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21

Press "FLASH" button (TX Power on)

"REDIAL" button (SS on)

TP Tx ANA pull up wire open.
Set Marconi: Tx Test   : Select "Tx Test" Mode

TX Power

Broad/Narrow   : Select "Broad" Band Mode

Check TX Power reading more than +20 dBm - (Jig Loss from CN4 to CN3). When this value is NG, replace RF unit.

1. Connect audio cable positive lead to TP-AF ( 13 pin of CN600), negative lead to TP-GND ( 23 pin of CN600) and BNC
    end to AF INPUT on Marconi.
2. Set Marconi:

(a)  Rx Test : Select Rx Test

(b)  RF Gen   ON/OFF  : RF Output on

(c)  FREQ.

: Input Rx Freq.= 904.560MHz (CH1)

(d)  LEVEL : Input RF Level = (-30dBm)+(Fig Loss from CN1 to CN2)

(e)  Mod Gen   ON/OFF  : FM on

(f)   Freq.

: Input Audio Freq = 1.0kHz

(g)  LEVEL : Input FM dev Level = 24kHz

(h)  AF Filter   0.3 to 3.4k  : Select AF Filter

3. Press SINAD button until the display shows the SINAD value and press dB button.
4. Press "Amplitude" of Marconi. Lower the value of Amplitude so that SINAD is 12 dB.
5. When pin 13 of CN600 (AF Out) is touched, confirm that Amplitude value of Marconi is less than {(-105 dBm)+Jig Loss from
    CN1 to CN2)}. When this value is NG, replace RF unit.

1. Keep same RX TEST settings as in Receiving Sensitivity Check.
2. Connect scope (X1) positive lead to TP-SQL 15 pin of CN600 on RF UNIT, negative lead to TP-GND 23 pin of CN600 and
    BNC end to scope. Set scope to following condition.
     (a) TIME/DIV = 1 msec.
     (b) VOLT/DIV = 1 V
3. Set RF GEN LEVEL to [-95dBm +(Jig Loss CN1 

→

 CN2) (+8 dBµ Vemf)]. Check scope voltage is LOW.

4. Set RF GEN LEVEL to [-120dBm +(Jig Loss CN1 

→

 CN2) (-7 dBµ Vemf)]. Check the scope voltage is HIGH.

5. When the scope does not show above condition, press " RF Gen  and  LEVEL " of Marconi and lower the value of
   Amplitude so that SINAD is 12 dB.
   When TP - SQL is touched, adjust VR801 until scope voltage toggles between LOW & HIGH. When VR801 cannot be adjusted
   at this value, replace RF unit.

1. Set Marconi as same conditions of Receiving Sensitivity Check.
2. Connect positive lead of DC voltmeter to TP-RSSI and negative lead to TP-GND.
3. Confirm that RSSI value is +2.3 V±0.03 V.
4. When RSSI value is not +2.3 V±0.03 V, adjust the value at VR800. When RSSI cannot be adjusted at this value, replace
   RF unit.

RF UNIT

900MHz

Tx ANA

pull up

RX ANT

GND

CN2

CN1

CN3

ANT
Marconi
Mode: Rx Test

PN

CN4

1750MHz

Jig: PQZZTG200RF1

down converter

2.4GHz

GND

TX

RSSI

IC990

C991

CN102

TXANA

ANT

Marconi

Mode:
Tx Test

~

22

Please prepare the BASE UNIT before performing any adjustment procedures. Refer to the BASE UNIT REFERENCE DRAW-
ING for connection and test point locations.

1.

Unscrew all 4 screws from bottom of cabinet. Remove cabinet bottom.

2.

Unsolder antenna wire at RF module, and remove an antenna.

3.

Solder a test mode switch as shown on the BASE UNIT REFERENCE DRAWING.

4.

Solder one isolation capacitor's positive lead to the main P.C.Board TPT point and the other isolation capacitor's positive

         lead to the main P.C.Board TPR point.

5.

Connect the Audio Cable, positive lead to the TIP isolation capacitor's free lead, the negative lead to the RING isolation
capacitor's free lead. Do not connect the BNC end of the cable.

6.

Connect the Telephone Analyzer PHONE TEST JACK #1 to the BASE UNIT P.C.Board phone jack.

7.

Connect the corded telephone to the Telephone Analyzer PHONE TEST JACK #2.

  8.    Remove main P.C.Board from cabinet top and place beside cabinet.
  9.

Solder High Frequency Cable open end to ANT and RF GND as specified in BASE UNIT REFERENCE DRAWING
(P21, P25).

If you have one of the listed symptoms, please refer to this table and make the appropriate adjustments.

Transmission sound to HANDSET receiver is unstable

Does not link with HANDSET

Adjust Items (A) and (C).

Adjust Items (C) and (D).

Please perform the following steps to prepare the BASE UNIT for the Adjustment procedure.

1.

Set up all equipment as specified in following Item's Equipment Section.

2.

In pressing "Test" switch, connect AC Adaptor to DC Jack of BASE UNIT main P.C.Board.

3.

Press LOCATOR / INTERCOM button once. Next press "#" button, and "LOCATOR / INTERCOM" button
every once.
BASE UNIT P.C.Board should be in TEST MODE (CH1 TALK). Connect  Marconi, and confirm frequency for CH1. If unit is
not in TEST MODE, remove power from P.C.Board and repeat from step2.

4.

The output power switches ON/OFF at every time you press "FLASH" key. (Factory default setting is OFF).

5.

SS mode switches ON/OFF at every time you press "REDIAL" key. (Factory default setting is ON).

  6.    Pull up wire close TP-TXANA.

Set Marconi
 Tx Test
 Tx Freq.  : Input 656.160MHz
Output power of base unit: "ON"
(Follow the procedure (4).)
SS mode of base unit: "OFF"
(Follow the procedure (5).)
TP Tx-ANA pull up.
High Frequency Cable to right RF con-
nector.

Take phone off hook

Check MARKER equals 656.160 MHz ± 0.003 MHz
(offset 

≤ 

±3kHz).

When value is overed 656.160 MHz ± 0.003 MHz
(offset 

≤ 

±3kHz), Adjust VC790 of RF unit.

(A)

Standard Frequency

ADJUSTMENT ITEM

DESCRIPTION

EQUIPMENT

PROCEDURE

REMEDY

SYMPTOM

(Tx Test)

ADJUSTMENT PROCEDURE

23

ADJUSTMENT ITEM

DESCRIPTION

(B)

Voice signal Output

EQUIPMENT

      indicates the button of Marconi
 Rx Test  : Select Rx Test Mode
 RF Gen , ON/OFF  : RF Output on
 FREQ.  : 904.560MHz
 LEVEL  : -30dBm + (Jig Loss CN1 

→

 CN2)
 Mod Gen   ON/OFF  : FM on
 FREQ.  : 1.0kHz
 LEVEL  : 24kHz
 AF Filter , 0.3 to 3.4kHz  : Select AF
 Filter
SS Mode of base unit: ON
(Follow the procedure (5).)
High Frequency Cable to left RF
connector.
Audio Cable positive lead to TPT
isolation capacitor, negative lead to
TPR isolation capacitor. (If not using
B&K1050)

Take phone off hook

      indicates the button of Marconi
 Tx Test  : Mode Select
 Tx Freq.  : Input 656.160MHz =
                  2406.160MHz - 1750MHz
 Audio Gen
 Gen1/Gen2  : Select Gen1 (AF1)
 ON/OFF  : AF Gen1 "ON"
 FREQ.  : Input "1.0kHz"
 LEVEL  : Input "-29.0dBm"
 Mod Meter  IF Filter  300kHz  Return
 AF Filter  0.3 to 3.4kHz
(Input between TPT-TPR)
High Frequency Cable to right RF
connector.SS mode of base unit:
"OFF" (Follow the procedure (6).)
Output power of base unit: "ON"
(Follow the procedure (4).)
TP Tx-ANA pull up.

Take phone off hook

PROCEDURE

Adjust VR402 on Main PCB until AF VOLTS equals
-6dBm ± 2dBm.

(Rx Test)

(C)

RX Input

(Line Modulation)

(Tx Test)

Adjust VR401 on Main PCB until MOD LEVEL
equals 24 kHz ± 0.5 kHz

Notes
You need to place the  HANDSET in TEST mode to drow
spurious RF signals that is being received at the BASE
UNIT. By shorting the MIC leads insures that you are
sending an unmodulated RF signal.
You need the corded phone off hook to keep
the telephone analyzer from sending a dial tone to
the unit under test. The dial tone adds to
the MOD LEVEL value greatly.

24

(D)

Squelch

(RX sensitivity confirmation

and squelch adjustment)

      indicates the button of Marconi
 Rx Test  : Select Rx Test Mode
 RF Gen , ON/OFF  : RF Output on
 FREQ.  : 904.560MHz
 LEVEL  : -30dBm + (Jig Loss CN1 

→

 CN2)
 Mod Gen   ON/OFF  : FM on
 FREQ.  : 1.0kHz
 LEVEL  : 24kHz
 AF Filter , 0.3 to 3.4kHz  : Select AF
 Filter
SS Mode of base unit: ON
(Follow the procedure (5).)
One end of BNC cable to left RF
connector, other end to Attenuator
Input. Audio Cable positive lead to TPT
isolation capacitor, negative lead to
TPR isolation capacitor, BNC end to AF
INPUT connector.

SETUP X1 probe connected to INPUT
1. Probe ground connected to GND.
TIME/DIV 1ms
VOLT/DIV 1V
Auto trigger

Take off hook

On Marconi, press "Rx Test" and "SINAD" until the
display shows the SINAD value and press dB. Then
press "Rx Test", "RF Gen" and "Level" on Marconi.
Lower Amplitude at SINAD 12 dB and confirm that RF
GEN LEVEL is less than
[-105dBm + jig-loss CN1 

→ 

CN2].

Attach the oscilloscope probe to TP SQL. When
Amplitude is set at .-95dBm+(Jig Loss CN1 

→

 CN2),

confirm that the signal of TP-SQL is Low. After
that, set Amplitude -120dBm+(Jig Loss CN1 

→

 CN2),

and confirm that the signal of TP-SQL is High.
When level is NG, adjust again following Squelch Check.
(Refer to page 12.)

(Rx Test)

      indicates the button of Marconi
 Rx Test  : Select Rx Test Mode
 RF Gen , ON/OFF  : RF Output on
 FREQ.  : 904.560MHz
 LEVEL  : -30dBm + (Jig Loss CN1 

→

 CN2)
 Mod Gen   ON/OFF  : FM on
 FREQ.  : 1.0kHz
 LEVEL  : 24kHz
 AF Filter , 0.3 to 3.4kHz  : Select AF
 Filter
SS Mode of base unit: ON
(Follow the procedure (5).)

(E)

RSSI Level Adjustment

Adjust VR800 so that the Voltage of TP RSSI becomes
2.3V ± 0.03V. (Refer to page 12.)

(Rx Test)

Once aligned, please reassemble the base unit. Also take off the back of the HANDSET and unsolder the MIC lead short wire if
you previously installed it.

ADJUSTMENT ITEM

DESCRIPTION

EQUIPMENT

PROCEDURE