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Repair Manual
Americas Business Center
Technical Services
201 Burlington Road
Bedford MA 01730
TEL: 1.781.386.5309
FAX: 1.781.386.5988
SprintScan Slide Scanner
SS35 LE
September 1996
2
SprintScan 35LE Service Manual Table of Contents
Table of Contents
Page
1 - Functional Description ................................................................................ 4
Photoelectric Converter .............................................................................. 4
Analog-to-Digital Converter ........................................................................ 5
Data Transfer Module ................................................................................. 6
Command and Message Transfer............................................................... 6
2 - Disassembly ................................................................................................. 7
Removing Scanner Upper Housing............................................................. 7
Removing Scanner Lamp............................................................................ 10
Removing Main PC Board........................................................................... 11
Removing Chassis Assembly (with Filter/Motor)......................................... 13
Removing Power Supply............................................................................. 15
Removing Scanner Fuses........................................................................... 16
Replacing System Fuse............................................................................ 16
Replacing Power Supply Fuse ................................................................. 17
Removing AC Inverter................................................................................. 18
3 - Troubleshooting........................................................................................... 19
Electrical Problems ..................................................................................... 19
Checking Power Supply Output Voltages................................................. 23
Checking for Short Circuit on Main PC Board.......................................... 24
Checking Scanner Lamp .......................................................................... 25
Checking CCD Module............................................................................. 26
Checking for Main PC Board Failure........................................................ 28
Checking SCSI Port.................................................................................. 28
Checking Filter Stepper Motor Malfunction.............................................. 29
Checking Carriage Stepper Motor Malfunction ........................................ 30
Photo Sensor Error ................................................................................ 30
Stepper Motor Malfunction..................................................................... 31
Optical Problems......................................................................................... 32
Checking Focus and Alignment................................................................ 32
Correcting Focus and Alignment Problems.............................................. 35
Noise Problems........................................................................................... 36
3
SprintScan 35LE Service Manual Table of contents
List of Illustrations
Figure Page
1-1 Simplified Block Diagram....................................................................... 4
1-2 Photoelectric Converter......................................................................... 4
1-3 CCD Output Waveform.......................................................................... 5
1-4 CCD Output Signal After Bias Restored................................................ 5
2-1 Removing Lamp Lid............................................................................... 7
2-2 Removing Scanner Lamp ...................................................................... 8
2-3 Removing Upper Housing...................................................................... 8
2-4 Installing Upper Housing ....................................................................... 9
2-5 Replacing Scanner Lamp ...................................................................... 10
2-6 Removing Main PC Board ..................................................................... 11
2-7 Main PC Board ...................................................................................... 11
2-8 Major Component Numbers ................................................................... 12
2-9 Chassis Assembly Mounting Screws..................................................... 13
2-10 Filter/Motor Assembly Alignment........................................................... 14
2-11 Removing Power Supply........................................................................ 15
2-12 Replacing System Fuse......................................................................... 16
2-13 Replacing Power Supply Fuse............................................................... 17
2-14 Replacing AC Inverter ........................................................................... 18
3-1 Simplified Troubleshooting Diagram...................................................... 19
3-2 Power Supply Output Connector J6 Pin Assignment............................. 23
3-3 Pre/Post Processing CCD Output Waveforms....................................... 26
3-4 Pin Assignment for Connector J7 .......................................................... 27
3-5 Preprocessing CCD Output Waveform at J7, Pin 16............................. 27
3-6 Post-processing CCD Output Waveform at TP2 ................................... 28
3-7 CCD Response (Correct Focus and Alignment).................................... 33
3-8 CCD Response (Incorrect Focus and Alignment).................................. 34
List of Tables
Table Page
3-1 Troubleshooting Guide .......................................................................... 20
SprintScan 35LE Service Manual Functional Description
4
1 - Functional Description
The SprintScan 35LE (Figure 1-1) is a high-speed, high-resolution slide scanner that
converts pictures on slide into binary code for further processing by a host computer.
Figure 1-1. Simplified block diagram
The image is first converted into analog signals which vary in magnitude according to
shading in the original document. In the second phase, the analog signals are digitized.
The resulting binary codes stored in a video buffer and transmitted via the SCSI bus to the
host. Individual functional blocks are described in the following sections.
Photoelectric Converter
The photoelectric converter (Figure 1-2) consists of a light source, lens, and linear-array
CCD with associated driving circuitry.
Figure 1-2. Photoelectric converter (slide view)
Image
Photo-
Electric
Converter
Analog-
To-Digital
Converter
Data
Transfer
Module
Host
Transparent
CCD
Lens
Filter
Lamp
SprintScan 35LE Service Manual Functional Description
5
As shown in Figure 1-2, light from the lamp passes through the slide onto the surface of the
CCD, which generates electrical signals proportional to the intensity of the light. The CCD
is operated so that the magnitude of the electrical signal is linearly proportional to the
intensity of received light. Since the CCD scans one line at a time, a stepping motor is
used to move the slide so the CCD can scan the entire slide.
Analog-to-Digital Converter
Output from the CCD is fed to this module, and most of the scanned-data processing is
done in this stage. The waveform output by the CCD is shown in Figure 1-3, where the
magnitude of the output signal with respect to the bias voltage is a function of the intensity
of the light incident upon the CCD.
Figure 1-3. CCD output waveform
Since output-signal bias voltage varies for different CCDs, and output notches degrade
system response, the output-signal bias voltage is first restored to ground, and then a
sample-and-hold operation is carried out to eliminate output notches. The resultant
waveform is shown in Figure 1-4.
Figure 1-4. CCD output signal after bias restored
Output Notch
Valid Data
Vbias
Vaild Data
Vbias = Ground
SprintScan 35LE Service Manual Functional Description
6
From Figure 1-4 it can be seen that the CCD signal is smoother and the bias voltage is
independent of CCD characteristics.
The reference voltage is derived through a process called calibration. Because of the
characteristics of lamp and lens, the magnitude of the CCD’s output is lower toward the
beginning and end of a scan line than it is in the central portion, even when the input slide
is uniformly white. Calibration is used to compensate for this spatial variation.
Data Transfer Modules
In the third phase of scanner operation, the scanned data are transferred to the video ping-
pong buffer. Then the data in the buffer are moved out to the host computer via the SCSI
bus.
Command and Message Transfer
The scanner accepts commands from, and sends messages to, the host computer via the
SCSI bus. All commands and messages are transmitted in the form of records with a fixed
syntax. Command format and record syntax are described detail in the SprintScan 35LE
Command Set Manual.
SprintScan 35LE Service Manual Disassembly
7
2 - Disassembly
This section of the Service Manual describes SprintScan 35LE disassembly
procedures. Before carrying out any of the procedures described in this section, make
sure that the scanner has been turned off and the power cord has been disconnected.
To prevent any chance of electric shock, the SprintScan 35LE housing should only be
opened by qualified service personnel, and only after the scanner has been
disconnected from the power source.
Care should be taken throughout all disassembly and reassemble procedures never to
smudge or soil the lens or either mirror.
Removing Scanner Upper Housing
1. Turn off the power and disconnect the power cord.
2. Remove the scanner lamp lid (Figure 2-1).
Figure 2-1. Removing lamp lid
SprintScan 35LE Service Manual Disassembly
8
3. Remove the scanner lamp (Figure 2-2).
Figure 2-2. Removing scanner lamp
4. Remove the four (4) screws (Figure 2-3) securing the bottom case, then remove the
upper housing. The latch of the base housing may fall off.
Figure 2-3. Removing upper housing
SprintScan 35LE Service Manual Disassembly
9
To put the scanner upper housing back on, follow these steps:
5. Put the latch seated into its position, close the upper housing, align the tabs on the
bottom of the upper housing with the slots at the front and rear of the bottom case,
snap the housing back on (Figure 2-4) .
6. Then retighten the four (4) screws.
Figure 2-4. Installing upper housing
SprintScan 35LE Service Manual Disassembly
10
Removing Scanner Lamp
Notes: • The scanner lamp should be replaced if it begins to flicker or dim,
or if the READY indicator fails to come on and a lamp failure report is
returned when the N or S command is sent.
• Only use replacement lamps obtained from Polaroid or an authorized
distributor. Use of any other lamp may adversely affect scanning
results.
1. Turn off the power and disconnect the power cord.
2. Remove the scanner lamp lid (Figure 2-5) .
3. Replace the scanner lamp with a new one.
Figure 2-5. Removing scanner lamp
Scanning Lamp Specifications
Microtek Part Number 570-22-000004
Length
Diameter
Power Consumption
5.9" (149.9 mm)
0.6" (15.5 mm)
4W
Polaroid
1E6624A
SprintScan 35LE Service Manual Disassembly
11
Removing Main PC Board
1. Turn off the power and disconnect the power cord.
2. Remove the upper housing.
3. Remove the four (4) screws securing the main PC board (Figure 2-6).
Figure 2-6. Removing main PC board
4. Disconnect all connectors and then lift out the main PC board (Figure 2-7).
Figure 2-7. Main PC board
SprintScan 35LE Service Manual Disassembly
12
5. Major component numbers are shown in Figure 2-8.
Figure 2-8. Major component numbers
J5 J6
J7
J3
J1
J2
To Carriage Motor
To Filter Motor
M-922
To Fan
SCSI Interface
SCSI ID
SW1
To Voltage
To Power Supply
TP4
TP3
TP2
TP1
CCD Counector
SprintScan 35LE Service Manual Disassembly
13
Removing Chassis Assembly (with Filter\Motor)
1. Turn off the power and disconnect the power cord.
2. Remove the upper housing.
3. Remove the main PC board.
4. Remove the three (3) screws (Figure 2-9) securing the chassis assembly.
5. Lift out the chassis assembly.
Figure 2-9. Chassis assembly mounting screws
6. Remove the filter mount setscrew to remove the filter/motor assembly
(Figure 2-10) from the chassis assembly.
Note: Always refer to the Filter/Motor Assembly Alignment procedure in Section 3
of this Service Manual when reinstalling chassis assembly
Set screw, 1/8"
SprintScan 35LE Service Manual Disassembly
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Figure 2-10. Filter assembly alignment
Photo sensor
SprintScan 35LE Service Manual Disassembly
15
Removing Power Supply
1. Turn off the power and disconnect the power cord.
2. Remove the upper housing.
3. Remove the main PC board.
4. Remove the chassis assembly.
5. Remove the four (4) screws securing the power supply (Figure 2-11) to the
bottom case.
Figure 2-11. Removing power supply
6. Remove the power supply.
7. Once the power supply is fixed, replace it on the bottom case and tighten the
four (4) securing screws.
SprintScan 35LE Service Manual Disassembly
16
Removing Scanner Fuses
Notes: • If the POWER indicator, READY indicator and scanner lamp all fail to
light up when the SprintScan 35LE scanner is turned on, first make sure
that power exists at the source.
• If power availability can be confirmed and the scanner’s lights still fail to
come on, check the fuse.
There are two fuses installed in the SprintScan 35LE scanner: one is located at the rear
of the scanner and the other is located in the power supply.
Replacing System Fuse
1. Turn off the power and disconnect the power cord.
2. Use a flat screw driver to lever over the fuse lid (Figure 2-12).
Figure 2-12. Replacing system fuse
3. Replace the fuse. (A spare fuse is located close to the rear side.)
Fuse Specifications (At the rear)
UL and CSA
(U.S.A)
Bel 5MF 1.6, Buss GMA-1 6/10,
Little 23501.6A
TUV GS
(Europe)
Bel 5SF 1.6, Eska 520.600,
Little 2170.16, Olvis EA,
Schurter SP001.1006
Fuse
SprintScan 35LE Service Manual Disassembly
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Replacing Power Supply Fuse
1. Turn off the power and disconnect the power cord.
2. Remove the scanner upper housing.
3. Remove the main PC board.
4. Remove the broken fuse (Figure 2-13) and replace it with a new one.
Fuse rating: 2.5A/250V or T2.5A/250V (Europe).
Figure 2-13. Replacing power supply fuse
SprintScan 35LE Service Manual Disassembly
18
Removing AC Inverter
1. Turn off the power and disconnect the power cord.
2. Remove the upper housing.
3. Remove the screw securing the AC Inverter (Figure 2-14) to the bottom case.
4. Disconnect the four (4) cables connected to the scanning lamp. Lift out the AC
Inverter.
Note:
If applicable, remove the broken fuse and replace it with a new one.
The AC Inverter fuse is soldered on the AC Inverter PC board. In many
cases, problems may be solved by replacing.
5. When fuse replacement is completed, replace the AC Inverter on the bottom case
and tighten the screw securing it to the bottom case.
Figure 2-14. Removing AC inverter
SprintScan 35LE Service Manual Troubleshooting
19
3 - Troubleshooting
Scanner failures can be divided into three major categories: electrical, optical and
mechanical. Here are the functional inspection steps:
• Power up the scanner/host system.
• Wait for the scanner’s READY indicator to light up steadily.
• Establish communication between scanner and host.
• Inspect scan quality.
Electrical Problems
Figure 3-1 shows a simplified block diagram indicating the types of electrical
problems that may cause the scanner to malfunction. The troubleshooting guide in
Table 3-1 lists and describes each electrical problem that may cause the scanner to
malfunction. Table 3-1 also indicates the recommended corrective action that should
be taken to repair the scanner.
Figure 3-1. Simplified troubleshooting diagram
Power Failure?
Power Problems
Lamp On?
"Scanner Not Ready"
Lamp & AC Inverter
Filter OK?
"Scanner Not Ready"
Filter Failure.
CCD Module?
"Scanner Not Ready"
CCD Module Failure
Scanning Failure?
SCSI Failure
A
Stepping Motor OK ?
A
Stepping Motor Failure
SprintScan 35LE Service Manual Troubleshooting
20
Table 3-1. Troubleshooting Guide
Problem Possible Cause Corrective Action
POWER LED off • Incorrect voltage Make sure voltage is correct.
after scanner to power supply
powered up
• Burned out or Replace burned out or broken fuse.
broken fuse Refer to replacement procedure in
Section 2 of this the Service Manual.
Note: If replacing fuse does not
correct the problem, return
scanner for repair.
• Power supply Check power supply output voltages.
failure Refer to Power Supply test procedure in
this Section of the Service Manual.
• Short circuit on Refer to Short Circuit test procedure
main PC board in this Section of the Service Manual.
• Power LED Check for:
failure
• +5 to 5.01VDC at J6, Pin 1.
• +5 VDC at J6, Pin 5.
Note: If voltages are correct, replace
Power LED (CR10).
/
