Brother International FAX-170 Service Manual - Page 35

unstabilized

Get Brother International FAX-170 PDF manuals and user guides View all Brother International FAX-170 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 35 highlights

INTM -1 7141 •6 IN 10 .11 ®-1 211 IV RIO IIR es. tioito • I .-- 1.11lIt CFP .-311 7," Oil IOC te..1 1111 FTT -1 C) - 1 „rim. Ire ;IT ll we 6 0 CIO • -- Ght. lie M14 2: . 114 VI Ili 116 MN 220 Ulm .11 elt MLR jr- T16-1- RE- - - 2 11101111 :14,g at... OW I MI 616.0 4 ApIDr J. {1111. WTI .00 '10 4'u" yTel esi Igor . .•11 sit IGa lee • r0 '6 Aft MO :i• TIM 110 1/1 CRT 111 611.1 ITV goaaf se .0 1010 I IC " RN ae " "1471, 6. tNl • ® -3 al 2111.1 CPT Sit IT I I1D- 1 W. Fzr 141 11.14- 1112 1111. ...6 oil, Rfl lo 432 too, Rt 01 .1 RAT 4 I 1111 121 TIM I*I o.0 4 CID • ',IE... (D-2 4 6.. 4 a- en uussse- MAIN #4 Main PCB Circuit Diagram 4/4 @ Connector for the power supply PCB (D-1: CR1, recording head on/off relay ® 3-terminal regulator which eliminates unstabilized components of the +8V source to generate stabilized 5V source. • Connector for the NCU ®-1: Power for the NCU ®-2: Signals from the telephone ® Analog signal selectors ®-1: Selects either input signals from the handset or those from the MODEM. ®-2: Selects either RL1 or RL2 signals inputted from the communications network. ®-3: Selects either sound signals (e.g., alarm beeps, key clicks and ringer sounds) generated by the FAX engine or signals selected by ®-2. ® Amplifier circuit for signals outputted from the MODEM. ® Analog front end IC which processes the analog I/O signals from/to the MODEM. ® Amplifier & shaper circuit for signals inputted from the communications network. ® Telephone circuit for transmitting signals. ® Speaker amplifier circuit which amplifies sounds issued from the above analog signal selector ®-3 and feeds them to the speaker. CI Connector for the speaker @ Speaker volume control circuit 0-1: VOL1 OFF ON ON C)-2: VOL2 OFF OFF ON Speaker volume High Medium Low (ON: Closed OFF: Opened) III - 23

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
  • 191
  • 192
-1
INTM
®-1
.11
211
IV
RIO
IIR
es.
tioito
•
FTT
- 1
7141
IN
10
•6
C)
- 1
„
rim.
Ire
;IT
we
6
0
ll
I
.--
1
.11lIt
CFP
.
1
1
4
Ght.
lie
VI
Ili
M14
2:
.-311
2
7,"
Oil
IOC
te..1
1111
Aft
MO
:i•
.•11
sit
IGa
lee
•
r0
'6
TIM
110
1/1
CRT
111
611.1
ITV
goaaf
se
.0
1
0
1
0
I
IC
220
116
MN
CIO
•
--
.11 elt
MLR
jr—
T16
-
1
—
RE
—
—
—
Ulm
I
MI
616.0
4
ApIDr
J.
.00
{1111.
‘10
WTI
11
101111
:14,g
at...
OW
"
"
RN
ae
"1471,
tNl
6.
Igor
4'u"
T
y
l
ee
i
s
.
®
-3
CPT
Sit
IT
I
I1D-
1
11
12
141
11.14
-
1
11
1.
432
.
..6 oil,
1111
Rfl
lo
too,
Rt
01
.1
RAT
4
I
121
o.0
TIM
I*I
CID
•
2111.1
al
W.
•
',
I
E...
(D
-2
4
6..
4
Fzr
a-
en
uussse-
MAIN
#4
4
Main
PCB
Circuit
Diagram
4/4
@
Connector
for
the
power
supply
PCB
(D-1:
CR1,
recording
head
on/off
relay
®
3
-terminal
regulator
which
eliminates
unstabilized
components
of
the
+8V
source
to
generate
stabilized
5V
source.
•
Connector
for
the
NCU
®-1:
Power
for
the
NCU
®-2:
Signals
from
the
telephone
®
Analog
signal
selectors
®-1:
Selects
either
input
signals
from
the
handset
or
those
from
the
MODEM.
®-2:
Selects
either
RL1
or
RL2
signals
inputted
from
the
communications
network.
®-3:
Selects
either
sound
signals
(e.g.,
alarm
beeps,
key
clicks
and
ringer
sounds)
generated
by
the
FAX
engine
or
signals
selected
by
®-2.
®
Amplifier
circuit
for
signals
outputted
from
the
MODEM.
®
Analog
front
end
IC
which
processes
the
analog
I/O
signals
from/to
the
MODEM.
®
Amplifier
&
shaper
circuit
for
signals
inputted
from
the
communications
network.
®
Telephone
circuit
for
transmitting
signals.
®
Speaker
amplifier
circuit
which
amplifies
sounds
issued
from
the
above
analog
signal
selector
®-3
and
feeds
them
to
the
speaker.
CI
Connector
for
the
speaker
@
Speaker
volume
control
circuit
0-1:
VOL1
OFF
ON
ON
C)-2:
VOL2
OFF
OFF
ON
Speaker
volume
High
Medium
Low
(ON:
Closed
OFF:
Opened)
III
-
23