Yamaha K1020 Service Manual

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lation level ]TP6 ] LMaximum (VR107) lt-t tO oscitlation Set VRl 19 and 12O all I 1 output isI the way to the teft. I t ;;;;r.
OUT ,TAPE (REC at minimum), set lFi102 (R) i 13mV imize bias leak.
I I I BIAS ADJUST to maxi- I l, 1 mum and measure bias I i II leak at LINE OUT when I i I
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I llation level ]TP6 j jMaximum {VR1o7} 1L110 oscillation I ii I ] j Set VR119 and 12O all i I output is i I] ithe way to tle leltr I TalT1n ] _ _:t lBrAtL;k METaltinrF-n.ct.M. -RE--fwirr . s*r pprlo-_lriror tr-r ir-1., Gn lAdiust so as to minill
I OUT ITAPE 1(REC at minimum), set IFi102 (R) itgmV lmize bias leak. II , i A|AS ADJUST to maxi- I II mr- and...

. PLAYBACK FREOUENCY RESPONSE
NR THROUGH
. RECORDING FREOUENCY RESPONSE
NR THROUGH
METAL
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NORMAL . 3dB
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K-ro20
Fis. L
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. TEST POINTrL NE-i)UI N
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I LSr DATA TABLES
. LM6402G-494
O MODE VS OUTPUT
L..... Low levelH ..... High level- ..... Holding premde* ..... L changes when operation is ON.H changes at initial REC.
 ..... L changes when TAPE is selected.H changes when SOURCE is selected
Note
I
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CLOCK, Microcomputer (800 kHz)
I +5VI
LSE INPUT, Reel stand {Take-up}
PULSE INPUT, Reel stand (Supply)
KEY SCAN INPUT
Speed Control of Reel Motor 2
Speed Contol of Reel Motor 1
Assist Motor Control
Reel Motor Control
LINE MUTE OUTPUT...

ITIMING CHART
MOVEMENT MODE
KEY OPERATION
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REEL R
HI REEL F
ASIST R
ASIST F
II REEL
lz REEL 2
T1 : Reversing due to assist motor stop... About 14
msec
T2: Play operation time . . . About 300 msec
T3 : Delay of play + STOP . . . About 15 mesc
Ta: Reel motor running time before shifting out of the
previous mode . . . About 50 msec
STOP o---------c- REW -MECHANISMMOVEMENT
T5 : Operation time of STOP -+ REW. . . About 90 msec
T6 ; Delay before...

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o Main Circuit Board (3)
MASTERFADER
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T PR.INTED CIR,CUIT BOARD
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FROM: MAIN C. EOARD (I)
FROM :MAIN C. BOARD (I)
(Pottern side)
o Main Circuit Board (b)
REMOTECONTROL
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TO: POWER SUPPLY...

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