Adjustments - Yamaha GX-505 Service Manual

GX-505/GX-505VCD

ADJUSTMENTS

1. Before adjustment
Since head magnetization, dust accumulations, etc.
are likely to introduce error in the various character-
istics, it is very important that the heads are properly
demagnetized and cleaned.
Make adjustments of mechanical system, playback
system and recording system in that order.
Except for azimuth adjustment, adjust in the forward
direction.
Adjust using the TAPE TEST MODE (shown on page 16).
2. Instruments required
Audio frequency oscillator
ACVM or dual channel (ACVM)
DCVM
Wow/flutter meter
Oscilloscope
Frequency counter
Torque meter
TW-2111A (TX911580) ... Take up/back tension (FWD)
TW-2121A (TX911570) .... Take up/back tension (RVS)
CT-160L (TX911120) .................................. FF/REW
Test point
REC LEVEL ADJ.
( Lch )
REC LEVEL ADJ.
( Rch )
TAPE SPEED ADJ.
PB LEVEL ADJ.
( Lch )
PB LEVEL ADJ.
( Rch )
21
(DECK SECTION ONLY)
VR7
BIAS ADJ. ( Lch )
3. Test tape required
MTT-111N (TX911650) ........................... Normal speed
MTT-114N (TX911680) ................................ Azimuth
MTT-212N (TX911660) ...................... Playback level
MTT-256 (TX911300) ................ Playback frequency
MTT-356 (TX911310) ................ Playback frequency
Reference tape
I
Type /Normal (LH) .......... TDK AC225 (VU167200)
Type II /High (CrO
VR6
VR5
VR4
VR1
VR3
VR2
BIAS ADJ. ( Rch )
response (Normal)
response (CrO
) ......... TDK AC514 (VU167300)
2
)
2