Fostex CR200 Service Manual page 12

CR200
4. ADJUSTING PROCEDURES
4-1. ADJUSTING PROCEDURES
Even if nothing is wrong with the pickup section and hardware components in the circuits, due to the misalignment of
various adjustments, there is a possibility that the CR200 does not work properly or at all. According to the following
procedures, make adjustments correctly.
Test equipment and adjusting tools
• Dual trace oscilloscope, 100MHz or higher bandwidth
• Sinewave signal generator
• Test disk: TCD-785 (Almedio) and STD-R03 (Pioneer)
• Low pass filter
15k½ + 0.001µF x 2 pcs.
39k½ + 0.001µF x 1 pc.
• High pass filter
3.9k½ + 180pF x 1 pc.
• Resistor
100k½
• Hex wrench: 1.27mm diagonal
• Regular tools such as a pair of tweezers, cutter, long-nose pliers and minus screw driver
• Ceramic screw driver. Vessel 9000 series are recommended.
• Digital multimeter (measuring voltage: less than 1mV)
Table of adjusting item / test point / pot
Adjustment 1
No.
1 Playback power adjustment
2 Coarse focus offset adjustment
3 Coarse skew adjustment
4 Coarse grating adjustment
5 DPP (tracking offset) adjustment
6 Fine focus offset adjustment
7 Fine skew adjustment
8 Grating readjustment
12
Item
CN104 Pin-7 (PWAJT)
CN204 Pin-1 (RF)
CN204 Pin-1 (RF)
CN104 Pin-3 (TE)
CN104 Pin-3 (TE)
CN204 Pin-1 (RF)
CN204 Pin-1 (RF)
CN104 Pin-3 (TE)
Test Point
VR103 (PB. PW)
VR105 (FE. OFS)
Radial adjustment screw
Tangential adjusting screw
Grating adjustment screw
VR112 (TE. OFS)
VR105 (FE. OFS)
Radial adjustment screw
Tangential adjusting screw
Grating adjustment screw
Pot