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Toe 4100 SERIES

MAINTENANCE MANUAL

TANDBERG DATA AJS Data Storage Division P.O. Box 9 Korsvoll N-0808 OSLO. NORWAY Phone + 4721890 90 Telefax + 472 189550 Telex 74606 tdata n

© Tandberg Data A/S

Part No. 422686 Rev. 01.0 Pub!. No. 6028- 1 October 1991

Related publications available from our Sales Department:

PUbi. No.

6CIJ9 6046

(:fJ47

Part No.

422124 423040 423042

Trtle

IDe

4100 Series Reference Manual

IDe

4100 SCSI-1 Interface - Functional Specifications

IDe

4100 SCSI-2 Interface - Functional Specifications

This publication may describe designs for which patents are granted or pending. By publishing this information, Tandberg Data A/S conveys no license under any potent or any other rights.

Every effort has been made to avoid errors in text and diagrams.

However, Tandberg Data A/S assumes no responsibility for any errors which may appear in this publication.

It is the policy of Tandberg Data A/S to improve products as new techniques and components become available. Tandberg Data A/S therefore reserves the right to change specifications at any time.

We would appreCiate any comments on this publication.

Table of Contents

Part ^1.

^{lead Thl$ Fltsl 1-1}

One

^1.1. Updating/Backdating 1-2

2. A Shod Description of the Dlive 2-1

2.1. Illustrated Description 2-1

2.2. Interconnection Diagram 2-2

3. Block Diagrams 3-1

3.1. Overall Block Diogram 3-1

3.2. SCSI Mainboard Block Diagram 3-2

Part

^4. The SCSI Mainboord 4-1

Two

^4.1. Description/Schematic Diagrams 4-1

4.2. The Digital Block 4-1

4.3. The Analog Block 4-3

4.4. SCSI Mainboard Component Location 4-5

4.5. SCSI Mainboard Mnemonics Ust 4-6

5. The Sensor Board 5-1

5.1. Description/Schematic Diagram 5-1

5.2. Sensor Boord Component Location 5-3

5.3. Sensor Boord Mnemonics List 5-3

Part ^6.

Troubleshooting

6-'

Three

^6.1. 6.2. ^General Error Conditions ^6-1 6-2 6.2.1. Dead Drive/Unable to Communlcate/

FaRing Power-up 6-2

6.2.2. Read Errors 6-2

6.2.3. Write Errors/Erose Errors 6-4

6.2.4. Sensor Boord Related Errors 6-4

6.2.5. Capstan Motor Related Errors 6-5

6.2.6. Stepper Motor Related Errors 6-5,

6.2.7. Impodant Voltages and Frequencies 6-6

7. Maintenance 7-1

7.1. Service Philosophy 7-1

7.2. Se/ftests 7-1

7.3. Power-Up Se/ftest 7-7

7.4. The Manually Activated Selffests 7-1

7.4.1. How to Activate the Se/ftests Manually 7-2

7.5. The Host Activated Se/ftests 7-3

7.6. Head Cleaning 7-4

7.7. Tools for Adjustment 7-5

7.B. Necessary Hand Tools 7-5

7.9. Diagnostic Tools 7-6

7.10. Adjustments (See also Chapter 9) 7-6

I TOC 4100 Maintenance Manual

Tandberg Data Table of Contents

8. How

to

Change the Different Modules 8-1

8. 1. Removing the Drive 8-7

8.2. Changing the Sensor Board 8-1

8.3. Changing the SCSI Mainboard 8-2

8.4. Changing the Stepper Motor 8-3

8.5. Changing the Head Assembly 8-4

8.6. Changing the Capstan Wheel 8-5

8.7. Changing the Capstan Motor 8-5

8.8. Replacing the Top Cover 8-6

8.9. Firmware (FLASH Memory) Upgrading 8-7

8.9.1. Program and Files Needed 8-7

8.9.2. Upgrade Execution 8-7

8.9.3. Firmware Upgrade Using a Firmware Tape 8-7

9. Adjustments 9-1

9.1. Tools for Adjustment 9-7

9.2. Service Port Details 9-7

9.3. Sensor Sensitivity Adjustment 9-2

9.4. Automatic Adjustment and Tests 9-3 9.S. Manual Adjustment with BirdTalk 9-4 9.S.1. Adjustment of Write Current and Write Symmetry 9-4

9.S.2. Read Gain Adjustment 9-S

9.S.3. Read Channel Pulse Slimming Adjustment 9-S 9.S.4. Read Clock Center Frequency Adjustment 9-S

10. Spare Module Ust 10-1

ii TDC 4100 Maintenance Manual

1.

QIC-1000 - 30 tracks QIC-525 - 26 tracks QIC-150 - 18tracks QIC-120 - 15 tracks QIC-24 - 9-tracks

Three main paris

Part One

Port Two

Part Three

Read This First

This manual is intended for service technicians who have attended a Tandberg Data service course on TDC 4100 Series drives.

The TDC 4100 Series Drive handles different tape formats according to the table below:

Tape Format Capacity

I

^Write

^Read

OIC-1000 1.0 GByte Yes Yes

OIC-525 525 MByte Yes Yes

OIC-150 155 MByte Yes Yes

OIC-120 125 MByte Yes Yes

OIC-24 60 MByte

No

Yes

To avoid duplication and to save space, we have omitted in this manual such descriptions of the Drive that are given in the TDC 4100 Series Reference Manual. We therefore strongly recommend that the reference manual is considered a part of the maintenance manual, and that you use it as a source of details that the maintenance manual does not supply.

This manual can be regarded as divided into three main parts.

The first part (Chapters 1, 2, and 3) gives a general description of the Drive. It comprises

an

illustrated description, an interconnection dia- gram and block diagrams.

The second part (Chapters 4 and 5) contains some schematics, mne- monics lists and component location drawings of the two printed circuit boards (Mainboard and Sensor Board).

The third part (Chapters 6, 7, 8, 9 and 10) contains a troubleshooting guide, explains the Drive's resident selftests, how to replace all mechanical assemblies and the extensive adjustment procedures.

Furthermore you will find an illustrated spare module list.

Contact our local representative or our Sales Department if you have any questions regarding service courses or additional documentation. Refer

also to the back of this publication. .

1-1 TDC 4100 Maintenance Manual

Tandberg Data Read This First

1.1. Updating/Backdating

The updating routine for this manual is based on the distribution of ECNs (Engineering Change NoticEls). The ECNs describe changes in hardware and firmware from the time of the first release of the product.

NOTE:

If you want updating/backdating for your maintenance manual, please contact your local Tandberg Data representative or subsidiary company for ECN dispatch.

1-2 TOC 4100 Maintenance Manual

2. ^A Short Description of the Drive

2. 1. Illustrated Description

The Tandberg Data TDC 4100 Series Drives are streaming 114" tape- cartridge drives.

Spring prevents canrldge from being Insened the wrong way

Direct-drive brushless capstan motor The mechanical switches of

the Sensor Board assembly register whether the door Is closed, the canrldge Is In- sened or not and whether It Is write protected or not.

The board also comains Infrared transmitters and re- ceivers that sense the tape holes (BOT, EOT, etc)

Rigid die-cast aluminium chassis

Two-channel read/write head with full-width erase bar bonded on platform

Stepper motor moves the head up and down to the desired track Can ridge door opening button

/

canridge door

canrldge eject-arm assembly

SCSI Malnboard

Figure 2.1 Illustrated description of the TDC 4100 Series Drive.

The Drive shown without top cover.

2-7 ^TDC 4 700 Maintenance Manual

Tandberg Data A Short Description of the Drive

2.2. Interconnection Diagram

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2-2 TDC 4100 Maintenance Manual

3. Block Diagrams

3.1. Overall Block Diagram

Capstan Motor Assembly

Figure 3.1 OveraU Block Diagram

Sensor Assembly

The following sensors are located on the Sensor Board (see the inter- connection diagram, Section 2.2):

• SAFE: A microswitch operated by the write protect switch on the tape cartridge. Prevents writing when the cartridge is write protected.

• IN PLACEIDOOR CLOSED: A microswitch operated by the tape cartridge. Prevents operation when the door is not closed or when no cartridge is inserted.

• LPIBOTIEOTIEW: Opto-electronic sensors that detect holes in the upper and lower half of the tape. The sequence of pulses from the two sensors allow the control logic to determine whether a BOT- (Beginning Of Tape), an EOT- (End Of Tape), an LP- (Load Point) or an EW- (Early Warning) situation has been detected

Capstan Motor Assembly

The capstan motor with its built-in tacho sensor provides the tape motion required for the various operating modes: ReadlWrite, WindlRewind. The capstan motor is a DC operated brushless motor.

3-7 TDC 4100 Maintenance Manual

High-resolution stepper mechanism

Tandberg Data Block Diagrams

Head Assembly

The read/write and erase functions are rombined ⁱⁿ one common head.

The erase section is active over the full width of the tape and thus erases all tracks in one operation. The read/write sections are active only for one track at a time. Since a read check. is always carried out after the writing of each block of data, the head has one section for forward tape motion and one section for reverse tape motion. Track locations on the tape are illustrated in the TDC 4100 Series Refere1lliCl! Manual; Section 3.6.2.

SCSI Mainboard Assembly

See separate block diagram, Section 3.2.

Stepper Motor Assembly

. The Stepper Motor is a part of the head motion system which ensures that teading or writing takes place on the exact track.

MCU

AIC-62SO SCSI Controller

The high-resolution stepper mechanism has 5 micrometers per step. The head motion is controlled by the microprocessor which allows high accuracy dynamic head positioning. A detailed description of the principles for the track position algorithm is given in the TDC 4100 Series Reference Manual, Section 2.3.

3.2. SCSI Mainboard Block Diagram

Detailed descriptions of the separate blocks are found in Chapter 4 - Section 4.1.

I

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3-2 TDC 4100 Maintenance Manual

Tandberg Data Block Diagrams

This Page Intentionally Left Blank

3-3 TDC 4100 Maintenance Manual

4. The SCSI Mainboard

The following description handles the current revision of the SCSI Main- board. For further updating see the ECN routine (Chapter 1).

4.1. Description/Schematic Diagrams

The TDC 4100 SCSI Malnboard consists of

• the Digital Block and

• Section 4.2

• the Analog Block • Section 4.3

4.2. The Digital Block

The Digital Block consists of two parts:

• the Computer Unit

• the Formatter

4-1 IDC 4 700 Maintenance Manual

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Tandberg Data The SCSI Mainboard

4.3. The Analog Block

The Read Channel (- 10-)

The Read Channel receives a low level signal from the pre-amplifier in- side the head This signal is amplified, filtered, and converted into digital serial data.

The Write Channel (- 15-)

The Write Channel receives digital write signals, and converts these into write current for the write head. The Write Channel block also contains the Erase Circuit.

The LED Step Driver (-18-)

The LED Step Driver consists of a LED and step motor driver circuit, an output latch for controlling analog functions, several D/A converters and the Reset Circuit.

The Motorservo (- 19-)

The Motorservo controls the capstan motor speed according to a digital reference.

4-3 TOG 4 700 Maintenance Manual

Tandberg Data The SCSI Mainboard

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Tandberg Data The SCSI Mainboard

4.4. SCSI Mainboard Component Location

Drive Controller

Data Separator Data Buffer

Power cable Service Port!

Connector Test Connector

Stepper Motor CoImector

Processor RAM

FLASH Memory

68HC11F1 Processor

SCSI- Controller

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Controller

Terminator Networks

Figure 4.1 SCSI Mainboard Component Location

4-5 TOC 4100 Maintenance Manual

I

^Mnemonic

+12VOLT +12VSLEEP +12V_M +5VOLT +5VREG +8VREG o.VOLT 14M4_SERVO 28K125 28M8_DC 28M8_EDC 531PS*

9.5V_CHo.

9.5V_CH1 BIRDIN*

BIRDour BITSHITsr BOOTUP*

CENTER_o.

CENTER_1 ERA+

ERA- ERAEN ERASE ERASE*

ERVOLT FWD FWD*

GAIN_C GAIN_F HIGH_BP INPLACE*

LOWBW LOW_BP LWSNS*

LWTST MIDBW MID_BP MOTOREN PARITY"

PORTSEL*

PULSESLIM PWM

Tandberg Data The SCSI Mainboard

4.5. . SCSI Mainboard Mnemonics List

I

^Function

2 V input to drive

DC voltage derived from + 12V global. For the Read channel.

12 V supply to capstan motor 5V input to drive

Regulated 5 V derived from +8VREG Regulated 8 V derived from +12 V global 0. V (ground) input to drive

Clock signal to servo motor

28K125 clock signal input to capstan motor PWM

28M8 clock signal input to Formatter. Derived from 28M8.

28M8 clock signal input to EDC Controller. Derived from 28M8.

Signal used to control the capstan motor servo Power supply to preamplifier (in-head) for CHo. (fwd) Power supply to preamplifier (in-head) for CH1 (rev) Serial input line from the service port

Serial output line to the service port

Bitshift detector output from Data Separator. Output to test port.

Service port line for reprogram FLASH memory See WR_CENTER_o.

See WR_CENTER_1 Connection to erase coil Connection to erase coil

Signal that controls the power supply of the erase circuit

Signal that toggles the erase coil current (9.6 MHz). Low when erase is not on. COmplementary to ERASE*.

Signal that toggles the erase coil current (9.6 MHz).

Erase circuit fault monitoring voHage. Input to AID of MPU.

Selects read and write channels, and capstan motor direction Selects read and write channels

Sets the read channel gain (coarse). Output from D/A Sets the read channel gain (fine). Output from D/A

Signal that selects a bandpass fiHer at 1.2 MHz in the read level detector (also gives 20. dB extra gain).

Signal from a mechanical microswitch when a cartridge is inserted Signal that selects the lowest read channel bandwidth (for QIC-12o./15o.

andQIC-24)

Signal that selects a bandpass fiHer at 0..48 MHz in the read level detector (also gives 20. dB extra gain)

Output from the sensor circuit. Gives a burst of pulses when a lower tape hole is detected.

Sensor circuit test point. Used for calibrating the lower sensor Signal that selects the middle read channel bandwidth (for QIC-1o.o.o.

53 ips and QIC-525)

Signal that selects a bandpass fiHer at 0..6 MHz in the read level detector (also gives 20. dB extra gain)

Enables the PWM signal to the capstan motor Output Enable stroke to the memory chips

Input from the service port to enable the Drive for parity checking on the SCSI-bus

Selects the TDC1o.o.9-chip (Service port)

Sets the read channel pulse slimming. Output from D/A.

Pulse width modulator output. To capstan motor.

4-6 IDe 4700 Maintenance Manual

J

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^Mnemonic

PWR RCLK"

RCLKTSr RDATA READO+

READO- READ1+

READ1- READTST RESEr RPLSTST SACK*

SAFE SATN*

SBSY*

SC/D*

SCLK SCSIRST*

SDAT<7 .. 0>*

SDATA SDATPAR*

SELO*

SEL1*

SEL2*

SELD/A1*

SELD/A2*

SELDSEP*

SELFTESr SELLDsr SENSORFREQ SIIO*

SLEEP*

SMSG*

SPEED SREQ*

SSEL*

STEP1*

STEP2*

STEP3*

STEP4*

TACHO TEMP TERMPWR

Tandberg Data The SCSI Mainboard

I

^Function

5 V supply to SCSI bus termination network

Recovered read channel clock. Generated by the Data Separator VCO.

Used to clock the recovered. data into the Drive Controller.

Test Signal derived from RCLK*. Output to test port.

Recovered read channel data. Output from the Data Separator. Clocked into the Drive Controller by RCLK*.

Connection to read head CHO (fwd). From preamplifier (in-head).

Connection to read head CHO (fwd). From preamplifier (in-head).

Connection to read head CH1 (rev). From preamplifier (in-head).

Connection to read head CH1 (rev). From preamplifier (in-head).

Test Signal for the read channel analog signal at comparator and detector input. Output to test port.

Resets the Drive

Test signal from the Data Separator. A read pulse (RPLS) is given for each qualified zero crossing. Output to test port. . SCSI control signal.

Signal preventing erase and write operation of write protected cartridges.

Output from sensor circuit.

SCSI control signal SCSI control signal SCSI control signal SPI bus clock signal

Reset input from the SCSI-bus SCSI data bus

SPI-bus serial data SCSI parity signal

SCSI device address used to determine the SCSI-device address and to execute the proper seHtest

SCSI device address used to determine the SCSI-device address and to execute the proper seHtest

SCSI device address used to determine the SCSI-device address and to execute the proper seHtest

SPI-bus select line for D/A converter 1 SPI-bus select line for D/A converter 2 SPI-bus select line for Data Separator Activates the intemal selttest of the device SPI-bus select line for LED/step driver

Clocking Signal that controls the current in the LED of the Tape Hole Sensor. Frequency is 28.125 kHz, duty cycle 25 %.

SCSI control signal

When Drive not active. Circuits not requiring power are deactivated.

SCSI control signal

Generates speed reference. Duty cycle selectable in 1/256 steps. The signal is a PWM controlled 28.125 kHz signal.

SCSI control signal SCSI control signal Step motor connection Step motor connection Step motor connection Step motor connection

Contains motor speed information. Derived from the Hall IC outputs of the capstan motor.

Signal goes high if motor temperature reaches a critical value Connection of 5 V extemal power to the termination network

4-7 IDC 4 700 Maintenance Manual

I

^Mnemonic

THRESHOLD UPSNS*

UPTST WRCENTER_O WRCENTER_1 WREN

WRITECURR WRITEDATA WRITEDATA*

WRITESYM WRSIGO+

WRSIGO- WRSIG1+

WRSIG1- WRSIG_O+

WRSIG_O- WRSIG_1+

WRSIG_1- WRVOLT

Tandberg Data The SCSI Mainboard

I

^Function

Sets the qualification comparator threshold. Output from D/A.

Output from the sensor circuit. Gives a burst of pulses when an upper tape hole is detected.

Sensor circuit test point. Used for calibrating the upper sensor.

Connection to center tap of the write coil for CHO (fwd) Connection to center tap of the write coil for CH1 (rev) Signal setting the modules for write operation

Sets the write current. Output from D/A.

Signal that toggles the write current. Low when not writing.

Complementary to WRITEDATA*.

Signal that toggles the write current. Low when not writing.

Set the write current symmetry. Output from 01 A.

Same as WRSIG_O+

Same as WRSIG_O- Same as WRSIG_1 + Same as WRSIG_1-

Write coil connection CHO (fwd) Write coil connection CHO (fwd) Write coil connection CH1 (rev) Write coil connection CH1 (rev)

Write circuit fault monitoring voltage. Input to AID of MPU.

4-8 IDC 4 700 Maintenance Manual

5.

Set for Write protection:

•

The Sensor Board

5.1. Description/Schematic Diagram

~-,=-... _ .. __ ... _-_ ... ,.;:,-.-==":-.

-=---.

• SAFE Is true when the tape cartridge In the TDC 4100 Series Drive is set for write protection (5501 open).

• SwHch S502 confirms the presence of a cartridge in the Drive by generating . the INPLACE* signal (S502 closed).

Light from the two light-emitting diodes CRSI and CR52 activates the corresponding photo transistors Q501 and Q502 when a hole in the tape opens the light path. Q501 will detect a hole in the upper part of the tape that results in UPSNS* being generated. LWSNS* is generated in the same way when Q502 detects a hole in the lower half of the tape. These signals are analyzed by the processor on the Mainboard in order to determine the position of the tape.

5-7 TOe 4 700 Maintenance Manual

Tandberg Data The Sensor Board

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Tandberg Data The Sensor Board

5.2. Sensor Board Component Location

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Figure 5.1 Layout of Sensor Board Assembly

5.3. Sensor Board Mnemonics List

I

^Function

Sensor frequency Ground

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Cartridge write protected

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+ 5 V to Sensor Board +12 V to Sensor Board

5-3 TDC 4 700 Maintenance Manual

6. Troubleshooting

6.1. General

This troubleshooting guide does not provide complete fault diagnostics, but is meant to be a guidance to locate faulty modules.

Tools needed for troubleshooting are the same as in Section 9.1. Tools for Adjustment.

In most cases the TDC 4100 BirdTalk will provide the best support when locating defects.

A description of the different signals is found in Section 4.5. SCSI Main- board Mnemonics List.

In this guide, the error conditions are divided into the following six groups:

6-7

(j) Dead drivelunable to communicate/failing power-up

@ Read errors

(3) Write errorslErase errors

@ Sensor Board related errors

@ Capstan Motor related errors

<B> Stepper Motor related errors

TOG 4100 Maintenance Manual

I I

Tandberg Data Troubleshooting

6.2. Error Conditions

6.2.1. Dead Drive/Unable to Communicate/failing Power-up

Cause of failure: SCSI Mainboard

6.2.2. Read Errors

Probable cause offailure: SCSI Mainboard or Magnetic Head IMPORTANT!

Signal conditions are based on using TDC 4100 BirdTalk.

Writing high density pattern QIC-l000 at 53 ips!

Important signals:

I

^Signal

I

Reading Forwards RDATA +SVDC*)

READTST 2 V pop 1.2 MHz sinewave RPLSTST TTL 2400 KHz

RCLKTST TTL 2400 KHz Outputs from the Read Head:

I

^Signal

I

Reading Forwards READO+ 30 m V pop 9 V offset READO- 30 m V pop 9 V offset READ 1 + **)

READ1- **)

Inputs to the Read Head:

I

^Signal

I

Reading Forwards 9.SV_CHO 10 V DC

9.SV CH1 0 V DC

NOTE*):

I

Reading Reverse +SVDC*)

2 V p-p 1.2 MHz sinewave TTL 2400 KHz

TTL 2400 KHz

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Reading Reverse

**)

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30 m V pop 9 V offset 30 m V pop 9 V offset

I

Reading Reverse OVDC

10VDC

I

^Testpolnt

T329 Service port Service port Service port

I

^Testpolnt

J6-2 J6-3 J6-6 J6-7

I

^Testpolnt

J6-1 J6-S

TI'L pulses when using anything else than high density pattern, e.g.

60Hor29H.

NOTE**):

READO+ and READl+ are connected together at J6 on the Mainboard.

READO- and READl-are connected together at J6 on the Mainboard.

Signal amplitude in forward direction measured with ERASE turned OFF.

6-2 TOC 4700 Maintenance Manual

Malnboard Testpolnt

T29 T31 T59 T63 T223 T271 T308 T326 T330 T333 T334 T335 T337 T339 T345 T346

T3n

J2-1 J2-2,3 J2-4 J5-1 J5-2 J5-3 J5-4 J5-5 J5-6 J5-7 J5-9 J6-1 J6-2 J6-3 J6-S J6-6 J6-7 J7·1 J7·2 J7·3 J7·4 J7·5 J7·6 J8-2 J8-3 J8-S J8-6 J8-7 REAOTST RPLSTST RCLKTST

Location

2C 20 7C 6C 2C 5E 3F 5E 4E 5C 50 5C 5C 5E 6F 6C 6F 9A Power Connector

7A WritelErase Head Connector

2D Read Head Connector

1C Head Stepper Motor Connector

SA Capstan Motor Connector

9B·C Test Conn- ectorl Service Port

Tandberg Data

Signal Name

+8VREG\G +12VSLEEP\G WRITEOATA WRrrEOATA' +5VREG\G 19M2 RESET",I 28MB ROATA ERASE ERASE"

14M4_SERVO 281<125 SPEED MCTOREN WREN ERAEN +12VOLT OVOLT +SVOLT WRSIGO+

WRCENTER_O WRSlGo- WRSIG1+

WRCENTER_1 WRSIG1- ERA+

ERA- 9.5V_CHO READO+

READO- 9.SV_CH1 READ1+

READ1- STEP1"

+12V STEP2"

+12V STEP3"

STEP4"

+12V_M\G PWM +SV TEMP TACHO READTST RPLSTST RCLKTST

6-3

Sensor Board Testpolnt

J4·2 J4-3 J4-4 J4·S J4-6 J4-8 J4-9

Location

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TOC 4100 SCSI MAINBD./SENSOR BD, COMPONENT MARK SOLDER SIDE

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IDe 4100 Maintenance Manual

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6.2.3. Write Errors/Erase Errors

Probable cause offailure: SCSI Mainboard or Magnetic Head IMPORTANT!

Signal conditions are based on using TDC 4100 BirdTalk.

Writing high density pattern QIC-l000 at 53 ips!

Important Write signals:

I

^Signal

I

Writing Forwards

WREN High

WRITEDATA TTL 1200KHz WRITEDATA* TTL 1200KHz WRVOLT See table below Inputs to the Write Head:

I

^Signal

I

Writing Forwards WRSIGO+ 1200 KHz 12 V DC WRSIGO- 1200 KHz 12 V DC

WRSIG1+ OVDC

WRSIG1- OVDC

WRCENTER_O 12VDC WRCENTER 1 OVDC

Important Erase signals:

I

^Signal

I

^Erasing

ERAEN High

ERASE 9.6 MHZ TIL ERASE* 9.6 MHZ TIL ERVOLT See table below Inputs to the Erase Head:

I

^Signal

I

^Erasing

ERA+

ERA-

9.6 MHz 28 V p-p 9.6 MHz 28 V p-p

I

Writing Reverse Low

TIL 1200KHz TIL 1200KHz See table below

I

Writing Reverse OVDC

OVDC

1200 KHz 12 V DC 1200 KHz 12 V DC OVDC

12VDC

I

Not Erasing Low

OVDC OVDC See table below

I

Not Erasing Approx. 4.6 V DC Approx. 4.6 V DC

I

^Testpolnt

T346 T59 T63

I

^Testpolnt

J5-1 J5-3 J5-4 J5-6 J5-2 J5-5

I

^Testpolnt

T377 T333 T334

I

^Testpolnt

J5-7 J5-9

WRVOLT and ERVOLT are values that are visible in TDC 4100 BirdTalk under Drive Adjust as AD write level and AD erase level.

Typical values are:

Write ON: AD write level:

Write OFF: AD write level:

Erase ON: AD erase level:

Erase OFF: AD erase level:

NOTE:

70 -> 145

<40

200 -> 255 - typical value: 255 89 -> 161

Because the Drive performs Read-After-Write, Write errors can be caus- ed from failures in Read Channel module.

Tandberg Data Troubleshooting

6.2.4. Sensor Board Related Errors

Probable cause offailure: SCSI Mainboard or Sensor Board

Inputs to the Sensor ~oard:

I

^Signal

I

Lower Hole Active

I

Upper Hole ActIve

I

^Testpoint

+5V +5VDC +SVDC J4-6

+12 V\G +12 V DC +12 V DC J4-2

SENSORFREQ 28.125 KHz 28.125 KHz J4-9

Outputs from the Sensor Board:

I

^Signal

I

Lower Hole Active

I

Upper Hole Active

I

^Testpolnt

UPSNS* OVDC 28.125 KHz TTL J4-5

LWSNS* 28.125 KHz TIL OVDC J4-8

UPTST 12VDC 12JLs±2 *) J4-10

LWTST 12 ILs±2') 12VDC J4-7

SAFE Low when the cartridge is write protected J4-3 INPLACE* Low when the cartridge is present in the Drive J4-4

NOTE*):

See figure in Section 9.3. Sensor Sensitivity Adjustment.

< ^{Fold Out}

TOe

4100 Maintenance Manual