Sony IT-B9 Operating Instructions / Manual de... User manual

– 1 –
SERVICE MANUAL
Canadian Model
E Model
IT-B9
TELEPHONE
MICROFILM
SPECIFICATIONS
Dial signal Tone, 10 PPS (pulse) selectable
Dimensions Approx. 165.5 ×84 ×219 mm (w/h/d)
(Approx. 6 5/8 ×3 3/8 ×8 5/8 inches)
Mass Approx. 530 g
(Approx. 1 lb. 3 oz.)
Supplied accessories Telephone line cords (2) (Canadian)
Telephone line cord (1) (E)
Wall bracket (1) (Canadian)
Design and specifications are subject to change without notice.
Notes on Chip Component Replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Photo : Gray type

3-2. SCHEMATIC DIAGRAM • Refer to page 9 for IC Block Diagrams.
IT-B9
– 7 – – 8 –
Note:
• All capacitors are in µF unless otherwise noted. pF:µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ωand 1/4W or less unless otherwise
specified.
•C: panel designation.
•U: B+ Line.
• Power voltage is dc 12V and fed with regulated dc power
supply from JP1 with 100 Ω in series.
• Voltage is dc with respect to ground under no-signal
condition.
no mark : OFF HOOK
( ) : ON HOOK
• Voltagesare takenwith aVOM(Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
N: RX
O: TX
• Abbreviation
CND : Canadian model.
CAUTION
FOR CONTINUED PROTECTION AGAINST FIRE, RE-
PLACE ONLY WITH SAME TYPE SAME RATING FUSE.
REFER TO SERVICE PERSONNEL. (0.5A/125V)

– 9 – – 10 –
• IC Block Diagrams
U1 BA8206
SECTION 4
EXPLODED VIEW
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
• -XX and -X mean standardized parts, so
they may have some difference from the
original one.
• Color Indication ofAppearance Parts
Example :
KNOB, BALANCE (WHITE) ... (RED)
Parts Color Cabinet’s Color
NOTE:
• The mechanical parts with no reference
number in the exploded views are not supplied.
• Items marked “*” are not stocked since
they are seldom required for routine service.
Some delay should be anticipated
when ordering these items.
• Accessories and packing materials and
hardware (# mark) list are given in
the last of this parts list.
N
N
U80 MC34118DW
6
10
1
23
4
5
9
(including
12, JP50, T80
)
7
7
812
T80
#1
#2
#3 #2
#1
JP50
X1
(not supplied)
#1
SP110
A
A
11
(including X1)
1
2
3
45
6
7
8
LOW
FREQ.
OSC
HIGH
FREQ.
OSC
POWER
SUPPLY
WITH
HYSTERESIS
AMP
VCC
RSL
LFI
LFO
OUT
HFI
HFO
GND
+
28
12 3 4 5 6 7 8 9 10 11 12 13 14
27 26 25 24 23 22 21 20 19 18 17 16 15
–
+–
+–
+–
+–
R
R
400
BIAS
BACK GROUND
NOISE MONITER
BACK GROUND
NOISE MONITER
ATT CONTROL
AGC
LEVEL DET
LEVEL DET
15mV
VR
VR
VR
VR
RX ATT
DP-DET
VCC
R
R
TX ATT
FILTER
GND
FO
FI
CO
Vcc
HTO(+) HTO(–)
NTI
TXO
TXI
WCO
WCI
MUTE
VCL
CT
CPR
PU1
PLO1
TLO1
TU1
RX0 RX1
RLI2
RLO2
TLO2
TLI2
CPT
V8
U110 NJM2113M
5VOUT1
V+
GND
VOUT2
–VIN
+VIN
VREF
CD
–
+
–
+
1
2
3
4
6
7
8
1 3-025-136-01 HANGER (HANDSET) (GRAY) ... (GRAY,BLUE)
1 3-025-136-11 HANGER (HANDSET) (CREAM)
2 3-025-132-01 CABINET (UPPER) (GRAY)
2 3-025-132-11 CABINET (UPPER) (CREAM)
2 3-025-132-21 CABINET (UPPER) (BLUE)
3 3-025-137-01 LEVER (HOOK) (GRAY) ... (GRAY,BLUE)
3 3-025-137-11 LEVER (HOOK) (CREAM)
4 3-025-134-01 BUTTON (12 KEY) (GRAY) ... (GRAY,BLUE)
4 3-025-134-11 BUTTON (12 KEY) (CREAM)
5 1-771-515-11 SWITCH, RUBBER KEY
6 1-765-574-11 CORD, CURL (CREAM)
6 1-775-798-31 CORD, CURL (BLUE)
6 1-775-798-41 CORD, CURL (GRAY)
7 3-025-139-01 FOOT, RUBBER
*8 1-670-811-11 KEY BOARD
*9 A-3672-566-A MAIN BOARD, COMPLETE (Canadian)
*9 A-3672-571-A MAIN BOARD, COMPLETE (E)
10 X-3376-493-1 HANDSET ASSY (GRAY)
10 X-3376-494-1 HANDSET ASSY (CREAM)
10 X-3376-495-1 HANDSET ASSY (BLUE)
11 X-3376-481-1 CABINET (LOWER) ASSY (Canadian:GRAY)
11 X-3376-482-1 CABINET (LOWER) ASSY (E:GRAY)
11 X-3376-483-1 CABINET (LOWER) ASSY (E:CREAM)
11 X-3376-484-1 CABINET (LOWER) ASSY (E:BLUE)
12 3-025-138-01 CAP, MICROPHONE
JP50 1-785-426-11 JACK, MODULAR (4C) 4P (HANDSET)
SP110 1-529-151-11 SPEAKER (5.7cm)
T80 1-542-368-11 MICROPHONE, ELECTRET CONDENSER