only with Windows XP. It is not supported by any earlier operating system.

3
3. DSC-S75 and DSC-S85 Digital Cameras
Chapter 3 - DSC-S75 and DSC-S85 Digital Cameras
Overview
The DSC-S75 and S85 Cyber-shot®digital cameras are very similar in appearance and operation. The circuit
descriptions and repair procedures are also very similar and apply equally to both models. The differences are
in the body colors (S85 is black and S75 is silver), the number of CCD pixels and the price. The S75 is supplied
with an 8 MB Memory Stick ™ and the S85 with a 16 MB memory stick.
DSC-S75
RepairToolsandJigs
Repairing these digital cameras requires the following specialized tools and jigs. See Table 3-1 below:
Table 3-1 –Repair Tools and Jigs
Jig or Tool Vendor
NTSC color monitor Your choice
Vectorscope Your choice
Radar W jig J-6082-429-A
Radar Jig Software Available Online at
http://service.sel.sony.com/
Computer to run Radar W software Must have USB & bi-direction parallel
printer port
RM-95 Adjusting Remote Commander J-6082-053-B
CPC 9 interface jig See note 1.J-6082-393-C See note 1.
Light box with focus and color bar patterns Your choice
Tripod Your choice
Tool to discharge flash capacitor Made with 1000 ohm 1 watt resistor
Note 1: Do not use earlier version of CPC-9 interface jigs. Use only -393-
C version.
Earlier versions will damage the SY-68 board. The version and part numbers are silk
screened on the CPC-9 jigs.
DSC-S85

4
3. DSC-S75 and DSC-S85 Digital Cameras
Alignment
When to Align
Cameras will need alignment when one of the following components is replaced:
•SY-68 board
•Lensassembly
•Flash
•LCD display
•LCD character display
Table 3-2 shows the areas that will need realignment when one of the above components is replaced.
INITIALIZATION OF D PAGE DATA
INITIALIZATION OF 7,9,B,E,F PAGE DATA
VIDEO SYNC LEVEL ADJ.
VIDEO BURST LEVEL ADJ.
FLANGE BACK ADJ.
F No. STANDARD DATA INPUT
MECHANICAL SHUTTER ADJ.
LIGHT LEVEL ADJ.
MIXED COLOR CANCEL ADJ.
AUTO WHITE BALANCE STANDARD DATA INPUT
AUTO WHIT BALANCE ADJ.
COLOR REPRODUCTION ADJ.
CCD (WHITE AND BLACK0 DEFECT COMPENSATION
STROBE WHITE BALANCE ADJ.
LCD INITIAL DATA INPUT
LCD VCO ADJ.
LCD D RANGE ADJ.
LCD BRIGHT ADJ.
LCD CONTRAST ADJ.
LCD COLOR ADJ.
LCD V-COM LEVEL ADJ.
LCD V-COM ADJ.
LCD WHITE BALANCE ADJ
FLASH
LCD
BACKLITE
LCD
DISPLAY
LENS
SY-68
BOARD
Table 3-2 - Adjustment Table

5
3. DSC-S75 and DSC-S85 Digital Cameras
FROM
CAMERA
1
+-
CPC-9 JIG
J-6082-393-C
ADJUSTING
REMOTE
COMMANDER
RM-95
INTERFACE UNIT
J-6082-429-A
INTERFACING RM-95 OR RADAR W JIG
TO
COMPUTER
PARALLEL
PORT
REPLACE RM-95 PLUG
WITH INTERFACE
UNIT PLUG
RadarWandRM-95
Alignments should be done with the RADAR W interface jig and associated software. They can also be done
with the Adjustment RM-95 remote control jig, but RADAR W is an order of magnitudes faster than the Service
RM-95, and unlike the RM-95, it is less prone to data entry mistakes.
The Sony part number for the Radar W interface jig is J-6082-429-A.
The RM-95 jig should be reserved for making small registry changes or for checking the operation of the camera
switches.
The diagrams show how to interconnect the interface jig between the camera and the RM-95 or the Radar W jig.

6
4. DSC-75 and DSC-S85 Block Diagram
Chapter 4 - DSC-S75 and DSC-S85 Block Diagram
The following is a short explanation of the internal camera operations in block diagram format, based on the SY-
68 board as the central item.
Overview
Refer to Figure 4-1. Most of the camera functions are concentrated on SY-68 board, including interfaces for
external switches, controls and I/O interfaces to the outside world. The power supply is on the DM-101 board.
Operation
Thecameraiscontrolledbythreeprocessors:CAMERADSPIC301,FRONTCONTROLIC402andMCCAMERA
SH DSP IC501. The video to the LCD panel and a power supply DC CONTROL IC.
•The CAMERA DSP converts the light image falling on the CCD into video signals for the LCD monitor and A/
V jack and into digital video data for the memory stick and USB port.
•The Front Control IC acts as an I/O interface. It processes all input commands from the camera switches
dials and sensors, controls the flash charging and generates the characters for the LCD monitor panel and
the LCD readout display.
•TheMCCameraSHDSPICcontrolsthedigitaldatatotheLCDmonitorpanel(thevideosignalsarecontrolled
by the Camera DSP) and the USB I/O.
•The DC Control IC controls all of the regulated power supply outputs from the DM-101 board.
Accessory jack J782 interfaces with the camera LANC data and is also used for triggering an external flash.
CN753 is the Memory Stick™ socket
SY-68BoardTroubleshooting
The SY-68 board is not a repairable item. If defective, it should be replaced and the old board returned for core
credit, as per Sony policy.
The board, together with the lens assembly, is easily removable once the back cover is taken off. They are held
in place by just five easily visible screws; no further explanation is necessary.
NThe camera must be fully aligned after the board is replaced. This includes flange back adjustment. To
reduce the alignment time, whenever possible use Radar W to upload and save the data from the original SY
board to the computer then download it back into the new board.
?If camera is intermittent, check the SY board for flatness. Replace if it is slightly bowed along its long axis.
?After replacing a SY-68 board, the camera may display Japanese characters. Use the Service RM-95 to
change the display to English. Change the data in page D, address 4F, to 04 (do not forget to disable write
protectbefore writing andtopress Pause afterwriting). You can also use this method if the userinadvertently
changes the display to another language.

7
4. DSC-75 and DSC-S85 Block Diagram
M
SENSOR
IMAGER
PROCESS
M
SENSOR
MSHUTTER
DRIVE
FOCUS
IC301
CAMERA
DSP
ZOOM
MOTOR
DRIVE
FLASH
VIDEO
AMP
JK-211
BOARD
IC501
MC
CAMERA
SH DSP
C
AUDIO
PROC.
& AMP.
LCD
DRIVE
DM-101
BOARD
CK-103 BOARD
BACK
LIGHT
JK-211BD.
JK-211BOARD
Y
V
J782
ACC
Z SENS RST
FSENS RST
STRB ON
STRB AIN
STB CHARGE
XSTB FULL
CN753
MEMORY
STICK
SOCKET
USB
USB D+
USB D-
VIDEO OUT
AUDIO OUT
SPEAKER
MIC.
COLOR
LCD
MON.
LCD901
AV OUT
VR
VG
VB
EXT STRB ON
LANC SIG.
LANC DC
CLK
FOCUS
MOTOR
DRIVE
TO/FROM FRONT CONTROL IC
IC001
DC CONT.
SY-68 BD.
ZOOM IRIS
FIGURE 4-1 - OVERALL BLOCK DIAGRAM A 4.1DSC02a 1483 10/10/02

8
4. DSC-75 and DSC-S85 Block Diagram
JK-211
BOARD
IC402
FRONT
CONTROL
INITIAL
RESET
BACK-UP
IC001
DC
CONT.
+
S
-
D1.8V
D3.2V
CAM 3.2V
A 3.2V
CAM P 5V
A 4.9V
P 4.9V
10.05V
15.05V
-10.05V
PANEL-15.3V
CAM -7.5V
POWER
ON/OFF
LITHIUM
BATT.
SHUTTER
SWITCH
MODE
DIAL
ZOOM
SWITCH
CK-103
BOARD FUNCTION
KEY
KY-55 BOARD
LCD
CHARACTER DISP.
JOG DIAL
BATT.
TERM. BATT. SIG.
VL 3V
DC IN
SYSDD ON
COM 0-3
SEG 0-19
KEY AD3
DIAL A,B
CONTROL SW.
BLOCK ZOOM
KEY AD 0-2
CONTROL SW.
BLOCK (MODE)
FIGURE 4-2 - OVERALL BLOCK DIAGRAM B
DM-101 BD.
ACV UNREG
ST UNREG
BATT.UNREG
TO/FROM
MC CAMERA
SH DSP
TO/FROM
CAMERA
DSP
TO/ FROM
FLASH UNIT &
LANC
ACC
4.2DSC02b 1483
10/10/02
SY-68 BOARD

9
5. DSC-S75 and DSC-S85 Power Supply
Chapter 5 - DSC-S75 and DSC-S85 Power Supply
The DM-101 Power Supply board converts the dc input from the ac adapter or battery into all of the necessary ac
and ±dc voltages.
BoardAccess
TheDM-101boardissandwichedbetween theSY-68boardand thefrontofthe cameraandisnot easilyaccessible
for live troubleshooting.
The output and control lines to the board can be checked at CN701 on the SY-68 board when the camera back
is removed. Although the camera will not operate properly with the back removed, the power supply will power
up. The picture shows the location of CN701 on the SY-68 board.
CircuitOperation
Figure 5-1 shows a block diagram of the power supply board. Due to limited access, “live” troubleshooting is
limited to the CN701 connector on the SY-68 board. Therefore, the circuit description of the DM-101 board
will be limited to a block diagram.
With the exception of an unregulated always-on voltage and an unregulated battery voltage, all voltages are
produced by discrete switching circuits on the board. The switching circuits are controlled and regulated by
DC Control IC001, which provides the switching signals and feedback control to the switching transistors.

10
5. DSC-S75 and DSC-S85 Power Supply
J001
DC IN
IC001
DC
CONTROL
+
S
-
CAM
-7.5V
BT902
BATT.
TERMINAL
F005
F004
F003
F001
F002
SYS DD ON
SCP
BATT SIG
INIT CH. ON
FAST CH.
BATT. /XEXT
CAM 3.2V
CN001
CN002
BATT
SIG.
D003
1
3
2
1
2
3
A 3.2V
D 3.2V
SYS
DD ON
SCP
Q002
FAST
CH.
Q003,004
INIT.
CH.
V. REF.
15
39
35
28
29
12
14
26
27
23
25
11
16
7
31
8
10
30
32
40
36
37
38
D 1.8V
BL VO-
ON/OFF
PANEL
-15.3V
10V
15V
A 4.9V
-10.5V
FIGURE 5-1 - POWER SUPPLY BLOCK DIAGRAM
31
7
11
17
18
32
34
19
20
21
23
35
30
39
15
36
38
16
14
6
10
9
8
P4.9V
CN701
VCC-D 33
34 17 13
Q009
3.2V CAM
SW. REG.
VCC-B VCC-C
VCC-A
Q007
CAM
SW. REG.
Q005
+10V
+15V
-10.5V
19
18
17
27
28
29
Q011,
Q012
1.8B
SW. REG.
Q070.
Q076
-15V
SW. REG.
Q008
BACK
LIGHT
-VOL
V. REF.
V. REF.
VCC-D
VCC-B
VCC-B
VCC-A
FB
4.9V
SW
SW
SW
SW
SW
FB
FB
SY-68 BD.
SW
FB
ALWAYS ON
BATT. ON
1DSC02 1479 10/11/02
MD-101
BOARD

11
5. DSC-S75 and DSC-S85 Power Supply
Q005
SW.
PRI
4.9V FROM
Q007
VCC-B
FROM
IC001
-10.5V
+15V
+10V
+
+
+
FIGURE 5-2 - +10V, +15V,-10.5V DIAGRAM 9DSC02 1493 9/26/02
UnregulatedalwaysONvoltages
The always-on voltage is fed to all
circuitsviafourfuses? F1 ~ F4. Each
fuse supplies a different section of
IC001 and its respective external
switchingcircuit.
+10V,+15V, -10V Supplies
The circuit supplying these voltages
is unique: one of the secondary
windings is in series with the +4.9V
output from Q007. See Figure 5-2. It
operates as follows:
1. The primary winding of the
transformer is switched by Q005
to provide an ac voltage to the
primary. Q005 is powered by Vcc-B.
2. The turn ratio of the secondary +10V and +15V winding can provide only +5V and +10V. To get the additional
5 volts, the common leg of the secondary winding is not connected to ground but to the +4.9V line from Q007.
This causes the output from this secondary winding to increase by 4.9V.
V REF
This output line from Control IC001 provides a very stable 1.5 reference voltage to many of the voltage regulators
in the power supply.
DCIN– BatterySwitching
ACAdapterConnected
See Figure 5-1.
•The ac adapter directly supplies the camera with power when it is connected. Q002 provides a fast charge
(initial charge) to the battery if the battery charge is low.
•Q003, Q004 and D003 charges the battery with a slow initial charge (current limiting)
•Once the battery has charged up a little, switch Q003 / Q004 opens and Q002 closes. This provides the
battery with a faster charge.
•When the battery has fully charged, switch Q002 opens and the battery is isolated from the ac adapter
power.
AC adapter Not Connected
See Figure 5-1.
•The battery supplies power to fuses F001 ~ F004 via switch Q003/Q004 and D003.

12
5. DSC-S75 and DSC-S85 Power Supply
FIGURE 5-3 - SAFETY SHUTDOWN CIRCUIT (SCP) 2DSC02 1480 10/11/02
13
30
29
63
42
51
28
64
50
VCC
56
4
F004
F003
F001
F002
SYS DD ON
SCP
IC001
DC
CONTROL
SYS
DD ON
SCP
VCC
VCC
VCC
SC
TL1
SC
TL2
OUT
15V
-10.5V
Q062, 063
EMERGENCY
DETECT
SCP
SYS DD ON
15V
-10.5V
CAM 15V
DC BATT./
ADAPTER
INPUT
SY-68 BOARD 1/2
DM-101
BOARD (1/2)
18
17
30
32
28
29
16
14
PULSE
OUTPUTS
Control Circuits
See Figure 5-1
The control lines for this power supply are:
SYS DD ON
This is the master switch that turns the DC Control IC ON/OFF. The line must be HIGH (3.2v) for the IC to
operate. It is controlled by the SY-68 board.
SCP (Short Circuit Protection)
See Figure 5-3
This is the short circuit protection line. The SY-68 board monitors the -10.5V and +15 volt lines and will output
a LOW on the SCP line if the voltages it monitors drops to -8.5 volts and +12 volts, respectively.

13
5. DSC-S75 and DSC-S85 Power Supply
PowerSupplyTroubleshooting
NDo not repair any of the printed circuit boards on units under warranty. If defective, order a new one and send
the old one back for a refund of the core charge, as per Sony policy.
Troubleshooting the DM-101 power supply board is limited to checking the output voltage levels and control
signal lines on SY-68 connector CN701 and to checking fuses and other components with the board removed.
•If the camera is dead, the most important voltage to check is the always-on voltage from fuse F004. See
Figure 5-1. Since this fuse provides always-on power to the SY-68 board, that board will not be able to
provide a HIGH to the SYS DD ON line and the power supply will not turn on.
Failure to diagnose this fuse can prevent the technician from determining which board is defective.
Replace the DM-101 board if this fuse is open after first making sure that there is not a short in the SY-68
board that is blowing the fuse.
•If the lack of a particular output voltage is traced to a blown fuse, make sure to also check the switching
transistors that it feeds for a short.
?A common complaint of the battery not charging or unit not running from ac adaptor is caused by a physically
damaged ac adapter jack. Check this jack before replacing the battery or ac adapter. It is easily lifted out
once the back cover is removed. The part number is for the jack is 1-7940-456-1. See Figure 5-4.
Figure 5-4

14
6. DSC-S75 and DSC-S85 Flash Assembly
Chapter 6 - DSC-S75 and DSC-S85 Flash Assembly
DISCHARGE
RESISTOR
(HOLD FOR
10 SECONDS)
1k
1
W
Figure 6-1 - Flash Assembly
The flash assembly is considered a replaceable module so its internal operation is not discussed. Its mode of
operation is rather simple:
In addition to unregulated B+ input and ground (not shown), it has five control lines to and from the SY-68 board:
STB CHARGE, XSTB FULL, STRB ON, PHOTO TR OUT (STRB AIN) and STRB PHOTO ON.
1. STB CHARGE. A HIGH (3V) on this line from the SY-
68 board turns on the storage capacitor charge circuit.
Charging stops when the line goes LOW.
2. XSTB FULL. Outputs a LOW pulse from the flash
assembly to the SY-68 board when the storage
capacitorischargedup. TheSY-68boardthenswitches
theSTBCHARGElineLOW,turningofftheflashcharge
circuit.
3. STRB ON. A HIGH pulse on this line from the SY-68 board fires the flash. The on time of the flash is
proportional to this pulse width.
4. PHOTO TR OUT (also called STRB AIN). This is an output from a phototransistor located in the front of the
camera that feeds back the intensity of the flash reflected back from the scene to the SY-68 board. When
sufficient light has reached the subject, the STRB_ON line goes low and the flash turns off. The voltage level
on the STRB_AIN line depends on the amount of light reflecting to the camera. Maximum level is 3V with no
light falling on the phototransistor.
5. STRB PHOTO ON. This line enables the phototransistor. It goes HIGH when the shutter is pressed and
goes LOW after the picture has been taken.
CAUTION – SHOCK HAZARD
XCapacitor will charge up when the camera is turned on. Never touch
any exposed part of the flash assembly without first discharging the
storage capacitor. Use a 1K 1W resistor to discharge the capacitor.
Troubleshooting
Failure to flash can be caused either by the flash assembly or by the SY-
68board. Since “live” diagnosis is not practical, an educated guess must
be made to determine if the problem is with the flash assembly or with
the SY-68 board.
?The flash assembly may be defective if error code E:91:01 appears
in the display when taking a flash picture.
?The flash assembly should be replaced before replacing the SY-68 board if the problem fault cannot be
determined. Experience has shown that the flash unit is more likely to be defective than the SY-68 board. It
is also much less complicated to replace (no need for extensive alignment) and is also lower in cost.

15
7. DSC-S75 and DSC-S85 Video Processing
Chapter 7 - DSC-S75 and DSC-S85 Video Processing
M
SENSOR
IMAGER
PROCESS
M
SENSOR
MSHUTTER
DRIVE
FOCUS
IC301
CAMERA
DSP
ZOOM
MOTOR
DRIVE
VIDEO
AMP
IC501
MC
CAMERA
SH DSP
C
AUDIO
PROC.
& AMP.
LCD
DRIVE
DM-101
BOARD
CK-103 BOARD
BACK
LIGHT
JK-211BD.
JK-211BOARD
Y
V
Z SENS RST
FSENS RST
CN753
MEMORY
STICK
SOCKET
USB
USB D+
USB D-
VIDEO OUT
AUDIO OUT
SPEAKER
MIC.
COLOR
LCD
MON.
LCD901
AV OUT
VR
VG
VB
CLK
FOCUS
MOTOR
DRIVE
TO/FROM FRONTCONTROL IC
IC001
DC CONT.
SY-68 BD.
ZOOM IRIS
FIGURE 7-1 - VIDEO PROCESSING 10/11/025DSC02c 1533
Video processing of the image falling on the CCD, as well as lens control operations are controlled by the
CAMERA DSP IC. See Figure 7-1.
1. Starting at the upper left corner of the block diagram, the image from the lens is input to the image processor
(includes the CCD).
2. After some processing by the image processors, it is input to the CAMERA DSP, which converts the signal to
RGB video components for the LCD panel and into three video components Y, C and V for the video amp.
3. The RGB signals for the LCD display are input to an LCD drive IC and then sent to the display
4. The YCV signals are input to a video amplifier that also combines the signals into one NTSC signal that is
sent to the A/V jack.
5. The video, in digital format, is also sent to the Memory Stick storage device and to the USB port via the MC
Camera SH DSP IC301.

16
8. DSC-S75 and DSC-S85 Lens Assembly
Chapter 8 - DSC-S75 and DSC-S85 Lens Assembly
The lens assembly is replaced as a module. Since it is not disassembled by the technician, its internal mecha-
nism will not be discussed.
The “electronics” associated with the lens consist of a focus motor, aperture (iris) servo-motor, zoom motor and
endpositionsensorsfor the zoom andfocuslenses. Theelectrical components, including themotors,areburied
inside the lens barrel and are not accessible.
Operation
1. Each of the three lens motors is driven by four pulsed dc lines.
2. Motor direction is determined by the sequence that the lines are pulsed.
3. The zoom and focus lenses have end sensors that determine the physical end positions of these lenses
during initialization.
4. The iris motor operates as a servo motor and is controlled by the light level falling on the CCD imager.

17
8. DSC-S75 and DSC-S85 Lens Assembly
M
FOCUS
SENSOR
M
ZOOM
SENSOR
M
LENS
2
4
5
3
11
9
12
15
14
3
5
10
IRIS A
IRIS B
IRIS
(SHUTTER)
DRIVE
FOCUS
MOTOR
DRIVE
IRIS A
IRIS B
8
6
7
5
FOCUS A
FOCUS A
FOCUS B
FOCUS B
ZOOM A
ZOOM A
ZOOM B
ZOOM B
F SENS RST
F SENS VCC
F SENS RST
F SENS VCC
IMAGE
PROCESSOR
ZOOM
MOTOR
DRIVE
IC301
CAMERA
DSP
B+ (3.2V)
SYS-68 BD.
CN202
CN201
FIGURE 8-1 - LENS ASSY.
IRIS
FOCUSZOOM
10DSC02 1494 10/11/02
Lens Initialization
The lens is initialized when the camera is powered up and just before it shuts down. See Figure 6-2.
The following occurs at power-up initialization:
1. Thezoomand focusmotorsturntowardstheir“reset” positions(maximumzoomandnearfocus, respectively)
extending the lens barrel to its extreme position.
2. The reset switches close when their respective lenses reach their reset positions. This resets the position
registers to zero. Since the motors are driven by pulsed signals, the registers can keep track of subsequent
lens positions by tracking the number of pulses that are sent to the motors. The tracking differentiates
between forward drive pulses and reverse drive pulses.
3. Once reset, the lenses reverse direction and turn to the extreme wide angle and infinity focus positions. The
+B voltage to the reset sensors is not needed any more and is switched off.
4. Once initialization has completed, the zoom and focus lens are not reinitialized until after both battery and AC
power are removed and then reconnected.
At power-down, the lens barrel extends to maximum position and then disappears completely into the camera
body before shutting down.

18
8. DSC-S75 and DSC-S85 Lens Assembly
Troubleshooting
Statistically, the number one replacement item on cameras is the lens assembly. Mostly because of physical
damage caused by either user carelessness or abuse. In many instances, the damage is visible but in other
instances, it may be internal and invisible. When no visible damage is noted, the technician has to determine if
the problem is with the lens or with the electronics controlling the lens.
?Look around the lens barrel lip or barrel sides for impact damage.
A very effective method of determining if the lens motors are working is to initialize the camera and listen to the
slightnoisefromthe zoom and focus motorsastheyare turning. The motors will usuallyturnandmake noise
even if the lenses are jammed. With some practice, the technician can discern the noises from each motor.
If noise is heard, it is a good indication that the electronics are working.
?check the lens cap switch first. If OK, the lens assembly may be defective. (It may also be caused by a
defective SY-68 board.) See Figure 8-2 for location of lens cap switch.
FIGURE 8-2