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Table of contents
Service Manual Circuit Diagrams Adjustment Procedure
HM303-5
St. 010998. Hüb/goRR
Y-Preamplifier CH I (YP-Board) .................................. 4 Y-Preamplifier CH II (YP-Board) ................................. 5 Y-Intermediate Amplifier and Trigger Amplifier (YP-Board) ................................................................. 6 YPA-Board (Bottom side) .......................................... 7 YPA-Board (Top side) ................................................. 8 XY-Board (X-Amplifier) ............................................... 9 XY-Board (Y-Amplifier) ............................................. 10 XY-Board (Top side) ................................................. 11 Sync.-Amplifier ........................................................ 12 Timebase ................................................................. 13 Sweep-Generator .................................................... 14 TB-Board ................................................................. 15 CRT-Board ............................................................... 16 CRT-Board (Top and Bottom side) ........................... 17 Power Supply (PS-Board) ........................................ 18 PS-Board (Bottom side) .......................................... 19 PS-Board (Top side) ................................................. 20 Component tester, Calibrator .................................. 21 CCT-Board (Top and Bottom side) ........................... 22 Front-Controlboard .................................................. 23 Front-Controlboard (Top and Bottom side) .............. 24 Adjustment procedure .......................................... 25 Interface commands ............................................. 43
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Technische Daten
Vertikal-Ablenkung
Betriebsarten: Kanal I oder II einzeln, Kanal I und Kanal II alternierend oder chop., (Chopperfrequenz ca. 0,5MHz) Summe oder Differenz von KI und KII, (beide Kanäle invertierbar), XY-Betrieb: über Kanal I und Kanal II Frequenzbereich: 2xDC bis 35MHz (-3dB) Anstiegszeit: <10ns Überschwingen: 1% Ablenkkoeffizienten: 12 kalibrierte Stellungen von 5mV/cm bis 20V/cm (1-2-5 Teilung) variabel 2,5:1 bis mindestens 50V/cm Genauigkeit der kalibrierten Stellungen: ±3% Y-Dehnung x5 (kalibriert) bis 1mV/cm ±5% im Frequenzbereich 0 - 10MHz (3dB) Eingangsimpedanz: 1M II 20pF Eingangskopplung: DC-AC-GD (Ground) Eingangsspannung: max. 400V (DC + Spitze AC)
Triggerung
Automatik (Spitzenwert): <20Hz-100MHz(5mm), Normal mit Level-Einstellung: DC->100MHz (5mm) LED-Anzeige für Triggereinsatz Flankenrichtung: positiv oder negativ, Alternierende Triggerung von KI und KII, Quellen: Kanal I, Kanal II, Netz, extern Kopplung: AC (10Hz bis 100MHz), DC (0 bis 100MHz), LF (0 bis 1,5kHz) Extern: 0,3Vss von 30Hz bis 30MHz Aktiver TV-Sync-Separator (pos. und neg.)
35MHz Standard Oszilloskop HM 303
Vertikal: 2 Kanäle, 5mV 50V/cm, mit Dehnung x5 ab 1mV/cm Zeitbasis: 0.5s 0,1µs/cm, mit Dehnung x10 bis 10ns/cm Triggerung: DC 100MHz, TV-Sync-Separator, Altern. Triggerung Komponenten-Tester, 1kHz/1MHz Kalibrator
Der neue HM303 ist der Nachfolger des bisher weltweit mehr als 180000mal verkauften HM203. Wesentliche Neuerungen betreffen vor allem die Erhöhung der Bandbreite von 20 auf 35MHz, die Erweiterung des horizontalen Ablenkbereiches bis max. 10ns/cm und eine nochmalige Verbesserung der schon seit Horizontal-Ablenkung Jahren einzigartigen Triggerung. In seiner jetzigen Ausführung eignet sich der HM303 für die Darstellung von Signalen im Frequenzbereich von DC bis ca. 100 Zeitkoeffizienten: 20 kalibrierte Stellungen MHz. von 0,2s/cm - 0,1µs/cm mit 1-2-5 Teilung Ein wesentliches Qualitätsmerkmal dieses Oszilloskops ist vor allem die Genauigkeit der kalibrierten Stellungen: ±3% hohe Übertragungsgüte der Meßverstärker mit max. 1% Überschwingen. variabel 2.5:1 bis max. 0,5s/cm Damit diese von der Tastspitze bis zum Bildschirm ständig kontrollierbar ist, mit X-Mag. x10 ±5%; 10ns/cm: ±8% besitzt der HM303 als erster seiner Preisklasse einen Kalibrator mit geringer Holdoff: variabel bis ca. 10:1 Anstiegszeit. Bandbreite X-Verstärker: 0-3MHz (-3dB) Eingang X-Verstärker über Kanal II, Wirklich außergewöhnlich ist die Triggerung des HM303. Bereits ab 5mm Empfindlichkeiten wie Kanal II Bildhöhe kann sie noch Signale bis über 100MHz triggern. Für die exakte X-Y Phasendifferenz: <3° unter 220kHz Darstellung von TV-Signalen wird ein aktiver Sync-Separator verwendet. In alternierender Betriebsart ist auch die Triggerung von zwei Signalen mit Komponententester unterschiedlicher Frequenz möglich. Wie sein Vorgänger ist das Gerät ebenfalls mit dem bewährten Komponententester ausgestattet. Seine Meßspannung ist Testspannung: ca. 6Veff (Leerlauf) jetzt amplitudenstabilisiert. Vorbildlich ist auch die Stromversorgung. Das eingeTeststrom: ca. 5mAeff (Kurzschluß) baute Schaltnetzteil arbeitet ohne Netzspannungsumschaltung immer mit dem Testfrequenz: ca. 50Hz geringstmöglichen Leistungsverbrauch. Gegen magnetische Einwirkungen von Testkabelanschluß: 2 Steckbuchsen 4mm Prüfkreis liegt einpolig an Masse (Schutzleiter) außen ist die Strahlröhre des HM303 mit Mumetall abgeschirmt. Alles in allem hat HAMEG mit diesem Gerät wieder einmal Maßstäbe Verschiedenes gesetzt, die entsprechend seinem Preis-/Leistungs-Standard einfach beispiellos sind. Kenner werden von den Eigenschaften des neuen HM303 begeistert sein.
Röhre: D14-364GY/123 oder ER151-GH/-, Rechteckform (8x10cm), Innenraster Beschleunigungsspannung: ca. 2000V Strahldrehung: auf Frontseite einstellbar Kalibrator: Rechteckgenerator (ta <4ns) 1kHz / 1MHz; Ausgang: 0,2V ±1% und 2V Netzanschluß: 100-240V ~±10%, 50/60Hz Leistungsaufnahme: ca. 36 Watt bei 50Hz Zul. Umgebungstemperatur: 0°C...+40°C Schutzart: Schutzklasse I (IEC1010-1/VDE 0411) Gewicht: ca. 5,6kg, Farbe: techno-braun Gehäuse: B 285, H 125, T 380 mm Mit verstellbarem Aufstell-Tragegriff
Foto: 1MHz Rechteck-Signal Foto: 50MHz und 100MHz Sinus-Signal mit alternierender Triggerung
01/98
Inkl. Zubehör: Netzkabel, Betriebsanleitung, 2 Tastköpfe 1:1/10:1
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3
Y-Preamplifier CH I (YP-Board)
4
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Y-Preamplifier CH II (YP-Board)
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5
Y-Intermediate Amplifier and Trigger Amplifier (YP-Board)
6
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YPA-Board (Bottom side)
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YPA-Board (Top side)
8
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XY- Amplifier
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9
XY Board (Y Amplifier)
10
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XY Board (Top and Bottom side)
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11
Sync.- Amplifier
12
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Timebase
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Sweep- Generator
14
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TB Board
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CRT- Board
16
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CRT Board (Top and Bottom side)
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3
T1012 BC850c SOT-23
2
1
4 MPT 7
1
2
4
5
1
6
IC1001
1
R1047 22K1
+
1
3
L1001 2x33mH 1A
2
2 1 MPT3
B1007 D1003 BYV27-100 C1021 100p 2kV
MPT 8
C1022 330u 25V
2
+
3
4
2
2
4
3
CNY17-2Z
U
R1030 681R R1035 22R
3 20
R1002 VR37 332K 6.3V P1010 WIRE6 P1003 WIRE6 D1014 BYD37M
5
D1013 LL4151
BLV HT14
R1073 1K0 R207
MPT11
R1025 27k4
C1038 1u 50V
+ 3
R1074 75K
1
2
6
3
2
3
7
S1001 NT
17 1 14 2 2
4
MPT 4
3
C1018 10n 400V
18
1
18
6 5 4 3 2 MPT 5 1 2
8
7
D1020 BYD37M B1011 +12V D1023 LL4151 R1070 1K00 C1032 100u 16V C1045 0.1u 50V R1072 3K32
3 D + 6 MPT 6
L1007 68uH 1.5A C1036 10u 250V +185V R1066 7K50 T1004 BD434 TO-126
3
1 MPT 9
D1021 BYD37M
7
L1006 68uH 1.5A
+
R1016 1K0
DR1001 ETD39/303
8
C1028 22u 160V C1031 22u 160V
1
+
C1030 10u 250V C1037 0.1u 250V MKT IC1005 TL431C T O - 9 2A R1062 619R R1071 1K0
+
+
+141V R1063 2k21
D
C1001 4700p Y 250V B1010 R1068 1K3 BYV27-100 +13.5V
+ 9
MPT 1
L1003 220uH 1A L1005 68uH 1.5A
+
F1001 0.5AF
C1025 68u 400V R1065 R1018 1K3 100K 411 C1035 10n 400V MKT D1004 C1026 330u 25V D1015 LL4151 R1054 3K01 R1053 619R T1010 BC850c SOT-23
1 2 5 3 3 1 T1008 BC860c SOT-23 2 1
R1050 332K C1033 0.1u 400V MKT C1029 1000u 16V R1017 100K 411 8 D1022 BYD77G
10
R1049 56K2
Power Supply (PS-Board)
D1001 FL406
2
3
+
+
C1011 68u 400V
+12V R1061 10K0
R1048 301K C1027 220p 400V D1017 BYD37M D1019 BYD77G C1023 1000u 16V R1052 511R R1043 7K50 T1002 BD433 TO-126 IC1004A R1055 TL082CN 3 511R +
2
R1013 200K R207
R1019 1K00
C1002 0.1u X2 250V
LINE
D1006 LL4151
R1037 8K25
C1046 0.1u 50V C1034 C1042 1n 50V R1056 10K0
+ 100u 16V
C
-12V C
MPT 10 MPT13
C1005 2200p Y 250V -13.5V
3
T1003 STHV82FI ISOWATT 218 T1009 3 BC860c 1 SOT-23 L1004 68uH 1.5A R1014 0R39 R1051 12K1
2
R1031 200K
1
T1011 BC850c SOT-23 R1059 1K00 R1015 0R22 2W
+
D1009 BYD37M
HT1
MPT12
C1003 0.33u X2 250V C1044 1n 50V R1060 4K99 D1012 BYT01-400
1 21
R1005 S14K275 31V
R1001 NTC 8
R1021 75K 3
2
T1001 BUX86 TO-126
C1039 4n7 50V
BLV HT1 C1015 100u 16V R1022 1K82
+
P1002 MOLEX6S C1009 100u 35V
R1020 75K
1
G1 -1950V HT14
1 2 3 4 5 6
MPT 2
12.9V
MPT16
3
IC1003
8
R1010 90R9 R207
19
C1016 0.1u 100V R1006 470K -2025V HVC
MPT14 MPT 17
2
R1029 1M00 B1001 D1010 BZV55C75 R1004 470K C1019 10n 2kV R1040 10K0 R1041 475K C1010 0.1u 100V G1 C1043 10n 50V
MPT 15
T1006 BF822 FOKUS T1005 1 BC860 c D1005 SOT-23 LL4151 R1003 470K R1024 1M00 R1036 750K -1950V C1007 10n 400V
B
C1006 2200p Y 250V R1045 10K0 D1016 DD1400
13
B
D1007 BZV55B16 R1008 D1011 R1038 R1032 R1026 R1033 1K0 BAS20 47K5 1K82 1 0R0 5K11 3 2
R1009 90R9 R207
1 2 3 4 5 6
1 2 3 4 5 6
0.4V IC1002 TL431C T O - 9 2A C1017 + 1u 50V C1012 1n 250V
16 15
750K R1023 R1042 750K R1012 6M81 VR37 C1024 68p 3KV R1044 475K
1M00 R1028
+
D1024 DD1400
R1039 200R
1M00 R1007 0R0 R1027
P1001 Power Recept.
C1020 220u 16V
C1040 C1041 0.1u 50V 0.1u 50V
D1025 DD1400 D1027 BYD37M
2
7
+
5
R1057 4K32 D1026BYD37M T1007 BF822 SOT-23 R1046 22K1
-
6
R1058 750K R1064 47K5 D1018 LL4151 R1069 8K25 +12V IC1004B TL082CN R1067 1K00
1M00 R1034 VR37 10M0 R1011 C1004 47n 2kV P1009 WIRE6 +185V +141V P1008 WIRE6
R
A
B1013 B1003 LINE B1008 B1009
+13.5V P1005 WIRE6
A Title : Rev.:
8 +Vcc
IC1004C TL082CN +12V -12V
-Vcc 4
6 5 4 3 2 1
+12V -12V
6 5 4 3 2 1
+12V -12V
6 5 4 3 2 1
Date : Document Number :
-13.5V
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8
7
4
3
2
1
PS-Board (Top side)
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PS Board (Bottom side)
20
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Component tester, Calibrator
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CCT Board (Top and Bottom side)
22
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Front- control board
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Front Control board (Top and Bottomside)
24
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Adjustment Procedure
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ADJUSTMENT PROCEDURE
30MHz Standard Oscilloscope HM303-5 WARNING The Instrument must be disconnected from the mains power supply whenever you open the case, repair or exchange parts.
HIGH VOLTAGE WARNING!
Hazardous High Voltage of up to 2,000 Volts is present inside this Instrument. The areas particularly affected by High Voltage are the high voltage circuit on the PS-board, the CRT-board and the CRTsocket.
SERVICE AND ADJUSTMENT
· of this instrument should only be performed in accordance and in conjunction with the operating manual and the WARNINGS contained therein. · should only be performed by suitable qualified and experienced service personnel, or should be referred to one of the HAMEG companies listed on the rear cover of the manual.
Test Instruments required:
1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) 12) 13) 14) Scope Tester HZ60-2. Constant amplitude sinewave generator, 20Hz - 250MHz, output 5mV - 5V into 50, preferably with 20dB attenuation (e.g. HM8133, TEK SG502 + TEK SG503). Amplitude Calibrator with 1kHz squarewave output and 600 impedance, risetime faster than 150ns.Output voltage 2mV - 20Volts in 1-2-5 sequence for 4 divisions display amplitude (e.g. HZ62, TEK PG506). Time mark generator from 5ns/div to 5s/div. Output min. 10mV into 50 (e.g. HZ62, TEK TG501). Pre-attenuator 2:1 (1M , 12-48pF), e.g. HZ20. 50 BNC through termination, e.g. HZ22. 2 BNC-cables, 50, e.g. HZ34. BNC-T-connector. Oscilloscope probe 10:1, with exactly 9M series resistance and compensated for test oscilloscope mentioned under 10). Oscilloscope 100MHz, 5mV/div to 5V/div, e.g. HM1005. Trimming/adjusting tool. Variable output safety insulation transformer. Video signal generator with positive and negative signal output. Yt-EPROM HM1007.
This procedure covers all adjustments and the most important - but not all - performance checks. The correct sequence of all adjustment steps must be strictly followed. Exact adjustment is only possible when any influence of the earths` magnetic field has been compensated with the trimmer marked TR (trace rotation). All adjustments should only be performed by qualified and experienced personnel. This is particularly important for adjustments in the high voltage section of the instrument.
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Table of Contents (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21) (22) (23) (24) (25) (26) (27) (28) (29) (30) (31) (32) (33) (34) (35) (36) (37) (38) (39) (40) (41) R1008: +141 Volt supply. ............................................................................ 29 R1016: +12 Volt supply. .............................................................................. 29 VR7000: Trace Rotation Check. .................................................................. 29 R1004 : CRT minimum intensity. ................................................................ 29 R712RT maximum intensity. ....................................................................... 29 R712: Mean Y-plate Potential Channel I. .................................................... 29 R714: Mean Y-plate Potential Channel II. ................................................... 29 RV6021 : Astigmatism correction. .............................................................. 31 R640: Y-Gain CH I. ...................................................................................... 31 R122: FET operating point CH I. ................................................................. 31 R203: Invert-Balance CH I. ......................................................................... 31 R177: Variable-Balance CH I. ...................................................................... 31 R139: 100Hz Squarewave 5mV/div CH I. ................................................... 32 R134: 100Hz Squarewave 1mV/div Adjustment CH I. ............................... 33 R658: Y-Gain CH II. ..................................................................................... 33 R422: FET operating point CH II. ................................................................ 33 R503: Invert-Balance CH II. ........................................................................ 33 R477: Variable-Balance CH II. ..................................................................... 33 R439: 100Hz Squarewave 5mV/div CH II. .................................................. 33 R434: 100Hz Squarewave 1mV/div CH II. .................................................. 33 RV2005 (A), RV2006 (C), CV2000 (D) and CV2001 (B): Y-Final Amplifier. .. 35 Y-Amplifier Bandwidth Check. .................................................................... 35 C113/111/102/105: Attenuator Compensation CH I. .................................. 35 C413/411/402/405: Attenuator Compensation CH II. ................................. 35 R663: ADDition/Offset. ............................................................................... 37 RV2417 (A), RV2418 (B): Overscan. ........................................................... 37 RV3519: Sweep start voltage. .................................................................... 37 RV2225: X-Magnification x1. ...................................................................... 37 RV2260: X-Symmetry. ................................................................................ 37 RV3591 (A)/3589 (C), CV3511 (B): Time base. ........................................... 37 RV2234: X-Magnification x10. .................................................................... 39 R624: XY-Gain ............................................................................................. 39 RV3293: Trigger-Symmetry ......................................................................... 39 R612: DC-Triggering CH I. .......................................................................... 39 R603: DC-Triggering CH II. ......................................................................... 39 RV2301 (A), 4322 (B): Component Tester Y-Position and Tilt. .................... 41 VR8940: Calibrator Output. ........................................................................ 41 Trigger Filter Check. .................................................................................... 41 Triggerbandwidth Check. ............................................................................ 41 External Trigger Check. ............................................................................... 41 Video Trigger Check. ................................................................................... 42
NOTE The adjustment procedures assume that the instrument had once been properly adjusted in the factory and adjustments are required due to temperature drift or the replacement of defective components. Before starting each adjustment procedure, set the oscilloscope to the following basic settings: · Press POWER pushbutton (in!). · Release all other pushbuttons (out!) except AC/DC input coupling. · Rotate the three variable controls (TIME/DIV. and VOLTS/DIV.) to their (calibrated) detent positions. · Set TIME/DIV. switch to 50µs/div. · Set both VOLTS/DIV switches to 5mV/div. · Rotate the HOLD OFF knob fully counterclockwise. · Trigger coupling set to AC. · Set all other controls to their midrange positions. If different settings are required, they are mentioned particularly for each subject.
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PS-Board
3
Front panel
1
2
7
YPA-Board
6
PS-Board
XY-Board
5
4
Pin 2
Pin 4
28
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(1)
R1008: +141 Volt supply.
WARNING: To avoid damage use a fully insulated screwdriver! Locate and identify R1008 (1) on PS-Board (screened section). Locate 8 pole checkpoint socket on XY-Board and identify pin 2. Adjust R1008 (1) for exactly +141Volts (± 0.1 Volt).
(2)
R1016: +12 Volt supply.
Locate and identify R1016 (2) on PS-Board. Locate 8 pole checkpoint socket on XY-Board and identify pin 4. Adjust R1016 (2) for exactly +12Volts (± 10mV). All other voltages +185V (pin 1), -12V (pin 5) and -1950V on cathode of CRT depend on the correct +12 Volt adjustment. All these voltages must be checked and verified.
(3)
VR7000: Trace Rotation Check.
Locate and identify VR703 (3) ,,TR" on the front panel. Using Y-Pos.I and X-Pos. controls, move baseline to the center of the graticule. Press channel I GD pushbutton (in!). When turning VR703 (3), check that the range of inclination of the baseline is at least 1mm at both horizontal limits of the graticule. Readjust baseline exactly parallel to the horizontal center line of the graticule.
(4)
R1004 : CRT minimum intensity.
Locate and identify R1004 (4) on PS-Board. Set INTENS. control to fully left position. Press XY pushbutton (in!). Adjust R1004 (4) so that the dot just disappears. Release XY pushbutton.
(5)
R1003 : CRT maximum intensity.
Locate and identify R1003 (5) on PS-Board. Set INTENS. control to fully right position. Set FOCUS knob on the front panel for optimum sharpness. Adjust R1004 (5) so that the beam diameter is 1.5mm. Repeat adjustment 4 and 5 until optimum is obtained!
(6)
R712: Mean Y-plate Potential Channel I.
Locate and identify R712 (6) on YPA-Board. Press DUAL pushbutton (in!). Set both beams to the horizontal center line of the graticule by using Y-position I and II knobs on the front panel. The Y-position knob settings must not be changed during the following procedure until item 7) is finished. Release DUAL pushbutton (out!). Switch the oscilloscope OFF. Locate and identify both lines from the Y-final amplifier to the Y-plates of the CRT. Connect both lines (short)galvanically. Switch the oscilloscope ON. Measure the DC voltage at the Y-plates in respect to ground. Adjust R712 (6) for +85Volt Y-plate voltage. Note: Do not remove the short at the Y-plates until item 7) is finished.
(7)
R714: Mean Y-plate Potential Channel II.
Note: Do not start item 7) until item 6) is finished. Locate and identify R714 (7) on YPA-Board. Press CHI/II pushbutton (in!) for channel II mode. Measure the DC voltage at the Y-plates in respect to ground. Adjust R714 (7) for +85Volt Y-plate voltage. Switch the oscilloscope OFF. Remove the connection between both Y-plates. Switch the oscilloscope ON.
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7
12
11
9
YPA-Board
10
PS-Board
8
30
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(8)
RV6021 : Astigmatism correction.
Locate and identify RV6021 (8) on CRT-Board. Connect a 1MHz squarewave signal with 25mVpp at 50 (HZ22) to input CHI. Set time base to 0.1µs/div. Adjust FOCUS control for optimum sharpness. Adjust RV6021 (8) until leading edge and top of signal have equal sharpness. Recheck range of FOCUS control. Adjust FOCUS control for optimum sharpness.
(9)
R640: Y-Gain CH I.
Locate and identify R640 (9) on YPA-Board. Connect a 25mV/1kHz squarewave signal via 50 cable and 50 through terminator to input channel I. Set time base to 1ms/div. Adjust R640 (9) for 5 division signal height.
(10) R122: FET operating point CH I.
Locate and identify R122 (10) in CH I section of the YPA-Board. Release all pushbuttons (out!) for channel I mode. Press Y x5 channel I (in!) for 1mV/div. Press GD pushbutton channel I (in!). Switch the attenuator channel I constantly between 5mV/div (1mV) and 10mV/div (2mV). Adjust R122 (10) until no Y-position change occurs. Do not change the operating conditions.
(11) R203: Invert-Balance CH I.
Press GD pushbutton channel I (in!). Press Y x5 channel I (in!) for 1mV/div. Using Y-POS.I control set trace to the horizontal center line. Locate and identify R203 (11) on YPA-Board. Adjust R203 (11) so that the baseline will not move, when pressing and releasing the INVERT CH I pushbutton.
(12) R177: Variable-Balance CH I.
Locate and identify VR177 (12) in CH I section of the YPA-Board. Press channel I Y-MAG. x5 pushbutton for 1mV/div. Press channel I GD pushbutton (in!). Adjust VR177 (12) so that the baseline will not move when turning the channel I Y-variable control through the entire range. Check adjustment 11) again and repeat it if required.
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15
17
18
YPA-Board
20
14
19
16
13
(13) R139: 100Hz Squarewave 5mV/div CH I.
Locate and identify R139 (13) in CH I section of the YPA-Board. Connect a 25mV/100Hz squarewave signal via 50 cable and 50 through terminator to input channel I. Set time base to 2ms/div. Check that DC input coupling is selected. Adjust R139 (13) for flat top.
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(14) R134: 100Hz Squarewave 1mV/div Adjustment CH I.
Locate and identify R134 (14) in CH I section of the YPA-Board. Connect a 5mV/100Hz squarewave signal via 50 cable and 50 through terminator to input channel I. Press Yx5 channel I (in!) for 1mV/div. Set time base to 2ms/div. Check that DC input coupling is selected. Adjust R134 (14) for flat top.
(15) R658: Y-Gain CH II.
Locate and identify R658 (15) on YPA-Board. Connect a 25mV/1kHz squarewave signal via 50 cable and 50 through terminator to input channel II. Check that DC input coupling is selected. Set time base to 1ms/div. Adjust R658 (15) for 5 division signal height.
(16) R422: FET operating point CH II.
Locate and identify R422 (16) in CH II section of the YPA-Board. Press CHI/II pushbutton (in!) for channel II mode. Press Y x5 channel II (in!) for 1mV/div. Press GD pushbutton channel II (in!). Switch the attenuator channel II constantly between 5mV/div (1mV) and 10mV/div (2mV). Adjust R422 (16) until no Y-position change occurs.
(17) R503: Invert-Balance CH II.
Press GD pushbutton channel II (in!). Press Y x5 channel II (in!) for 1mV/div. Using Y-POS.II control set trace to the horizontal center line. Locate and identify R503 (17) on YPA-Board. Adjust R503 (17) so that the baseline will not move, when pressing and releasing the INVERT CH II pushbutton.
(18) R477: Variable-Balance CH II.
Locate and identify VR477 (18) in CH II section of the YPA-Board. Press channel II Y-MAG. x5 pushbutton for 1mV/div. Press channel II GD pushbutton (in!). Adjust VR477 (18) so that the baseline will not move when turning the channel I Y-variable control through the entire range. Check adjustment 17) again and repeat it if required.
(19) R439: 100Hz Squarewave 5mV/div CH II.
Locate and identify R439 (19) in CH II section of the YPA-Board. Connect a 25mV/100Hz squarewave signal via 50 cable and 50 through terminator to input channel II. Set time base to 2ms/div. Check that DC input coupling is selected. Adjust R439 (19) for flat top.
(20) R434: 100Hz Squarewave 1mV/div CH II.
Locate and identify R434 (20) in CH II section of the YPA-Board. Connect a 5mV/100Hz squarewave signal via 50 cable and 50 through terminator to input channel II. Press Yx5 channel II (in!) for 1mV/div. Set time base to 2ms/div. Check that DC input coupling is selected. Adjust R434 (20) for flat top.
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33
XY-Board
YPA-Board
A
C
D 24
B
B
D 23
C
A
34
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(21) RV2005 (A), RV2006 (C), CV2000 (D) and CV2001 (B): Y-Final Amplifier.
Connect a 1MHz squarewave signal of 25mV via 50 cable and 50 through termination to input CH I. Check that DC input coupling is selected. Set time base to 0.2µs/div. Locate and identify the adjustment points RV2005 (21A), RV2006 (21B), CV2000 (21C) and CV2001 (21D) on XY-Board. As the capacitive influence of the cabinet is of importance, a metal sheet above the Y-final amplifier section is required. Adjust RV2005 (21A) and CV2001 (21B) for flat top, RV2006 (21C) and CV2000 (21D) for fast leading edge with minimum overshoot. Repeat until optimum is obtained. Check channel II under the same conditions.
(22) Y-Amplifier Bandwidth Check.
Connect a 40mVpp/50kHz sinewave signal from a constant amplitude generator via a 50 throughtermination to the input of channel I. Adjust the generator amplitude for 8 div. display height on the screen. Increase the generator frequency until the signal is displayed with 5.6 div. height ( -3dB). Repeat the adjustment under item 21), if the frequency reading on the generator shows a value less than 30MHz. Press CHI/II-TRIGI/II pushbutton (in!). Connect a 40mVpp/50kHz sinewave signal from a constant amplitude generator via a 50 throughtermination to the input of channel II. Adjust the generator amplitude for 8 div. signal height displayed on the screen. Increase the generator frequency until the signal is displayed with 5.6 div. height ( -3dB). Repeat the adjustments under item 21), if the frequency reading on the generator shows a value less than 30MHz.
(23) C113/111/102/105: Attenuator Compensation CH I.
Locate and identify trimmers VC102-113 for CH I on YPA-Board. Check that DC input coupling is selected. Check that input attenuator CH I is in 5mV/div setting. Set time base switch to 0.5ms/div. Set amplitude calibrator to 1kHz and connect a 2:1 pre-attenuator via 50 cable to input of CH I. Set calibrator output voltage to 80mVpp (40mVpp at the 2:1 pre-attenuator output, if terminated with 1M). Adjust trimmer in pre-attenuator for flat squarewave top. This adjustment must not be changed during the following procedure. Adjust compensation as listed in the table below: Scope Input 250mVpp 2.5Vpp Input Atten. 50mV/div 0.5V/div Adjustment CH I A (VC111) flat top + B (VC113) leading edge C (VC102) flat top + D (VC105) leading edge
(24) C413/411/402/405: Attenuator Compensation CH II.
Locate and identify trimmers VC402-413 for CH II on YPA-Board. Check that DC input coupling is selected. Check that input attenuator CH II is in 5mV/div setting. Set time base switch to 0.5ms/div. Set amplitude calibrator to 1kHz and connect a 2:1 pre-attenuator via 50 cable to input of CH II. Set calibrator output voltage to 80mVpp (40mVpp at the 2:1 pre-attenuator output, if terminated with 1M). Adjust trimmer in pre-attenuator for flat squarewave top. This adjustment must not be changed during the following procedure. Adjust compensation as listed in the table below: Scope Input 250mVpp 2.5Vpp
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Input Atten. 50mV/div 0.5V/div
Adjustment CH II A (VC411) flat top + B (VC413) leading edge C (VC402) flat top + D (VC405) leading edge 35
25
YPA-Board
XY-Board
TB-Board
27
30
B
A
C
36
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(25) R663: ADDition/Offset.
Press DUAL pushbutton (in!). Locate and identify R663 (25) on YPA-Board. Set input coupling CH I and II to GD. Move both baselines with Y-POS. I and II controls to the horizontal center line of the graticule. Release DUAL pushbutton (out!). Press ADD pushbutton (in!). Adjust R663 (25) for the same signal position as before in DUAL mode.
(26) RV2417 (A), RV2418 (B): Overscan.
Locate and identify RV2417 (26A) and RV2418 (26B)on XY-Board. Press channel I and channel II GD pushbuttons (in!). Press DUAL pushbutton (in!). Set baseline with Y-POS.I control to the top line of the graticule. Set baseline with Y-POS.II control to the bottom line of the graticule. Adjust RV2417 (26A) for just lighting up of the upper LED. Adjust RV2418 (26B) for just lighting up of the lower LED. Repeat both procedures until both adjustments are correct.
(27) RV3519: Sweep start voltage.
Locate and identify RV3519 (27) on TB-Board. Set time base to .2ms/div. Locate and identify pin 7 of test socket on XY-Board. Use a control oscilloscope with a x10 (10:1) probe and measure under DC input coupling conditions the sawtooth voltage at pin 7. Adjust RV3519 (27) for 0 volts DC at the sawtooth start (end of the hold off time).
(28) RV2225: X-Magnification x1.
Locate and identify RV2225 (28) on XY-Board. Set time base to .2ms/div. Adjust RV2225 (28) for 10.2 div sweep length.
(29) RV2260: X-Symmetry.
Locate and identify RV2260 (29) on XY-Board. Set the X-POS. knob to the mechanical center position. Adjust RV2260 (29) for a symmetrical trace position in respect to the graticule.
(30) RV3591 (A)/3589 (C), CV3511 (B): Time base.
a) Locate and identify RV3591 (A) on TB-Board. Set time mark generator to f= 20kHz and connect signal to CH I input. Set time base to 50µs/div. Move trace with X-Pos. control so that the first time mark coincides with the first left graticule line of the screen. Adjust RV3591 (30A) so that the 11th time mark coincides with the last right graticule line. Rotate time base variable control to fully left position. Now more than 2.5 time marks per division should be displayed. b) Locate and identify CV3511 (30B) on TB-Board. Set time base to 0.5µs/div. and time base variable control to CAL position. Set time mark generator to f= 2MHz. Move trace with X-POS. control so that the first time mark coincides with the first left graticule line of the screen. Adjust CV3511 (30B) so that the 11th time mark coincides with the last right graticule line. c) Locate and identify RV3589 (30C) on TB-Board. Set time base to 5ms/div. and time base variable control to CAL position. Set time mark generator to f= 200Hz. Move trace with X-POS. control so that the first time mark coincides with the first left graticule line of the screen. Adjust RV3589 (30C) so that the 11th time mark coincides with the last right graticule line. Check all time base settings with suitable time mark signals.
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37
35
32
34
YPA-Board
TB-Board
XY-Board
33
38
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(31) RV2234: X-Magnification x10.
Locate and identify RV2234 (31) on XY-Board. Press pushbutton X-Mag. x10. Set time base to 50µs/div. Set time mark generator to f= 20kHz and connect signal to CH I input. Set X-POS control to mechanical center. Using X-POS control, move the visible time mark to the first left graticule line. Adjust RV2234 (31) so that the next time mark coincides with the last (right) graticule line. Release X-MAG. x10 pushbutton (out!).
(32) R624: XY-Gain
Connect a 1kHz squarewave signal of 25mVpp amplitude (HZ60-2) to input CH II. Check that the CH II input sensitivity is 5mV/div. Check that DC input coupling is selected. Locate and identify R624 (32) on YPA-Board. Press XY pushbutton. Set X-POS control that the left dot coincides with the graticule center. Adjust R624 (32) for a distance of 5 division between left and right dot.
(33) RV3293: Trigger-Symmetry
Locate and identify RV3293 (33) on TB-Board. Connect a 50kHz sinewave signal of 40mVpp amplitude to input CH I. Set input coupling CH I to AC. Check that trigger coupling is in AC position. Set attenuator switch CH I to 0.1V/div (calibrated position). Press AT/NORM. pushbutton (in!). Turn LEVEL control for triggering (center position). Reduce signal height and correct LEVEL setting for just triggering with a minimum signal height. Press and release the trigger SLOPE ± pushbutton and adjust RV3293 (33) for stable triggering in both SLOPE conditions.
(34) R612: DC-Triggering CH I.
Locate and identify R612 (34) on YPA-Board. Connect a 50kHz sinwave signal to input CH I. Set generator amplitude to 8cm. Set time base to 10µs/div. Press AT/NORM. pushbutton (in!). Turn LEVEL control to the center position. Release AC/DC input coupling pushbutton CH I (out!). Constantly switch between AC and DC trigger coupling and watch the trace start position. Adjust R612 (34) so that there is no difference regarding the signal start position on the signal slope between DC and AC trigger coupling.
(35) R603: DC-Triggering CH II.
Locate and identify R603 (35) on YPA-Board. Connect a 50kHz sinwave signal to input CH II. Press CH I/II-TRIG I/II pushbutton (in!). Set generator amplitude to 8cm. Set time base to 10µs/div. Press AT/NORM. pushbutton (in!). Turn LEVEL control to the center position. Release AC/DC input coupling pushbutton CH II (out!). Constantly switch between AC and DC trigger coupling and watch the trace start position. Adjust R603 ( 35) so that there is no difference regarding the signal start position on the signal slope between DC and AC trigger coupling.
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39
XY-Board
CT-Board
37
Pin 1
Pin 14
36B
40
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(36) RV2301 (A), 4322 (B): Component Tester Y-Position and Tilt.
Release all pushbuttons (out!). Press COMPONENT TESTER pushbutton (in!). Locate and identify RV2301 (36A) on XY-Board. Adjust RV2301 (36A) to shift the approx. 8 div. horizontal component tester trace to the horizontal center of the CRT graticule. Locate and identify RV4322 (36B) on CC-Board. Set up the instrument on a table in normal operating conditions to avoid misadjustment due to the influence of the earth magnetic field. Adjust RV4322 (36B) in such a way that the trace is parallel to the horizontal graticule center line and not tilt. This adjustment
(37) VR8940: Calibrator Output.
Locate and identify VR8940 (37) on CC-Board. Connect a digital multimeter to the 0.2Vpp calibrator output. Set up the digital multimeter for DC measurement in a suited sensitivity setting. Locate and identify IC8903 on CC-Board. Connect pin 1 and pin 14 of IC8903 galvanically together. Adjust VR8940 (37) for exactly 0.2V DC. Check 2V calibrator output. Remove the connection between pin 1 and pin 14 of IC8903. Connect a 10:1 probe to the 0.2Vpp calibrator output and connect it to the CH I input of the scope. Release all pushbuttons (out!). Select CH I DC input coupling. Set attenuator CH I to 5mV/div (calibrated detent). Set time base to 0.2ms/div. Now approximately 2 signal periods should be visible on the screen. Press 1kHz/1MHz pushbutton (in!). Set time base to 0.5µs position. Check 1MHz calbrator signal. Please note: Neither the calibrator frequency nor the pulse duty factor are specified.
(38) Trigger Filter Check.
Set time base to 1ms/div. Connect a 1kHz sinewave signal of 40mVpp amplitude to input CH I and check for full screen deflection. Set input attenuator CH I to 50mV/div and check for 8mm display height. Select trigger coupling from AC to DC and LF. The signal must always trigger . Set sinewave generator to 50kHz and 40mV output amplitude and check for 8mm display height. Select trigger coupling from AC to DC. The signal must always trigger. Select LF trigger coupling. Now the signal should not trigger.
(39) Triggerbandwidth Check.
Set time base to 0.05µs/div, time base variable to CAL position. Set input coupling switch CH I to DC. Set trigger coupling to AC. Release AUTO/NORM pushbutton (out!). Set input attenuator CH I to 5mV/div. Connect a 100MHz sinewave signal to input CH I. Adjust generator output for 5mm display height. The signal must be triggered.
(40) External Trigger Check.
Set time base to 20µs/div. Set input attenuator CH I to 0.1V/div. Connect a 50 kHz sinewave signal via a 50-Ohm through terminator with an amplitude of 280mVpp (100mVrms) to input CH I and check for 2.8div display height. Set LEVEL to midrange position. Check that the Trigger-LED is ON. Press EXT. pushbutton. The Trigger-LED (TR) should now be OFF.
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41
Set input coupling CH I to GD. Remove signal cable from input CH I and connect it to TRIG.INP. socket. Do not change generator settings. Now the Trigger-LED should be ON again.
(41) Video Trigger Check.
Set CH I input coupling switch to DC. Connect video signal with positiv sync. pulses to input CH I. Adjust input attenuator switch CH I for 1 div display amplitude of video signal. Set time base to 5ms/div ( time base 1ms/div = frame triggering). Set trigger coupling switch to TV. Check that trigger starts with vertical sync. pulses. Now approx. 2.5 frames should be visible. Change polarity of video signal. Press SLOPE pushbutton (in!). Again approx. 2.5 frames should be displayed triggered. Set time base to 20µs/div ( time base range 0.5ms/div - 0.1µs/div = line triggering). Recheck trigger SLOPE pushbutton procedure, using video signal with polarity change. Note: Invert pushbutton does not affect trigger polarity.
42
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