Philco L2600BU User guide

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PHOTO FACT8 Folder
PHILCO CHASSIS
13G20, 13G20C, 13G2OU
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MODEL L2602BR
CAUTION
ONE SIDE OF AC LINE CONNECTED TO CHASSIS
TRADE NAME
MANUFACTURER
TYPE SET
TUBES
POWER SUPPLY
TUNING RANGE
PHILCO Models
Chassis
L2600BU, L2602BR, L2604BK 13G20
L2600CBU, L2602CBR,L2604CBK 13G20C
UL2600BU, UL2602BR, UL2604BK 13G20U
Philco Corp., a Subsidiary of Ford Motor Co., Tioga & "C" Streets, Philadelphia,Pennsylvania
Television Receiver
VHF - Fourteen, UHF - Fifteen
110-120 Volts AC,60 Cycles RATING 110 Watts, 1.3 Amp. S) 117 Volts AC
Channels 2 thru 13 VHF, 14 thru 83 UHF,Video IF45. 75MC,Sound IF41. 25MC (Intercarrier)
SERVICING INTHE FIELD
SAFETY GLASS
The safely glass isan integralpart ofthe picturetube.
FUSE OR FUSE DEVICE
by the propersetting of the Horizontal Stabilizer Coil Slug
(Bl). (See "Chassis - Top View" Photo.)
WIDTH
A 5.6S2 fusible resistor is used forlow voltagepowersup-
ply protection.(Forlocation, see "Cabinet - Rear View".)
VHF OSCILLATOR ADJUSTMENT
Set fine tuning atthe center ofits range and adjust osc.
slug (one for each channel) for best sound and picture.
AGC
No provision is made to vary theAGCon thisreceiver.
HORIZONTAL OSCILLATOR FIELD ADJUSTMENT
Coarse adjustment ofthe horizontal hold is accomplished
The width maybe varied bya Width control. (See"Tube
PlacementChart" for location.)
FOCUS
The focus maybe varied by connecting the lead from pin4
of the picture tube to variousvoltagepoints.(Forlocation,
see "Chassis - Top View" Photo.)
CENTERING
Centering is accomplished by2 magnetic rings located on
yoke rear cover.
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HOWARD W. SAMS & CO., INC.Indianapolis 6, Indiana
The listing ofany availablereplacement part herein does not constitute
inany case a recommendation,warranty or guaranty by Howard W. Sams
& Co.,Inc., astothe quality and suitability of suchreplacement part. The
numbers of these parts havebeencompiled from informationfurnished to
Howard W. Sams & Co.,Inc., by the manufacturers of the particulartype
of replacement part listed.
MA 208
Reproduction or use, withoutexpresspermission, of editorial or pictorial ^
content, inany manner, is prohibited. No patentliability is assumed with JQ
respect totheuseofthe informationcontained herein. © 1963Howard W. ..
Sams & Co.,Inc.,Indianapolis 6, Indiana. Printed inU.S.of America
DATE 9-63
SET 652 FOLDER 2

SOUND IF
®A6GH8
AUDIO OUTPUT
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10 VAC
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^DENOTES CHASSIS GROUND
e See parts list for alternate value or application.
1. Voltagemeasurements taken withvacuumtubevoltmeter.
2.All controls setfor normal operation, no signalapplied.
3. Measuredvalues are from socket pinor terminal to common ground.
4.All terminalsviewedfrombottomunlessotherwisedesignated.
5. Numbers assigned to terminals maynotbe found onthe unit.
6. Supply voltage maintained at ratedvalue for voltagereadings.
7. Waveforms taken withcontrols setto produce 50 voltspeak-to-peak
signal at picture tube.
A PHOTOFACT STANDARD NOTATION SCHEMATIC
©HowardW, Sams & Co., Inc. 1963
TUNER SCHEMATICS PAGES 6,10,11
130V
II 90V
QV/fc
M4 TERMINAL
GUIDE
PAGE 2

TO PINS 5 OFV6
ALT. AUDIO OUTPUT
TRANSFORMER
CIRCUIT. USED IN MODELL-26MBK
114,1.11 TERMINAL
GUIDE
VIDEO OUTPUT
©A10JY8
El
mf I CONTRAST
15K TA°i? 1QK
PICTURETUBE
@16ASP4
BRIGHTNESS
250K 130V
. 022 VERT MULT-
®17JZ8\ VERTOUTPUT
"* I .005 | .ooa
-rlSOmmr .J27K
DO NOT MEASURE HV RECT
HORIZ MULT \7 \Z OUTPUT
®21GY5
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(•HORIZ HOLD
PHILCO CHASSIS
13G20,13G20C, 13G2OU
PAGE 15

TUBE PLACEMENT CHART
OFF-ON-VOLUMEVERTHOLDBRIGHTNESS CONTRAST
CHANNEL SELECTOR
/ FINE
[/ TUNING
VHF TUNER ITT-75
/
J,
TOP VIEW
INDICATES BLANK PINOR LOCATING KEY
AUDIO OUTPUT / v.
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~@] ^^
/
QUADRATURE COIL
HORIZ OUTPUT
DIODES (AFC)
\I ----- 1
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DIODE
i VIDEO DETECTOR)
/ FUSIBLE
/ RESISTOR
HORIZ HOLD
DIODE
I LV RECT)
LINEARITY
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TUBE FAILURE CHECK CHART
The following chart lists tubeswhose failures are most likely to produce indicated symptoms. Refer to tube placement chart for location and type of tube.
POWERSUPPLY FAILURE
No raster, no sound XI, R64
SWEEPFAILURE
No raster, has sound V8, V9, V10, Vll
No vertical deflection V7
Poor vert, linearity or foldover V7
Poor horiz. linearity or foldover V8, V9, V10
Narrow picture XI, V8,V9, VlO
Vert, off freq. V7
Horiz. off freq. M4,V8
LOSS OF PICTURE OR SOUND
No pic, no sound, has raster VI, V2,V3,M3 (Video Det.)
No pic, no sound, has snowV201,V202, VI
No pic, has sound, has raster V3, V12
Has pic, no sound V3, V4, V5, V6
Overloaded picture V3
SYNC FAILURE
No vert, sync V7
No horiz. sync M4, V8
No vert, or horlz. sync V4
This receiver employs tubes used ina series filamentnetwork, an openfilament inany tube will cause thesettobe inoperative. (See circuit below.)
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SET 652 FOLDER 2
PAGE 3

A Howard W. Sams I«T:Hllll:fcM J PhotoARROWS
INDICATING TUBE LOCATIONS ARE
POINTING TOPIN1 UNLESSOTHERWISE INDICATED
PIN9PIN11
PIN9
450V 70V
55V 130V
PAGE 4
PRINTED BO,

RESISTOR
I DENT.
CAPACITOR
I DENT.
PAGE 13

ALIGNMENTINSTRUCTIONS
Use an Isolation transformer and maintainvoltage at117 volts. Allow a 20-mlnute warm-upperiod forthe receiver and test equipment.
Suggested Alignment Tools: Al thru A12, Mixer Plate Coil .. GENERAL CEMENT #8606, 8606L, 8869 .. WALSCO *2543, 2544, 2588
VIDEO IF ALIGNMENT
Connect the synchronizedsweepvoltage from the sweep generator tothe horizontal input ofthe oscilloscope for horizontal deflection.
Use only enough generator output to provide a usable indication. Note: Response may varyslightly from those shown.
Connect a variable bias supply totheIFAGC line ( point <& ) and adjust to obtain a response curve which shows no indication of overload.
Disable Oscillator section of Mlxer-Osc. Setthe Channel Selector toany non-interferingchannel.
INDICATOR
Connect DC probe of
a VTVM thru a 47K
resistor to point <Q> .
Common to ground.
Connect DC probe of
a VTVM thru a 47K
resistor to point <^> .
Common to ground.
Connect vertical
input ofa scope to
point <g> . Low
side to ground.
GENERATOR
COUP1ING
Connect high side to
ungrounded tube shield
over Mixer -Osc.
Low side to ground.
Connect high side to
ungrounded tube shield
over Mlxer-Osc.
Low side to ground.
Connect high side to
ungrounded tube shield
over Mlxer-Osc.
Low side to ground.
SWEEP
GENERATOR
FREQUENCY
44MC
(10MC Sweep)
MARKER
GENERATOR
FREQUENCY
41. 25MC
47. 25MC
43. SMC
43.OMC
43. SMC
41.25MC
42. SMC
44.OMC
45. SMC
47. 25 MC
ADJUST
Al
A2.A3
A4
A5
A6,A7,
Mixer
Plate Coil
REMARKS
44.0
Adjust for MINIMUM. * ("""""N
45'5/ -> 'I42 5
Adjust for maximum. / P'° V ,
47.25 41.25
FIG. 1
Check for maximumgain and symmetry of
response with markers as shown in Figure 1 .
In order to obtain a proper response, It may
be necessary to slightly retouch A4,AS,A6,A7,
and Mixer Plate Coil.
SOUND IF ALIGNMENT
Tune ina station and adjust A8 for ma**"1"™ sound. Reduce signal strength atthe antenna terminals until distortion appears.
Continue to reduce signal whilealigning for undlstorted output by adjusting AS, A9, AID, All.
4.5 MC TRAP ALIGNMENT
Tune In a strong TV signal and set the Contrast at maximum. Adjust the Fine Tuning until a beatpattern Is visible onthe screen.
Adjust A12for MINIMUM beatinterference.
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FOCUS POINTS
CHASSIS-TOPVIEW
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SET 652 FOLDER2
PAGE 5

MIXER MIXER PLATE CO 11
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IF OUTPUT
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.001 TOFIUMENT
STRING
CHANNELSELECTOR SWITCHSHOWN IN CHANNEL 13 POSITION
A PHOTOFACTSTANDARD NOTATION SCHEMATIC
©HowardW. Sams & Co., Inc. 1963
PARTS LIST- PAGE 12
13 POSITIONSWITCH-TYPE VHP TUNER TT-75

MIXERMIXERPLATECOIL
@)A 6BL8
J( _ TUNER IF
OUTPUT
B+TO UHF TUNER
FINE TUNING
VHF TUNERPART
ITT-76
.001
A PHOTOFACT STANDARD NOTATION SCHEMATIC
CHoward W. Sams & Co.,Inc.1963
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CHANNELSELECTORSWITCHSHOWN IN CHANNEL 1 POSITION (UHF)
13 POSITIONSWITCH-TYPE VHF TUNER TT'76
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VHP TUNER TT-75
SET 65 2 FOLDER 2
PAGE 7