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N O T ES (1)
s
H B H B (+ ) Pattern H H ! Others pattern
(2)
The voltage is the reference value measured with a tester (20 K ohms/V DC) when there are no signals.
An asterisk (*) indicates that the value was measured with a vacuum-tube voltmeter during recording.
4. Playback Level Adjustment
Settings:
• Test tape: TTA-Î61
• MODE switch: ST E R E O
• T A P E SEL E C T O R switch: LH
• Test point: TP1 |L*ch),TP2 (R-ch)
• Adjustment locations: S F R 5 ( L-ch), S F R 6 (R-ch)
Method:
Playback the test tape and adjust so that the output
is 580 tnV.
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CS-880H,HG,U,UC
CS-880H,HG,U,UC
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{ A IW A
c£> @ D S L C.B
C O N - 2
11. Dolby-NR Trap Coil Adjustment
Settings:
• Test point: TP1 (L-ch), TP2 (R-ch)
• Oolby-NR switch: ON
• Adjustment locations: L3 (L-ch), L4 (R-ch)
For others, proceed as for bias OSC frequency
adjustment.
Method:
Adjust L3.4 so that the bias leakage to the test point
(TP1.2) is brought to the maximum.
10. Bias Current Adjustment
Settings:
• Recording mode
• Test point: TP3 (L-ch), TP4 (R-ch)
• Adjustment location: S F R 7 (L-ch), S F R 8 (R-ch)
For others, proceed as for bias frequency adjustment.
Method:
Adjust SFR 7,8 so that the voltage at test point TP3.4
is 56 m V (560pA).
Ratings:
L H .................................................38 mV (380 #xA)
M E T A L ........................................ 82 mV 1820 uAI
+B pattern of bias OSC . circuit
I
Bias OSC Frequency Test Point
8. Bias Frequency Adjustment
Settings:
• Recording mode
• Test point: TP5
• OSC switch:
" point
• T A P E SE L E C T O R switch: CrO.
• Adjustment location: CP1
Method:
Adjust CP1 so that the frequency at test point TP5
is 61
t
0.5 kHz.
Check that the frequency changes when the OSC
switch position is chanqed.
6. A L C Balance Adjustment
Settings:
• Recording mode
• Input signal: M IC ,—50 dB, 400 Hz
• R EC O R D switch: A L C
• Test point: TP1 (L-ch), TP2 (R-ch)
• Adjustment location: SF R 4
Method:
Adjust S F R 4 so that the voltage becomes the same
for both left and right channels.
12. Recording Current Adjustment
Settings:
• Recording mode
• Input signal: L IN E IN, -13 dB. 4 kHz
• R EC O R D switch: M A N U A L
• T A PE SEL E C T O R switch: CrO,
• Test point: TP3 (L-ch), TP4 (R-ch)
• Adjustment location: S F R 9 (L-ch), S F R 10 (R-ch)
Method:
Rotate the R EC O R D volume and set where the
meter indicates +3 dB.
Attenuate the input signal by 25 dB to — 38 dB.
Adjust S F R 9 , 10 so that the test point (TP3,4)
voltage is made 1.4 mV (140/iA).
Next, connect the +B pattern of bias oscillation
circuit;
rec/pb.
the
input signal.
Finely adjust
SFR9.10 the test point (TP1.2) output voltages
are set to within ±0.5 d8 during rec/pb.
C ^ > Ê ÎR E C /P B C.B
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