AUDIO TELEX IC30, Информация о сервисе

Страница: 12 / 14

5. Function Checks (Final stage).
5.1 Move signal generator to Mic2. Turn up volume control. Watch for irregularities.
Check for 10.5V out.
5.2 Move signal generator to Mic3. Turn up volume control. Watch for irregularities.
Check for 10.5V out.
6.
Line level inputs (Final stage).
6.1
Connect signal generator to Line1 input. Check input sensitivity – LINE (85mV +
20mV) in 10.5V out.
6.2 Move signal generator to Line2 input. Check 10.5V out.
6.3 Move signal generator to Line3 input. Check 10.5V out.
6.4 Check muting function by shorting mute terminals on rear barrier strip.
6.5 Check operation of (230 – 240)V selector switch for full wattage in each position
of switch.
6.6 Frequency Response – Check the frequency response and power bandwidth of 1
st
set of every new batch of production.
Frequency Response – (250Hz – 10kHz).
Power band – (250Hz – 6.5kHz).
7.
Finishing up (Final stage).
7.1
Short output and check that signal cuts out and returns after short is removed.
7.2 Remove input signal and check for Hum and Noise (<20m Vrms)
7.3 Connect 12V DC to rear barrier strip, turn off power switch. Check signal remains.
7.4 Reset volumes to minimum.
7.5 Disconnect from test bench and inspect for scratches on external paint.
8.
Burn In.
8.1
Leave units on (with lid) for 24 hrs.
9.
Sound Test (Check Fuse Ratings).
9.1
Adjust tone controls to minimum. and maximum listening for scratches and
irregularities. Similarly for each level control with MASTER full.
9.2 Connect CD player to Line4 and bring up channel and master volumes.
9.3 Listen for irregularities.
9.4 Check priority of (MIC1 and MIC2) over all other channels.
9.5 Check all the tones.