– 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)