Philips FR980 Service Manual page 13

2-2
5. Volume reset
TEST EQUIPMENT REQUIRED
1) AM/FM Signal Generator
2) Video Signal Generator
3) Digital Multimeter
4) Distortion level meter
ALIGNMENT PROCEDURES
1. Main amp idling current adjustment
3) After the above,adjust the idling current as follows:
Turn the power ON and adjust semi-fixed resistor R743 (Lch), R744 (Rch), R786 (Center ch) while observing
the digital multimeter indication.
The target value is 7.2 mV (20 mA).
2. Main amp DC offset adjustment
3. AM IF Adjustment
Input Signal Source Signal Source Signal Output Reception | Adjustment | Adjustment
Connection
Frequency
Level and Modulation
Frequency Point
Value
Output levet
Tuni ' (L or R)
uning point LAOQ6 Maximum
at TAPE-OUT
Signal Source Signal Output Reception | Adjustment| Adjustment
Frequency Level and Modulation Frequency Point Value
Output level
Level 300 - 400 pV/m (Lor R)
603 kHz Mod. 400 Hz 30% Gos nie lac Maximum
it TAPE-OUT
OD utput level
1404 kHz CA01
Signal generator output to
transmission "loop antenna.
(*:Standard required loop)
Level 300 pV/m (50dB/m)
Mod. 400 Hz 30%
999 kHz
4. AM Tracking Adjustment
**Input Signal Source
Connection
Signal generator output to
transmission *loop antenna.
(*:Standard required loop)
Level 300 - 400 pV/m (L or R)
1404 kHz Mod. 400 Hz 30% Maximum
t TAPE-OUT
Repeat step 1 and 2 until sensitivity be maximized.
PCS 98 390