Toshiba GD-1370 User manual

SERVICE MANUAL
FAX BOARD
GD-1370
Model: H625
Publish Date: March 2016
File No. SME150018B0
R150521Q4002-TTEC
Ver02 F_2020_Mar

Trademarks
• Company names and product names in this manual are the trademarks of their respective
companies.
© 2016-2020 Toshiba Tec Corporation All rights reserved
Under the copyright laws, this manual cannot be reproduced in any form without prior written permission
of Toshiba Tec Corporation.

GENERAL PRECAUTIONS REGARDING THE SERVICE FOR
GD-1370
The installation and service shall be done by a qualified service
technician.
1. Transportation/Installation
- The equipment is quite heavy, therefore pay full attention when handling / transporting / installing
it.
- Be sure not to hold the movable parts or units (e.g. the control panel, ADU or DF) when
transporting the equipment.
- The equipment must be grounded for safety.
- Select a suitable place for installation. Avoid excessive heat, high humidity, dust, vibration and
direct sunlight.
- Provide proper ventilation since the equipment emits a slight amount of ozone.
- To insure adequate working space for the copying operation, keep a minimum clearance of 30
cm (11.8") on the left, 80 cm (32") on the right and 20 cm (7.9") on the rear.
- The equipment shall be installed near the socket outlet and shall be easily accessible.
- Be sure to fix and plug in the power cable securely after the installation so that no one trips over
it.
- When the equipment is used after the option is removed, be sure to install the parts or the covers
which have been taken off so that the inside of the equipment is not exposed.
- Do not use an ozone generator near the MFP. Or, place any ozone generator as far away from
the MFP as possible.
- Do not use an ultrasonic humidifier near the MFP.
Components such as chlorinate and mineral will be atomized by an ultrasonic humidifier and they
will adhere to electric parts and optical parts in the MFP. This could cause malfunctions. When
you find it, explain its risk to your customer.
2. General Precautions at Service
- Be sure to turn the power OFF and unplug the power cable during service (except for the service
should be done with the power turned ON).
- After the power cable is disconnected, an electric charge may remain in the boards of the
equipment. Therefore, be sure to disconnect or connect the connectors when about 1 minute
(e.g.: the time for taking off the rear cover) has passed after the power cable is disconnected.
- The fuse could be in the neutral. The mains supply shall be disconnected to de-energize the
phase conductors.
- Unplug the power cable and clean the area around the prongs of the plug and socket outlet once
a year or more. A fire may occur when dust lies on this area.
- When the parts are disassembled, reassembly is the reverse of disassembly unless otherwise
noted in this manual or other related documents. Be careful not to install small parts such as
screws, washers, pins, E-rings, star washers, harnesses in the wrong places.
- Basically, the equipment should not be operated with any parts removed or disassembled.
- The PC board must be stored in an anti-electrostatic bag and handled carefully using an
antistatic wrist strap since the ICs on it may be damaged due to static electricity.
Caution:
Before using the antistatic wrist strap, unplug the power cable of the equipment and make
sure that there are no charged objects which are not insulated in the vicinity.

- Be sure not to touch high-temperature sections such as the fuser unit, damp heater and areas
around them.
- Be sure not to touch high-voltage sections such as the chargers, transfer belt, 2nd transfer roller,
developer, high-voltage transformer, and power supply unit. Especially, the board of these
components should not be touched since the electric charge may remain in the capacitors, etc.
on them even after the power is turned OFF.
- Make sure that the equipment will not operate before touching potentially dangerous places (e.g.
rotating/operating sections such as gears, belts pulleys and fans).
- Be careful when removing the covers since there might be the parts with very sharp edges
underneath.
- When servicing the equipment with the power turned ON, be sure not to touch live sections and
rotating/operating sections.
- Use designated jigs and tools.
- Use recommended measuring instruments or equivalents.
- Return the equipment to the original state and check the operation when the service is finished.
- Be very careful to treat the touch panel gently and never hit it. Breaking the surface could cause
malfunctions.
- Do not leave plastic bags where children can get at them. This may cause an accident such as
suffocation if a child puts his/her head into a bag. Plastic bags of options or service parts must be
brought back.
- There is a risk of an electric shock or fire resulting from the damage to the harness covering or
conduction blockage. To avoid this, be sure to wire the harness in the same way as that before
disassembling when the equipment is assembled/disassembled.
3. General operations
- Check the procedures and perform them as described in the Service Manual.
- Make sure you do not lose your balance.
- Avoid exposure to your skin and wearprotective gloves as needed.
4. Important Service Parts for Safety
The breaker, door switch, fuse, thermostat, thermofuse, thermistor, batteries, IC-RAMs including
lithium batteries, etc. are particularly important for safety. Be sure to handle/install them properly. If
these parts are short-circuited and their functions become ineffective, they may result in fatal
accidents such as explosion or fire. Avoid short-circuiting and do not use parts not recommended by
Toshiba Tec Corporation.
5. Cautionary Labels
During servicing, be sure to check the rating plate and cautionary labels such as “Unplug the power
cable during service”, “CAUTION. HOT”, “CAUTION. HIGH VOLTAGE”, “CAUTION. LASER BEAM”,
etc. to see if there is any dirt on their surface and if they are properly stuck to the equipment.
6. Disposal of the Equipment, Supplies and Packing Materials
Regarding the recovery and disposal of the equipment, supplies,packing materials, follow the
relevant local regulations or rules.
7. Batteries and IC RAMs including lithium batteries etc.
CAUTION:
RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE.
DISPOSE OF USED BATTERIES ACCORDING TO THE RELEVANT LOCAL REGULATIONS OR
RULES.

© 2016-2020 Toshiba Tec Corporation All rights reserved GD-1370
CONTENTS
1
CONTENTS
1. SPECIFICATIONS AND OUTLINE OF SYSTEM ......................................................... 1-1
1.1 Fax Options....................................................................................................................... 1-1
1.2 Specifications .................................................................................................................... 1-1
1.3 Features ............................................................................................................................ 1-3
1.4 Accessories and Parts ...................................................................................................... 1-4
1.5 Layout of PC Boards ......................................................................................................... 1-5
2. RECEIVED IMAGE AND RECORDING PAPER SIZE ................................................. 2-1
2.1 Recording Paper Selection and Print Condition Determination Algorithm ........................ 2-1
2.1.1 Recording paper selection algorithm ................................................................. 2-1
2.1.2 Print condition determination algorithm ............................................................. 2-1
2.2 Received Image Size and Recording Paper to be Selected ............................................. 2-5
2.2.1 Table of the recording paper selection mode .................................................... 2-5
2.2.2 Others ................................................................................................................ 2-6
2.3 Energy Saving Mode......................................................................................................... 2-7
2.4 Memory Reception ............................................................................................................ 2-8
3. DIALING/COMMUNICATION CONTROL..................................................................... 3-1
3.1 Circuit Connection and Procedure to Change Mode......................................................... 3-1
3.1.1 Dial call-up transmission to a telephone circuit.................................................. 3-1
3.1.2 Lines to be used and communication mode ...................................................... 3-2
3.1.3 Procedure to select the transmission mode....................................................... 3-2
3.2 Signaling System Diagram and Signal Forms................................................................... 3-3
3.2.1 Circuit control signals......................................................................................... 3-3
3.2.2 Communication with the binary signals ............................................................. 3-4
3.2.3 V.8/V.34 communication sequence ................................................................. 3-12
4. INSTALLATION ............................................................................................................ 4-1
4.1 Explanation to the Users ................................................................................................... 4-1
5. ERROR CODES ............................................................................................................ 5-1
5.1 Transmission/Reception Journal....................................................................................... 5-1
5.2 Status Code List................................................................................................................ 5-2
6. SELF-DIAGNOSIS MODE ............................................................................................ 6-1
7. TROUBLESHOOTING .................................................................................................. 7-1
7.1 Screening Over Telephone ............................................................................................... 7-1
7.2 Recommend Flow Chart for Field Service ........................................................................ 7-2
7.3 Recommend Flow Chart for Telephone Screening ........................................................... 7-3
7.4 Error Analysis Flow ........................................................................................................... 7-6
7.4.1 Self-diagnosis function....................................................................................... 7-6
7.4.2 Precautions for the error analysis ...................................................................... 7-6
7.5 Fault Analysis.................................................................................................................... 7-7
7.5.1 Power-ON is not possible .................................................................................. 7-7
7.5.2 Original transport error for the RADF or DSDF.................................................. 7-7
7.5.3 Recording paper transport error ........................................................................ 7-7
7.5.4 Image trouble..................................................................................................... 7-7
7.5.5 Communication error ......................................................................................... 7-7
7.5.6 Noise is heard when monitor dialing transmission............................................. 7-8
7.6 Lists Required for a Problem in the Field .......................................................................... 7-9
7.6.1 Fax list print mode ............................................................................................. 7-9
7.7 Other Information Required for Error Analysis ................................................................ 7-11
8. PRECAUTIONS FOR INSTALLATION OF FAX BOARD ............................................ 8-1
8.1 When Replacing the Fax Board ........................................................................................ 8-1
8.2 After Replacing the Fax Board .......................................................................................... 8-1

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CONTENTS
2
9. FIRMWARE UPDATING ............................................................................................... 9-1
REVISION RECORD............................................................................................................... 1

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© 2016-2020 Toshiba Tec Corporation All rights reserved GD-1370
SPECIFICATIONS AND OUTLINE OF SYSTEM
1 - 1
1. SPECIFICATIONS AND OUTLINE OF SYSTEM
1.1 Fax Options
The fax function can be used by installing a fax board in the SYS board of the equipment. Up to 2
boards can be installed in the equipment. The secondary board can be used as the 2nd line.
Notes:
Enabling or disabling of the installation of the secondary board and the available size of an
original and recording paper and scanning direction vary depending on the specifications of the
equipment to install.
1.2 Specifications
[A] Main system
Type Desktop type transceiver
Operation Transmission Manual, Automatic
Reception Manual, Automatic
(Including automatic calling to a facsimile
communication network)
[B] Scanning system
Scanning
density
(The values in
[ ] are at the
rotation
transmission.)
Horizontal
direction
16 lines/mm, 8 lines/mm [15.4 lines/mm, 7.7 lines/mm, 3.85 lines/mm]
Vertical
direction
15.4 lines/mm, 7.7 lines/mm, 3.85 lines/mm [16 lines/mm, 8 lines/mm]
Combination
(The values in
[ ] are at the
rotation
transmission.)
Ultra Fine 16 x 15.4 lines/mm [15.4 x 16 lines/mm]
Fine 8 x 7.7 lines/mm [7.7 x 8 lines/mm]
Normal 8 x 3.85 lines/mm [3.85 x 8 lines/mm]
Effective scanning area
(mm)
Original size A B
A4 210 206
B4 364 360
A3 420 416
FOLIO 330 326
LT 216 212
LG 355.6 351.6
LD 431.8 427.8
A
B
2
2
22
Scanning
direction
Fig. 1-1

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SPECIFICATIONS AND OUTLINE OF SYSTEM
1 - 2
[C] Transmission system
Communication mode G3 mode
ECM (Error Correction Mode)
Circuit carrier link equalization
function
Embedded
Output level -16 dBm to -8 dBm
Input level -43 dBm to 0 dBm
Specification of
the
communication
mode
G3 mode ECM
Horizontal
scanning
density
8 lines/mm
300 dpi (reception only)
16 lines/mm
Same as on the left
Vertical
scanning
density
3.85 lines/mm
7.7 lines/mm
300 dpi (reception only)
15.4 lines/mm
Same as on the left
Encoding
system
MH/MR MH/MR/MMR/JBIG
Transmission
speed (image
signal) and
modulation
method
14.4 k /12 k /9600/7200/4800/2400
bps
Conformance to V.17/V.29/V.27 ter
33.6 k / 31.2 k /28.8 k / 19.2 k / 16.8
k / 14.4 k /12 k / 9600/7200/4800/
2400 bps
Control signal 300 bps
V.21
2400/1200/600/300 bps
V.34 / V.8 / V.21
Transmission
control
procedure
Conformance to T.30 Same as on the left
[D] Recording paper
Recording system Electrophotographic recording system
Horizontal scanning density
(recording system)
24 lines/mm (96 lines/mm with the smoothing processing)
[23.1 lines/mm (92.4 lines/mm with the smoothing processing)]
Vertical scanning density
(recording system)
23.1 lines/mm [24 lines/mm]

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SPECIFICATIONS AND OUTLINE OF SYSTEM
1 - 3
1.3 Features
• High-speed transmission
33.6 kbps high-speed modem
JBIG encoding system
• Dual access
By using the memory for transmission and reception, the following operations in which two actions
are performed at the same time become possible.
(1) Memory input during memory transmission
(2) Memory input during memory reception
(3) Copying during memory transmission
(4) Reception of incoming call during copying
(5) Reception of incoming call during memory output
(6) Reception of incoming call during list output
• Gradation
256 tones, error diffusion method
• Memory communication function
Delayed transmission, multi transmission, memory reception and ECM communication can be
performed when image data are stored in the memory.
• Smoothing
The smoothing process is applied to the received images so that they are changed from 8 x 3.85, 8
x 7.7, 8 x 15.4 or 16 x 15.4 to 24 x 92.4 lines/mm (equivalent to 600 x 2400 dpi), then printed out.
• Duplex transmission (when a DF is installed)
Duplex transmission is possible.
• Duplex printing
Duplex printing of received data is possible.
• Fax data file storage capacity
1 GB (sum of transmission and reception)
Notes:
For hard disks, GB means 1 billion bytes.
• Multi-address transmission function
Data can be sent to multiple addresses (*) in sequence in a single operation.
* Up to a total of 400 destinations of addresses which are entered by direct dialing and selected
from single and group addresses registered in the address book
• Memory reception function
When the available recording paper has run out or a paper misfeed has occurred, the memory
receives and stores the data.
• Auto-dialing function
- Delayed dialing
Data are transmitted automatically to the number set at the specified time.
- Redialing
When the recipient’s machine is busy during the automatic dialing, the equipment keeps
dialing at a fixed interval for a specified number of times.

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SPECIFICATIONS AND OUTLINE OF SYSTEM
1 - 4
• Incoming call sound and printing completion sound
The fax data arrival or the completion of the fax data reception can be notified by means of a sound.
•Listoutput
The data such as Phone book number information, Function list, Transmission journal and
Reception journal can be printed out.
• Energy Saver
Data can be received during the Super Sleep mode.
• Mailbox transmission
Relay station mailbox transmission and mailbox transmission/reception using the mailbox are
possible.
• Drawer selection
A drawer to use for printing received fax images can be selected.
1.4 Accessories and Parts
The following accessories and parts come with the fax board.
Modular cable (2 m) 1 pc.
Unpacking/Setup Instructions 1 set

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SPECIFICATIONS AND OUTLINE OF SYSTEM
1 - 5
1.5 Layout of PC Boards
FAX2
FAX1
SYS
LINE1
TEL
LINE2
Fig. 1-2
Symbol Name Function
FAX1 Fax board Fax modem for 1st line
FAX2 MDM board Fax modem for 2nd line
LINE1 LINE1 connector For connecting the cable for line1
LINE2 LINE2 connector For connecting the cable for line2
TEL TEL connector For connecting an external
telephone (EU: N/A)

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SPECIFICATIONS AND OUTLINE OF SYSTEM
1 - 6

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RECEIVED IMAGE AND RECORDING PAPER SIZE
2 - 1
2. RECEIVED IMAGE AND RECORDING PAPER SIZE
2.1 Recording Paper Selection and Print Condition Determination
Algorithm
A received image is evaluated in the following order and then printed.
1. Recording paper selection algorithm
- If recording paper whose size is the same as the one for the received image is not available, this
algorithm determines on which size of recording paper the output should be made.
2. Print condition determination algorithm
- This algorithm determines how the received image is to be printed on the recording paper.
2.1.1 Recording paper selection algorithm
It is possible to distinguish the size of each received image (A3, B4, A4, B5, A5, FOLIO, LD, LG, LT, ST,
COMP). Basically, printing is performed on the recording paper whose size is the same as the one for
the received image. If such recording paper is not available, a larger one is selected. If neither of them
is available, recording paper is selected according to the setting in FS-13-517 (Regular reduction
printing).
2.1.2 Print condition determination algorithm
If the length of the received image is longer than the effective printing area of the recording paper,
printing is performed in the priority order of; discard > vertical reduction > regular size reduction > split.
(For details, see the Discard / Vertical reduction / Regular size reduction / Split printing flow chart.)

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RECEIVED IMAGE AND RECORDING PAPER SIZE
2 - 2
Discard / Vertical reduction / Regular size reduction / Split printing flow chart
Note: Short length paper are the recording paper of A4/B5/A5/LT/
ST against A3/B4/A4/LD/LT size originals respectively.
Yes
Yes
Yes
Yes
Yes Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
START
Is recording paper
whose size is the same as
the one for a received
image available?
Use the short
length paper?
(See the note below.)
Discard
printing function
ON?
Is discarding
within the range?
Discard printing
(actual size)
Vertical reduction
function ON?
Reduction ratio "R" is
calculated by means
of the size of the
received image
"R" within the max.
reduction ratio?
Vertical reduction
printing
Normal printing
(actual size)
Is a smaller
size of recording paper
available?
Regular size
reduction function
ON?
Recording paper
has run out
Is a larger
size of recording paper
available?
Recording paper
has run out.
Regular
size reduction
function ON?
Recording paper
has run out
Regular size
reduction printing
Regular size
reduction function
ON?
Regular size
reduction
printing
Recording paper
has run out
Received image fits in
the effective printing area of the
recording paper?
Regular size
reduction printing
No
Yes
Fig. 2-1

2
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RECEIVED IMAGE AND RECORDING PAPER SIZE
2 - 3
1. Discard printing (FS-13-378 (Rear-end discard printing))
The trailing edge of the received image is cut off by the length specified in the parameter to print the
image in one page in its actual size.
- Images which exceed the effective printing area length will be discarded.
A
B
A
Area B is discarded.
A : Effective printing area length
B : An image outside the effective
printing area
(A + B = Received image)
Fig. 2-2
Notes:
Adjust the discard parameter and vertical reduction parameter so that an image will not be
discarded depending on the data to be received.
2. Vertical reduction printing (FS-13-377 (Reduced printing in vertical direction), FS-13-379 (Maximum
reduction ratio in vertical direction))
The received image is reduced to 75% or 90% only in the vertical direction.
3. Regular size reduction printing (FS-13-517 (Regular reduction printing))
The received image is reduced by “regular to regular” to print it in one page. The combination of
regular size reduction is as below.
A3 →B4 A3 →A4 B4 →A4 B4 →B5
A4 →B5 A4 →A5 B5 →A5 LD →COMP
LD →LT COMP →LT LT →ST
Example 1:
When the length of the received image is within the effective printing area of paper whose size is the
same as that for the received image; however, the same or a larger size of recording paper has run
out
B
A
A × reduction
ratio
B × reduction
ratio
A: Effective printing area length
(= received image length)
B: Effective printing area width
(= received image width)
Fig. 2-3

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RECEIVED IMAGE AND RECORDING PAPER SIZE
2 - 4
Example 2:
When the received image cannot be printed in one page even if both discarding and vertical
reduction have been applied. This example explains the case of applying the “B4 to A4” or “A3 to
A4” reduction since reception of an image has been performed during A4 size selection as its width
B is A4, but its length A has still exceeded the effective printing area even if 75% vertical reduction
has been applied.
A
C
B
D
A × reduction
ratio C × reduction
ratio
B × reduction
ratio
D × reduction
ratio
A: Effective printing area length
B: Effective printing area width
C: Received image length
D: Width of a regular size when
"C" is taken as the long side
(Reduction ratio: A/C)
Fig. 2-4
4. Split printing
When the received image cannot be printed on one page with the largest size of paper set in an
MFP even if vertical reduction is applied, the image reduced is printed by dividing it into two pages.
A× vertical reduction ratio
B× vertical reduction ratio
A
B
A: Effective printing area length
B: Received image length - effective printing area length
Fig. 2-5

2
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RECEIVED IMAGE AND RECORDING PAPER SIZE
2 - 5
2.2 Received Image Size and Recording Paper to be Selected
When FS-13-377 (Reduced printing in vertical direction) is enabled, recording paper is selected in the
following priority order.
1. Recording paper with the same size and direction as those for the received image
2. Recording paper with the same size and different direction from those for the received image
3. Recording paper with a larger size and the same direction as those for the received image
2.2.1 Table of the recording paper selection mode
For the recording paper size to be selected and the priority when FS-13-377 (Reduced printing in
vertical direction) is enabled, see the table below.
A3 A4
A4
A5/A5-R
A5-R
A5-R A5-R A5-R
A4-R
A4-R
A4
A4-R
A4
A4-R
A4-R
A4-RA4-R
A4 A4-R
B4
A3 B4
B4
B5/B5-R
A4-R
A4
B5
B5
B5B5
B5-R
B5-R B5-R
B5
B5-R
B5-R
A3
A3
B5
B5-R
B4
A3
1
2
3
4
5
6
7
8
FOLIO
FOLIO
FOLIO
B4
FOLIO
B4
A3
B4
B4 A4 FOLIO
A3
A3
FOLIO
Size of Original
being Received
Priority
FOLIO FOLIO
The left-hand side indicates the width in a horizontal direction.
* Only when regular size reduction is enabled.

Size of Original
being Received
Priority Ledger Legal
Legal
Legal
Legal
Letter
Letter
Letter
Letter
Letter
Letter
Letter
Letter
Statement
StatementStatement
COMP
Letter
Letter
Statement
Ledger Letter Letter COMP
Ledger
Legal
Legal
COMP
Ledger
Ledger
Letter
Legal
COMP
Letter Letter Letter Ledger
COMP
Ledger
COMP Legal
1
2
3
4
5
6
COMP
Ledger
COMP
Legal
The left-hand side indicates the width in a horizontal direction.
* When regular size reduction is enabled.
** When vertical reduction printing is enabled.
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RECEIVED IMAGE AND RECORDING PAPER SIZE
2 - 6
2.2.2 Others
Adjust the discard parameter and vertical reduction parameter so that an image will not be discarded
depending on the data to be received.

2
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RECEIVED IMAGE AND RECORDING PAPER SIZE
2 - 7
2.3 Energy Saving Mode
The fuser unit, main power and power supply for the control panel can be shut off during the ready state
in a specified period such as night time, using the weekly timer function of the equipment. When a fax is
received in the Energy Saving mode, the equipment recovers from the mode and starts printing.
The setting of the Energy Saving mode and time (start and end time) are made on the USER
FUNCTIONS screen. (The default setting is made by the weekly timer function of the equipment.)
Energy Saving Mode How to enter the mode Timer setting
Auto Power Save Mode Automatically This can be set in the User
Functions screen.
Sleep Mode* Automatically or by pressing the
[ENERGY SAVER] button
This can be set in the User
Functions screen.
Super Sleep Mode* Automatically or by pressing the
[ENERGY SAVER] button
This can be set in the User
Functions screen.
* The equipment is shifted to the Sleep or Super Sleep mode depending on the installed options or
the conditions of the functions used.

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RECEIVED IMAGE AND RECORDING PAPER SIZE
2 - 8
2.4 Memory Reception
The received fax data are stored once in the HDD (memory reception). Then they are printed after the
reception process is finished.
The memory reception can be performed up to 1 GB* at a maximum or done so until the HDD becomes
full.
* Including the transmission data