– 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

µ

F unless otherwise noted. pF:

µµ

F

50 WV or less are not indicated except for electrolytics
and tantalums.

• All resistors are in

Ω

and

1

/

4

W or less unless otherwise

specified.

•

C

: panel designation.

•

U

: B+ Line.

• Power voltage is dc 12 V 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

• Voltages are taken with a VOM (Input impedance 10 M

Ω

).

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 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.

• Accessories and packing materials and

hardware (# mark) list are given in
the last of this parts list.

N

N

U80 MC34118DW

6

10

1

2

3

4

5

9

(including
12, JP50, T80)

7

7

8

12

T80

#1

#2

#3

#2

#1

JP50

X1
(not supplied)

#1

SP110

A

A

11

(including X1)

1

2

3

4

5

6

7

8

LOW

FREQ.

OSC

HIGH

FREQ.

OSC

POWER

SUPPLY

WITH

HYSTERESIS

AMP

VCC

RSL

LFI

LFO

OUT

HFI

HFO

GND

+

28

1

2

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

5

VOUT1

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