Brother MFC-8220 Service Manual

MFC-8220
SERVICE MANUAL
4-67
5. GUIDELINES FOR LEAD FREE SOLDER
Information on Manually Repairing PCB Soldered with Lead-Free Solder
This document provides information on how to correctly make manual repairs to a printed circuit
board (PCB) soldered with lead-free solder.
1. Characteristics of lead-free solder
Melting point higher than that of conventional tin-lead solder
(Lead-free solder: approx. 220'C, Conventional tin-lead solder: approx. 180'C)
Relatively poor solder wettability and spread (difficult to wet and spread), and hard
Appearance (dull and grainy surface) different from that of conventional solder
Relatively poor wettability, rough surface (bumps are likely to be formed), and solder
dragging
Poor solder elevation
Poor thermal conductivity and heat resistant (difficult to melt)
2. Metal composition & wire solder
The metal composition of lead-free solder allowed for use on PCBs for Brother's products is
following.
LF
Indication
Compositon Manufacture
r
Origin Name
1
Sn/Ag/Cu Nihon
Genma
Japan DHB-RMA3
NP303
H
only
Component-
side
Sn/Ag/Cu Nihon
Genma
Japan DHB-RMA3
NP303
We use wire solder which is indicated by digit after LF indication on PCB.
Wire solder made in the contries except Japan are under investigation,and will be evaluated.
3. Appearance quality criteria
The appearance of the surface of portions soldered with lead-free solder is basically the
same as that for those soldered with conventional lead-tin solder, except for the following
points.
1) The surface of a portion soldered with lead-free solder is dull and not smooth.
2) Shrinkage cracks can be observed on the surface of a portion soldered with lead-free
solder. (They can be observed using a magnifying glass with approx. 10x
magnification.)
S
h
r
i
n
k
age
cracks
Figure 1 Shrinkage Cracks
4. Identification of lead-free solder on PCBs
For PCBs that use lead-free solder, "LF" is indicated by silk-screen printing or attaching a
label. "LF" stands for lead free and indicates that the PCBs bearing such an indication have
been soldered with lead-free solder. A digit is given in a box following "LF" if produced by
silk-screen printing or follows "LF" without a box on an attached label, the digit indicating the
metal composition and wire solder.

Brother MFC-8220 Specifications

General

Type	all in one
Tray Capacity	250
Automatic Document Feeder Capacity	30 sheets
Paper Size	letter, legal, a4, b5, a5, b6, a6, exe
Paper Handling	up to 250 sheets
Mono Print Speed	21 pages per minute
Print Resolution Mono	up to 2400 x 600
Maximum Number of Pages Per Month	up to 20, 000
Scanner Type	sheetfed
Scan Resolution	up to 300 x 600
Copier Resolution Mono	up to 600
Fax Function	yes
Cartridges	n/a
Number Of Cartridges	2
Internal Memory	yes
Network	not applicable
Connectivity	parallel, usb 2.0
OS Compatibility	pc: windows 95, 98, 98se, me, nt workstation 4.0, 2000 professional or xp, mac: os 8.6 to 9.2, os x 10.1, 10.2.1 to 10.3 or later, available usb 2.0 or parallel port
Mobile Devices Connection	no

Weight and Dimensions

Height	13.2 inches
Width	17 inches
Net Weight	25.6 pounds