Scully 280B Series - Page 5

iv
Model 280B
CONTENTS (Continued)
Page
SECTION 6. THEORY OF OPERATION (Continued) . ........... . ....... 6-1
6.3 PLAY MODE ........................................ , 6-1
6.4 SYNC MODE ........................................ , 6-1
6.5 SQUELCH CIRCUIT
.......................... . ...... " 6-1
6.6 TAPE TRANSPORT ASSEMBLY. " ... ... ............... , 6-1
6.7 CONST ANT
TENSION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-1
6.8 TRANSPORT LOGIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-1
SECTION 7. MAINTENANCE......................... . ............ 7-1
7.1 MECHANICAL ADJUSTMENT
.......................... .
7-1
7.2 BRAKE ADJUSTMENT
......................... . ... . .. .
7-1
7.3 Tape Head Assembly Adjustments ....................... . .
7-1
7.4
Motion Sense
Adjustment ....... .. ............ . ........ .
7-3
7.5
Tension Posts
.......... . ..... .. ..... . .... . ........... .
7-3
7.6
Pinch Roller Adjustment ........... . .... . .............. .
7-6
7.7
Constant Tension Adjustment ........................... .
7-8
7.8
ATL
Adjustments .......... ... ....................... .
7-9
7.9
CHECKOUT AND ALIGNMENT PROCEDURES ........ . . . . .
7-9
7.10
Test Equipment Required ..... ... .... .. ............... . . 7-10
7.11
Preliminary
Procedures ................................ . 7-10
7.12 Playback Alignment ........... . ........ . ........ . ..... .
7-10
7.13
Record Alignment
............. . ...................... . 7-12
7.14
Record Bias
Set .......................... . ........... . 7-12
7.15
Record Calibrate Alignment
............................. .
7-16
7.16
Record Equalization
................................... .
7-16
7.17
Erase
Alignment ............ . ............. . ........... .
7-16
7.18
Depth of Erase ....................................... .
7-16
7.19
Signal-to-Noise
Ratio ......................... . ........ .
7-16
7.20
Distortion .... . ................................... .. .
7-16
7.21
Flutter ............................................. . 7-17
SECTION 8. SCHEMATIC DIAGRAMS AND PARTS LIST .............. 8-1
8.1 GENERAL ........ " ....... . ........ . ... .. ....... .. 8-1