Sony IT-B7 - Telephone User manual

– 1 –
SERVICE MANUAL
Canadian Model
E Model
IT-B7
TELEPHONE
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. 510 g
(Approx. 1 lb. 2 oz.)
Supplied accessories Telephone line cords (2) (Canadian)
Telephone line cord (1) (E, SP)
Wall bracket (1) (Canadian)
Design and specifications are subject to change without notice.
• Abbreviation
SP : Singapore model
SPECIFICATIONS
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.
MICROFILM
Photo : Gray type
REVISED

– 2 –
SECTION 1
GENERAL This section is extracted
from instruction manual.

– 3 – – 4 –
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET (LOWER)
3 cabinet (lower)
1 BTP 2.6X6
2 KEY board
3 rubber key switc
h
4 button (12 key)
1 JP2
2 BTP 2.6X6
3 BTP 2.6X6
4 MAIN board
5 modular jack
1 BTP 3X1
0
2 BTP 3X10
2-2. KEY BOARD
2-3. MAIN BOARD

3-1. PRINTEDWIRING BOARDS — Canadian Model —
IT-B7
– 5 – – 6 –
SECTION 3
DIAGRAMS
Q30 F-12
Q31 F-12
Q50 E-8
Q51 E-8
Q52 D-9
Q53 C-7
Q54 D-7
Q55 D-7
U1 C-8
U30 D-11
ZD1 C-9
ZD10 D-11
ZD51 D-10
ZD52 C-8
ZD55 F-13
D1 C-10
D2 C-10
D3 B-10
D4 B-10
D5 B-8
D10
D11 B-11
D12
D13 B-11
D14 D-11
D40 E-13
LED1 G-4
Q10 C-12
Q11 C-11
Q20 D-12
Ref. No. Location
• Semiconductor Location
Ref. No. Location
Note:
•X: parts extracted from the component side.
•: Carbon pattern
•b: Pattern from the side which enables seeing.

3-2. SCHEMATIC DIAGRAM — Canadian Model —
IT-B7
– 7 – – 8 –
• IC Block Diagram
U1 BA8206
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
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.
• Powervoltage is dc12Vand fed withregulateddcpower
supply from JP1 with 100 Ωin series.
• Voltage is dc with respect to ground under no-signal
condition.
no mark : OFF HOOK
( ) : ON HOOK
• Voltages aretakenwithaVOM (Inputimpedance10MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
N: RX
O: TX

– 9 – – 10 –
3-3. PRINTEDWIRING BOARDS — E,Singapore Model —
IT-B7
Q30 F-12
Q50 E-9
Q51 E-9
Q52 D-7
Q53 C-7
Q54 D-7
U1 C-8
U30 E-11
ZD1 B-9
ZD10 D-11
ZD54 E-13
ZD55 E-13
D1 C-10
D2 C-10
D3 B-10
D4 B-10
D5 B-8
D10 C-11
D11 C-11
D12 C-11
D13 C-11
D14 D-11
D50 E-10
D51 E-10
Q10 D-11
Q11 D-12
Ref. No. Location
• Semiconductor Location
Ref. No. Location
Note:
•X: parts extracted from the component side.
•: Carbon pattern
•b: Pattern from the side which enables seeing.

– 11 – – 12 –
3-4. SCHEMATIC DIAGRAM — E, Singapore Model —
IT-B7
• IC Block Diagram
U1 BA8206

– 13 – – 14 –
SECTION 4
EXPLODEDVIEW
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 of Appearance 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.
• Abbreviation
SP : Singapore model
• Accessories and packing materials and
hardware (# mark) list are given in
the last of this parts list.
N
N
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
SECTION 5
ELECTRICAL PARTS LIST
NOTE:
• Due to standardization, replacements in
the parts list may be different from the
parts specified in the diagrams or the
components used on the set.
• -XX and -X mean standardized parts, so
they may have some difference from the
original one.
• RESISTORS
All resistors are in ohms.
METAL:Metal-film resistor.
METAL OXIDE: Metal oxide-film resistor.
F:nonflammable
• Items marked “*” are not stocked since
they are seldom required for routine service.
Some delay should be anticipated
when ordering these items.
• SEMICONDUCTORS
In each case, u : µ, for example:
uA.. : µA.. uPA.. : µPA..
uPB.. : µPB.. uPC.. : µPC.. uPD.. : µPD..
• CAPACITORS
uF : µF
• COILS
uH : µH
1
23
5
4
11
(including X1
)
9
(including JP50)
#1
#1
#2 #2
A
A
8
10
67
#1
JP50
X1
(not supplied)
7
When indicating parts by reference
number, please include the board.
• Abbreviation
SP : Singapore model
KEY MAIN
1 3-025-136-01 HANGER (HANDSET) (GRAY)...(GRAY,BLUE)
1 3-025-136-11 HANGER (HANDSET) (CREAM)
2 3-025-145-03 CABINET (UPPER) (GRAY) (Canadian)
2 3-025-145-13 CABINET (UPPER) (GRAY) (E,SP)
2 3-025-145-43 CABINET (UPPER) (CREAM) (E,SP)
2 3-025-145-63 CABINET (UPPER) (BLUE) (E,SP)
3 3-025-137-01 LEVER (HOOK) (GRAY)...(GRAY,BLUE)
3 3-025-137-11 LEVER (HOOK) (CREAM)
4 1-771-515-11 SWITCH, RUBBER KEY
5 3-025-134-32 BUTTON (12 KEY) (GRAY)...(GRAY,BLUE)
5 3-025-134-42 BUTTON (12 KEY) (CREAM)
*6 1-670-806-11 KEY BOARD (Canadian)
*6 1-670-808-11 KEY BOARD (E,SP)
7 3-025-139-01 FOOT, RUBBER
8 1-765-574-11 CORD, CURL (FOR HANDSET) (CREAM)
8 1-775-798-31 CORD, CURL (FOR HANDSET) (BLUE)
8 1-775-798-41 CORD, CURL (FOR HANDSET) (GRAY)
*9 A-3672-540-A MAIN BOARD, COMPLETE (Canadian)
*9 A-3672-545-A MAIN BOARD, COMPLETE (E,SP)
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-3376-472-1 CABINET (LOWER) ASSY (GRAY) (Canadian)
11 X-3376-473-1 CABINET (LOWER) ASSY (GRAY) (E,SP)
11 X-3376-474-1 CABINET (LOWER) ASSY (CREAM) (E,SP)
11 X-3376-475-1 CABINET (LOWER) ASSY (BLUE) (E,SP)
JP50 1-785-426-11 JACK, MODULAR (4C) 4P (HANDSET)
*1-670-806-11 KEY BOARD (Canadian)
*1-670-808-11 KEY BOARD (E,SP)
**********
< DIODE >
LED1 8-719-072-22 LED SML-310LTT86-MN (HOLD) (Canadian)
*************************************************************
*A-3672-540-A MAIN BOARD, COMPLETE (Canadian)
*A-3672-545-A MAIN BOARD, COMPLETE (E,SP)
*********************
< CAPACITOR >
C1 1-136-193-11 FILM 0.47uF 5% 250V
C2 1-126-964-11 ELECT 10uF 20% 50V
C3 1-163-809-11 CERAMIC CHIP 0.047uF 10% 25V
C4 1-164-182-11 CERAMIC CHIP 0.0033uF 10% 50V
C10 1-164-182-11 CERAMIC CHIP 0.0033uF 10% 50V
C12 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
(E,SP)
C12 1-163-037-11 CERAMIC CHIP 0.022uF 10% 25V
(Canadian)
C13 1-126-934-11 ELECT 220uF 20% 10V
C19 1-128-551-11 ELECT 22uF 20% 25V
C20 1-163-989-11 CERAMIC CHIP 0.033uF 10% 25V
(Canadian)
C21 1-128-551-11 ELECT 22uF 20% 25V
(Canadian)
C37 1-163-001-11 CERAMIC CHIP 220PF 10% 50V
C38 1-163-001-11 CERAMIC CHIP 220PF 10% 50V
C39 1-163-001-11 CERAMIC CHIP 220PF 10% 50V
C40 1-163-001-11 CERAMIC CHIP 220PF 10% 50V
C41 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
C42 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
(Canadian)
C43 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
C44 1-163-251-11 CERAMIC CHIP 100PF 5% 50V
C45 1-163-251-11 CERAMIC CHIP 100PF 5% 50V
C46 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
C47 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
(Canadian)
C48 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
C49 1-163-038-00 CERAMIC CHIP 0.1uF 25V
C50 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
(E,SP)
C50 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
(Canadian)
C51 1-163-011-11 CERAMIC CHIP 0.0015uF 10% 50V
(Canadian)
C51 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
(E,SP)
C52 1-163-037-11 CERAMIC CHIP 0.022uF 10% 25V
(Canadian)
C52 1-163-989-11 CERAMIC CHIP 0.033uF 10% 25V
(E,SP)
C53 1-164-004-11 CERAMIC CHIP 0.1uF 10% 25V
C54 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
(Canadian)
C54 1-163-037-11 CERAMIC CHIP 0.022uF 10% 25V
(E,SP)
C55 1-104-665-11 ELECT 100uF 20% 10V
C56 1-164-182-11 CERAMIC CHIP 0.0033uF 10% 50V
C57 1-126-957-11 ELECT 0.22uF 20% 50V
(E,SP)
C58 1-126-934-11 ELECT 220uF 20% 10V
(E,SP)
C58 1-126-935-11 ELECT 470uF 20% 6.3V
(Canadian)
C59 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
(Canadian)
C59 1-163-017-00 CERAMIC CHIP 0.0047uF 5% 50V
(E,SP)
C60 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
C61 1-164-004-11 CERAMIC CHIP 0.1uF 10% 25V
(Canadian)
C62 1-126-961-11 ELECT 2.2uF 20% 50V
(E,SP)
C64 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
(E,SP)
C70 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
(Canadian)
< DIODE >
D1 8-719-055-76 DIODE 1N4148
D2 8-719-055-76 DIODE 1N4148
D3 8-719-055-76 DIODE 1N4148
D4 8-719-055-76 DIODE 1N4148
D5 8-719-055-76 DIODE 1N4148
D10 8-719-970-02 DIODE 1SR139-400
D11 8-719-970-02 DIODE 1SR139-400
D12 8-719-970-02 DIODE 1SR139-400
D13 8-719-970-02 DIODE 1SR139-400
D14 8-719-991-33 DIODE 1SS133T-77

– 15 –
D40 8-719-991-33 DIODE 1SS133T-77 (Canadian)
D50 8-719-055-76 DIODE 1N4148 (E,SP)
D51 8-719-055-76 DIODE 1N4148 (E,SP)
< FUSE >
F1 1-533-713-11 FUSE (0.5A/125V)
< JACK >
JP1 1-785-419-11 JACK, MODULAR (2C) 6P (LINE)
*JP2 1-566-690-11 PLUG, CONNECTOR (2.5MM) 2P
JP50 1-785-426-11 JACK, MODULAR (4C) 4P (HANDSET)
< JUMPER RESISTOR >
JR30 1-216-295-00 SHORT 0 (Canadian)
JW4 1-216-295-00 SHORT 0
< TRANSISTOR >
Q10 8-729-045-65 TRANSISTOR 2SA1776TV2Q (Canadian)
Q10 8-729-045-66 TRANSISTOR 2SB1236ATV2Q (E,SP)
Q11 8-729-045-48 TRANSISTOR 2SC3415STPP
Q20 8-729-026-41 TRANSISTOR 2SA933AS-QRT (Canadian)
Q30 8-729-026-41 TRANSISTOR 2SA933AS-QRT
Q31 8-729-026-41 TRANSISTOR 2SA933AS-QRT (Canadian)
Q50 8-729-026-41 TRANSISTOR 2SA933AS-QRT
Q51 8-729-026-41 TRANSISTOR 2SA933AS-QRT
Q52 8-729-032-94 TRANSISTOR 2SD1859TV2Q
Q53 8-729-026-41 TRANSISTOR 2SA933AS-QRT
Q54 8-729-026-41 TRANSISTOR 2SA933AS-QRT (E,SP)
Q54 8-729-119-78 TRANSISTOR 2SC2785-HFE (Canadian)
Q55 8-729-119-78 TRANSISTOR 2SC2785-HFE (Canadian)
< RESISTOR >
R1 1-247-717-11 CARBON 2.2K 5% 1/4W
R2 1-247-717-11 CARBON 2.2K 5% 1/4W
R3 1-216-075-00 METAL CHIP 12K 5% 1/10W
R4 1-216-127-11 METAL CHIP 1.8M 5% 1/10W
R5 1-216-100-00 RES,CHIP 130K 5% 1/10W
R6 1-249-417-11 CARBON 1K 5% 1/4W
R7 1-216-073-00 METAL CHIP 10K 5% 1/10W
R8 1-216-097-00 RES,CHIP 100K 5% 1/10W
R10 1-216-089-00 RES,CHIP 47K 5% 1/10W
R11 1-216-025-00 RES,CHIP 100 5% 1/10W
(E,SP)
R11 1-216-035-00 METAL CHIP 270 5% 1/10W
(Canadian)
R12 1-247-863-11 CARBON 22K 5% 1/4W
(Canadian)
R12 1-249-441-11 CARBON 100K 5% 1/4W
(E,SP)
R13 1-216-079-00 METAL CHIP 18K 5% 1/10W
(Canadian)
R13 1-216-113-00 METAL CHIP 470K 5% 1/10W
(E,SP)
R16 1-216-049-11 RES,CHIP 1K 5% 1/10W
(E,SP)
R20 1-249-469-11 CARBON 100K 5% 1/4W
R21 1-216-294-00 METAL CHIP 10M 5% 1/8W
R24 1-216-109-00 METAL CHIP 330K 5% 1/10W
(Canadian)
R25 1-216-689-11 METAL CHIP 39K 0.5% 1/10W
(Canadian)
R26 1-249-441-11 CARBON 100K 5% 1/4W
(Canadian)
R27 1-216-133-00 METAL CHIP 3.3M 5% 1/10W
(Canadian)
R31 1-247-887-00 CARBON 220K 5% 1/4W
(E,SP)
R32 1-247-863-11 CARBON 22K 5% 1/4W
(E,SP)
R33 1-216-037-00 METAL CHIP 330 5% 1/10W
(Canadian)
R36 1-216-097-00 RES,CHIP 100K 5% 1/10W
(Canadian)
R40 1-216-222-00 RES,CHIP 10K 5% 1/8W
R41 1-216-121-00 RES,CHIP 1M 5% 1/10W
R42 1-218-179-11 RES,CHIP 10M 5% 1/10W
R43 1-218-179-11 RES,CHIP 10M 5% 1/10W
(Canadian)
R44 1-216-128-11 RES,CHIP 2M 5% 1/10W
(Canadian)
R45 1-216-133-00 METAL CHIP 3.3M 5% 1/10W
(E,SP)
R46 1-216-121-00 RES,CHIP 1M 5% 1/10W
R47 1-247-887-00 CARBON 220K 5% 1/4W
R49 1-216-065-00 RES,CHIP 4.7K 5% 1/10W
R50 1-216-081-00 METAL CHIP 22K 5% 1/10W
(E,SP)
R50 1-216-214-00 RES,CHIP 4.7K 5% 1/8W
(Canadian)
R51 1-216-051-00 METAL CHIP 1.2K 5% 1/10W
(Canadian)
R51 1-216-055-00 METAL CHIP 1.8K 5% 1/10W
(E,SP)
R52 1-216-113-00 METAL CHIP 470K 5% 1/10W
R54 1-216-033-00 METAL CHIP 220 5% 1/10W
(E,SP)
R54 1-216-198-00 RES,CHIP 1K 5% 1/8W
(Canadian)
R55 1-216-085-00 METAL CHIP 33K 5% 1/10W
R56 1-216-025-00 RES,CHIP 100 5% 1/10W
R57 1-216-057-00 METAL CHIP 2.2K 5% 1/10W
R58 1-216-093-00 METAL CHIP 68K 5% 1/10W
(E,SP)
R58 1-216-094-00 RES,CHIP 75K 5% 1/10W
(Canadian)
R59 1-247-889-00 CARBON 270K 5% 1/4W
(E,SP)
R59 1-247-891-00 CARBON 330K 5% 1/4W
(Canadian)
R60 1-216-053-00 METAL CHIP 1.5K 5% 1/10W
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
MAIN

– 16 –
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
R61 1-216-063-00 RES,CHIP 3.9K 5% 1/10W
R62 1-216-075-00 METAL CHIP 12K 5% 1/10W
R63 1-216-048-00 METAL CHIP 910 5% 1/10W
(Canadian)
R63 1-216-053-00 METAL CHIP 1.5K 5% 1/10W
(E,SP)
R64 1-247-688-11 CARBON 10 5% 1/4W
(Canadian)
R64 1-247-691-11 CARBON 18 5% 1/4W
(E,SP)
R65 1-247-688-11 CARBON 10 5% 1/4W
(Canadian)
R65 1-247-691-11 CARBON 18 5% 1/4W
(E,SP)
R66 1-216-065-00 RES,CHIP 4.7K 5% 1/10W
(Canadian)
R66 1-247-843-11 CARBON 3.3K 5% 1/4W
(E,SP)
R67 1-216-236-11 RES,CHIP 39K 5% 1/8W
(Canadian)
R68 1-216-250-00 RES,CHIP 150K 5% 1/8W
(Canadian)
R69 1-216-093-00 METAL CHIP 68K 5% 1/10W
(E,SP)
R69 1-216-105-00 RES,CHIP 220K 5% 1/10W
(Canadian)
R70 1-216-073-00 METAL CHIP 10K 5% 1/10W
(Canadian)
R71 1-216-308-00 METAL CHIP 4.7 5% 1/10W
(Canadian)
R72 1-249-429-11 CARBON 10K 5% 1/4W
(E,SP)
R73 1-249-421-11 CARBON 2.2K 5% 1/4W
R75 1-216-113-00 METAL CHIP 470K 5% 1/10W
(E,SP)
R76 1-247-899-11 CARBON 680K 5% 1/4W
(Canadian)
R77 1-216-083-00 METAL CHIP 27K 5% 1/10W
(E,SP)
R77 1-247-903-00 CARBON 1M 5% 1/4W
(Canadian)
R78 1-247-703-11 CARBON 180 5% 1/4W
(E,SP)
R79 1-216-070-00 METAL CHIP 7.5K 5% 1/10W
(E,SP)
R79 1-216-081-00 METAL CHIP 22K 5% 1/10W
(Canadian)
< SWITCH >
SW1 1-692-207-21 SWITCH, SLIDE (RINGER LEVEL)
SW20 1-692-494-21 SWITCH, HOOK (HOOK)
SW31 1-572-903-51 SWITCH, SLIDE (DIAL MODE)
SW50 1-692-207-21 SWITCH, SLIDE (HANDSET VOLUME)(Canadian)
< IC >
U1 8-759-081-73 IC BA8206
U30 8-759-559-34 IC LC662204A-4K56
< VIBRATOR >
X30 1-577-306-11 OSCILLATOR, CERAMIC (1MHz)
< DISCHARGE GAP >
Z1 1-517-224-11 GAP, DISCHARGE (Canadian)
Z1 1-801-271-11 VARISTOR (VF07M10820K) (E,SP)
< DIODE >
ZD1 8-719-983-24 DIODE MTZJ-T-77-27C
ZD10 8-719-109-89 DIODE RD5.6ESB2
ZD51 8-719-109-50 DIODE RD2.0ES-B1 (Canadian)
ZD52 8-719-982-99 DIODE MTZJ-T-77-2.4A (Canadian)
ZD54 8-719-109-89 DIODE RD5.6ESB2 (E,SP)
ZD55 8-719-982-11 DIODE MTZJ-4.3B
*************************************************************
MISCELLANEOUS
***************
4 1-771-515-11 SWITCH, RUBBER KEY
8 1-765-574-11 CORD, CURL (FOR HANDSET) (CREAM) (E,SP)
8 1-775-798-31 CORD, CURL (FOR HANDSET) (BLUE) (E,SP)
8 1-775-798-41 CORD, CURL (FOR HANDSET) (GRAY)
*************************************************************
ACCESSORIES & PACKING MATERIALS
********************************
1-696-453-11 CORD (WITH MODULAR PLUG) (LINE) (15cm)
(Canadian)
1-696-454-11 CORD (WITH MODULAR PLUG) (LINE) (215cm)
3-025-324-01 CASE, WALL HOOK (Canadian)
3-864-045-21 MANUAL, INSTRUCTION (ENGLISH,CHINESE)
(E,SP)
3-864-045-31 MANUAL, INSTRUCTION (SPANISH,
PORTUGUESE) (E)
3-864-045-41 MANUAL, INSTRUCTION (ENGLISH,FRENCH)
(Canadian)
*************************************************************
***************
HARDWARE LIST
***************
#1 7-685-533-19 SCREW +BTP 2.6X6 TYPE2 N-S
#2 7-685-547-14 SCREW +BTP 3X10 TYPE2 N-S...(CREAM)
#2 7-685-547-19 SCREW +BTP 3X10 TYPE2 N-S...(GRAY,BLUE)
Sony Corporation
Personal & Mobile Communication Company
9-926-006-12 98I0424-1
Printed in Japan C1998. 9
Published by Quality Assurance Dept.
IT-B7
MAIN