SONY SPPA974
Manual de Servicio

2) HANDSET
1. Test Mode Entry� Press �PGM� key and enter � TEST� on keypad. 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

3) BASE UNIT
1. Test Mode Entry� Simultaneously press the �HANDSET LOCATOR� key and toggle the �DIAL MODE� switch. When in test mode, the �IN USE� 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 (S4001) T (TONE) position : TX ON P (PULSE) position : TX OFF Increment RF channel� Press the �HANDSET LOCATOR� key. 2. Test Equipment Required and Connection
C1029 C1030 � RF UNIT (HS) � J1 frequency counter � BASE MAIN BOARD (SIDE B) � � BASE MAIN BOARD (SIDE A) � frequency counter

� HAND MAIN BOARD � J1003

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BATTERY 3.6V 48pin U1001

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C1031 � RF UNIT (BU) �

J1 J1004

frequency counter

frequency counter

C4016 C4014 U4001 48pin

3. Verify Procedure Item 18.4MHz Frequency Error

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.

C4017

4. Adjustment Procedure Item 18.4MHz Frequency Error Adjustment Element C1030 Remark 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 U1001 pin rk. Adjust for 0 Hz ± 1 kHz.

3. Verify Procedure Item 18.4MHz Frequency Error

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.

4. Adjustment Procedure Item 18.4MHz Frequency Error

Adjustment Element C4016

Remark 1. Remove C4017 from the BASE MAIN board. 2. Solder an 20PF chip capacitor C4016 (1-164-160-11) on the BASE MAIN board (in parallel of C4014). 3. Connect the frequency counter to the U4001 pin rk. Adjust for 0 Hz ± 1 kHz.

�3�

�4�