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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
1

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John
June 18, 2025

how can you intergtate this sony to be used at this current time and age

Summary of Contents for Sony IT-B1

  • 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...

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