SONY SPP-A973, SPP-974 Service Manual
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SERVICE MANUAL
SPECIFICATIONS
General
Frequency band (SPP-A973)
902 – 928 MHz
Frequency band (SPP-A974)
923.1 – 927.75 MHz
Base unit : 18 µW
Handset : 73 µW
Operating channel
30 channels
Dial signal
Tone, 10 PPS (pulse) selectable
Supplied accessories
AC power adaptor AC-T128 (1)
Telephone line cords (2)
Wall bracket for base phone (1)
Rechargeable battery pack BP-T23 (1)
Handset
Power source
Rechargeable battery pack BP-T23
Battery charging time
Approx. 12 hours
Battery life
Standby: Approx. 7 days
Talk : Approx. 6 hours
Dimensions
Approx. 58 × 177 × 46 mm (w/h/d),
antenna excluded
(approx. 2 3/8 × 7 × 1 13/16 inches)
Antenna: Approx. 72 mm
(approx. 2 7/8 inches)
Mass
Approx. 270 g
(approx. 9.5 oz), battery included
SPP-A973/A974
US Model
SPP-A973
Canadian Model
SPP-A974
CORDLESS TELEPHONE
MICROFILM
Photo: SPP-A973
Base unit
Power source
DC 9 V from AC power adaptor
AC-T128
Battery charging time
Approx. 24 hours
Dimensions
Approx. 160 × 63 × 225 mm (w/h/d),
antenna excluded
(approx. 6 3/8 × 2 1/2 × 8 7/8 inches)
Antenna: Approx. 120 mm
(approx. 4 3/4 inches)
Mass
Approx. 585 g
(approx. 1 lb 5 oz), wall bracket excluded
Answering machine
Maximum recording time
About 15 minutes, using incorporated IC
Greeting message
Up to 90 seconds per each
Incoming and Memo message
Up to 4 minutes per message
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 dam-
aged by heat.
Ver 1.0 1999. 11
SPP-A973/A974
– 25 – – 26 –
4-3. SCHEMATIC DIAGRAM — BASE MAIN SECTION (1/2) —
(Page 27)
Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B) pattern face are indicated.
Parts face side: Parts on the parts face side seen from the
(Side A) parts face are indicated.
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
For schematic diagrams
• All capacitors are in µF unless otherwise noted. pF: µµF
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 9 V and fed with regulated dc power
supply from external power voltage jack. (BASE PHONE)
• Power voltage is dc 12 V and fed with regulated dc power
supply from J1008 with 100 Ω in series. (BASE PHONE)
• Power voltage is dc 3 V and fed with regulated dc power
supply from battery terminal. (HANDSET)
• Voltage is dc with respect to ground under no-signal
condition.
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
N : TX (To Tel Line)
O : RX (From Tel Line)
P : bell
For printed wiring boards
• X : parts extracted from the component side.
• : Carbon pattern.
•
z
: Through hole.
• b : Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
4-4. SCHEMATIC DIAGRAM — BASE MAIN SECTION (2/2) — • Refer to page 45 for IC Block Diagrams.
– 27 – – 28 –
SPP-A973/A974
(Page 35)
(Page 26)
(Page 40)
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