Sony SPP-A945 Service manual
SPP-A945
SERVICE MANUAL
Ver 1.1 2000. 03
SPECIFICATIONS
US Model
MICROFILM
CORDLESS TELEPHONE
WITH ANSWERING SYSTEM
TABLE OF CONTENTS
1. GENERAL
Setting up the base phone ............................................... 3
Prepairing the battery pack ............................................. 3
Making calls .................................................................... 4
Receiving calls ................................................................ 4
Speed dialing ................................................................... 5
Setting the ringer type..................................................... 5
Switching the phones during a call................................. 6
Talking between the handset and
the base phone (Intercom) .............................................. 6
Having a three-way conference ...................................... 7
Setting up the answering machine .................................. 7
Playing back messages.................................................... 8
Selecting the Announcement Only Mode....................... 9
Screening calls ................................................................ 9
Recording a memo message ........................................... 9
Operating from an outside phone ................................... 9
Mounting the base phone on a wall ................................ 10
2. DISASSEMBLY ......................................................... 11
3. TEST MODE
3-1. Base Unit ......................................................................... 13
3-2. Handset ............................................................................ 14
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.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED
LINE WITH MARK ! ON THE SCHEMATIC DIA GRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANU AL OR IN SUPPLEMENTS PUBLISHED BY SONY.
4. ELECTRICAL ADJUSTMENTS
4-1. Base Unit Section............................................................ 15
4-2. Handset Section............................................................... 16
5. DIAGRAMS
5-1. Block Diagram – BASE UNIT Section (1/2) –.............. 17
5-2. Block Diagram – BASE UNIT Section (2/2) –.............. 19
5-3. Block Diagram – HANDSET Section – ......................... 21
5-4. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 23
5-5. Printed Wiring Board
– BASE MAIN Board (Side A) – ................................... 25
5-6. Printed Wiring Board
– BASE MAIN Board (Side B) – ................................... 27
5-7. Schematic Diagram
– BASE MAIN Section (1/2) –....................................... 29
5-8. Schematic Diagram
– BASE MAIN Section (2/2) –....................................... 31
5-9. Printed Wiring board
– DSP Section – .............................................................. 33
5-10. Schematic Diagram
– DSP Section – .............................................................. 35
5-11. Printed Wiring board
– BASE KEY Section – .................................................. 37
5-12. Schematic Diagram
– BASE KEY Section – .................................................. 38
5-13. Schematic Diagram
– HAND MAIN Section – .............................................. 39
5-14. Printed Wiring board
– HAND MAIN Section – .............................................. 41
5-15. Printed Wiring board
– SHEET SWITCH Section –......................................... 43
5-16. IC Pin Function Description ........................................... 48
6. EXPLODED VIEWS ................................................. 52
7. ELECTRICAL PARTS LIST.................................. 54
– 2 –
SECTION 1
GENERAL
This section is extracted from
instruction manual.
– 3 –
– 4 –
– 5 –
– 6 –
– 7 –
– 8 –
– 9 –
– 10 –
SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
• HANDSET
HAND CABINET (REAR)
5
Remove the hand cabinet (rear)
to direction of the arrow B.
3
two claws
4
claw
3
two claws
HAND MAIN BOARD
B
2
two screws
(BTP3 × 12)
A
1
Remove the battery case lid
to direction of the arrow A.
3
2
washer
antenna
(ANT 2)
1
two screws
(BTP3
×
10)
5
Remove the HAND MAIN board
to direction of the arrow C.
C
4
four screws
(P2 × 5)
– 11 –
• BASE UNIT
)
l
BASE CABINET (UPPER) ASS’Y
1
three screws
×
12)
(BTP3
2
two claws
3
base cabinet (upper) ass’y
1
two screws
(BTP3
×
12
BASE MAIN BOARD
1
two connectors
(J13,16)
2
two screws
(BTP2.6
4
BASE MAIN board
×
8)
knob (slide R)
2
screw
(BTP2.6
S1
knob (slide D)
Note: On installation BASE MAIN
×
8)
3
ring termina
S2
board adjust the S1, S2 and knob
(slide D), knob (slide R)
– 12 –
SECTION 3
TEST MODE
3-1. BASE UNIT
[Start-up]
1. When po wered up, press and hold [#] and [3] keys at the same
time for 1 - 2 seconds.
2. Then press [*] and [1] keys at the same time.
3. Release and press again
testmode, and happy tone is emitted.
Default setting:
• Channel No. = 6
• Fast charge enable (FST_CHG = 1)
• RX audio unmute (RX_MUTE = 1)
• TX audio unmute (TX_MUTE = 1)
• 3 way Conf. mode
[Key functions]
The base unit always monitors the key inputs, and generates a key
touch tone and goes in the following modes according to each key
pressed.
[#] and [3] at the same time to enter
[SPEAKERPHONE] key
• Toggle the mode to 4 item in the following sequence and
status.
↓
3 way conf. mode
↓
H/S only mode
↓
Intercom mode
↓
SPKR mode
[INTERCOM] key
• Toggle mic mute signal ON/OFF (U12 !™ pin).
• CHARGE LED is ON at mic mute enable, off at mic mute
disable.
[VOLUME+], [VOLUME–] key
• Change speaker volume (8 steps).
• Key tone will be emitted each time and 3 times volume key
deep will be emitted when volume reach maximum or minimum.
[SPEEDDIAL] key
• Toggle fast charge.
• CHARGE LED is ON at fast charge enable, off at f ast charge
disable. (After press [SPEEDDIAL].)
[REDIAL/PAUSE] key
• Toggle RX m ute signal ON/OFF (U6 !§ pin).
[HOLD] key
• Toggle transmit data ON/OFF (DATA = #1 LINK_ACK =
#$9E).
• SPEAKERPHONE LED is ON at transmitting data, OFF at
no data transmission.
[TALK/FLASH] key
• Increment channel number of every press the key.
• Refresh PLL REF, RX, TX counters.
[5] key
• Toggle gener ation of DTMF digit 5 continuously.
• Side tone is emitted continuously , until press [5] once again.
ITEM mode mode mode mode
MODE 3 way conf. H/S only Intercom SPKR
TX_ENABLE 0 0 0 1
TEL_SW 1 1 0 1
SP_SW 1 0 1 1
MIC_MUTE 0 1 0 0
SPK_MUTE 0 1 0 0
OFF_HOOK 0 0 1 0
IN_USE ON ON ON OFF
LEDS INTERCOM ON ON OFF ON
SPKR ON OFF ON ON
CHARGE OFF ON OFF OFF
[*] key
• Exit test mode and reset the MCU.
[LED indication]
• IN_USE : ON = TX power enable (TX_ENABLE = 0)
OFF = TX power disable (TX_EN ABLE = 1)
• INTERCOM : ON = TEL_SW on (1)
OFF = TEL_SW off (0)
• SPEAKER : ON = SP_SW on (1)
PHONE OFF = SP_SW off (0)
• CHARGE : ON = Mic mute enable (MIC_MUTE = 1)
OFF = Mic mute disable (MIC_MUTE = 0)
– 13 –
3-2. HANDSET
[Start-up]
1. When powered up, press and hold [#] and [3] at the same time
for 1 - 2 seconds.
2. Then press [*] and [1] at the same time.
3. Release and press again [#] and [3] at the same time to enter
testmode, and happy tone is emitted.
Default setting:
• Channel No. = 6
• PLL gain mode lowest
• TX attenuater off
• TX power on (\TX_ENABLE = 0)
• RX power on (\RX_ENABLE = 0)
• TX audio unmute (\TX_MUTE = 1)
• RX audio unmute (\RX_MUTE = 1)
[Key functions]
The handset always monitors the key inputs, and generates a key
touch tone and goes in the following modes according to each key
pressed.
[CHANNEL] key
• Increment channel number of every press the key.
• Refresh PLL RX, TX counters.
[SPEEDDIAL] key
• Toggle TX po wer.
• Refresh PLL TX counter.
[REDIAL/PAUSE] key
• Toggle RX power.
• Refresh PLL REF, RX, TX counters.
[PGM] key
• Toggle TX attenuater.
• Refresh PLL status register.
[TALK/FLASH] key
• Change PLL gain mode.
• Increment PLL gain of every press the key. (All 4 steps)
[HOLD] key
• Toggle TX mute.
[INTERCOM] key
• Toggle RX mute.
[OFF] key
• Quit test mode.
• Emits sad tone.
[LED indication]
• IN_USE : ON = TX power on
(TALK) OFF = TX power off
• BATT LOW : ON = RX power on
OFF = RX power off
• INTERCOM: ON = TX attn off
OFF = TX attn on
– 14 –
SECTION 4
)
)
)
)
)
)
)
)
ELECTRICAL ADJUSTMENTS
4-1. BASE UNIT SECTION
• Make the set in Test Mode (See page 13)
1. TX LOOP VOLTAGE check
Setting:
digital voltmeter
+
–
Precedure:
• Connect a voltmeter to TP4 (TX-LOOP-V OLTAGE) and GND.
• Check the value of voltmeter is 1.4 ± 0.6 V.
2. TX POWER check
Setting:
level meter
+
–
Precedure:
• Connect a level meter to TP (ANT) and GND.
• Check the level of level meter is –5 ± 0.5 dB.
Adjustment Location:
TP4 (TX-LOOP-VOLTAGE
GND
TP (ANT
GND
3. RX LOOP VOLTAGE check
Setting:
digital voltmeter
+
–
TP3 (RX-LOOP-VOLTAGE
GND
Precedure:
• Connect a voltmeter to TP3 (RX-LOOP-V OLTA GE) and GND.
• Check the value of voltmeter is 1.4 ± 0.6 V.
4. QUAD-TUNE VOLTAGE adjustment
Setting:
digital voltmeter
+
–
U1
GND
!¢
Precedure:
• Connect a voltmeter to U1 !¢ and GND.
• Adjust C151 so that QUAD-TUNE VOLTAGE is 2.2 ± 0.1 V.
4-2. HANDSET SECTION
• Make the set in test mode (See page 14)
1. TX LOOP VOLTAGE check
Setting:
digital voltmeter
+
–
Precedure:
• Connect a voltmeter to J2 (TX-LOOP-VOLTAGE) and J2
(GND).
• Check the value of voltmeter is 0.8 ± 0.4 V.
2. TX POWER check
Setting:
level meter
+
–
Precedure:
• Connect a level meter to TP (ANT) and J2 (GND).
• Check the level of level meter is –5 ± 2.5 dB.
J2 (TX-LOOP-VOLTAGE
J2 (GND)
TP (ANT
J2 (GND
3. RX LOOP VOLTAGE check
Setting:
frequency counter
+
–
J2 (RX-LOOP-VOLTAGE
J2 (GND)
Precedure:
• Connect a frequency counter to J2 (RX-LOOP-VOLT A GE) and
J2 (GND).
• Check the value of voltmeter is 0.8 ± 0.4 V.
4. QUAD-TUNE VOLTA GE adjustment
Setting:
digital voltmeter
+
–
J2 (RX AUDIO
J2 (GND)
Precedure:
• Connect a voltmeter to J2 (RX AUDIO) and J2 (GND).
• Adjust C87 so that QUAD-TUNE VOLTAGE is 1.2 ± 0.075 V.
[BASE MAIN Board] (SIDE A)
TP
(ANT)
[BASE MAIN Board] (SIDE B)
U3
U1
C151
14
F3
U12
Adjustment Location:
[HAND MAIN Board] (SIDE A)
TP (ANT)
(RX-LOOP-VOLTAGE)
U1
C87
(GND)
(TX-LOOP-VOLTAGE)
J2
(RX AUDIO)
U3
U7
U11
U5
(TX-LOOP-VOLTAGE)
TP4
TP3 (RX-LOOP-VOLTAGE)
– 15 – – 16 –
SPP-A945
5-1. BLOCK DIAGRAM – BASE UNIT Section (1/2) –
ANT1
F2
B.P.F.
RF AMP
Q2
PLL
U2
F3
SAW
FILTER
RX VCO
Q9, 10
14
CP2
CP1
3
DATA
STB
XIN
RF AMP
CK
11
SECTION 5
DIAGRAMS
Q4
6
7
8
OSCILLATOR
PLL CLK
PLL DATA
PLL EN
Q14
MIX
Q7
IF AMP
Q6
F4
U20
SP1
SPK MUTE
MIC MUTE
IF AMP
Q5
IF AMP, LIMITER AMP, MIX
U1
IF AMP
5 8 10 14
IF
IN
VOICE SPEAKERPHONE
MIC AMP
1011
MCO
MCI
MUT
12
SPEAKER AMP
U14
IF
OUT
U12
ATTENUATOR
TXI TXO
F5
LIM
LIMITER
AMP
IN
CAR DET
21
HYBRID
AMP
789
HTI
ATTENUATOR
22 21
RXO
13
VLC
DMOD
OD CL
HT+
RXI
• SIGNAL PATH
: TX (TELEPHONE)
: RX (TELEPHONE)
EXPANDER, NIOSE GATE
U6 (1/2)
TELEPHONE
FILTER
BUFFER
U5 (2/3)
13
5
C151
QUAD-TUNE
VOLTAGE
SPEAKER
SWITCH
U13 (1/3)
AMP
2 1 23
FIL2
FIL2
OUT
IN
LOW-PASS
FILTER
U5 (1/3)
AF AMP
U18 (2/3)
PRE
IN
PRE/SUM
AMP
EXP MUTE
15
EXP
OUT
20
SWITCH
U13 (2/3)
AF AMP
U18 (1/3)
: BELL
BUFFER
Q17
B+
T1
: TX (INTERCOM)
: RX (INTERCOM)
: REC
: PB
J7
3
1
LINE
2
4
F1
B.P.F.
TX AMP
Q1
TX VCO
Q8, 11
FLASH
MEMORY
U7
A0-16
20-13,3,2,31,1,12,4,5,11,10
D0-7
21-23,25-29
30
CE
32
OE
B+ SWITCH
Q13
11
PLL REF
(PAGE 19)
(PAGE 19)
U6(1/2)
A0-16
36-22,13,12
D0-7
SP SWITCH
2,1,100-95
MCE
A
B
B+
DSP
SP01
LINE MUTE
DSP2SP
ADI SEL
VOL0
VOL1
VOL2
OFF HOOK
HOOK SW
LINE DROP
RING DET
RING ATTENUATOR
Q25
COMPRESSOR, NOISE GATE
U6 (2/2)
(PAGE 19)
TELEPHONE
RX DATA
RX MUTE
SWITCH
U13 (3/3)
TEL SWITCH
AF AMP
U18 (3/3)
OFF HOOK
LINE DROP
RING DET
21
35
28
OFF HOOK
LINE DROP
RING DET
543
COMP
OUT
IN2
AMP
FILTER
AMP
FIL1
FIL1
OUT
80
54
49
TI-
AMP
76
Q4
53
52
51
50
43
63
64
28
37
BUFFER
U5
RINGER DETECT
Q10
IN
OFF HOOK
LINE DROP
RING DET
1
10
14
11
4
9
BUFFER
U5 (3/3)
SELECTOR
Y1
B
X
A
Z
C
U4
Y
15
X0
12
Z0
5
Z1
3
IN2
6 16
SPK MUTE
MIC MUTE
MIC
AMP
COMP
MUTE
MIC
NF
10
TX MUTE
25
TX DATA
33
13
SPK MUTE
MIC MUTE
14
TX ENABLE
19
24 7 34 26 2318
RINGER
SP SWITCH
CAR DET
SYSTEM CONTROL
U3
C
OFF HOOK DETECT
TELEPHONE LINE
DETECT
U11, Q20-22
RINGER DETECT
U7
U8
– 17 –
– 18 –
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