Service Manual Part 1
"8.
"8"8+ )#9@AA
Set the signal generator output level to -107dBm modulated to ±5kHz (±4kHz)
[±2.5kHz] deviation at 1kHz AF.
Connect an audio millivoltmeter across the speaker terminals.
Set the volume control for a reading of 0.8V (0dBm) on a convenient scale on the
millivoltmeter.
Switch off the signal generator modulation.
Note the reading on the millivoltmeter.
The fall in reading when the modulation is switched off should typically be 30dB
(28dB) [25dB].
"8"8- )#9%A
A good quality RF signal generator with low residual FM must be used for this
check (e.g. HP8640B or 8656).
Set the signal generator to give an on-channel signal, modulated to ±5kHz
(±4kHz) [±2.5kHz] with a 1kHz tone.
Set the signal generator output level to -47dBm.
Connect an AC millivoltmeter across the speaker terminals.
Adjust the volume control for a reading of 0.8V (0dBm) on a convenient scale.
Turn off the signal generator modulation.
Note the reading on the millivoltmeter.
The fall in reading when the modulation is switched off should be at least 50dB
(48dB) [45dB].
"8"8. $
Set the signal generator to give an unmodulated signal at an output level of
-120dBm.
Increase the input level in 10dB steps over the 50dB dynamic range and monitor
the RSSI output on pin 15 of S14 (logic PCB).
Ensure the output varies approximately 540mV/10dB over the dynamic range.