Base Unit - Sony SPP-ID970 Service Manual

3-2. BASE UNIT

1. Test Mode
Entry— Simultaneously press the "HANDSET LOCATOR" key and toggle the "DIAL MODE" switch. When in test mode, the "LINE" and
"CHARGE" LEDs will be light on.
Alternative entry— Write 99h into LSB of location 9 in EEPROM.
Exit— Remove the AC power adaptor.
Toggle TX power— DIAL MODE switch (S2001)
T (TONE) position : TX ON
P (PULSE) position : TX OFF
Increment RF channel— Press the "HANDSET LOCATOR" key.
2. Test Equipment Required and Connection
frequency
counter
– RF UNIT (BU) –
J1
3. Verify Procedure
Item
18.4MHz Frequency Error
4. Adjustment Procedure
Item
18.4MHz Frequency Error
– BASE MAIN BOARD
(SIDE B) –
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
C2016 1. Remove C2017 from the BASE MAIN board.
2. Solder an 20PF chip capacitor C2016 (1-164-160-11) on the
BASE MAIN board (in parallel of C2015).
3. Connect the frequency counter to the test point J1. Adjust for 0 Hz ± 1 kHz.
– BASE MAIN BOARD
(SIDE A) –
– 16 –
U2001
C2017
C2015
C2016