Cisco 3600 Series Quick start guide

1
Doc. No.
Cisco Systems, Inc.
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San Jose, CA 95134-1706
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Cisco Systems, Inc.
Corporate Headquarters
Copyright © 1996
Cisco 3600 Series Memory Upgrade
Configuration Note
Product Numbers:
MEM3600-4FS=, MEM3600-8FS=, MEM3620-4D=, MEM3620-8D=, MEM3620-16D=,
MEM3640-4D=, MEM3640-8D=, MEM3640-16D=, MEM3640-32D=
CPAMEM3600-4FS=, CPAMEM3600-8FS=, CPAMEM3620-4D=, CPAMEM3620-8D=,
CPAMEM3620-16D=, CPAMEM3640-4D=, CPAMEM3640-8D=, CPAMEM3640-16D=,
CPAMEM3640-32D=
This document describes how to upgrade dynamic random-access memory (DRAM) single in-line
memory modules (SIMMs), Flash-memory SIMMs, and read-only memory (ROM) in a Cisco 3620
or Cisco 3640 router.
Note In this document, the term “Cisco 3600 series” refers to the Cisco 3620 and Cisco 3640
routers.
Use this document in conjunction with your router installation and configuration guide and the
Regulatory Compliance and Safety Information document for your router. If you have questions or
need help, refer to the section “Obtaining Service and Support” later in this document.
This document contains the following sections:
•Safety Recommendations, page 3
•Tools and Equipment Required, page 4
•Removing the Cover, page 4
•Upgrading DRAM, page 7
78-3636-01

2Cisco 3600 Series Memory Upgrade Configuration Note
•Upgrading Flash Memory, page 14
•Upgrading the ROM, page 18
•Replacing the Cover, page 21
•Replacing Connections to the Router, page 22
•Obtaining Service and Support, page 23
•Cisco Connection Online, page 23
Warning Only trained and qualified personnel should be allowed to install or replace this
equipment. (To see translated versions of this warning, refer to the Regulatory Compliance and
Safety Information document that accompanied the router.)
Warning Before working on a chassis or working near power supplies, unplug the power cord on
AC units; disconnect the power at the circuit breaker on DC units. (To see translated versions of this
warning,referto the Regulatory Complianceand Safety Informationdocument that accompaniedthe
router.)
Warning Before working on a system that has an on/off switch, turn OFF the power and unplug the
power cord. (To see translated versions of this warning, refer to the Regulatory Compliance and
Safety Information document that accompanied the router.)
The following warning applies to routers with a DC power supply:
Warning Before performing any of the following procedures, ensure that power is removed from
the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that
services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of
the circuit breaker in the OFF position. (To see translated versions of this warning, refer to the
Regulatory Compliance and Safety Information document that accompanied the router.)
Caution To avoid damaging electrostatic discharge (ESD)-sensitive components, ensure that you
have discharged all static electricity from your body before opening the chassis. Before performing
procedures described in this document, review the next section, “Safety Recommendations.”
Note When a procedure refers to the left side or right side of the chassis, it means as viewed from
the front.

Cisco 3600 Series Memory Upgrade Configuration Note 3
Safety Recommendations
Safety Recommendations
Follow these guidelines to ensure general safety:
•Keep the chassis area clear and dust-free during and after installation.
•Place the removed chassis cover in a safe place.
•Keep tools away from walk areas where you or others could fall over them.
•Do not wear loose clothing that may get caught in the chassis. Fasten your tie or scarf and roll up
your sleeves.
•Wear safety glasses when working under conditions that may be hazardous to your eyes.
•Do not perform any action that creates a potential hazard to people or makes the equipment
unsafe.
Warning The ISDN connection is regarded as a source of voltage that should be inaccessible to
user contact. Do not attempt to tamper with or open any public telephone operator (PTO)-provided
equipment or connection hardware. Any hardwired connection (other than by a nonremovable,
connect-one-time-only plug) must be made only by PTO staff or suitably trained engineers. (To see
translated versions of this warning, refer to the Regulatory Compliance and Safety Information
document that accompanied the router.)
Warning The Ethernet 10BaseT, Token Ring, serial, console, and auxiliary ports contain safety
extra-low voltage (SELV) circuits. BRI circuits are treated like telephone-network voltage (TNV)
circuits. Avoid connecting SELV circuits to TNV circuits. (To see translated versions of this
warning,referto the Regulatory Complianceand Safety Informationdocument that accompaniedthe
router.)
Safety with Electricity
Warning Beforeworkingon equipmentthat isconnected topowerlines,removejewelry (including
rings, necklaces, and watches). Metal objects will heat up when connected to power and ground and
can cause serious burns or weld the metal object to the terminals. (To see translated versions of this
warning,referto the Regulatory Complianceand Safety Informationdocument that accompaniedthe
router.)
Follow these guidelines when working on equipment powered by electricity:
•Locate the room’s emergency power-OFF switch. Then, if an electrical accident occurs, you can
quickly shut the power OFF.
•Before working on the system, turn OFF the power and unplug the power cord.
•Disconnect all power before doing the following:
—Working on or near power supplies
—Installing or removing a router chassis or network processor module
—Performing a hardware upgrade
•Do not work alone if potentially hazardous conditions exist.

4Cisco 3600 Series Memory Upgrade Configuration Note
Tools and Equipment Required
•Look carefully for possible hazards in your work area, such as moist floors, ungrounded power
extension cables, and missing safety grounds.
•Never assume that power is disconnected from a circuit. Always check.
•If an electrical accident occurs, proceed as follows:
—Use caution, and do not become a victim yourself.
—Turn off power to the system.
—If possible, send another person to get medical aid. Otherwise, determine the condition of the
victim and then call for help.
—Determine if the person needs rescue breathing or external cardiac compressions; then take
appropriate action.
Preventing Electrostatic Discharge Damage
Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. It occurs when
electronic printed circuit cards are improperly handled and can result in complete or intermittent
failures. Always follow ESD prevention procedures when removing and replacing cards. Ensure that
the router chassis is electrically connected to earth ground. Wear an ESD-preventive wrist strap,
ensuring that it makes good skin contact. Connect the clip to an unpainted surface of the chassis
frame to safely channel unwanted ESD voltages to ground. To properly guard against ESD damage
and shocks, the wrist strap and cord must operate effectively. If no wrist strap is available, ground
yourself by touching the metal part of the chassis.
Caution For safety, periodically check the resistance value of the antistatic strap, which should be
between 1 and 10 megohms (Mohm).
Tools and Equipment Required
You need the following tools and equipment to remove and install SIMMs in a Cisco 3600 series
router:
•Number 1 Phillips screwdriver
•ESD-preventive wrist strap
Removing the Cover
To gain access to memory in a Cisco 3600 series router, you must first remove the chassis cover.
Warning Before working on a chassis or working near power supplies, unplug the power cord on
AC units; disconnect the power at the circuit breaker on DC units. (To see translated versions of this
warning,referto the Regulatory Complianceand Safety Informationdocument that accompaniedthe
router.)

Cisco 3600 Series Memory Upgrade Configuration Note 5
Removing the Cover
Warning Do not touch the power supply when the power cord is connected. For systems with a
power switch, line voltages are present within the power supply even when the power switch is off
and the power cord is connected. For systems without a power switch, line voltages are present
within the power supply when the power cord is connected. (To see translated versions of this
warning,referto the Regulatory Complianceand Safety Informationdocument that accompaniedthe
router.)
The following warning applies to routers with DC power supplies:
Warning Before performing any of the following procedures, ensure that power is removed from
the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that
services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of
the circuit breaker in the OFF position. (To see translated versions of this warning, refer to the
Regulatory Compliance and Safety Information document that accompanied the router.)
Follow this procedure to remove the chassis cover:
Step 1 Turn OFF power to the router.
Warning Before opening the chassis, disconnect the telephone-network cables to avoid contact
with telephone-network voltages. (To see translated versions of this warning, refer to the Regulatory
Compliance and Safety Information document that accompanied the router.)
Warning Do not work on the system or connect or disconnect cables during periods of lightning
activity. (To see translated versions of this warning, refer to the Regulatory Compliance and Safety
Information document that accompanied the router.)
Step 2 Remove all network interface cables from the rear panel.
Step 3 If the router is rack- or wall-mounted, remove it from the rack or wall.
Step 4 Place the router so the front panel is closest to you. Remove the three screws located on
top of the cover near the front edge. (Figure 2 shows these screws for the Cisco 3620
cover, and Figure 3 shows the screws for the Cisco 3640 cover.) Set the screws aside in a
safe place.
Step 5 Lift the front edge of the cover about 1 inch (2.5 cm) above the chassis, as shown in
Figure 1.

6Cisco 3600 Series Memory Upgrade Configuration Note
Removing the Cover
Figure 1 Lifting the Cover
Step 6 Pull the cover toward you until the metal tabs on the rear edge separate from the chassis
bottom. (See Figure 2 for the Cisco 3620 and Figure 3 for the Cisco 3640.)
Figure 2 Removing the Cisco 3620 Cover
H7242
Screw
PCMCIA
0
ACTIVE
READY
1
1
0
SYSTEM
CON AUX
RPS
H7241
Screw
PCMCIA
0
ACTIVE
READY
1
1
0
SYSTEM
CON AUX
RPS

Cisco 3600 Series Memory Upgrade Configuration Note 7
Upgrading DRAM
Figure 3 Removing the Cisco 3640 Cover
Step 7 Lift the cover free and set it aside.
When you are ready to replace the cover, refer to the section “Replacing the Cover” later in this
document.
If you are replacing DRAM SIMMs, continue with the next section, “Upgrading DRAM.” If you are
upgrading your Flash memory, continue with the section “Upgrading Flash Memory” later in this
document.
Upgrading DRAM
This section describes how to upgrade DRAM on the system card. You might need to upgrade
DRAM for the following reasons:
•You have upgraded to a new Cisco Internetwork Operating System (Cisco IOS) feature set or
release.
•You are using very large routing tables or many protocols (for example, when the router is set up
as part of both a large external network and your internal network).
Cisco 3620 DRAM
The Cisco 3620 router contains four 72-pin single SIMM sockets (or banks) for DRAM, numbered
0 through 3. (See Figure 4.) Each socket can be filled with a single 32-bit-wide, 72-pin DRAM
SIMM. You can use the memory-size iomem software command to configure DRAM as a mixture
of shared memory, which is used for data transmitted or received by network modules and WAN
interfacecards, and primary or main memory, which is reservedfor the CPU. For further information
about this command, refer to the Cisco IOS configuration guides and command references.
Note DRAM in the Cisco 3620 supports only single-bank SIMMs and 32-bit operation.
H7043
Screw
0
ACTIVE
READY
123
PCMCIA
1
0
SYSTEM CON AUX
RPS

8Cisco 3600 Series Memory Upgrade Configuration Note
Upgrading DRAM
Figure 4 Cisco 3620 DRAM SIMM Locations
Only certain combinations of DRAM SIMMs are permitted. These combinations are shown in
Table 1. (Memory configurations that are too small to run the Cisco IOS software are not shown.)
Table 1 Cisco 3620 32-Bit-Wide DRAM Configurations
Bank 0
(SIMM 0)
(MB)
Bank 1
(SIMM 1)
(MB)
Bank 2
(SIMM 2)
(MB)
Bank 3
(SIMM 3)
(MB)
Total
Memory
(MB)
444–12
4 81– – 12
448–16
4 16 – – 20
84––12
88––16
8 16 – – 24
884–20
888–24
884424
884828
888428
8 8 16 – 32
H7317
DRAM SIMMs
0 1 2 3

Cisco 3600 Series Memory Upgrade Configuration Note 9
Upgrading DRAM
Cisco 3640 DRAM
The Cisco 3640 router contains four 72-pin SIMM sockets or banks for DRAM, numbered 0 through
3. (See Figure 5.) Each socket can be filled with a single 32-bit-wide, 72-pin DRAM SIMM. You
can configure DRAM in software as a mixture of shared memory, which is used for data transmitted
or received by network modules and WAN interface cards, and primary or main memory, which is
reserved for the CPU. For further information, refer to the Cisco IOS configuration guides and
command references.
You can configure DRAM in the Cisco 3640 router to be either 32 bits wide or 64 bits wide. The
64-bit mode can use both single-bank and dual-bank SIMMs. To use 64-bit mode, you must install
DRAM SIMMs in pairs of the same size.
Note In 32-bit mode, the router performs approximately 20 percent slower than when DRAM is
configured for 64-bit mode.
1. 8 = Single-bank SIMM, 8 MB in size.
16 – – – 16
16 4 – – 20
16 8 – – 24
16 16 – - 32
16 16 4 – 36
16 16 8 – 40
16 16 4 4 40
16 16 8 4 44
16 16 4 8 44
16 16 8 8 48
16 16 16 – 48
16 16 16 4 52
16 16 4 16 52
16 16 16 8 56
16 16 8 16 56
16 16 16 16 64
Table 1 Cisco 3620 32-Bit-Wide DRAM Configurations (Continued)
Bank 0
(SIMM 0)
(MB)
Bank 1
(SIMM 1)
(MB)
Bank 2
(SIMM 2)
(MB)
Bank 3
(SIMM 3)
(MB)
Total
Memory
(MB)

10 Cisco 3600 Series Memory Upgrade Configuration Note
Upgrading DRAM
Figure 5 Cisco 3640 DRAM SIMM Locations
Only certain combinations of DRAM SIMMs are permitted. These combinations are shown in
Table 2 for 64-bit configurations, and in Table 3 for 32-bit configurations. (Memory configurations
that are too small to run the Cisco IOS software are not shown.)
Follow these rules to use 64-bit mode DRAM configuration:
•The SIMMs in sockets 0 and 1 must be the same size (in MB) and have the same access time (in
nanoseconds).
•The SIMMs in sockets 2 and 3 must be the same size and have the same access time.
•The size of the SIMMs in sockets 2 and 3 must be less than or equal to the size of the SIMMs in
sockets 0 and 1.
Table 2 Cisco 3640 64-Bit-Wide DRAM Configurations
Bank 0
(SIMM 0)
(MB)
Bank 1
(SIMM 1)
(MB)
Bank 2
(SIMM 2)
(MB)
Bank 3
(SIMM 3)
(MB)
Total
Memory
(MB)
444416
818––16
8 dual28 dual – – 16
884424
8 dual 8 dual 4 4 24
888832
8 8 8 dual 8 dual 32
H7081
DRAM SIMMs
0123

Cisco 3600 Series Memory Upgrade Configuration Note 11
Upgrading DRAM
1. 8 = Single-bank SIMM, 8 MB in size.
2. 8 dual = Dual-bank SIMM, 8 MB in size.
3. 32 dual = Dual-bank SIMM, 32 MB in size.
8 dual 8 dual 8 8 32
8 dual 8 dual 8 dual 8 dual 32
16 16 – – 32
16 16 4 4 40
16 16 8 8 48
16 16 8 dual 8 dual 48
16 16 16 16 64
32 dual332 dual – – 64
32 dual 32 dual 4 4 72
32 dual 32 dual 8 8 80
32 dual 32 dual 8 dual 8 dual 80
32 dual 32 dual 16 16 96
32 dual 32 dual 32 dual 32 dual 128
Table 3 Cisco 3640 32-Bit-Wide DRAM Configurations
Bank 0
(SIMM 0)
(MB)
Bank 1
(SIMM 1)
(MB)
Bank 2
(SIMM 2)
(MB)
Bank 3
(SIMM 3)
(MB)
Total
Memory
(MB)
48––12
4 16 – – 20
444–12
448–16
84––12
8 16 – – 24
884–20
888–24
884828
888428
8 8 16 – 32
16 – – – 16
16 4 – – 20
16 8 – – 24
16 16 4 – 36
Table 2 Cisco 3640 64-Bit-Wide DRAM Configurations (Continued)
Bank 0
(SIMM 0)
(MB)
Bank 1
(SIMM 1)
(MB)
Bank 2
(SIMM 2)
(MB)
Bank 3
(SIMM 3)
(MB)
Total
Memory
(MB)

12 Cisco 3600 Series Memory Upgrade Configuration Note
Upgrading DRAM
DRAM Orientation
SIMMs are manufactured with a polarization notch to ensure proper orientation and alignment holes
to ensure proper positioning. Figure 6 shows the polarization notch and alignment holes on a SIMM
card. Cisco 3600 series DRAM SIMM cards are installed with the connector edge down, the
polarization notch near the front of the chassis, and the component side facing the right side of the
chassis.
Caution To avoid damaging ESD-sensitive components, observe all ESD precautions. To avoid
damaging the motherboard, avoid using excessive force when you remove or replace SIMMs.
Figure 6 Cisco 3600 Series DRAM SIMM
Removing DRAM SIMMs
Follow these steps to remove DRAM SIMMs:
Step 1 Find the DRAM SIMM sockets on the motherboard, as shown in Figure 4 or Figure 5.
Caution Handle SIMMs by the card edges only. SIMMs are ESD-sensitive components and can be
damaged by mishandling.
16 16 8 – 40
16 16 4 8 44
16 16 4 16 52
16 16 8 4 44
16 16 8 16 56
16 16 16 – 48
16 16 16 4 52
16 16 16 8 56
Table 3 Cisco 3640 32-Bit-Wide DRAM Configurations (Continued)
Bank 0
(SIMM 0)
(MB)
Bank 1
(SIMM 1)
(MB)
Bank 2
(SIMM 2)
(MB)
Bank 3
(SIMM 3)
(MB)
Total
Memory
(MB)
Alignment holes
Connector edge Polarization notch
H2407

Cisco 3600 Series Memory Upgrade Configuration Note 13
Upgrading DRAM
Step 2 Remove one SIMM at a time, beginning with the SIMM in bank 3. To lift the SIMM out
of its socket, pull the locking spring clips on both sides outward and tilt the SIMM toward
the right side of the chassis, free of the clips. (See Figure 7.)
Figure 7 Removing DRAM SIMMs
Step 3 Holdthe SIMMby theedges withyour thumband indexfingerand liftit outof thesocket.
Place the removed SIMM in an antistatic bag to protect it from ESD damage.
Step 4 Repeat Step 2 and Step 3 for each SIMM.
Installing DRAM SIMMs
Follow this procedure to install DRAM SIMMs:
Step 1 Find the DRAM SIMM sockets on the motherboard, as shown in Figure 4 or Figure 5.
Caution Handle SIMMs by the card edges only. SIMMs are ESD-sensitive components and can be
damaged by mishandling.
Step 2 Hold the SIMM with the polarization notch on the right, near the front of the chassis, and
the component side away from you, with the connector edge at the bottom. (See
Figure 6.)
Step 3 Beginning with bank 0, insert the SIMM into the connector slot at an angle, tilted toward
the right side of the chassis. Rock the SIMM into a vertical position (see Figure 8), using
the minimum amount of force required. When the SIMM is properly seated, the socket
guide posts fit through the alignment holes, and the connector springs click into place.
Step 4 Ensure that each SIMM is straight and that the alignment holes (as shown in Figure 7)
line up with the plastic guides on the socket.
2. Push the top of the
SIMM forward and down.
1. Pull the locking spring clips outward. SIMM 
polarization
notch
Top view
Front of chassis
H7038

14 Cisco 3600 Series Memory Upgrade Configuration Note
Upgrading Flash Memory
Figure 8 Installing DRAM SIMMs
Caution It is normal to feel some resistance, but do not use excessive force on the SIMM, and do
not touch the surface components.
Step 5 Repeat Step 2 through Step 4 for each SIMM.
If you are finished replacing SIMMs, continue with the section “Replacing the Cover” later in this
document.
Upgrading Flash Memory
Cisco 3600 series routers contain one or two 80-pin Flash-memory SIMMs for storing the system
software image. These SIMMs are not interchangeable with DRAM SIMMs. You can upgrade Flash
memory by replacing the existing 4-MB SIMM with an 8-MB SIMM or by adding a SIMM to the
second Flash-memory socket.
SIMMs are manufactured with a polarization notch to ensure proper orientation and alignment holes
to ensure proper positioning, similar to those shown in Figure 9. Cisco 3600 series Flash SIMM
cards are installed with the connector edge down, the polarization notch near the front of the chassis,
and the component side facing the right side of the chassis.
Figure 9 Flash-Memory SIMM Orientation and Alignment
H7037
1. Insert the SIMM into the socket 
at an angle from vertical.
The socket guide posts fit through 
the holes in the SIMM.
3.
The locking springs clip the back
of the SIMM.
4.
View from front of chassis
2. Push the top of the SIMM 
down and back.
Alignment holes
Connector edge Polarization notch
H2407

Cisco 3600 Series Memory Upgrade Configuration Note 15
Upgrading Flash Memory
Caution To avoid damaging ESD-sensitive components, observe all ESD precautions. To avoid
damaging the motherboard, avoid using excessive force when you remove or replace SIMMs.
Removing Flash-Memory SIMMs
Follow this procedure to remove an existing Flash-memory SIMM:
Step 1 Put on an ESD-preventive wrist strap and ensure that it makes good contact with your
skin. Connect the equipment end of the wrist strap to the metal backplate of the chassis,
avoiding contact with connectors.
Step 2 Find the Flash-memory SIMM sockets on the router motherboard. (See Figure 10 and
Figure 11.)
Figure 10 Cisco 3620 Flash Memory Locations
H7318
Flash memory SIMMs

16 Cisco 3600 Series Memory Upgrade Configuration Note
Upgrading Flash Memory
Figure 11 Cisco 3640 Flash Memory Locations
Caution Handle SIMMs by the card edges only. SIMMs are ESD-sensitive components and can be
damaged by mishandling.
Step 3 To lift the Flash-memory SIMM out of its socket, pull the locking spring clips on both
sides outward and tilt the SIMM toward the left side of the chassis, free of the clips. (See
Figure 12.)
H7082
Flash memory SIMMs

Cisco 3600 Series Memory Upgrade Configuration Note 17
Upgrading Flash Memory
Figure 12 Removing Flash-Memory SIMMs
Installing Flash-Memory SIMMs
Follow this procedure to install Flash-memory SIMMs:
Step 1 Find the Flash-memory SIMM sockets on the Cisco 3600 series motherboard.
(See Figure 10 and Figure 11.)
Caution Handle SIMMs by the edges only. SIMMs are ESD-sensitive components and can be
damaged by mishandling.
Step 2 Hold the SIMM with the polarization notch on the right and the component side away
from you, with the connector edge at the bottom.
Step 3 Referring to Figure 13, insert the Flash-memory SIMM into its connector slot at an angle,
tilted toward the left side of the chassis. Rock the SIMM into a vertical position, using the
minimum amount of force required. When the SIMM is properly seated, the socket guide
posts fit through the alignment holes, and the locking springs click into place. Use the
minimum amount of force required.
2. Push the top of the SIMM 
forward and down.
1. Pull the locking spring clips outward.
SIMM polarization notch
Top view
Front of chassis
H7085

18 Cisco 3600 Series Memory Upgrade Configuration Note
Upgrading the ROM
Figure 13 Inserting Flash-Memory SIMMs
Caution It is normal to feel some resistance, but do not use excessive force on the SIMM and do
not touch the surface components to avoid damaging them.
Step 4 Check the alignment of each SIMM to make sure that it is straight and that the alignment
holes are lined up with the plastic socket guides.
If you are finished replacing SIMMs, continue with the section “Replacing the Cover” later in this
document.
Upgrading the ROM
To upgrade the Cisco 3600 series firmware to a new ROM monitor, you must replace the existing
ROM.
In addition to the tools described in the section “Tools and Equipment Required” earlier in this
document, you also need:
•A ROM extraction tool or small flat-blade screwdriver
•Needlenose pliers
Caution Correct placement of the ROM is crucial. If improperly positioned, the new component
could be damaged when the router is powered on. Read all instructions before proceeding. To
prevent damage to the ROM from ESD, follow the ESD procedures described in the section
“Preventing Electrostatic Discharge Damage” earlier in this document. Be careful not to damage or
scratch the printed circuit card under the ROM.
H7084
1. Insert the SIMM into the socket 
at an angle from vertical.
The socket guide posts fit through 
the holes in the SIMM.
3.
The locking springs clip the back
of the SIMM.
4.
View from front of chassis
2. Push the top of the SIMM 
down and back.

Cisco 3600 Series Memory Upgrade Configuration Note 19
Upgrading the ROM
Follow these steps to replace the ROM:
Step 1 Locate the ROM on the motherboard. (See Figure 14 and Figure 15.)
Figure 14 Cisco 3620 ROM Location
Step 2 Gentlyremovethe old ROM with a ROM extractiontool ora smallflat-blade screwdriver,
and set it aside.
Step 3 Insertthe newROM inits socketin the orientation shownin Figure 14or Figure 15,being
careful not to bend or crush any of the bottom pins. To straighten out a bent pin, use
needlenose pliers. Align the notch in the new ROM with the notch in the ROM socket,
ignoring the orientation of the label.
Caution Thenotch onthe ROMmustmatch thenotch on thesocket on thecard. Installingthe ROM
backward will damage it.
When you are finished replacing the ROM, continue with the section “Replacing the Cover” later in
this document.
H7319
ROM

20 Cisco 3600 Series Memory Upgrade Configuration Note
Upgrading the ROM
Figure 15 Cisco 3640 ROM Location
Testing ROM Installation
Test your ROM installation by rebooting the router. If you installed the ROM correctly, the router
boots into the ROM monitor or operating system.
Follow these steps if you suspect that the ROM is inserted incorrectly:
Step 1 Remove the cover, as described in the section “Removing the Cover” earlier in this
document.
Step 2 Gentlyremovethe old ROM with a ROM extractiontool ora smallflat-blade screwdriver,
and set it aside.
Step 3 Use needlenose pliers to straighten any bent pins on the ROM.
Step 4 Insertthe newROM inits socketin the orientation shownin Figure 14or Figure 15,being
careful not to bend or crush any of the bottom pins. Align the notch in the new ROM with
the notch in the ROM socket, ignoring the orientation of the label.
Step 5 Replace the cover, as described in the next section, “Replacing the Cover.”
Step 6 Try booting the router again.
If the problem persists, refer to the section “Obtaining Service and Support” later in this document.
H7083
ROM