Sony IT-B1 Service Manual

Download this manual

SERVICE MANUAL

MICROFILM

Photo: WHITE Type

SPECIFICATIONS

Dial signal

Tone, 10 PPS (pulse) selectable

Approx. 69 × 74.5 × 225 mm (w/h/d)

Dimensions

(Approx. 2

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.

Central & South America Model

× 3 × 8

inches)

3/4

7/8

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.

IT-B1

Canadian Model

TELEPHONE

Page 1 IT-B1 SERVICE MANUAL Canadian Model Central & South America Model Photo: WHITE Type SPECIFICATIONS Dial signal Tone, 10 PPS (pulse) selectable Approx. 69 × 74.5 × 225 mm (w/h/d) Dimensions × 3 × 8 (Approx. 2 inches) Mass Approx. 485 g (Approx.
Page 2 IT-B1 3-2. SCHEMATIC DIAGRAM — HANDSET SECTION — • Refer to page 7 for IC Block Diagrams. Note: • All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.
Page 3 IT-B1 3-3. PRINTED WIRING BOARD — CRADLE SECTION — 3-4. SCHEMATIC DIAGRAM — CRADLE SECTION — • Semiconductor Location Ref. No. Location Ref. No. Location Note: • All capacitors are in µF unless otherwise noted. pF: µµF Note: 50 WV or less are not indicated except for electrolytics •...
Page 4: Ic Block Diagrams
• IC Block Diagrams IC2 TEA1112AT MIC+ MIC- CIRCUIT CURRENT REFERENCE VOLTAGE CIRCUIT MICRO MUTE DRIVER SLPE MMUTE OTMF MUTE IC3 HM91510AP MODE TONE PULSE CONVERTER GENERATOR INPUT INTERFACE CIRCUIT ROW/COLUMN DECODER PROGRAMMING & INTERFACE CIRCUIT COUNTER DATA LATCH MEMORY KERNEL CONTROL CIRCUIT MEMORY COLUMN...