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STIIII4GO VERTJtOIJWILUIC
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Ala.... - Philips CENTRALE SERVICE AFDELING
Sontco Handola·on N.V. Philips' ~ht.n voorbehouden itnAoven
PHILIPS
SERVICE DOCUMENTATION
For the receiver
BX 640 A
1954 For power from alternating current networks
93 981 77.1.22
-2~ BX 640 A
Band Range Pointer Signal Adjust Setting
MW 1 452 kHz into g1B2 S33,S32,S28 max. output
via. 33000 pF S29, S32 max. output
MF Lock Circuit (cores of S11, S12 coils)
---
I MW 2 452 kHz S11,S12,S11 .m1n.:.. output
HF Circuits (Set pointer at Trimpoint 1)
2 6,38 MHz S23,S5):repeat max. output
SW ** 1 11 '73 MHz C32,C9) max. output
···-
MW * 2 610 kHz S25~ repeat max. output
1 1500 kHz 033 max. output
2 610 kHz ** s 6) repeat max. output
MW 1 1500 kHz 010 ) max. output
-
2 169,5 kH ** C70) repeat max. output
LW * 2 169' 5 kHz 8 7) max. output
LW Filters (S42 screw in)
1134 kHz S42 !!!1£.:_ output
LW Tune device to 230kHz
* Connect points 1 and 2 of strip A
** Undo the connection set in the above step
One must take care that the connection is set or unset at the times indicated in the triming
table.
BX 640 A -3-
ADJUSTMENT OF Receiver FM PORTION
Adjustment made with the aid of an FM oscillator for calibration of all the FM circuits applies:
FM range selected.
Volume control to maximum, tone control on quality.
Diode voltmeter connected on C56 (voltmeter not earthed).
A voltmeter connected via transformer trim on the wire for the extra speaker.
The voltage across C56 must be limited to 8V
MF Circuits
Tuning Connect signal Mute with Trim
Signal generator to Adjust
Designation
Capacitor Set to 4700 Q
max. 10,7 MHz g1B2 via S30 S31 max. D.V.
Dev 22,5 kHz 1500 pF S31 S30 max. D.V.
Mod 500 Hz - 834 max. D. V.
- S36 max. output
max. 10,7 MHz g1B1 via S27 S26 max. output
Dev 22,5 kHz 1500 pF S26 S27 max. output
Mod 500 Hz S21 S20 max. output
- S21 max. output
HF Circuits
011 Almost completely
89,5 MHz 100 MHz FM 1r - S13 max. output
Dev 15 kHz - 011 max. outJut
Mod 500 Hz 1st peak
87,5 MHz 87,5 MHz FM 1r - S13 max. output
Dev 15 kHz S14-15
Mod 500 Hz
100 MHz 100 MHz FMir - 011 max. output
Dev 15 kHz 012
Mod 500 Hz
BX 640 A
Adjustment with the aid of an AM service oscillator, for calibration of all the FM circuits applies:
Volume control at maximum, tone control on quality.
Diode voltmeter connect to C56, voltmeter to settle.
The voltage limit over 056 at about 8 V.
All signals are unmodulated.
MF Circuits
Tuning capacitor Connect signal Mute Trim
Apply signal of with Designation
set to generator to
4700 g adjust
max. 10,7 MHz g1B3 via S30 S31 max. D.V.
1500 pF S31 S30 max. D.V.
- S34 max. D.V.
max.
3f
10,7 MHz g1B3 via - S36 min. D.V.
1500 pF
:!f3f
max. 10,7 MHz g1B2 via S27 S26 max. D.V.
1500 pF S26 S27 max. D.V.
10,7 MHz g1B1 via S21 S20 max. D.V.
1500 pF - S21 max. D.V.
HF Circuit
C11 Almost completely
88,5 MHz 100 MHz FMI ..4 ~
- S13 max. D.V.
100 MHz 100 MHz FMI ..4 - C11 ma:x:. D.V. 1st peak
-
~
87,5 MHz 87,5 MHz FMI ...... S13-S14-15 max. D.V.
100 MHz 100 MHz FMi ...L ~
- C11,C12 max. D.V.
3f Connect two series-connected resistors (220k 1%) across C56. Connect a diode
probe voltmeter between the junction of these resistors and the R22-C52 node
~ Remove the resistors and reconnect the diode probe voltmeter via C56
BX 640 A -5-
List of Parts
Description Part Number
Scale (N) A3 743 11.2
Case A3 739 92.0
Leaf spring for rear mounting A3 648 56.2
Tulle for chassis mounting A3 642 15.0
Button (large) MC A3 751 61.0
Reed (large button) A3 650 18.0
Button (small) MC A3 751 59.0
Reed (small button) A3 522 08.2
Push-button A3 417 61.0
Noval tube holder B1 506 59.0
Spring Clip (double can) A3 652 58.3
Spring Clip (single can) A3 652 75.1
A variable capacitor 49 001 92.0
Socket plate(pu) A3 382 13.0
Voltage selector A3 228 84.0
Tension spring A3 646 14.0
Tule scale for confirmation P5 420 03/08
Torsion Spring ballast unit .
A3 651 16.0
Small spring for switch segment A3 644 85.0
Power switch A9 867 12.0
Spring for SKF2 A3 646 44.0
Rim lock tube holder B1 506 53.0
Dipole R 210 KN/03 AA
Antenna switch A3 182 47.0
DJ[Rsw
BX 640 A
S1 ) S41 A3 152 99.0
S2 ) S42 A3 125 84.0
S3 ) A3 142 52.0
S44 ) A3 153 09.0
Z1 ) S45 )
S4 )
S5 ) A3 125 97.0 01 50~iF)
S6,6a A3 118 35.0 C1a 50!lF) A9 999 11/50+50
S7, 7o A3 118 36,0 02 50!lF) +50
38 ) 07 1 O~iF A9 999 04/10E
S9 ) A3 118 07.0 C8 1500pF A9 999 04/1K5
S10 ) C9 18pF 49 005 59.4
C10 18pF 49 005 59·4
S11 ) C11 30pF 28 212 36.4
S12 ) A3 126 85.0
012 30pF 28 212 36.4
S13 ) C13 380pF A9 999 04/ 3.30Et-
S16 ) A3 127 02,0 A9 999 04/47E
S17 ) 014 270pF A9 999 04/270E
015 12pF A9 999 04/12E
S14 ) 016 47pF A9 999 04/47E
S15 ) A3 127 03.0
017 270pF A9 999 05/270E
S20 ) C18 1OOpF A9 999 04/100E
S21 ) A3 126 99.0 019 18pF A9 999 04/18E
C31 15pF ) C20 33pF A9 999 04/33E
021 12pF A9 999 04/12E
S22 ) C22 220pF A9 999 04/220E
S23 ) A3 125 98.0
023 10000pF A9 999 04/1 OK
S24 ) 024 470pF A9 999 04/470E
S25 ) A3 125 99.0 C25 10000pF A9 999 04/10K
026 4700pF A9 999 04/4K7
S26 ) C27 200pF A9 999 04/200E
S27 ) C28 4700pF A9 999 04/4K7
034 33pF ) A3 127 00.0
029 47pF A9 999 04/47E
C35 33pF ) 030 4700pF A9 999 04/4K7
S28 ) 032 30pF 28 212 36.4
S29 ) C33 18pF 49 005 59.4
C36 110pF ) A3 126 84.0 C38 4700pF A9 999 04/4K7
C37 195pF ) C39 330pF A9 999 04/330E
S30 ) 040 4700pF A9 999 04/4K7
S31 ) 041 6800pF A9 999 04/6K8
C42 33pF ) A3 127 00.0 C46 100pF A9 999 04/100E
C43 33pF ) C47 47pF A9 999 04/47E
C48 4700pF A9 999 04/4K7 I
S32 ) C49 1OOOOpF A9 999 04/1 OK i
S33 ) C50 6800pF A9 999 04/6K8
C44 11 OpF ) A3 126 84.0
051 2200pF A9 999 04/2K2
C45 195pF ) 052 1OOOpF ~9 999 06/1K
S34 ) C54 4700pF A9 999 04/4K7
~36 ) 055 4700pF IA9 999 04/4K7
A3 127 01.0 C56 1O~iF !AC 5705/10 '
~36a
P53 47pF ~ 057
C58
10000pF
8200pF
IA9 999 04/10K
IA9 999 06/8K2
C72 22pF )
061 4,7pF IA9 999 06/4E7
S37 ) C62 2200pF IA9 999 04/2K2
S38 ) A3 152 99.0 059 2700pF IA9 999 06/2K7
S39 ) c6o 1000pF IA9 999 06/1K
~40 ) 063 22000pF A9 999 06/22K
BX 640 A
C64 3300pF
~ IA9 400K+1M6
A9 999 06/3K3 R24 1 ,6MQ
C66 10000pF A9 999 04/10K R25 0,4MQ 999 16/GL
C67 3000pF A9 999 05/3K
C68 100pF A9 999 04/100E R26 68000 Q IA9 999 00/68K
C69 70pF A9 999 07/20- B27 68 Q IA9 999 oo/68E
100E R28 10MQ IA9 999 00/10M
C70 100pF A9 999 07/20- R29 o, 22MQ IA9 999 00/220K
100E R30 0,47MQ IA9 999 00/470K
C73 680pF A9 999 04/680E R31 4, 7MQ IA9 999 00/4M7
C74 47000pF A9 999 06/47K R32 0,47MQ ~[ 999 00/470K
C75 3,9pF A9 999 04/3E9 R33 0,22MQ 9 999 00/220K
c8o 2,2pF A9 999 04/2E2 R34 0,22MQ A9 999 00/220K
C81 3900pF A9 999 06/3K9 R35 0,56MQ A9 999 00/560K
C82 0,471lF A9 999 06/470K R36 o, 1MQ ~? 999 oo/1ooK
C83 22000pF A9 999 06/22K R37 1200 Q 9 999 00/1K2
C84 1500pF A9 999 06/1K5 R38 10 Q IA9 999 00/10E
085 1500pF A9 999 06/1K5 R39 0,18MQ IA9 999 00/180K
R1 900 Q 2xB1 636 10 R40 47000 Q IA9 999 00/47K
R1b 94 Q 2xA9 999 00/47 E R41 O, 1MQ IA9 999 00/100K
R1a 100 Q B8 300 32B/100E R42 1M&< )
R1c 18 Q 48 494 10/18E R42a 1MQ ) B1 639 19.0
R2 470 rJ A9 999 00/470E R43 10 Q A9 999 00/1 OE
R3 33000 Q A9 999 00/33K R44 2,7MQ ~9 999 00/2M7
R4 0,22MQ IA9 999 00/220K R45 8,2MQ 1<\9 999 00/8M2
R5 1,2MQ IA9 999 00/1M2 R46 0,47MQ 1<\9 999 00/470K
R6 39000 Q IA9 999 00/39K R47 0,39MQ M 999 00/390K
R50 0,22MQ ~9 999 00/ 220K
R7 150 Q ~: 999 00/150E
R8 47000 Q 9 999 00/47K R51 0,33MQ ~r 999 00/330K
R52 1000 Q 9 999 00/1K
R9 33000 Q . ~? 999 00/33K R53 1000 Q IA9 999 00/1K
R10 4700 Q 9 999 00/4K7
R11 10 Q ~f 999 00/10E
B54 220 Q ia9 999 00/220E
R12 R55 150 Q IA9 999 00/150E
R13
10000 Q
1000 Q
1af 999 00/1 OK R56 820 Q A9 999 00/820E
9 999 00/1K
R14 2200 Q 1!.9 999 00/2K2 R57 o, 22MQ ll9 999 00/ 220K
R15 82000 Q IA9 999 00/82K R58 o,82Mr. IA9 999 00/820K
B17 0,33M.Q l.9 999 00/330K R59 47000 Q IA9 999 00/47K
R18 1 '2MQ IA9 999 00/1M2
R19 o, 1MQ IA9 999 00/100K
R20 82000 Q IA9 999 00/82K
R21 2200 Q IA9 999 00/2K2
R22 47000 Q IA9 999 00/47K
R23 10000 Q A9 999 00/1 OK DJ/HL
'
ex s4c.A.
c:::::======================r 55o
Fig.1
2
R 1S421
r L=704
L=460 /
I
I
L=17B
L
0~>-------~~~i--------~c~J
L
_;-_-_-__::-__::-__::-~~~~~·~I,___-_-_-_-----------~~
Fig.2
R 1546C
ex st.oA
--
5 S.9.10.10A.4.5. 6.6A. 7. 7A. 42.11.12 .14..15. 13. 16.17. 20. 21. 12.2 3. 24.. 25. 26. 27. 28.29. 18.19.19A. 30.31. 32.33. 34.35 .36.36A. 37.38.39.40. 41.44.4 5 2.3.3A.1.46.43.
··--···----·--·
--::c::-::-~~c--::::-=:::-=:::-::=-=-:::--.::-::---=::-~
c 7. 39. 67. 8.75.9.80.10.3.11.22.6.13.61. 27.16.15.5.6.8.12.17. 70.18.19.21. 20.23.2/..25.30.29.9.2 B. 31.32.33.34.36.38.26.li37. 66.40.42 .44.1.1. 82. 43.45.5'..4 7. 74. 48.72.50.51.52. 53. 55.56.59.57. 58.85.62.63 602 .64.1A .65 84.. 73. 81. 83.
R 3.11.2. 5.6.4. 7. 8. 4.3.9.12.10. 13. 14. 15. 16.17.18. 39.50.38.44.4 5.20.21.22.4 6. a.29 17.24.25.30.32.33.37.26.28.1. 31.57. 36.35.34. 59.4 0.4 S. 1..2 .4-i' . t, 7.51.5 2.53. 54. 56.
.J...
- - - - - - - - - - r - - - - - - - - - - - - - - - - - - - - - - - - - --j
r----1
-- -- - - - _,,__-
I
'0 .9
- ---- - -- - --- ,~- - --...,
I
C R ?
SKF3 4&·P 1 g;:
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I
I
....__
lll'r'
fdj
m! , I
:
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t I
I 9
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2. 'tO V
I
8~ (, 1~539 _1
---- 8~ ~ 5
r---+'WvW'-+--=-+
2 --- i 9 31 ~~,[~'
s 40 14
1_.
5 I< I
38 '· ! I
~.:.· I
++ I
I
+++ I
I
Fig.3
81.2.3.4.5.(;.7.8.9.11. 810
BX 640A
88
54{>
0 0 0
Fig.4
R15548
BX 640A
R 1555 0
A 8 c D i:. F G H J K L M N 0
510 510A 515 516 521 520 51. 512 5 22 :3 21. 527 526 C37 528 531 530 Ct.t. 533 C53
Ul"' lll" lll" Ul" Ul"' lll" Ul"' ur lll" [}(
ur s36
59 58 511. 517 C31
lll"
00Q3
ur
523
ur
3
l!r lU' lll'
tlrS35
531.
55 511 525 51.2 C35 C31. 529 C3 6 Cl.3 Cl.2 532 Cl.5 C72
R 1554 7
Fig.5