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The AKAI 1720 model reel to reel tape recorder described in this Manual is quite an old unit - circa late 1960's. As a consequence, the description of the mechanical details - and adjustments thereof - is quite critical. The manual does this quite well. The schematics are also well presented and have detailed PCB overlays. Probably the only negative is that some half-tone detail has been lost from the original manual as it has been scanned in simple B&W.
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Excellent printing quality.
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A+++++++++++++++++++++++++
5
6
7
8
I
IC101 (Pin 94) Is there a master clock (24.576 MHz)? Yes IC651 (Pin 12) LCK1 Is there abnormality at the parts and patterns in the path? Is there abnormality at the parts and patterns in the path?
Check the following points when the source is DVD-A. IC101 (Pin 79) SDTI Is there abnormality at the parts and patterns in the path?
A
No
No
Is there No a audio data (with Sch source)? Yes IC101 (Pin 80) CDTI
No Replace IC101.
Replace IC291 or IC101.
Is there a LR clock ? Yes IC101 (Pin 88) Is there a LR clock ? Yes IC651 (Pin 7)
No
No
Is there No a audio data (with Cch source)? Yes IC101 (Pin 81) BDTI
Is there abnormality at the parts and patterns in the path?
No Replace IC101.
B
Replace IC651 or IC101.
No
Is there abnormality at the parts and patterns in the path?
No
Is there No a audio data (with SBch source)? Yes
Is there abnormality at the parts and patterns in the path?
No Replace IC101.
Replace IC651 or IC101. BCK1 Is there abnormality at the parts and patterns in the path?
C
To Step 6
Is there a bit clock ? Yes IC101 (Pin 89)
No
No
Step 6: Audio Clock (2nd DSP from 1st DSP)
IC291 (Pin 4) MCLK
Replace IC651 or IC101.
Is there a master clock (24.576 MHz)? Yes IC291 (Pin 6)
No
Is there abnormality at the parts and patterns in the path?
No
Is there a bit clock ? Yes IC651 (Pin 4)
No
Is there abnormality at the parts and patterns in the path?
Replace IC291.
D
No
MCK2
Replace IC651 or IC101. FDT1 Is there abnormality at the parts and patterns in the path?
Is there a master clock (24.576 MHz)? Yes IC201 (Pin 73)
No
Is there abnormality at the parts and patterns in the path?
No
Is there a audio data ? Yes IC101 (Pin 78)
No
No
Replace IC291 or IC201.
Replace IC651 or IC101.
Is there a master clock (24.576 MHz)? Yes IC101 (Pin 86)
No
Is there abnormality at the parts and patterns in the path?
No
E
Is there a audio data ? Yes
No
Is there abnormality at the parts and patterns in the path?
Replace IC201. LCK2 Is there abnormality at the parts and patterns in the path?
No
Replace IC651 or IC101.
Is there a LR clock ? Yes
No
No
Failure in 1st DSP block, Go to Step 8.
F
J
VSX-2016AV-S
5 6 7 8
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