SONY SPPA400
Service Manual

SECTION 3 TEST MODE
3-1. BASE UNIT
[Radio System Test] � This mode is activated when [GREETING] key is pressed in the Test Mode Idle status. 1. Operation in Radio System Test mode � In the Radio System Test mode, the RSSI is always monitored at IC601 #� pin (SIG-IN), and if RSSI is present (SIGIN =�Low�), the ANSWER LED turns on, or if RSSI is not present(SIG-IN = �High�), the LED turns off. � Current channel number is displayed on 7-SEG LED. Operation by key input � In the Radio System Test mode, the base unit always monitors the key inputs, and generates a key touch tone and goes in the following statuses according to each key pressed.

[Start-up method] 1. Set the [DIAL MODE] switch to the P (PULSE) side. 2. Reset the POWER ON (connect the AC adapter plug) while pressing [TIME], [REPEAT], [PLAY/STOP] keys. 3. Set the [DIAL MODE] switch to the T (TONE) side. 4. Using the signal in step 3 as a trigger, the base unit reads channel information with the key matrix, and starts the Test mode. 5. After the Test mode started, the base unit generates a completion tone, then based on the read channel information, it sets the channel and goes in Test Mode Idle status under the following conditions: � Relay ON (receiving status) � 7-SEG LED �c� display � RSSI gain HIGH * For the DB0~DB4 logic of key matrix and channel setting, refer to the frequency table. [Operation in Test Mode Idle status] In the Test Mode Idle status, the base unit always monitors the key inputs, and generates a key touch tone and goes in the following modes according to each key pressed. � [GREETING] key ................. Radio System Test � [TIME] key .......................... Audio System Test � [SET/REC] key .................... Key � LED � Terminating Test � [ANSWER ON/OFF] key ...... Switch � LED Test � [REPEAT] key ..................... Dial � Auto Hold Reset � Charge Test � [PLAY/STOP] key ................ C-ID Test � [ERASE] key ....................... Test Mode Quit The base unit quits Test mode and goes in Idle status. BASE UNIT FREQUENCY TABLE
Pin No. 5 4 3 2 1 TX FREQUENCY RX FREQUENCY Channel DB4 DB3 DB2 DB1 DB0 (MHz) (MHz) 1CH 2CH 3CH 4CH 5CH 6CH 7CH 8CH 9CH 10CH 11CH 12CH 13CH 14CH 15CH 16CH 17CH 18CH 19CH 20CH 21CH 22CH 23CH 24CH 25CH T1CH T2CH T3CH T4CH 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 43.720 43.740 43.820 43.840 43.920 43.960 44.120 44.160 44.180 44.200 44.320 44.360 44.400 44.460 44.480 46.610 46.630 46.670 46.710 46.730 46.770 46.830 46.870 46.930 46.970 43.780 43.890 46.800 46.900 48.760 48.840 48.860 48.920 49.020 49.080 49.100 49.160 49.200 49.240 49.280 49.360 49.400 49.460 49.500 49.670 49.845 49.860 49.770 49.875 49.830 49.890 49.930 49.990 49.970 48.800 48.970 49.910 49.950

2.

[PAGE] key � Radio channel is incremented by one. � TX ON/OFF and RX ON/OFF are same as the condition before the channel was incremented by one. � Channel number and 7-SEG LED display vary as follows:

1CH �2CH � . . . . � 19CH � 20CH �1� �2� �19� �0� � � T4CH � . . . . � T1CH � 25CH � . . . . � 21CH �9� �6� �5� �1� [ANSWER] key � Transmit mode is turned on. � Even in the condition other than transmit mode, key input becomes active to turn on the transmit mode. [GREETING] key � Receive mode is turned on. � Even in the condition other than receiver mode, key input becomes active to turn on the receive mode. [TIME] key � Transmit & receive mode is turned off. � Even in the condition other than transmit & receive mode, key input becomes active to turn off the transmit & receive mode. [SET/REC] key � RSSI gain is set to �Low�. (Once the gain is set to �Low�, low gain is kept during the Test mode.) [MEMO] key � Message transmission test � ID=AAAH and DATA=AAAH in length of frame sync + normal message frame length are transmitted continuously until [MEMO] key is pressed again. When [MEMO] key is pressed, a message transmission is stopped, and TX ON/OFF and RX ON/OFF are returned to the condition before the message transmission. [ERASE] key � Test Mode Idle status is resumed. � The Radio System Test mode quits, and the Test Mode Idle status is resumed.

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