A. Channel A vertical pre-amplifier unit 39 A1. Input coupling 39 A2. Input attenuator 39 A3. Input source-follower 39 A4. Amplifier with gain control of lx, 2x orlOx 40 A5. Amplifier with gain control of lx or lOx 40 A6. Continuous attenuator and gain preset control 40 A7. Trigger pick-off 40 A8. Drift-reduction circuit 40 B. Channel B vertical pre-amplifier unit 41 C. Delay lines 41 D. Vertical amplifier unit 41 Dl. Principle of series and shunt feedback amplifier 41 D2. Amplifier stage for channel B 42 D3. Electronic switch 42 D4. Common amplifier stage 43 D5. Output stage 43 D5a. Series-feedback stage 43 D5b. Shunt-feedback stage 44 D5c. XY filter 44 E. Time-base unit 44 El. Trigger pulse shaper 44 Ela. Input amplifier 44 Elb. Filters 44 Elc. Differential amplifier 45 Eld. Pulse shaper 45 E2. Time-base generator 45 E3. Automatic trigger circuit 46 F. Horizontal amplifier unit 46 FI. Pre-amplifier 46 F2. Output amplifier 46 G. Switch unit 47 G1. Blocking oscillator 47 G2. Multivibrator 47 G3. Mode selector switch SKI0 48 H. C.R.T. Circuitry and power supply 48 HI. Mains transformer 48 H2. Voltage stabilizer 48 H3. Calibration voltage 49 H4. Illumination circuit 49 H5. C.r.t. circuit 49 H6. Blanking circuit 50 H6.1. Blanking of the time-base flyback 50 H6.2. Unblanking of the time-base sweep 50 H6.3. External Z modulation 50 H7. Intensity control 50 H8. Blanking during switching in position CHOPPED 51 A. Removing the bezel and the measuring graticule 52 B. Removing the knobs 52 C. Removing the top cover 53 D. Removing the bottom plate 53 E. Removing pre-amplifier unit 1 53 F. Removing vertical amplifier unit 4 54 G. Removing horizontal amplifier unit 7 54 H. Removing time-base unit 3 55 J. Removing converter unit 6 56 K. Removing delay line unit 11 57 L. Removing switch unit 5 58 M. Removing mains transformer unit 10 59 N. Removing combination unit 8 59 0. Removing the c.r.t. 62 X. Checking and adjusting 63 A. General information 63 B. Power supply 63 Bl. Mains current 63 B2. +23 V Power supply (R1108, R1114) 63 C. Cathode-ray tube circuit 63 Cl. Unblanking (R1001) 63 C2. Deflection-plate potential 63 C2a. Vertical (R602) 63 C2b. Horizontal (R959) 63 C3. Focus and astigmatism (R1044, RIO 13) 63 C4. Trace rotation (R1048) 64 C5. Intensity (R1021, R1018, R1019) 64 C6. Intensity modulation 64 C7. Distortion (R1047) 64 D. Pre-amplifiers channel A and channel B 64 Dl. Balance and gate current (R108, 109, 308, 309,143,343,150.350) 64 D2. Control amplifier (R132, R332) 64 D3. Normal-Inverted balance (R407. R1407) 65 E. Vertical and horizontal sensitivity 65 El. Channel B (R616) 65 E2. X amplifier (R944) 65 E3. Channel A 65 F. Input attenuator 65 G. Step-response of the vertical amplifiers 67 H. Bandwidth vertical amplifiers 68 I. H.F. Deflection 68 J. Rejection factor 68 K. Signal delay equality 68 L. XY Adjustment (C906, R946) 68 M. Time-base generator 69 Ml. Stability 69 M2. Trigger level (R701) 69 M3. Trigger adjustment (R743, R752) 69 M4. Trigger sensitivity 69 N. Time coefficients (R833, C823, C826) 70 0. Double traces and jitter 70 P. Mains voltage fluctuations 70 Q. Noise, convertor interference, instability and drift 70 R. Crosstalk 71 S. Brightness modulation (R1001) 71 T. Z Modulation 71 U. Output sockets 71 Ul. Calibration voltage on socket CAL. 1 V BU2 (R1136, R1138) 71 U2. Vertical output voltage on socket Y OUT BY7 71 U3. Time-base voltage on socket TIME-BASE OUT BU6 71 XI. Information for assistence in fault finding 72 A. Voltage levels and waveforms 72 B. Possible faults 72 Bl. There is no light on the c.r.t. 72 B2. There is only trace B visible 72 B3. There is only trace A visible 72 B4. Time-base does not work 72 C. Notes 73