Base Phone - Sony SPP-ID975 Service Manual

3-2. BASE PHONE

1. Test Mode
Entry- Simultaneously press the "INTERCOM" key and toggle the "DIAL MODE' switch. When in test mode, the "LINE" and "CHARGE"
Alternative entry- Write 99h into LSB of location 9 in EEPROM.
Exit- Remove the AC power adaptor.
Toggle TX power- DIAL MODE switch (S3001)
T (TONE) position : TX ON
P (PULSE) position : TX OFF
Increment RF channel- Press the "INTERCOM" key.
2. Test Equipment Required and Connection
frequency
counter
3. Verify Procedure
Item
4. Adjustment Procedure
I Item
(SIDE B) -
Remark
Connect the frequency counter to the test point J 1, press "0" key to turn on the TX power. Then, check
the frequency f 1 kHz. If the result is within + 1 kHz, then no adjustment required. Otherwise, refer to
item 4. for Adjustment Procedure.
2. Solder an 20PF chip capacitor C3015 (l-164-160-11) on the
BASE MAIN board (in parallel of C3002).
3. Connect the frequency counter to the test point Jl. Adjust for 0 Hz + 1 kHz.
(SIDE A) -