Polaroid SS35 LE User manual

Brand: Polaroid

Model: SS35 LE

Type: User manual

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

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

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

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

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

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

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

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

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

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)

Polaroid

1E6624A

SprintScan 35LE Service Manual Disassembly

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

5. Major component numbers are shown in Figure 2-8.

Figure 2-8. Major component numbers

J5 J6

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

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

Figure 2-10. Filter assembly alignment

Photo sensor

SprintScan 35LE Service Manual Disassembly

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

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

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

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

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

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).

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Polaroid SS35 LE User manual

Polaroid SS35 LE User manual

Polaroid SS35 LE User manual

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