This is the 7 pages manual for Akai GX 635 DB Schematic.
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svscom 9c BONE:
VR2 50KB VRI 50KB
10. TAPE SPEED ADJUSTMENT
(Refer to Fig. 16)
Set the Tape Speed Switch to 7-1/2 ips and playback
the 1,000 HZ, 7-1/2 Test tape.
Connect a frequency counter to LINE OUT and
adjust VR2 SOkB until the counter reads 1,000 Hz
Next, set the Tape Speed Switch to 3-3/4 ips and
adjust VRl 50 kB until the frequency counter reads
500 Hz i0.5%.