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Very good manual, at a very good price. Received in a timely manner
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Only thу cover has poor quality, internal material has excellent quality - exactly what I needed
Thanks!
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Had everything I needed. Onyly took a few hours after paid for by PayPal. The copy was very readable.
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Hi
First, thank you very much for the fast delivery.
I'm really satisfied with your manual. I could find everything, I needed.
I appreciate your service.
Regards from Germany PB
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Everything you need: schematic, circuit explanation, operating/testing instructions. Awesome.
TAPE ADJUSTMENT & CHECK TABLE
HEADPHONE BOARD - COMPONENT LAYOUT
HEADPHONE BOARD - CHIP LAYOUT
TEST CASSETTE
RECORDER MODE
MEASURE ON
ADJUST READ ON with to
ADJUST MOTOR SPEED
NORMAL SPEED SBC420 3150Hz PLAY B PLAY A 1 or 2 frequency counter 3620 check 3150Hz +/- 0.5% 3150Hz -0.8/+1.8%
LEFT RIGHT
CHECK WOW & FLUTTER
This assembly drawing shows a summary of all possible versions. For components used in a specific version see schematic diagram and respective parts list.
This assembly drawing shows a summary of all possible versions. For components used in a specific version see schematic diagram and respective parts list.
DECK A & B
SBC420 3150Hz
PLAY
1
or
2
W&F-meter
check
<0.4 % DIN
LEFT RIGHT
ADJUST AZIMUTH
DECK A & B SBC420 10kHz PLAY FWD PLAY REV # 1 or 2 mV-meter left hand screw right hand screw max. output level & left=right
LEFT RIGHT
CHECK PLAYBACK FREQUENCY RESPONSE
5852
3139 113 3447 pt2 dd wk0119
3139 113 3447 pt2 dd wk0119
DECK A & B
SBC420
PLAY
1
or
2
mV-meter
check
limits see fig.1
LEFT RIGHT
ADJUST BIAS CURRENT
HEADPHONE BOARD - CIRCUIT DIAGRAM
DECK B
1850 C1 1851 B3 1890 A3 1891 C3 1892 C3 2850 A2 2851 A3 2852 A2 2853 A2 2854 C3 5850 B1 5851 A2 5852 B2 9550 A2
SBC419A^ RECORD SBC420
5
or
6 mV-meter
3773 check
995mV 750mV +/- 1.5dB
LEFT RIGHT
CHECK OVERALL FREQUENCY RESPONSE AND DISTORTION
Inject 3mV signals 100Hz, 250Hz, 1kHz, 10kHz, 12.5kHz via 3 or 4 RECORDED CASSETTE 1 or 2 SBC419A^ or SBC420
1
# : Provision ## : Provision for ESD
2
# 9550 2850 22n 5851 2u2 HP 2852 22n 2853 100n
3
RECORD B
Note : Some values may varies, see respective parts list for correct value.
2851 22n
PLAY B
mV-meter
check
limits see fig. 2 *
A
A
1890 1 RT-01T
LEFT RIGHT RECORD B
Inject 1kHz 8.85mV via 3 or 4
SBC419A^ or SBC420 RECORDED CASSETTE
9 7 8
PLAY B
1
or
2
THD-meter
check
<3% *
LEFT RIGHT
1 2 3 1851 TC38
B
5850 2u2 2u2
4 5 6
B
SBC419A^ : 4822 397 30069 SBC420 : 4822 397 30071
# For Auto-reverse version only * If high frequencies are not within limits, decrease bias and re-measure. If distortion is too high, increase bias and re-meaure ^ Not applicable for Ferro version
level(dB)
TO AF9
1850
HP_DET
1 2 3 4
level(dB)
HP
C
HP_RIGHT HP_GND HP_LEFT
C
##1891 ##2854 RT-01T 1 FE-BT-VK-N HP
3139 118 54300...for 89620...3447 pt2 dd wk0119
8dB
6dB
8dB
8dB 10dB (HSD)
6dB
8dB 10dB (HSD)
##1892 1 RT-01T
470n
80
250 figure. 1
4k
12.5k
f(Hz)
100
250 figure. 2
4k
10k
f(Hz)
1
2
3
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