Electrical Adjustments; Handset - Sony SPP-ID970 Service Manual

3-1. HANDSET

1. Test Mode
Entry— Press "PGM" key and enter "
Alternative entry— Write 99h into LSB of location 9 in EEPROM.
Exit— Press on "OFF" key.
LCD test— Press the "7" key.
Toggle TX power— Press the "0" key.
Increment RF channel— Press the "#" key.
2. Test Equipment Required and Connection
– HAND MAIN BOARD –
J1003
BATTERY
3.6V
J1004
3. Verify Procedure
Item
18.4MHz Frequency Error
4. Adjustment Procedure
Item
18.4MHz Frequency Error
SECTION 3

ELECTRICAL ADJUSTMENTS

TEST" on keypad.
C1029
U1001
Remark
Connect the frequency counter to the test point J1, press "0" key to turn on the TX power. Then, check
the frequency ± 1 kHz. If the result is within ± 1 kHz, then no adjustment required. Otherwise, refer to
item 4. for Adjustment Procedure.
Adjustment Element Remark
C1030 1. Remove C1031 from the HAND MAIN board.
2. Solder an 20PF chip capacitor C1030 (1-164-160-11) on the
HAND MAIN board (in parallel of C1029).
3. Connect the frequency counter to the test point J1. Adjust for 0 Hz ± 1 kHz.
C1031
C1030
frequency
counter
– 15 –
– RF UNIT (HS) –
J1