Sony SPP-A985 - Cordless Telephone With Answering System, Руководство по обслуживанию

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SECTION 3
ELECTRICAL ADJUSTMENTS
BASE UNIT
1. Test Mode
[Entering the Test Mode]
While pressing the
[INTERCOM ]
key, turn the power ON, then
change over the
[DIAL MODE ]
switch. When enter the test mode,
light up the
[LINE ]
and
[CHARGE ]
LEDs.
[Releasing the Test Mode]
Press the
[FLASH ]
key or turn the power OFF.
[Key Functions]
[REDIAL/PAUSE ]
key : Toggle TX power.
[VOL +]
key: Increment channel.
[VOL -]
key : Decrement channel.
[0]
key : Clear all speed dial locations.
[SPEAKERPHONES]
key : Toggle apeaker phone ON or OFF.
2. Adjustment Equipment and Connection
U3003
C3012
C3002
– BASE MAIN BOARD –
(SIDE A)
J1
frequency
counter
– BASE MAIN BOARD –
(SIDE B)
– RF UNIT (BASE) –
3. Check the 18.4 MHz Frequency Error
Procedure:
1. Enter the Test Mode.
2. Connect the frequency counter to the test point J1 on the RF
unit.
3. Press the
[REDIAL/PAUSE ]
key to turn on the TX power.
4. Check the frequency
±
1 kHz.
5. If the result is within
±
1 kHz then no alignment required.
Otherwise, refer to next item.
4. Adjustment the 18.4 MHz Frequency Error
Procedure:
1. Remove C3012 from the BASE MAIN board.
2. Solder on 20 PF variable trimmer capacitor C3002 (1-141-546-
12) on the BASE MAIN board.
3. Enter the test mode.
4. Connect the frequency counter to the test point J1 on the RF
unit.
5. Press the
[REDIAL/PAUSE ]
key to turn on the TX power.
6. Adjust C3002 on the BASE MAIN board for 0 Hz
±
1kHz.