6.1.4 Fast Forward/Rewind Damping Solenoid Adjustment .............. 6-7
6.1.5 Swing Arm Adjustment ........................................... 6-8
6.1.6 Tape Lifter Mechanism ........................................... 6-8
6.1.7 Brakes .......................................................... 6-10
6.1.8 Reel Turntable Height ........................................... 6-11
6.1.9 Reel Tension Servo Adjustments ................................ 6-12
6.1.9.1 Upper and Lower Limit Adjustment of Reel Tension ....... 6-12
6.1.9.2 Preliminary Center Position and Gain Adjustments ........ 6-13
6.1.9.3 Tape Tension Check ...................................... 6-13
6.1.9.4 Reel Motor Tracking with Capstan ........................ 6-14
6.1.9.5 Fine Adjustment of Position and Gain ..................... 6-15
6.1.9.6 Reel Size Detector Adjustment ............................ 6-15
6.1.10 Capstan Servo Adjustments .................................... 6-16
6.1.10.1 Capstan Tachometer Adjustment ........................ 6-16
6.1.10.2 Adjustment of CAPSTAN CONTROL PCB Assembly ....... 6-17
6.1.10.3 Fast Wind Speed Adjustment ............................ 6-17
6.1.11 Adjustment of TRANSPORT CONTROL PCB Assembly .......... 6-19
6.1.12 Adjustment of MASTER CPU PCB Assembly .................... 6-19
6.1.13 VU Meter Calibration ........................................... 6-19
6.2 Audio Alignment
.................................................. 6-20
6.2.1 Reproduce Amp Alignment ...................................... 6-20
6.2.2 Sync Amp Alignment ............................................ 6-21
6.2.3 Bias Alignment .................................................. 6-21
6.2.4 Record Alignment ............................................... 6-22
6.2.5 Record Phase Compensation .................................... 6-23
6.2.6 Erase Current Adjustment ....................................... 6-24
6.2.7 Gain Structure .................................................. 6-24
Section 7 Specifications
7.1 Tape Transport
..................................................... 7-2
7.2 Electronics (Measured with AMPEX #456 Tape)
.............. 7-3
7.3 Physical
............................................................. 7-4
7.4 Accessories
......................................................... 7-5
Section 8 Printed Circuit Board Layouts and Parts Lists
8.1 PB-16KA REC & REPRO Amplifier P.C.B. Assembly
.......... 8-2
8.2 PB-15L Bias Control P.C.B. Assembly
........................... 8-5
8.3 PB-4PKA Reel Size Detect P.C.B. Assembly
.................... 8-6
8.4 PB-45MB Speed Calculate P.C.B. Assembly
.................... 8-7
8.5 PB-45R Hour Meter P.C.B. Assembly
........................... 8-8
8.6 PB-46A Capstan Photo Amplifier P.C.B. Assembly
............ 8-9
8.7 PB-45SB Reel Power TR P.C.B. Assembly
.................... 8-10
8.8 PB-45T Capstan Power TR P.C.B. Assembly
.................. 8-12
8.9 PB-45VA Capstan Control P.C.B. Assembly
................... 8-14
8.10 PB-47AB Transport Control P.C.B. Assembly
............... 8-17
MTR-90III Operation and Maintenance Manual
April 1992
Table of Contents
ix
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