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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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Perfect source for service manuals: fast and professional transaction; high quality, perfect readable and largely scaleable PDF; complete schemes, diagrams and spare part list. Tnx a lot, cu again!!!!
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I got your link from a friend and I must say that I am really satisfied with your service. Specially this B&O manual I didn't find anywhere on the web... but you could deliver it :-) . You deliver very fast and the copy is of good quality. So your webpage is bookmarked. Thanks
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This was the Sony CCU-500A Service manual I was looking for.
The price was reasonable.
The permission to download was quck.
I will use Owner-Manual.com for all my manual needs.
;
Excellent printing quality.
A complete and very usefull service manual with all details.
GREAT SERVICE AT VERY LOW PRICE!
A+++++++++++++++++++++++++
GRUNDIG Service
Chassis LE < 37"
DDRAM - LW7.190
FSVREF +2.5V_DDR
FSADDR[0..12]
C802
FSADDR[0..12]
C809
FSADDR0 FSADDR1 FSADDR2 FSADDR3 FSADDR4 FSADDR5 FSADDR6 FSADDR7 FSADDR8 FSADDR9 FSADDR10 FSADDR11 FSADDR12 C803 C804
29 30 31 32 35 36 37 38 39 40 28 41 42
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 / AP A11 A12 C810 /CLK
C808
DDR RAM
DQ0 NC DQ1 NC DQ2 NC DQ3 NC NC NC NC DQ4 NC DQ5 NC DQ6 NC DQ7 DQS DM NC NC NC NC NC NC NC
2 4 5 7 8 10 11 13 16 20 54 56 57 59 60 62 63 65 51 47 53 50 43 25 19 17 14
U801 256Mb _ 16bit
FSDATA[0..31] FSDATA0 FSDATA1 FSDATA2 FSDATA3 FSDATA4 FSDATA5 FSDATA6 FSDATA7
FSDATA[0..31]
C805 C806
C807
FSDQS0
FSDQM0
FSCLKFSCLK+
FSCLKFSCLK+
FSCKE /FSCS0 /FSRAS /FSCAS /FSWE FSBKSEL1 FSBKSEL0
FSCKE /FSCS0 /FSRAS /FSCAS /FSWE FSBKSEL1 FSBKSEL0
27 26
BA1 BA0
34 1 VSS VDD 48 18 VSS VDD 66 33 VSS VDD 49 VREF
44 24 23 22 21
CKE
6 3 C811 VSSQ VDDQ 12 9 VSSQ VDDQ 52 15 C812 VSSQ VDDQ 58 55 VSSQ VDDQ 64 61 C813 VSSQ VDDQ
46 45
CLK
FSDATA8 FSDATA9 FSDATA10 FSDATA11 FSDATA12 FSDATA13 FSDATA14 FSDATA15
FSDQS1 FSDQM1
/CS /RAS /CAS /WE
8532
FSVREF +2.5V_DDR
FSADDR0 FSADDR1 FSADDR2 FSADDR3 FSADDR4 FSADDR5 FSADDR6 FSADDR7 FSADDR8 FSADDR9 FSADDR10 FSADDR11 FSADDR12
29 30 31 32 35 36 37 38 39 40 28 41 42
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 / AP A11 A12 /CLK CLK
DDR RAM
DQ0 NC DQ1 NC DQ2 NC DQ3 NC NC NC NC DQ4 NC DQ5 NC DQ6 NC DQ7 DQS DM NC NC NC NC NC NC NC
2 4 5 7 8 10 11 13 16 20 54 56 57 59 60 62 63 65 51 47 53 50 43 25 19 17 14
U802 256Mb _ 16bit
FSDQS2
FSDATA16 FSDATA17 FSDATA18 FSDATA19 FSDATA20 FSDATA21 FSDATA22 FSDATA23
C816 FSVREF FSVREF C818 100N10N FSDQS0 FSDQS1 FSDQS2 FSDQS3 FSDQM0 FSDQM1 FSDQM2 FSDQM3 C817
FSDQM2
FSCLKFSCLK+
46 45
FSDATA24 FSDATA25 FSDATA26 FSDATA27 FSDATA28 FSDATA29 FSDATA30 FSDATA31
FSDQS3 FSDQM3
FSCKE /FSCS0 /FSRAS /FSCAS /FSWE FSBKSEL1 FSBKSEL0
44 24 23 22 21 27 26
CKE /CS /RAS /CAS /WE BA1 BA0
10K
R803 10K
FSCLK-
R848 280R
FSCLK+
R849 280R
FSDQS[0..3]
FSDQS[0..3] FSDQS0 FSDQS1 FSDQS2 FSDQS3
C800
C801
+2.5V_DDR CAP22U50V C814 CAP22U50V
FSDQM[0..3]
FSDQM[0..3] FSDQM0 FSDQM1 FSDQM2 FSDQM3
C815 10N 10N 100N10N 100N100N100N100N10N 100N10N 100N10N 10N
2 -
CAP22U50V
+2.5V_DDR R802
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