Philips B7X14A Manual de usuario

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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