Sony SPP-A941 - Cordless Telephone With Answering... User manual

SERVICE MANUAL
Ver 1.0 2000. 09
CORDLESS TELEPHONE WITH ANSWERING SYSTEM
Mexican Model
SPECIFICATIONS
SPP-A941
General
Frequency band
902 - 928 MHz
Operating channel
30 channels
Dial signal
T ne, 10 PPS (pulse) selectable
Supplied access ries
AC p wer adapt r (AC-T130)
Teleph ne line c rds (2)
Wall bracket f r base unit
Rechargeable battery pack (BP-T23)
Handset
P wer s urce
Rechargeable battery pack BP-T23
Battery charging time
Appr x. 10 h urs
Battery life
Standby: Appr x. 6 days
Talk: Appr x. 7 h urs
Dimensi ns
Appr x. 56 x 183 x 43 mm (w/h/d),
antenna excluded
(appr x. 2 1⁄4 x 7 1⁄4 x 1 3⁄4 inches)
Antenna: Appr x. 32 mm
(appr x. 1 1⁄4 inches)
Mass
Appr x. 230 g
(a
pp
r x. 8 z), batter
y
included
Base unit
P wer s urce
DC 9V fr m AC p wer adapt r
AC-T130
Battery charging time
Appr x. 24 h urs
Dimensi ns
Appr x. 155 x 60 x 220 mm (w/h/d),
antenna excluded
(appr x. 6 1⁄8 x 2 3⁄8 x 8 3⁄4 inches)
Antenna: Appr x. 120 mm
(appr x. 4 3⁄ 4 inches)
Mass
Appr x. 520 g
(appr x. 1 lb 2 z), wall bracket excluded
Answering machine
Maximum rec rding time
Ab ut 15 minutes, using inc rp rated IC
Greeting message
Up t 90 sec nds per each
Inc ming and Mem message
Up t 4 minutes per message
Design and specificati ns are subject t
change with ut n tice.

– 2 –
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED
LINE WITH MARK 0ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
TABLE OF CONTENTS
1. GENERAL
Identifying the parts ........................................................ 3
Setting up the base unit ................................................... 4
Preparing the battery pack .............................................. 4
Making Calls ................................................................... 5
Receiving Calls ............................................................... 5
Telephone Features ......................................................... 6
Answering Machine Features ......................................... 7
2. DISASSEMBLY ......................................................... 11
3. TEST MODE.............................................................. 13
4. ELECTRICAL ADJUSTMENTS
Base Unit ......................................................................... 14
Handset ............................................................................ 16
5. DIAGRAMS
5-1. Block Diagram – BASE UNIT Section –...................... 17
5-2. Block Diagram – HANDSET Section –........................ 19
5-3. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 21
5-4. Printed Wiring Board – BASE MAIN Board – ............. 23
5-5. Schematic Diagram – BASE MAIN Board –................ 25
5-6. Printed Wiring Board – BASE KEY Board – ............... 28
5-7. Schematic Diagram – BASE KEY Board – .................. 29
5-8. Printed Wiring Board – HAND MAIN Board – ........... 30
5-9. Schematic Diagram – HAND MAIN Board – .............. 31
5-10. IC Pin Function Description ........................................... 33
6. EXPLODED VIEWS................................................ 35
7. ELECTRICAL PARTS LIST ............................... 37
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.

– 3 –
SECTION 1
GENERAL This section is extracted from
instruction manual.
Getting Started
13
US
Getting Started
Identifying the parts
Refer to the pages indicated in parentheses for details.
Handset
1
8
0
qa
qs
qf
7
6
5
3
4
2
qd
9
1Antenna
2Speaker
3TALK/BATT LOW lamp
Lights up during a call, flashes
when you store a phone number for
speed dialing.
4VOL (volume) switch (p. 16)
Adjusts the handset olume.
5TALK/FLASH button (p. 16, 18)
Lets you make or recei e a call.
6Dialing keys (p. 16)
7Battery compartment (p. 11)
8TONE button (p. 12, 16)
Allows you to switch temporarily to
tone dialing.
9PGM (Program) button
(p. 12, 21)
Used to store numbers for speed
dialing.
0CHANNEL button (p. 16)
Used to select a better channel.
qa OFF button (p. 16)
Allows you to disconnect the call.
qs REDIAL/PAUSE button
(p. 17, 20)
Redials the last number called /
inserts a pause in the dialing
sequence.
qd SPEED DIAL button (p. 12, 19)
Used to make a call with speed
dialing.
qf Microphone
continued
Getting Started
14
US
Identifying the parts (continued)
Base Unit
1Messagecounter ( p . 2 9 )
Indicates the number of new
messages recorded. “A” appears in
the announcement only mode. “F”
appears when there is no space to
record messages.
2REC/MEMO button (p. 25, 34)
Records a greeting or memo
message.
3ERASEbutton (p. 26, 31)
Erases the recorded greeting or
messages.
4SELECT button (p. 24)
5TIME/SET button (p. 24, 35)
Press when setting the day and
time, or to check the current time.
Also used when setting the remote
ID code (security code).
6REPEAT/SLOWbutton
(p. 30)
Press to repeat the current message
or go back to the pre ious message.
Keep the button pressed for slow
playback of messages.
7CHARGE lamp (p. 11)
Lights while the battery is being
charged.
8IN USE lamp (p. 18)
Lights when the cordless handset is
in use.
9MIC (microphone) (p. 25, 34)
0Antenna (p. 9, 37)
qa MENU button (p. 24)
qs Speaker
1
2
3
4
8
6
7
qa
qs
qd
qf
qj
5
9qh
qg
0
Getting Started
15US
Getting Started
w;qlqk
qd ANSWER ON/OFF button
(p. 29)
Turns the answering function on or
off.
qf VOLUME +/– buttons (p. 31)
Adjusts the speaker olume.
qg SKIP/QUICK button (p. 30)
Press to skip to the next message.
Keep the button pressed for quick
playback of messages.
qh PLAY/STOP (MAILBOX 1, 2, 3)
buttons (p. 30)
Plays back the messages in each
mailbox.
qj HANDSET LOCATOR button
(p. 23)
Allows you to page the cordless
handset.
qk Hook for AC power adaptor
cord (p. 9)
ql DC IN 9V jack (p. 9, 37)
w; LINE (telephone line) jack
(p. 9, 37)

– 4 –
Getting Started
8US
Step 2
Away from television
sets and other
electronic equipment
Away from a microwave
oven
Away from excessive
moisture, extremely low
temperatures, dust,
mechanical vibration, or
shock
Away from a personal
computer
Away from another
cordless telephone
Near a central location
and on a level surface
Away from heat sources, such as radiators,
airducts, and sunlight
Away from noise sources such as a window
by a street with heavy traffic
CAUTION: •Should you experience intermittent loss of audio during a conversation, try
moving closer to the base or move base unit away from other noise sources.
•The cordless telephone operates at a frequency that may cause interference to
nearby TVs and VCRs; the base unit should not be placed near or on the top of
a TV or VCR; and, if interference is experienced, moving the cordless telephone
farther away from the TV or VCR will often reduce or eliminate the
interference.
Setting up the base unit
Do the following steps:
• Choose the best location
• Connect the base unit
• Choose the dialing mode
Choose the best location
Where you place the base unit affects the reception quality of the
handset.
Getting Started
9
US
Getting Started
continued
1 Connect the telephone line cord
to the LINE jack and to a
telephone outlet.
2 Connect the AC power adaptor
to the DC IN 9V jack and to an
AC outlet.
3 Raise the antenna. Make sure it
points towards the ceiling.
Connect the base unit
If you want to hang the base unit on the wall, see page 37.
Hook the cord.
To LINE
3
To DC IN 9V
To an AC outlet
To the
telephone outlet
Telephone line cord
(supplied)
1
AC power adaptor
(supplied AC-T130)
2
Getting Started
10US
Notes
• Use only the supplied AC-T130 AC power adaptor.
Do not use any other AC power adaptor.
• Connect the AC power adaptor to a continuous power
supply.
• Place the base unit close to the AC outlet so that you
can unplug the AC power adaptor easily.
Tip
If your telephone outlet is not modular, contact your
telephone ser ice company for assistance.
Polarity of the plug
Step 2: Setting up the base unit (continued)
Modular
–
+
Getting Started
11
US
Getting Started
Preparing the battery pack
Charge the battery pack for more than 10 hours before you start using
your phone.
1 Slide open the battery
compartment lid of the handset.
2 Insert the battery pack (with
contacts facing down) into the
battery compartment.
3 Close the battery compartment
lid.
4 Place the handset on the base
unit.
The CHARGE lamp lights up
when the handset is properly
seated on the charge terminals
of the base unit. Charge the
battery pack for more than 10
hours so that the battery is fully
charged. The CHARGE lamp
remains lit e en after charging
is completed.
continued
Step 3
CHARGE lamp
BP-T23

– 5 –
Getting Started
12US
Battery duration
A fully charged battery pack lasts for about:
• Approx. 7 hours when you use the handset continuously
• Approx. 6 days when the handset is in standby mode.
Notes
• The battery pack will gradually discharge over a long period of time even if
not in use.
• If you leave the battery pack in the handset without charging it the battery
pack will be completely discharged.
It may require several times of charging to recover its full capacity.
To obtain the best performance from the battery
Do not place the handset on the base unit after each call. The battery
works best if the handset is returned to the base unit after two or three
calls. However do not leave the handset off the base unit for a long
period of time as this will completely discharge the battery pack.
When to purchase a new battery pack
If the battery lasts only a few minutes even after 10 hours of charging
the usable life of the battery has expired and needs replacement.
Contact your local Sony authorized dealer or service center and ask
for a Sony BP-T23 rechargeable battery pack.
Note
Battery life may vary depending on usage condition and ambient temperature.
Step 3: Preparing the battery pack (continued)
Choosing the dialing mode
For the telephone to work properly select an appropriate dialing mode
(tone or pulse). The default setting is tone.
1 Press (PGM).
The TALK/BATT LOW lamp flashes.
2 Press (*TONE).
3 Press (#) for pulse dialing or (*TONE) for tone dialing.
4 Press (SPEED DIAL).
You hear a confirmation beep and the TALK/BATT LOW lamp goes off.
Step 4
Basics
16US
To
Select a better channel
Adjust the handset
volume
Switch to tone dialing
temporarily
Switch to another call
(“call waiting” service*)
*Contact your telephone company to subscribe to this service.
1Pick up the handset from the
base unit.
2Press (TALK/FLASH).
TALK/BATT LOW lamp lights
up then you’ll hear a dial tone.
If you hear beeps move closer
to the base unit.
3Dial the phone number.
4When you’re done talking press
(OFF) or replace the handset on
the base unit.
The TALK/BATT LOW lamp
goes off.
Basics
Making calls
Additional tasks
(REDIAL/PAUSE)
(*TONE)
TALK/BATT
LOW lamp
Notes
• Before dialing make sure you can hear the dial tone otherwise you cannnot
dail correctly.
• When the TALK/BATT LOW lamp lights up by pressing (TALK/FLASH) the
IN USE lamp on the base unit lights up simultaneously.
VOL
switch
(CHANNEL)
Do this
Press (CHANNEL).
Set the VOL switch to H (high) M (middle) or L
(low).
Press (*TONE) while using the telephone after
you’re connected. The line remains in tone dialing
until disconnected.
Press (TALK/FLASH) to access the flash function.
Press (TALK/FLASH) again to return to the first
caller.
Basics
Basics 17US
If the handset battery becomes weak during a call
You hear a beep every three seconds and the TALK/BATT LOW lamp
on the handset flashes.
The call will disconnect soon. Replace the handset on the base unit to
charge.
For optimum performance, charge the battery for a full 10 hours.
Note that during the first 10 - 15 minutes of charging the phone will be
inactive i.e. unable to make or receive a call.
After this initial 10 - 15 minutes you may be able to use the phone but
the battery duration will be very short; thus it is recommended that
you fully charge the battery before the next usage.
Redialing
1Press (TALK/FLASH).
The TALK/BATT LOW lamp lights up.
2Press (REDIAL/PAUSE) to redial the number last dialed.
Note
If the number last dialed exceeds 16 digits only the first 16 digits are dialed.
Basics
18
US
1 When you hear the phone ring;
• Press (TALK/FLASH)
(or any key except (OFF)) .
or
• Pick up the handset from the base
unit when the handset is placed on
the base unit.
The TALK/BATT LOW lamp lights up
at the same time the IN USE lamp on
the base unit lights up.
2 When you’re done talking press
(OFF) or replace the handset on the
base unit.
The TALK/BATT LOW and IN USE
lamps go off.
Receiving calls
To
Select a better channel
Adjust the handset
volume
Switch to tone dialing
temporarily
Switch to another call
(“call waiting” service*)
*Contact your telephone company to subscribe to this service.
Additional tasks
Do this
Press (CHANNEL).
Set the VOL switch to H (high) M (middle) or L
(low).
Press (*TONE) while using the telephone after
you’re connected. The line remains in tone dialing
until disconnected.
Press (TALK/FLASH) to access the flash function.
Press (TALK/FLASH) again to return to the first
caller.
(*TONE)
TALK/BATT
LOW lamp
VOL
switch
(CHANNEL)

–6 –
Telephone Features
19
US
Telephone Features
Telephone Features
Speed dialing
You can dial with a touch of a few buttons by storing a phone number
on a dialing button. You can store up to 10 different phone numbers.
Storing phone numbers
1 Press (PGM).
The TALK/BATT LOW lamp flashes.
2 Press one of the dialing buttons ((0)
to (9)) for the phone number to be
stored.
3 Enter the phone number you want to
store.
You can enter up to 16 digits,
including a tone and a pause, each of
which is counted as one digit.
4 Press (SPEED DIAL).
You’ll hear a confirmation beep, and
the number is stored. The TALK/
BATT LOW lamp goes off.
Notes
• In step 3, if you don’t enter the phone number, the pre iously stored number
will be erased.
• Do not allow more than 30 seconds to elapse between each step of the
procedure.
• Before storing phone numbers, make sure the handset is not in use.
Tips
• If you enter a wrong number, start from the beginning.
• Use the supplied directory to write down what you stored on the speed
dialing numbers.
(REDIAL/PAUSE)
TALK/
BATT LOW
lamp
continued
20US Telephone Features
To store the previous number dialed
Press (REDIAL/PAUSE) directly after step 2, then go to step 4.
To store a number to be dialed via Private Branch Exchange (PBX)
Before entering a phone number in step 3 on page 19, do as follows:
1 Enter the outside line access digit (e.g. 9).
2 Press (REDIAL/PAUSE).
To change a stored number
To store a new number, follow the instructions described pre iously.
Making calls with speed dialing
1 Press (TALK/FLASH).
The TALK/BATT LOW lamp lights up.
2 Press (SPEED DIAL).
3 Enter the desired speed dialing number ((0) to (9)).
The phone number stored in the speed dialing number will be dialed.
Speed dialing (continued)
Telephone Features
21
US
Telephone Features
Setting the ringer type
You can select a ringer type from four types.
1 Press (PGM).
2 Press (#).
3 Press a number button, (1) to (4), to
select a ringer type.
4 Press (SPEED DIAL).
Turning off the ringer
1Press (PGM).
2Press (#).
3Press (5).
4Press (SPEED DIAL).
The ringer on the handset is turned off.
To turn the ringer on again
Follow the instructions described in “Setting the ringer type.”
Checking the ringer type
1Press (PGM).
2Press (#).
3Press (0).
The currently selected ringer sounds.
4Press (SPEED DIAL).
Note
If you hear no sound (only key beep), the ringer on the handset has been turned
off.
continued
22
US Telephone Features
Setting the ringer type (continued)
Setting the base ringer
1 Press (MENU) until you hear
“Set base ringer”.
“- -” blinks on the display.
2Press (SELECT) to turn the
ringer on or off.
3Press (TIME/SET).
The base ringer setting is
announced.
4Press (PLAY/STOP) to exit the
menu set up mode.
Note
The base ringer is preset to on.

–7 –
Telephone Features
23
US
Telephone Features
Paging
You can page the handset from the base unit.
Note that you cannot page if the handset is in use.
To Page
Press (HANDSET LOCATOR).
The handset rings for about one
minute.
To stop ringing, press (OFF) o n
the handset.
Tips
• You can page the handset e en when “RINGER” is set to “RINGER OFF”.
• To stop ringing at the base unit, press (HANDSET LOCATOR).
Note
If a call comes in paging, paging is cancelled.
24US Answering Machine Features
Answering Machine Features
Setting up the answering machine
Setting the time and day of the week
1 Press (MENU) repeatedly until
you hear “Set day and time”.
“- -” blinks on the display.
2 Press (SELECT) repeatedly to
select the day of the week.
3 Press (TIME/SET).
The day is set and the hour is
announced.
4 Press (SELECT) repeatedly to
select the hour.
5 Press (TIME/SET).
The hour is set and the minute is
announced.
6 Press (SELECT) repeatedly to
select the minute.
7 Press (TIME/SET).
The day and time you just
entered is announced and the
clock restarts.
8 Press (PLAY/STOP) to exit the
menu setup mode.
You will hear a long
confirmation beep.
Notes
• Press and hold (SELECT) to increase the minute setting by 10.
• The time and day are preset to Monday, 12:00 AM.
• “CL” flashes when the day and time is cleared or delayed due to a power
interruption, or when you connect the base unit to the AC outlet for the first
time.
Answering Machine Features
25
US
Answering Machine Features
Tip
All the mailbox buttons ( (MAILBO 1), (MAILBO 2) and (MAILBO 3)) work as
the (PLAY/STOP) button; press any of the three in this case.
To hear the current time
Press (TIME/SET). The current time setting is announced.
Recording the greeting
You can record your own greeting for the “normal” and
“announcement only” modes (see page 32).
1 Press (MENU) repeatedly until
“Set out-going message” is
announced.
“- -” blinks on the display.
2 Press (REC/MEMO).
“Now recording” is announced
and a long beep sounds.
3 Speak into the base unit
microphone (MIC). The display
starts counting. You can record
up to 90 seconds.
4 To stop recording, press
(PLAY/STOP).
Your greeting replays
automatically.
Notes
• If you do not record your own greeting, the prerecorded greeting will be
assigned automatically (see page 26).
• If your greeting is less than two seconds, the greeting is not recorded. The
prerecorded greeting will be assigned automatically.
• If a call comes in during recording, recording stops automatically.
• If 90 seconds ha e passed or memory becomes full in step 3, recording stops
automatically.
• “Memory full” is announced if no recording space is a ailable when you
press (REC/MEMO). Erase unnecessary messages (see page 31).
Tip
To record a greeting for the “announcement only” mode, select the
announcement only mode first (see page 32), then follow the instructions abo e.
Otherwise, the normal greeting will be recorded.
(ERASE)
continued
MIC
26
US Answering Machine Features
Setting up the answering machine (continued)
To check the greeting
Press (MENU) repeatedly until “Set out-going message” is announced.
Then press (PLAY/STOP) to play back the greeting.
To change the greeting
Record a new greeting by following the instructions on the pre ious
page. The new greeting replaces the old one.
To erase the greeting
1 Press (MENU) repeatedly until “Set out-going message” is
announced.
2 Press (ERASE).
Notes
• You can also erase the greeting during playback.
• If you ha e erased your own greeting, the prerecorded greeting will be
assigned automatically.
Prerecorded greetings
Normal mode: “Hello, I’m unable to answer your call
right now. Please lea e your name,
number and message after the tone.”
Announcement only mode: “Hello, I’m unable to answer your call
right now. Please call again. Thank you.”

–8 –
Answering Machine Features
27US
Answering Machine Features
Setting the number of rings
You can select the number of times the phone rings before it answers
to take a message.
There are four modes: 2, 4, 6, and Toll Sa er.
1 Press (MENU) repeatedly until you hear “Set number of
rings”.
“- -” blinks on the display.
2 Press (SELECT) repeatedly to select a ring duration (2, 4, 6,
or Toll Sa er).
To answer after 2 rings, select “2”.
To answer after 4 rings, select “4”.
To answer after 6 rings, select “6”.
Select “Toll Sa er” to answer after 2 rings when there are
new messages, and 4 rings where there are no new
messages.
3 Press (TIME/SET).
The ring duration setting is announced.
4 Press (PLAY/STOP) to exit the menu setup mode.
Notes
• When the number of rings is set to “Toll Sa er”, the phone answers after 2
rings if new messages are recorded. If no new message are recorded, it
answers after 4 rings. When you hear 3 rings, you will know that there are no
new messages. You can sa e the toll for the call when you pick up messages
from an outside phone.
• The number of rings is preset to 4 rings.
continued
28
US
Answering Machine Features
Setting the audible message alert
You ha e the option of ha ing a beep tell you if you ha e recei ed any
new incoming messages.
1 Press (MENU) repeatedly until
you hear “Set audible message
alert”.
“- -” blinks on the display.
2 Press (SELECT) to set the
audible message alert on or off.
3 Press (TIME/SET).
The setting is announced.
4 Press (PLAY/STOP) to exit the
menu setup mode.
Notes
• When the audible message alert is turned on, you will hear a beep e ery 10
seconds if there are any new messages.
• To stop the beep, press any button related to the answering machine function
or (VOLUME)(+)/(
- ).
• The audible message alert is preset to off.
Setting up the answering machine (continued)
(VOLUME)
Answering Machine Features
29US
Answering Machine Features
Turning on the answering function
Press (ANSWER ON/OFF) on the
base unit.
The ANSWER ON/OFF button
lights up.
Mailbox usage
This phone offers you three oice mailboxes, pro iding a con enient way to share the
mailbox feature with other members of your household or business.
When a caller calls
The caller can choose one of the two ways to lea e a message:
• If calling from a touch-tone phone, the caller select a mailbox by pressing (*)(1)
(MAILBOX 1), (*)(2) (MAILBOX 2) or (*)(3) (MAILBOX 3) while the caller hears
the greeting. The greeting stops and a beep will sound, then the caller can start
recording a message
• Wait until the greeting finishes, then start recording a message. When the caller
does not select a mailbox, the message is automatically recorded to MAILBOX 1.
Notes
• If four minutes ha e passed while recording the incoming message, the line will be
disconnected automatically.
• If the message is shorter than two seconds, it will not be recorded.
To turn off the answering function
Press (ANSWER ON/OFF) on the base unit.
The ANSWER ON/OFF button goes off.
Note
The answering function is preset to on.
Tip
The answering machine will automatically answer a call after 10 rings, e en if the answering
function is off and announces “Please enter your security code” to prompt the caller to turn on
the answering function.
When the memory is full
The total recording time of this answering machine is approximately 15 minutes
(including the greeting, messages, and memo).
When the remaining recording time becomes less than 30 seconds, “F” flashes on the
display and the answering machine goes into the memory full status.
In this status, the answering machine will not answer a call until after 10 rings e en if
the answering function is on.
To a oid this erase unnecessary messages (see page 31). You can also erase the
messages from an outside phone (see page 36).
(ANSWER ON/OFF)
Message counter
30
US
Answering Machine Features
Do this
Press a mailbox button ((MAILBO 1),
(MAILBO 2) or (MAILBO 3)).
Press (REPEAT/SLOW) during play back.
Press (SKIP/QUICK).
Press (REPEAT/SLOW) within the first two
seconds of the current message playback.
Press and hold (REPEAT/SLOW) during play
back.
Release (REPEAT/SLOW) to return to normal.
Press and hold (SKIP/QUICK) during play
back.
Release (SKIP/QUICK) to return to normal.
To
Stop playback
Repeat the current message
Skip the current message
Go back to the pre ious message
Play back slowly
Play back quickly
Playing back messages
If there are new messages, the display flashes the number of new
messages.
You will hear beeps if the audible message alert setting is on (see page 28).
Press a mailbox button
((MAILBO 1), (MAILBO 2) or
(MAILBO 3)) to play back new
messages in the selected mailbox.
Additional tasks when playing back messages
Notes
• If a call comes in, the play back will stop.
• A time and day stamp is announced after each message.
Tips
• If there are no new messages, all the pre iously re iewed messages are
played back.
• The messages are sa ed e en after a power failure.
(PLAY/STOP) (SKIP/QUICK)
(ERASE)
(REPEAT/SLOW)

–9 –
Answering Machine Features
31
US
Answering Machine Features
Adjusting the speaker volume
To adjust the speaker olume, press
(VOLUME)(+) or (
- ).
Notes
• When you ha e reached the minimum or maximum olume le el, you will
hear three short beeps.
• You cannot adjust the speaker olume while the phone is ringing.
Tip
There are 8 steps for the olume le el (1 to 8). The olume le el is preset to 5.
Erasing messages
1 Press and hold (ERASE) for
more than two seconds.
2 Press a button for the mailbox
you want to erase ( (MAILBO 1),
(MAILBO 2) or (MAILBO 3)).
You will hear a long
confirmation beep and all “old”
messages in the selected
mailbox are erased.
To erase individual messages
Press (ERASE) while playing back the message that you want to erase.
Note
The display shows the total number of “new” (i.e. unre iewed) messages.
Therefore, the display is reset to “0” when you ha e played back all new
messages, whether they ha e been erased or not. Be sure to erase unnecessary
messages before the memory becomes full.
32
US
Answering Machine Features
Selecting the Announcement Only
Mode
You can set the answering machine to play the greeting without
recording incoming messages (announcement only mode). You might
want to select this mode when, for example, you expect to be away for
a while and you cannot pick up messages.
1 Press (MENU) repeatedly until
you hear “Set announce only”.
2 Press (SELECT) to set the
announcement only mode on or
off.
3 Press (TIME/SET).
The setting is announced.
4 Press (PLAY/STOP) to exit the
menu setup mode. The display
shows “A” when the answering
machine is set to the
announcement only mode.
Notes
• To acti ate announcement only mode, you ha e to turn on the answering
machine.
• The announcement only mode is preset to off.
Answering Machine Features
33US
Answering Machine Features
Screening calls
You can screen calls by lea ing the answering machine on while you
are at home. When a call is answered, you can hear the message being
recorded through the base unit. You can decide either to continue
recording or to answer the call.
The message will be recorded, but to hear it you will need to play back
the message (see page 30).
To answer the call
Press (TALK) on the handset.
Notes
• Press (VOLUME)(+) or (
- ) to adjust the speaker olume. If the speaker
olume is set at its minimum le el, you will not be able to hear incoming calls.
• The answering machine will stop automatically when the handset or a parallel
phone is picked up. If the answering machine does not stop, press either
(PLAY/STOP) on the base unit, or (*)(0) on the handset or parallel phone.
The recording will remain as a new message.
34
US
Answering Machine Features
Recording a memo message
You can lea e messages for other users of the unit.
1Press (REC/MEMO).
2Press a mailbox button
((MAILBO 1), (MAILBO 2) or
(MAILBO 3)) to which you
want to lea e the message.
“Now recording” is announced
and counting starts.
3Speak into the base unit
microphone (MIC) to record
your message.
A memo can be up to four
minutes in length.
4Press (PLAY/STOP) to stop
recording.
The message number on the
display increases by one.
Notes
• If the memory becomes full, the answering machine will stop recording.
• “Memory full” is announced if no recording space is a ailable when you
press (REC/MEMO).
• If your message is shorter than two seconds, the recording will be canceled.
• The display flashes “99” if you record a memo for more than 99 seconds.
• If a call comes in during recording, the recording will be stopped.
MIC

–10 –
36US Answering Machine Features
Key
(#)(1)
(#)(2)
(#)(3)
(#)(4)
(*)(5)
(#)(5)
(#)(6)
(*)(7)
(#)(7)
(*)(8)
(#)(9)
(#)(0)
Notes
Plays back from the first new message.
Plays back from the first new message.
Plays back from the first new message.
Press during play back to repeat a message. To
skip backward, press within two seconds after
the current message starts.
Press to access simple oice menu. Press again
to access ad anced oice menu.
Stops e ery function
Press during play back to skip forward.
“Now recording” is announced.
Re iew your greeting
Select the mailbox by entering “1”, “2” or “3”.
Press during play back
Turns the system on/off. “Answer machine on”
or “Answer machine off” is announced.
Table of control codes
To
Play back messages in MAILBOX 1
Play back messages in MAILBOX 2
Play back messages in MAILBOX 3
Repeat/skip backward
Get help
Stop operation
Skip forward
Record greeting
Check greeting
Record a memo
Erase indi idual messages
Turn answering machine on/off
Picking up new messages
1 Call your telephone number from a touch-tone phone.
2 When you hear the greeting, press (#) and enter your remote ID code
(security code).
You will hear a confirmation beep.
The number of new messages will be announced.
3 Press the keys in the “Table of control codes” below for the desired
operation command.
4 When you are finished, disconnect the line.
Notes
• Do not let two seconds elapse between each digit of the remote ID code (security code) and
the control code.
• If you did not turn on the answering machine, your phone answers automatically after 10
rings.
• If the message recording memory runs out, the answering machine turns off automatically.
“Memory full. Please enter your security code” is announced.
• If you enter wrong remote ID code (security code) three times, the line will disconnect.
• If no keys are pressed within 20 seconds, the line will disconnect.
Tips
• Press (*)(0) on the touch-tone keypad or (PLAY/STOP) on the base unit to disconnect the
line.
• Cut off the Remote Control Card and carry it with you to see how to operate from an outside
phone.
Operating from an outside phone (continued)
Answering Machine Features
35
US
Answering Machine Features
Operating from an outside phone
Setting the remote ID code (security code)
To operate the answering machine from a touch-tone phone while you
are away from home, you need to set the remote ID code (security
code).
1 Press (MENU) repeatedly until
you hear “Set security code”.
2Press (SELECT) to change the
remote ID code (security code)
setting.
3Press (TIME/SET) to confirm
your choice.
The new remote ID code
(security code) is announced.
4Press (PLAY/STOP) to exit the
menu setup mode.
Note
Press and hold (SELECT) to increase the remote ID code (security code) by 10.
(VOLUME)
continued

– 11 –
HAND CABINET (REAR)
HAND MAIN BOARD
Note: Follow the disassembly procedure in the numerical order given.
SECTION 2
DISASSEMBLY
5Remove the hand cabinet (rear)
to direction of the arrow B.
1Remove the battery case li
d
to direction of the arrow A.
4claw
3two claws
3two claws
2two screws
(BTP3 ×12)
A
B
2two screws
(BTP3 ×10)
1four screws
(P2 ×5)
3washer
6vol knob
5Remove the hand main board
to direction of the arrow C.
4antenna (ANT2)
C

– 12 –
CABINET BASE (BOTTOM)
BASE MAIN BOARD, BASE KEY BOARD
2claw
2claw
3cabinet base
(bottom)
1five screws
(BTP3 ×12)
1three screws
(P3 ×8)
3screw (P3 ×10)
7seven screws
(P3 ×10)
8base key board
5base main board
2three charge springs
4harness
6tone-pulse
knob

– 13 –
SECTION 3
TEST MODE
BASE UNIT
1. Entering theTest Mode
1. While pressing the [HANDSET LOCATOR] key, turn the
power ON, then change over the [DIAL MODE] switch from
“PULSE” to “TONE” within 4 seconds.
2. When enter the test mode, Light up the [CHARGE] and
[IN USE] LEDs.
2. Change the Mode
Press and hold the [HANDSET LOCATOR] key for about 2 sec-
onds to change the mode like Mode 1, Mode 2, Mode 3, Mode 4,
Mode 1....
Mode 1:
[CHARGE] LED : Lights up.
Function : Change the channel.
Operation : Each time the [HANDSET LOCATOR] key
is pressed momentarily, change the channel
like 0, 1, 2...9, 0... (default channel is 5ch)
Mode 2:
[CHARGE] LED : Goes off.
Function : Toggle TX power.
Operation : Each time the [HANDSET LOCATOR] key
is pressed momentarily, change over ON/
OFF. (default status is ON)
Mode 3:
[CHARGE] LED : Lights up.
Function : Not used in servicing.
Mode 4:
[CHARGE] LED : Goes off.
Function : Transmit the tone signal for 3 seconds.
Operation : Press the [HANDSET LOCATOR] key mo-
mentarily to transmit the tone signal, and
blinks the [CHARGE] LED.
Each time transmit it, then change the fre-
quency of signal tone like 697 Hz, 770 Hz,
852 Hz, 941 Hz, 1209 Hz, 1336 Hz, 1477
Hz, 1633 Hz, 697 Hz... (default frequency is
697 Hz)
3. Releasing theTest Mode
Disconnect the power.
HANDSET
1. Entering the Test Mode
1. Press two keys of [3] and [#] simultaneously.
2. When enter the test mode, the happy tone is emitted.
2. Key Functions
[CHANNEL] key
• Change the channel. (Each time the [CHANNEL] key is
pressed, change the channel like 0, 1, 2...9, 0... (default chan-
nel is 5))
• Refresh PLL, RX/TX counters.
[PGM] key
• Toggle TX power. (ON: lights up the [TALK/BATT LOW]
LED)
• Refresh PLL, TX counters.
[SPEED DIAL] key
• Toggle RX power.
• Refresh PLL REF, RX/TX counters.
[REDIAL] key
• Toggle TX attenuator.
• Refresh PLL status register.
[TALK] key
• Change PLL gain mode. (lowest →highest (4 steps))
[OFF] key
• Exit the test mode and emit the sad tone.
Note: All keys pressed will emit the key tone.

– 14 –
SECTION 4
ELECTRICAL ADJUSTMENTS
5. MOD Deviation Adjustment
1. Connect the RF generator to TP (ANT) on the MAIN RF unit.
2. Connect the audio generator (to feedback bridge) to LINE jack
(J7) on the BASE MAIN board.
3. Set the audio generator as follows.
output level : –17 dBv
output frequency: 1 kHz
4. Set the RF generator as follows.
input frequency : 903.8 MHz
filter frequency : 300 Hz to 3 kHz
detector : PK+1/2
5. AdjustVR2 on the BASE MAIN board for 25 ± 3 kHz reading
on the RF generator.
Setting:
1. Enter the test mode. (refer to page 13)
2. Set the channel to 6ch.
1. RX Loop Voltage Confirmation
1. Connect the digital voltmeter to TP15 (RX LOOPVOLTAGE)
on the BASE MAIN board.
2. Confirm that the value of digital voltmeter is 0.5 Vdc to 4.3
Vdc.
2. TX Loop Voltage Confirmation
1. Connect the digital voltmeter toTP14 (TX LOOPVOLTAGE)
on the BASE MAIN board.
2. Confirm that the value of digital voltmeter is 0.5 Vdc to 4.3
Vdc.
3. TX Frequency Adjustment
1. Connect the RF generator to TP (ANT) on the BASE RF unit.
2. Adjust C15 on the BASE MAIN board for 903.8 MHz ± 3
kHz reading on the RF generator.
4. DEMOD Audio Level Adjustment
1. Connect the RF generator to TP (ANT) on the BASE RF unit.
2. Connect the audio generator (to feedback bridge) to LINE jack
(J7) on the BASE MAIN board.
3. Set the RF generator as follows.
output frequency : 926.55 MHz
output level : –50 dBm
FM deviation : 25 kHz
MOD tone frequency: 1 kHz
4. Adjust VR1 on the BASE MAIN board for –10 ± 1 dBv read-
ing on the audio generator.
0 dBm = 0.775 V
0 dBv = 1 V
BASE UNIT
Adjustment Equipment and Connection
BASE RF Unit
TP (ANT)
RF
generator
BASE MAIN
Board
LINE Jack (J7)
audio
generator
feedback
bridge
DC 9 V
digital
voltmeter
TP14 (TX LOOP VOLTAGE)
TP15 (RX LOOP VOLTAGE)

–15 –
Adjustment Location:
TP (ANT)
– BASE RF UNIT (Side A) –
SW1 TP15 (RX LOOP VOLTAGE)
TP14 (TX LOOP VOLTAGE)
TONE
PULSE
VR1
DEMOD Audio
Level Adjustment VR2
MOD Deviation
Adjustment
C15
TX Frequency Adjustment
–BASE MAIN BOARD (Component Side) ––BASE MAIN BOARD (Conductor Side) –

–16 –
Setting:
1. Enter the test mode. (refer to page 13)
2. Set the channel to 6ch.
3. Set the [VOL] switch (S19) to the “L” position.
4. Disconnect the microphone (U9) wire at the HAND MAIN
board.
1. TX Frequency Adjustment
1. Connect the RF generator to TP (ANT) on the HAND RF unit.
2. Adjust C92 on the HAND MAIN board for 926.55 MHz ± 3
kHz reading on the RF generator.
2. DEMOD Audio Level Adjustment
1. Connect the RF generator to TP (ANT) on the HAND RF unit.
2. Connect the audio generator to TP (RECEIVER +) on the
HAND MAIN board.
3. Set the RF generator as follows.
output frequency : 903.8 MHz
output level : –50 dBm
FM deviation : 25 kHz
MOD tone frequency: 1 kHz
4. Adjust R113 on the HAND MAIN board for –90 ± 5 mV read-
ing on the audio generator.
3. MOD Deviation Adjustment
1. Connect the RF generator to TP (ANT) on the HAND RF unit.
2. Connect the audio generator to TP (MIC IN) on the HAND
MAIN board.
3. Set the audio generator as follows.
output level : 35 mV
output frequency: 1 kHz
4. Adjust R119 on the HAND MAIN board for 25 ± 3 kHz read-
ing on the RF generator.
HANDSET
Adjustment Equipment and Connection
HAND RF Unit
TP (ANT)
RF
generator
HAND MAIN
Board
TP (RECEIVER +)or
TP (MIC IN)
audio
generator
DC 3.6 V
digital
voltmeter
Adjustment Location:
C92
TX Frequency
Adjustment
TP (RECEIVER +)
TP
(MIC IN)
R113
DEMOD Audio Level
Adjustment
R119
MOD Deviation
Adjustment
TP (ANT)
–HAND RF UNIT –
(Side B)
–HAND MAIN BOARD –
(Side A)

SPP-A941
8
10 2 1 23 20 19 18
1
2 3 4 5
9
6
ANT1
(ANTENNA)
4 7 5
V REG B+
(RX PWR B+)
TX PWR B+
OSC
Q4
BUFFER
U5 (3/4)
26
LOW-PASS
FILTER
U5 (4/4)
TX MUTE
Q6
TX
FREQUENCY
C15 X1
4MHz
FIL2
IN
FIL2
OUT
PRE
NF
EXP
OUT
COMP
OUT
FIL1
OUT
FIL1
IN
LOW-PASS
FILTER
LOW-PASS
FILTER
COMPRESSOR, EXPANDER,
NOISE GATE
U4 DEMOD
AUDIO LEVEL
EXPANDER
CIRCUIT
DE-
EMPHASIS
MOD
DEVIATION
PRE
EMPHASIS
LINE DC
COMPARATOR
U2
RINGER
DETECT
U8
DATA/AUDIO
ADDER
U5 (2/4)
PREAMP
VR2
+
6 15 16
COMPRESSOR
CIRCUIT
+
+
VR1
9
10
RO1 AMP
MIC AMP
IN2 EXP MUTE COMP MUTE MIC OUT
RIN RO1
MIC
NF
BUFFER
Q17
T1
LINE
TRANSFORMER
23 MAIL BOX
1
ANSWER
ON/OFF
D9 – 12
LINE
J7
12
11
13
10
9
3 4 2 1
3 – 8
24
DTMF
LOW-PASS FILTER
U5 (1/4)
4
5
15
10
13
12
1
8
3
6
2
7
14
11
16
9
U1
7 SEGMENTS
LED
MESSAGE
COUNTER
7 SEGMENTS
LED DRIVE
Q9
7 SEGMENTS
LED DRIVE
Q8
15
1
214
4
3
5
6
LED/7 SEGMENTS
LED DRIVER
U10
12
11
10
17
20
2322
21
19
15
1
B+ SWITCH
(FOR LEDS)
G10
LD4 LD3 LD2 LD1
•SIGNAL PATH
: RX
: TX
: BELL
Ref No.
KP0
KP1
KP2
KP10
KP11
KP12
KP20
PANEL DESIGNATION
REC/MEMO
ERASE
ANSWER ON/OFF
MAIL BOX 1
2
3
SLOW REPEAT
PANEL DESIGNATION
QUICK SKIP
VOLUME –
VOLUME +
MENU
SELECT
TIME SET
Ref No.
KP22
KP30
KP31
KP40
KP41
KP42
9
10
15
14
13
2
11
3
5
16
20
KEY MATRIX
KP0 – 2, 10 – 12, 20, 22,
KP30, 31, 40 – 42
7SEG D1
7SEG D2
L DATA
L CLK
L LATCH
+3V
LED SEL
COL0
J4
I-TAD
UNIT
COL2
ROW0
ROW4
10
J1
17
16
11
18
4
1
5
3
8
14
LIFPOUT
MIC +
MIC –
LIFMIN1
SPK OUT
SP EN
HOOK SW
BU HOOK
LINE DC
I-TAD RING DET
+5V V REG B+
MI1
MIC
SPEAKER AMP
U6
HOOK ON/OFF
DETECT
Q1
SP1
(SPEAKER)
DIAL MODE
SW1
PULSE
TONE
HANDSET
LOCATOR
KP16
IN USE
+
LED DRIVE
Q12
LED1
CHARGE
LED2
CRADLE/CHARGE
DETECT
Q15, 16
B+ SWITCH
(FOR TX SYSTEM)
Q5
RESET SIGNAL
GENERATOR
Q2, 3
+5V
REGULATOR
U9
TX PWR B+
V REG B+
(RX PWR B+)
+
–
ATE
J8
DC IN 9V
–+
CHARGE
TERMINAL
+5V
RX AUDIO
TX PWR
TX AUDIO
CAR DET
PLL REF
PLL EN PLL CLK PLL DATA
RF1
RF UNIT
DIN
DOUT
CLK
CS
EEP DI
EEP/PLL DATA
EEP/PLL CLK
PLL EN
EEP CS
OSC2 OSC1
CAR-DET
RX DATA
MUTE
DTMF1 – DTMF6
TX DATA
CA1
CA2
A1
A2
B1
B2
C1
C2
D1
D2
E1
E2
F1
F2
G1
G2
QA
QB
QC
QD
QE
QF
QG
A
LATCH CLK
SHIFT CLK
RESET
TONE/
PULSE
PAGE
SYSTEM CONTROLLER
U1 (2/2)
OFF HOOK
RINGER DET
ATE
CRADLE DET
TX ENABLE
RESET
05
27 18 25 16
EEPROM
U3
SYSTEM CONTROLLER
U1 (1/2)
HOOK ON/OFF
RELAY DRIVE
Q7
D3
U7
– 17 – – 18 –
SECTION 5
DIAGRAMS
5-1. BLOCK DIAGRAM – BASE UNIT Section –

SPP-A941
ANT2
(ANTENNA)
7
8
5
3
4
6
1
9
RX PWR B+
TX PWR B+
2 1 23 20 19 17
10
3 4 5
BUFFER
U5 (4/4)
LOW-PASS
FILTER
U5 (2/4)
COMPRESSOR, EXPANDER,
NOISE GATE
U7
LOW-PASS
FILTER
LOW-PASS
FILTER
BUFFER
Q1
FIL2
IN
FIL1
OUT
FIL2
OUT
PRE
IN
EXP
OUT
FIL1
IN
DE-
EMPHASIS
PRE
EMPHASIS
MOD
DEVIATION
EXPANDER
CIRCUIT
COMPRESSOR
CIRCUIT
DATA/AUDIO
ADDER
U5 (3/4)
PREAMP
+
R119
DEMOD
AUDIO LEVEL
R113
COMP
OUT
15
+
6 16
MIC
NF
ROIN RO2
RO1 AMP RO2 AMP
MIC AMP
U9
(MIC)
U8
(SPEAKER)
18
VOL
S19
RO1
L (LOW)
M (MEDIUM)
H (HIGH)
EXP MUTE IN2 COMP MUTE
CRADLE
DETECT
Q15
ATE
B+ SWITCH
(FOR ANALOG SYSTEM)
Q18
REGULATOR
ERROR
AMP
MUTE SHUT DOWN
COMPARATOR
AUXILLARY
COMPARATOR
DROP OUT
DETECT AMP
MCU PWR B+
Q20
V-ANA PWR B+
B+ SWITCH
(FOR TX SYSTEM)
Q13
TX PWR B+
B+ SWITCH
(FOR RX SYSTEM)
Q16
RX PWR B+
SWITCHING
Q19
WATCH DOG TIMER
COMPARATOR
U5 (1/4)
ATE
CHARGE
TERMINAL
CRADLE DET
IRQ
TX ENABLE
21
23
2
RESET 1
LOW BATT 22
15
RX ENABLE 16
+
–
OUTPUT
FEED
BACK
ERROR
COMP OUT
INPUT
1.23V
SHUT
DOWN
COMP IN
D7
RECHARGEABLE
BATTERY PACK
(BP-T23)
REGULATOR,
RESET SIGNAL GENERATOR, BATTERY DETECT
U11
15
5
11
3
14
6
10
25
11
13
12
26
24
19
20
17
U4
(BUZZER)
BUZZER DRIVE
Q14, 17
TALK/BATT LOW
D5
OSC
Q12
TX
FREQUENCY
C92
X1
4MHz
27
3 –6 7 –10
COL0–COL3 ROW1–ROW4
KEY MATRIX
(SHEET KEY)
S1 –18
Ref No.
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16
S17
S18
PANEL DESIGNATION
FLASH TALK
CHANNEL
OFF
1
2 ABC
3 DEF
4 GHI
5 JKL
6 MNO
7 PQRS
8 TUV
9 WXYZ
TONE
0 OPER
#
PGM
SPEED DIAL
REDIAL
•SIGNAL PATH
: RX
: TX
: BELL
05
RX AUDIO
TX AUDIO
PLL DATA
PLL CLK
PLL EN
PLL REF
RX PWR
TX PWR
RF2
RF UNIT
TX DATA
MUTE
BEEP
TALK/BATT LED
SYSTEM
CONTROLLER
U3
RX DATA
PLL DATA
PLL CLK
PLL EN
OSC2
OSC1
– 19 – – 20 –
5-2. BLOCK DIAGRAM – HANDSET Section –

Caution:
Pattern face side: Partsonthe patternface sideseen from
(Side B) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Side A) the parts face are indicated.
5-3. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Schematic Diagram:
• 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 Ωand 1/4W or less unless otherwise
specified.
• % : indicates tolerance.
•C: panel designation.
•U: B+ Line.
•H: adjustment for repair.
• Powervoltages aredc 9V and fedwith regulateddc power
supplyfromexternal powervoltage jack(J8)on the BASE
MAIN board, dc 12 V and fed with regulated dc power
supply from modular jack (J7) on the BASE MAIN board
with 100 Ωin series, and dc 3.6 V and fed with regulated
dcpower supply frombatteryterminal onthe HAND MAIN
board.
• Voltages and waveforms are dc with respect to ground in
test mode.
∗: Impossible to measure
• Voltages are taken withaVOM(Inputimpedance10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
N: RX
O: TX
P: BELL
Note on Printed Wiring Board:
•X: parts extracted from the component side.
•Y: parts extracted from the conductor side.
•b: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
•: connected by carbon pattern.
– 21 – – 22 –
• IC Block Diagrams
U6 KA8602D (BASE MAIN Board)
+–
2
3
4
BIAS
CIRCUIT
+–
1
8
7
6
5
AMP1 AMP2
IN+
IN–
OUT1
VCC GND
OUT2
MUTE
RIPPLE
REJECTION
U4 TA31103F (BASE MAIN Board)
U7 TA31103F (HAND MAIN Board)
U10 MC74HC595AF (BASE MAIN Board) U11 LP2953IM (HAND MAIN Board)
2
1
E-RECT
PRE OUT
PRE NF
VCC
VREF
THROUG
RO2
RIN
EXP OUT
RO1
COMP MUTE
EXP MUTE
4
FIL1 OUT
3
FIL2 IN
FIL2 OUT
+
–
+
–
59
8
7
6
IN2
C-RECT
C-NF
FIL1 IN
COMP OUT
10 11 12
24 20
21
22
23 19 17
18 15 14 13
16
GND
MIC IN
MIC OUT
MIC NF
∆G
VREF
+
–
VREF
VREF
SWITCH
CONTROL
+
–
+
–
MIC AMP
SUM
AMP
+
–
+
–
∆G
VREF
VREF
PRE AMP
SUM
AMP
RO1
AMP
COMP
MUTE
EXP
MUTE
THROUG
THROUGH
IN 2
AMP
FILTER
AMP 1
FILTER
AMP 2
+
–
VREF
RO2
AMP
+
–
12 3 45 6 7 8
9
10
16 15 14 13 12 11
SHIFT REGISTER
LATCH
PARALLEL DATA
OUTPUT
GND
VCC
LATCH CLOCK PARALLEL DATA OUTPUT SERIAL DATA INPUT OUTPUT ENABLE SHIFT CLOCK SERIAL DATA OUTPUT RESET
QB
QC
QD
QE
QF
QG QH
SQH
A
QA
2
3
1
8
9
10
11
12
13
14
15
7
5
6
4
SHUT DOWN
ERROR
NC
GND
NC
OUTPUT
SENSE
GND
VREF
COMP IN
COMP OUT
GND
INPUT
FEEDBACK
5V TAP
+
–
+
–
+
–
+
–
ERROR
AMP
SHUT DOWN
COMPARATOR
DROP OUT
DETECTION AMP
AUXILLARY
COMPARATOR
1.23V
16 GND

SPP-A941
– 23 – – 24 –
D1 B-6
D3 F-9
D4 B-12
D5 I-12
D8 B-4
D9 B-4
D10 B-4
D11 E-4
D12 C-3
D16 C-3
D25 B-7
Q1 I-10
Q2 I-6
Q3 I-6
Q4 I-10
Q5 H-9
Q6 I-4
Q7 C-6
Q8 I-14
Q9 H-14
Q10 I-14
Q12 C-11
Q15 C-12
Q16 E-12
Q17 D-6
U1 H-8
U2 C-6
U3 J-7
U4 H-3
U5 H-6
U6 I-13
U8 E-5
U9 F-4
U10 G-12
Z1 D-2
Z2 C-2
• Semiconductor
Location
Ref. No. Location
5-4. PRINTED WIRING BOARD – BASE MAIN Board – • See page 21 for Note on PrintedWiring Board.
L21
L1
U9
3
1
2
1
3
4
L27
J7
L2
L3
L28
L4
L23
R78
27
J3
1
1
22
18
1
13
1
R108
SW1
SW1
DIAL MODE
TONE PULSE
VR2
VR1
D9
D10
D12
D11
D8
F1
L26
LINE
TRANSFORMER
L25
X1
R2
R3
R63
R15
U8
+
ATE
–
EC5
+
EC4
+
EC11
+
EC10
J1
J4
+
EC1
+
EC6
+
EC3
+
EC2
+
EC133
+
EC150
+
EC137
+
EC134
+
EC132
+
C15
C131
05
A
BASE KEY
BOARD
J2
35-4672-04
C97
C46
C95
TP15(RX LOOP VOLTAGE)
TP14 (TX LOOP VOLTAGE)
C99
R5
R4
C4
R6
5
8
4
1
R8
U2
U7
R9
R138
R139
R121
R110
R143
R132
C150
R122
R141
R149
R142
R109
C2
R7
R69
R20
R32
R104
R51 R79
D4
K A K
Q15
B C E
Q12
B C E
Q16
E C B
Q4
E C B
Q5
B C E
Q1
B C E
Q2
Q3
B C E
B C E
R71
R70
R81
R16 R80
R17
C48 9
16
8
1
C45
R82
14
1
15
U1
28
R21
R19
C51
R38
C10
R105
R27
C9
C8
R39
R67
C6
R72
R95
C57
R85
C38
C39
R91
C41
R60 C28
C26
R89
C40
R90
R86
R93
C7
C30
C55
R68
R24
C29
C31
8
14
U5
7
1
R23
R47
R58 C22
R77
R61
R62
R26 C27
C35
R76
C32
R75
C34 C17
R53
C18
C19 R54
R57
1
12
24
U4
13
R52
R56
C20
C21
C25
R55
R59
C136
C135
C52
C23
C16
C33
R74
C12 C53
R48
C13
R49
R50
C14
R92
C50
R22
R30
R46
R73
R84
R64
C5
C36
C37 R66 R65
R44
R43
R42
R41
R40
R37
R36
R34
R35
R45
C11
5
8
U3
4
1
R29
R25
R33
R31
R96
R14
R13
R12
R11
R10
U10
R1
R97
U6
R28
R99
R102
C3
C44 R101
R100
C43
C42
5
8
4
1
R107
R106
R98
R103
Q9
E C B
Q10
E C B
Q8
E C B
Q7
D16
KA
Q6
E C B
Q17
5
3
1
2
4
6
DC IN 9V
J8
–+
BASE MAIN BOARD
MI1
MIC
EC9
+
EC8
+
LINE
K
15
A
B
C
D
E
F
G
H
I
J
12 3 4 5 6 7 8 9 10 11 12 13 14
00
J2
I-TAD
UNIT
RF1
RF
UNIT
ANT1
C1
Q4
BCE
BCE
R111
C59
D1
D25
AA
Z2
Z1
C54
D5
AK
C56
D3
AK
K
R83
CHARGE
TERMINAL
(Page 28)