Samsung ML-7300N Handling Description

10. PortThru (Network Printer Card) Circuit Description

10-1. Introduction

The purpose of the Network Printer Card(PortThru) is to enable the Samsung Printer to function as a network printer.
The PortThru is a plug-in card that plugs into the Samsung Printer. The PortThru provides a Ethernet Local Area
Network interface through which the printer can be connected to the network.

ITEM Description

Novell Netware Version 3.x, 4.x, 5.0
MS Windows Windows 95/98, Windows NT(3.x, 4..x)

Support system

UNIX

AT & T System V(Rel 3.2, Rel 4.2), BSD 4.3 HP-UX(Rel 9.x, Rel 10.x)

SCO 5.x, SUN OS 5.5, SOLARIS 2.5
Macintosh APPLE
Netware IPX/SPX, Pserver, Rprint mode, NDS/Bindery
Windows IPX/SPX, TCP/IP, DLC/LLC

Support protocols UNIX TCP/IP

APPLE EtherTalk Phase 2
Network Management SNMP MIB-II, Private MIB
CPU 32bit RISC controller

Hardware Flash memory 1M byte

RAM 64 Kbyte SRAM / 8M byte DRAM

Interface with

Shared memory 64K byte SRAM

Printer
Logical connection IEEE 802.2 802.3
Attachment 10/100Base-Tx
CPU Samsung NetARM, 33MHz
PHY Chip ICS1892, 25MHz

Flash ROM 1M Byte

Memory

DRAM 8M Byte
SRAM 64K Byte
EEPROM 32K Bit

Printer Interface

NetBridge, 33MHz

60 Pin Connector

Dimension(HxWxD) 15 x 80 x 124mm
Power Consumption Max. 0.6A/ +5Vdc

Product Information

Samsung Electronics 10-1

10-2. Board Description

10-2-1 Configuration of Network Board

Service Part : JC92-01119A

Product Information

Samsung Electronics10-2

10-2-2 Network Board Connector Pin Assignment

Product Information

Samsung Electronics 10-3

Connector Description Pin No. Idle Active In/Out

21, 19, 18, 17, 37, 44,

Addr 0 ~ Addr 15 42, 40, 38, 36, 34, 32 Pulse Pulse I

30, 28, 26, 24

35, 33, 31, 29, 27, 25

Data 0 ~ 15 23, 22, 14, 13, 11, 10 Pulse Pulse I/O

9, 7, 6, 5

nPrnWait 41 +5V DGND O

PRES_L 57 DGND DGND -

nPrnlrq 15 +5V DGND O
nPrnCS 4 +5V DGND I
nPrnRE 50 +5V DGND I

nPrnWE 51 +5V DGND I

nResetIn 39 +5V DGND I

+5V 3, 58, 59, 60 +5V +5V -

DGND 8, 12, 16, 48, 52, 56 DGND DGND -

RxD 1 +5V Pulse I
TxD 2 +5V Pulse O

+5V 3 +5V +5V -

DGND 4 DGND DGND -

Printer Interface

J1

Serial Connector

CN6

10-3 Troubleshooting of Network Card

10-3-1 Troubleshooting Flow Chart

Product Information

Samsung Electronics10-4

Status LED Blinking ?

Does it light up the LEDs?

Turn off power and turn on again in

approx.5 seconds and wait 1 minute.

Go to Power Error

No

Yes

Yes

Yes

Yes

Link LED on ?

Go to System Error

No

Is it possible detecting

using syncThru from PC ?

Is it possible printing

through network ?

Go to Network Error

No

Go to PHY chip Error

No

Go to Shared Memory Interface Error

No

Product Information

Samsung Electronics 10-5

Power Error

Network board's input

voltage = +5V ?

Check the BD1 of the Network Card

Power Error

Go to System Error or Network Error

Section

Go to System Error or Network Error

Section

Replace the board

No

Is it short between

+5V and GND in the

Network board?

No

Yes

Yes

Product Information

Samsung Electronics10-6

System Error

CPU's input

voltage = +5V ?

CPU's pin No. 82

Reset input level = High ?

Check the Network Board

(1) ROM installing ?

(2) Soldering status ?

Check the TMODE(pin no. 63, 64) input

level : Low

Check the EXTMREQ(pin no. 108) input

level : Low

Replace the board

If you can't repair the board

System Error

Check the filter (BD1)

No

Yes

Yes

Yes

Yes

Yes

No

U19(pin no 12)

and U165(pin no 22)'s

Reset input level = High ?

No

CPU(pin no 80)'s

input Clock = 33MHz ?

Check the Y1, R104 and R113

No

U22(pin no 63)'s

input clock = 33MHz ?

No

Check the soldering status

Check the CPU(pin no 77) and R102

Check the U22's pin no. 75

Reset signal :

Nomally High during operation

Check the connector J1's pin no. 39
Check the U22's pin no. 123
Check the U22's pin no. 75

Reset signal :

Nomally High during operation

CPU : U26
NetBridge : U22
Flash ROM : U19
DRAM : U18
PHY Chip : U165

Product Information

Samsung Electronics 10-7

Network Error

U165's input

voltage = +5V ?

U165(pin no 82)'s

Reset input level = High ?

U165(pin no 53)'s

input Clock = 25MHz ?

Check the Network Board

Soldering status ?

Check the R79, R80, R112 and CN5

Check the LED1 and R106

Replace the board

If you can't repair the board

Network Error

Check the filter (L1, L2)

No

Yes

Yes

Yes

No

No

Check the soldering status

Check the Y2, R97 and R105

Check the connector J1's pin no. 39
Check the U22's pin no. 123
Check the U22's pin no. 75

Reset signal :

Nomally High during operation

Product Information

Samsung Electronics10-8

PHY Chip Error

U165's input

voltage = +5V

U165(pin no. 82)'s

Reset input level = High ?

U165(pin no. 53)'s

input clock = 25MHz ?

U165(pin no. 36 and 43)'s

input clock = 2.5MHz or 25MHz ?

Check the Network Board

Solering status ?

Check the RA1, RA10, R138, R144

and R145

Check the LAN Cable

Replace the board

If you can't repair the board

PHY Chip Error

Check the filter (L1, L2)

No

Yes

Yes

Yes

Yes

No

No

Check the Y2, R97 and R105

No

Check the Y2, R97 and R105 and
check the soldering status of U165

Check the connector J1's pin no. 39
Check the U22's pin no. 123
Check the U22's pin no. 75

Reset signal :

Nomally High during operation

Product Information

Samsung Electronics 10-9

Shared Memory Interface Error

U22's input

voltage = +5V ?

U22(pin no. 123)'s

Reset input level = High ?

U22(pin no. 63)'s

input Clock = 33MHz ?

U22(pin no. 65, 66)'s

input level = Low ?

Check the Network Board

Solering status ?

Check the R68, R69, R70, R72,

R73, R92, R127 and R128

Check the J1 connector and DRAM(U18)

Replace the board

If you can't repair the board

Shared Memory Interface Error

Check the filter (BD1)

No

Yes

Yes

Yes

Yes

No

No

Check the Y1 and R102

No

Check the soldering status of the U22

Check the connector J1's pin no. 39

Reset signal :

Nomally High during operation

Product Information

Samsung Electronics10-10

10-3-2 Troubleshooting Table of Network Card

No. Error Type Check List Repair

Power Connection Check the BD1 of Network Card
VCC voltage (nominal is +5V) level Refer to the section of Power Error

1 VCC voltage should be in the range between Troubleshooting

+4.75 and +5.25V
Short between VCC and GND. Repair board
Reset Error : Reset signal is normalhigh during operation
System source clock is 33MHz.

Check point : Y1’s pin 5 and U26’s pin 80 Replace the Y1.
The output clock of U26 is 33MHz. Check the R102 and R122. If these two

2 The input clock of U26 is 33MHz. resistors are OK then replace the board.

Check the ROM Chip select signals
(Pin no U26-75 and U19-26)

Check the DRAM control signals(pin no U26-89, 95, 96,

99, 100 and U18-13, 14, 36, 37, 38)

Reset Error : Reset signal is normal high during operation

Check the Y2, R97 and R105.

The input clock of U165 is 25MHz. If these two resistors are OK then

3 replace the Y2

Check the R79, R80 and R112
Check the output and input signal of U165 of RJ45
connector side. Pin no. 5, 6, 10, 11 of U165.

Check the MII signals between U26 and U165
(Pin no. 30, 31, 32, 33, 34, 35, 36, 37, 38, 42, 43, 44, Refer to the section of PHY chip

4

45, 46, 47, 48, 49, 50) error
Check RA1, RA10, R138, R144 and R145.

The output clock of U26 is 33MHz. Check the R102 and R122. If these two
The input clock of U22 is 33MHz. resistor are OK then replacethe board.

5

Check the Shared Memory Cotrol signals. Refer to the Shared Memory Interface
U22-37, 38, 39 and R68, R69 and R70 Error Section.

The LEDs
does not lit
up

The status
LED does
not blinking

The status
LED is OK
but the
LINK LED
does not lit
up

The two
LEDs are
OK but can’t
detect the
Network
Printer using
SyncThru
from PC

The
SyncThru
can detect
the Network
Printer card
but Printer
does not
printing.