Preparation For Adjustment; Index To Adjustment Procedure - Tektronix 2246 1Y Service Manual

Specific interactions are called out within certain
adjustment steps to indicate that the adjustments
must be repeated until no further improvement is
noted.

PREPARATION FOR ADJUSTMENT

It is necessary to remove the cabinet to do the
Adjustment Procedure. See the cabinet removal
instructions in the Maintenance section
manual.
All test equipment items required to do the com ­
plete Adjustment Procedure are described in Table
4-1 at the beginning of Section 4, Performance
Check Procedure. The specific items of equipment
needed to do each subsection in this procedure are
listed at the beginning of that subsection.
Connect the test equipment and the 2246 1Y or
2246 Mod A to an appropriate ac-power source and
allow 20 minutes warmup
adjustments.

INDEX TO ADJUSTMENT PROCEDURE

P O W E R S U P P L Y , D I S P L A Y , A N D Z - A X I S
1. Power Supply DC Levels (R2252) ............... 5-4
2. Grid Bias (R2719) .............................................
3. Astigmatism (R2788)
4. Trace Rotation (Front Panel) ......................... 5-5
5. Geometry (R2784) .........................................
6. Z-axis Response (C2704)
7. Readout Jitter (R724) .................................... 5-6
V E R T I C A L
1. Vertical Output Gain (R703) And Readout
Vertical Centering (R 2 6 0 ).............................. 5-7
A djustm ent Procedure-2246 1Y and 2246 Mod A Service
of this
before making any
5-5
5-5
....................................
5-5
............................ 5-5
2. CH 1 Step Balance (R12) ..................
3. CH 2 Step Balance (R22) ...........................
4. CH 3 Step Balance (R141) .........................
5. CH 4 Step Balance (R161) .........................
6. CH 1 MF/LF Gain (R13) And
Compensation ( C l ) ....................................... 5-8
7. CH 1 Input Capacitance (Cl 1 4 ) .................
8. CH 1 Input Compensation X I 0 (Cl 1) . . . .
9. CH 1 Input Compensation X I 00 (CIO) . . . 5-8
10. CH 1 Gain (R211) ......................................... 5-8
11. CH 2 MF/LF Gain (R23) And
Compensation ( C 2 ) ....................................... 5-8
12. CH 2 Input Capacitance ( C l2 4 ) .................
13. CH 2 Input Compensation X I 0 (C21) . . . .
14. CH 2 Input Compensation X I 00 (C20) . . . 5-9
15. CH 2 Gain (R221) ......................................... 5-9
16. CH 3 MF/LF Compensation ( C l34) ........... 5-9
17. CH 3 Gain (R231) ......................................... 5-9
18. CH 4 MF/LF Compensation (Cl 54) ........... 5-9
19. CH 4 Gain (R241) ......................................... 5-9
20. Delay-line HF Compensation
(R272, R273, R275, C274, C273) ........... 5-10
21. CH 3 HF Compensation ( C l38) ...............
22. CH 4 HF Compensation ( C l58) ...............
23. CH 1 And CH 2 Bandwidth C h e c k .........
24. CH 3 And CH 4 Bandwidth C h e c k .........
HORIZONTAL
1. Horizontal XI Gain (Timing) (R 826)......... 5-12
2. Horizontal X I 0 Gain (Timing) (R 825)___
3. Readout Horizontal Gain (R823) And
MAG Registration (R809)
4. A 0.5 p.s Timing (C314) ............................ 5-13
5. B 0.5 (is Timing (C329) ............................
6. 2-5 ns Timing (C807, C814) ...................
7. X Gain (R827) .............................................
MEASUREMENT BANDWIDTH AND SELF
CHARACTERIZATION
1. Volts Cal (R920) ......................................... 5-14
2. B Trigger Bandwidth (R455) .....................
3. Self C haracterization..................................
5-7
5-8
5-8
5-8
5-8
5-8
5-9
5-9
5-10
5-10
5-10
5-11
5-12
.......................... 5-12
5-13
5-13
5-13
5-14
5-14
5-3