Handset - Sony SPP-A972 Service Manual

HANDSET

1. Test Mode
[Entering the Test Mode]
[PGM]
1. Press the key, then displayed "DIRECTORY AREA
RINGER" on the LCD.
[*] [*] [8]
2. Press the , , ,
the LCD as below.
LCD display
**Test Mode**
TxPwr:_ Ch:05
NEW
OLD
LINE1 LINE2
[Releasing the Test Mode]
[OFF]
Press the key.
[Key Functions]
[7]
key : LCD test
LCD display
[0]
key : Toggle TX power.
LCD display
**Test Mode**
TxPwr : Ch:05
NEW
OLD
LINE1 LINE2
[ ]
# key : Increment RF channel.
LCD display
**Test Mode**
TxPwr:_ Ch:05
NEW
OLD
LINE1 LINE2
Increases the channel number
[3] [7] [8]
, , keys, then displayed on
E
E
E
2. Adjustment Equipment and Connection
frequency counter
+
–
– HAND MAIN BOARD
(Component Side) –
J1
C1057
C1031
C1029
U1001
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.
[0]
3. Press the key to turn on the TX power.
4. Check the frequency ± 1 kHz.
5. If the resuit is with in ± 1 kHz, then no alignment required.
Otherwise, refer to next item.
4. Adjustment the 18.4 MHz Frequency Error
Procedure:
1. Remove C1031 from the HAND MAIN board.
2. Solder on 20 PF variable capacitor C1057 (1-164-160-11) on
the HAND MAIN board. (in parallel of C1029).
3. Enter the test mode.
4. Connect the frequency counter to the test point J1 on the RF
unit.
[0]
5. Press the key to turn on the TX power.
6. Adjust C1057 on the HAND MAIN board for 0 Hz ± 1 kHz.
– 22 –
RF UNIT