Philips B7X14A User manual

English translation of Dutch service information for Philips B7X14A
Controls
1 Volume adjust
2 On/off switch
3 PU switch (pickup or record player)
4 Long wave switch
5 Medium wave switch
6 Short wave switch
7 FM switch
8 Tuning knob
9 Bass adjust
10Treble adjust
11 Tone switch
12 Tone switch
13 Reverb switch
14 Stereo switch
15 Mono switch
16 Balance
Specifications
Speakers 2 x AD3800 AM (800 ohm)
Mains voltages 110-127-145-165-220-245 V
Power rating 100 W at 220 V
Dimensions 27 x 71 x 29 cm
Wavelengths
LG (long wave) 1150-2000 m (260-150 kc/s)
MG (medium wave) 185-580 m (1622-517 kc/s)
KG (short wave) 16.5-50.8 m (18.2-5.9 kc/s)
FM 3-3.43 m (100-87.5 mc/s)
Circuit diagram
Refer to page 179 and 180.
Tube Layout
The fuse Z1 can also be located on the bottom left side of the transformer instead of the
top left side as shown here.
Malfunctions
A The radio does not work
1 Tubes and lamps do not glow a. Check if the mains voltage switch is set
correctly (see item 1 in figure 1)
b. Check if the fuse is ok (see item 2 in
figure 1)
c. Check if the tubes are seated properly and
if they are in the correct position (see
figure 1)
2 Tuning indicator does not glow a. Replace the rectifier tube B9 (see figure 1)
3 Tuning indicator reacts when tuning into
a station a. Attach a second speaker (800 ohm) to the extra speaker connector (if the radio works
then the speaker is defective)
B The radio works partially
1 Left or right speaker has no sound a. Replace B6 and/or B7 and/or B8
2 The radio works on FM but not on LW,
MW, SW a. Replace B2 and/or B4
3 The radio works on LW, MW, SW but not
on FM a. Replace B1 and/or B5
4 The record player input works but no
reception on LW, MW, SW, FM a. Replace in sequential order B2, B3, B4
5 The radio works normal but the tuning
indicator does not work a. Replace B10

C The radio works unreliably
1 The radio crackles and/or is intermittent a. Follow the directions mentioned in A-1
b. Check if the antenna-ground connectors
making good contact
c. Check if the symptom can be resolved by
replacing tubes in sequence
Block diagram
B2 Mixer B3 IF amplifier B4 detector B6-B7 Audio
LW MW SW LW MW SW Amplifier
B1 FM unit B2 IF amplifier B3 IF amplifier B4 IF amplifier B5 detector B6-B8 Audio
FM FM FM FM Amplifier
B9 Power B10 Tuning
Supply indicator
Special thanks are due to Jef Collin for this translation