User manual TEKTRONIX 2215

[. . . ] Chan nel 1 Vertical P ream plifier Channel 2 Vertical P reamplifier Internal Trigger P ickoff Amplifier. CHANNEL SW ITCH AN D VERTICA L O UTPU T . Inverting Am plifier an d TV Trigger Circuit . 3-4 3-4 3-4 3-4 S E CTIO N 1 S PE CI F ICATION NTROD UCTIO N . [. . . ] ADJU ST-Bot h the Grid Bias ad justment (R860) an d the AUTO FOCUS control for visible dot. Then bac k off the Grid Bias potentiometer un til the dot just disappears. Co nnect the test oscilloscope, using 1 probe, to the first test poi nt indicated in Table 5-2 and conn ect the probe grou nd lead to 501 . . CHECK-Ripple amplitude of the do su pp ly is within the typical value given in Ta ble 5-2. Repeat parts k and for each test point in Ta ble 5-2 . 4. Adjust Astigmatism a n d Auto (R887 and R875) . Set : Channel 1 AC-G ND-DC SEC/DIV TRIGGER MODE DC s AUTO Focus Trac king REV NOV 1982 5-5 Adjustment Procedure-2215 Service b . Connect leveled si ne-wave generator via 50 cable a nd 50 termination to t he CH 1 O R i np ut connector . b. C HE C K-Th at t he trace is parallel to the center h orizontal g raticule line . ADJU ST-T he fro nt- pa nel TR AC E ROTATIO N control to align th e trace with the center ho rizontal gr aticule li ne. Set: CH 1 VOLTS/DIV Ch a nnel 1 AC-GND-DC DC mV c. Adj ust Attenuator Step (11138 and R238) Balance 4. Set : CH 1 V OLTS/DIV CH 2 V OLTS/DIV AC-G N D-DC (bot h) mV 10V DC Variable Ra nge . Set the CH 1 VO LTS/DI V switch to 10 m V an d position th e trace on the center horizontal graticule li ne usi ng t he C h a nnel 1 P OSITIO N control . . Change the CH 1 VO LTS/DI V switch to 2 mV. ADJU ST-C h 1 Step ( R 138) to set the trace on the ce nter horizontal graticule line . Repeat parts b through d until there is no trace sh ift when ch angi ng t h e CH 1 VO LTS/DIV switch from 10 mV to 2 mV. b. CHE CK -Deflection accuracy is wit h i n th e limits given in Ta ble 5-3 for eac h CH 1 VOLTS/DI V switch setti ng and corresponding sta n dard-amplitude signal . Wh e n at the 20-m V VO LTS/DI V switch setting, rotate th e CH 1 VO LTS/DI V Varia ble control fu lly cou nte rcloc kwise and C HE CK that t h e dis play decreases to 2 d ivisions or less. Then return the VO LTS/DI V Variable co nt rol to the CA L detent and co ntinue with the 50-m V chec k. Table 5-3 Deflection Accuracy Limits 3% Accuracy (Divisions) 4. 85to5 . 15 3. 88to4 . 12 4. 85to5 . 15 4. 85 to 5. 15 3. 88 to 4. 12 4. 85to5 . 15 4. 85 to 5. 15 3. 88to4 . 12 4 . 85 to 5. 15 4. 85to5 . 15 3. 88 to 4 . 12 4. 85to5. 15 f. C h a n ge the VER TICA L MOD E switch to CH 2. R epeat parts b th ro ugh e for Channel 2, adjusting Ch 2 Step (R238) in step d. VOLTS/DIV Switch Setting 2 mV 5mv 10 mV 20 mV 50 mV Standard Am plitud e Signal 10 mV 20 mV 50 mV 0. 1 V 0. 2 V 0. 5 V 1V 2V 5V 10 V 20 V 50 V Deflection (Divisions) 5 4 5 5 4 5 5 4 5 5 4 5 Vertical Limits 3. [. . . ] THYRI STOR :(SEE Al OQ925 REPL) (ATTAC HING PART S) . 915, 920, 921, 934, 940, 952 REPL) . RETAINER , XSTR :POLYPHENYLENE SU LFIDE (ATTACHING PART S) . NUT, PL , ASSEM WA :6-32 0 . 312, S TL CD PL . [. . . ]