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1

SERVICE MANUAL

SPECIFICATIONS

Dial signal

Tone, 10 PPS (pulse) selectable

Dimensions

Approx. 69 

×

 74.5 

×

 225 mm (w/h/d)

(Approx. 2 

3/4

 

×

 3 

×

 8 

7/8

 inches)

Mass

Approx. 485 g
(Approx. 17 oz), attachments included

Supplied accessories

• Telephone line cords (2)
• Handset cord

Design and specifications are subject to change without notice.

IT-B1

Canadian Model

Central & South America Model

TELEPHONE

MICROFILM

Notes on Chip Component Replacement

Never reuse a disconnected chip component.

Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.

Photo: WHITE Type

Summary of Contents for IT-B1

Page 1: ...achments included Supplied accessories Telephone line cords 2 Handset cord Design and specifications are subject to change without notice IT B1 Canadian Model Central South America Model TELEPHONE MICROFILM Notes on Chip Component Replacement Never reuse a disconnected chip component Notice that the minus side of a tantalum capacitor may be dam aged by heat Photo WHITE Type ...

Page 2: ...erance internal component C panel designation U B Line Connect J2 and J3 with handset cord Power voltage is dc 12V and fed with regulated dc power supply from J3 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 aVOM Input impedance 10 MΩ Voltage variations may be noted due to normal produc tion tolerances Signal pa...

Page 3: ...c power supply from J3 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 aVOM Input impedance 10 MΩ Voltage variations may be noted due to normal produc tion tolerances Signal path N RX from TEL LINE O TX to TEL LINE P bell Note X parts extracted from the component side internal component b Pattern from the side whi...

Page 4: ...VEE MIC MIC IR AGC 15 14 13 12 11 9 10 ROW INTERFACE CIRCUIT COLUMN INTERFACE CIRCUIT DIVIDER OSC KERNEL CONTROL CIRCUIT INPUT INTERFACE CIRCUIT OUTPUT INTERFACE CIRCUIT ROW COLUMN PROGRAMMING COUNTER D A CONVERTER DECODER DATA LATCH PULSE GENERATOR LNB MEMORY 1 C1 2 C2 3 C3 4 C4 VSS VDD 5 KT 6 OSCI 7 OSCO 8 XMUTE 9 VSS 18 R4 17 R3 16 R2 15 R1 14 MODE 12 13 TONE 10 VDD 11 HKS PO MEMORY VDD ...

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