U3003
C3012
C3002
C3015
– BASE MAIN BOARD
(SIDE A) –
J1
frequency
counter
– BASE MAIN BOARD
(SIDE B) –
– RF UNIT (BU) –
– 19 –
– 20 –
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”
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 (S3001)
T (TONE) position : TX ON
P (PULSE) position : TX OFF
Increment RF channel— Press the “INTERCOM” key.
2. Test Equipment Required and Connection
3. Verify Procedure
Item
Remark
18.4MHz Frequency Error
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.
4. Adjustment Procedure
Item
Adjustment Element
Remark
18.4MHz Frequency Error
C3015
1. Remove C3012 from the BASE MAIN board.
2. Solder an 20PF chip capacitor C3015 (1-164-160-11) on the
BASE MAIN board (in parallel of C3002).
3. Connect the frequency counter to the test point J1. Adjust for 0 Hz ± 1 kHz.
Summary of Contents for SPP-ID975 - Cordless Telephone
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Page 27: ...SPP ID975 ID976 4 7 SCHEMATIC DIAGRAM BASE KEY SECTION 35 36 Page 27 ...
