TASCAM DA-P1
TEAC Professional Division


Welcome to this copy of
Matthew Heydman's DA-P1 Info Page.
As long as Matthew's page isn't updated, I'll keep this updated version here.
Note: there has been an update, but in layout only. So the additional info is still a reason to keep this page

|| Button Chart || Specs || Test Modes || Block Error Rate || Mechanical Test ||
|| Switch Test || Display Test || System Data Display Mode || Brick-walling || Level Knob Settings ||
Literature || Related Links ||


Button Combinations

Press the buttons when the deck is in condition to perform action.

Buttons Condition Action
REC+PAUSE Stopped Format a new tape/record lead-in.
MARGIN RESET+ID SELECT Any Set Auto ID sensitivity. Press MARGIN RESET to cycle through settings (-42, -52, -60, -62 dB). Press ID SELECT to set the new level.
RESET Any/ABS Mark autolocate point
STOP+PLAY Stopped Find autolocate mark and begin playback
STOP+PAUSE Stopped Find autolocate mark and pause there
STOP+REW Stopped/ABS Find last record-in mark (and stop there)
STOP+FF Stopped/ABS Find last record-out mark (and stop there)
REW+FF+STOP+POWER ON Off Enter diagnostic mode

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Specifications

I haven't decided how to present all this data yet. I'll probably use a 4 column table.

Meanwhile you can look at Jonathan Rozes' DA-P1 page

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Test Modes

The following information was obtained from the Tascam DA-P1 Service Manual...
To enter the test mode(s), hold the STOP, FFWD, and REW buttons down while turning the power on. If you want to cancel the test mode(s), just turn the unit off and back on.

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Block Error Rate Measurment Mode

Initially, the deck is in this mode. The indicator for this mode is a "br" appearing as the current program number. If you are in a different test mode, you can enter this mode by pressing MARGIN RESET.

Once you're in this mode, play a tape. The Block Error Rate is displayed in the tape counter section. With each press of MARGIN RESET, you cycle through the available head readings:

"AH" - Block Error Rate read by head A
"bH" - Block Error Rate read by head B
"Ab" - Block Error Rate read by both A and B heads
The numbers that comprise the Block Error Rate are defined as the count of "C1 errors occuring in 128 PCM data blocks per track", displayed as "the number of errors per 10000 blocks (near to 9984, the actual number of blocks occupied by 78 tracks)."

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Mechanical Test Mode

In order to perform any diagnostics in this mode, a test tape (part no. TY-7551) is required. I'm not sure if a regular DAT would work. If anyone experiments with this, I'd appreciate any info you could offer.

Load the test tape. When the tape transport stopped, press ID SELECT, and the indicator for this mode ("ntESt") will appear on the display. Press play, and if the mechanism is fully operational, the tape counter will read "PASS". If an error has been detected, one (or more) of the following messages will be presented on the display:

"Err01" - LMS4 didn't go LOW when STOP switched over to PLAY.
"Err02" - LMS1 didn't go HIGH when STOP switched over to PLAY.
"Err03" - Drum-ON signal transmitted, but no DFG pulse was detected.
"Err04" - DLOCK doesn't go HIGH whereas the drum "is in function".
"Err05" - Capstan-ON signal transmitted, but no CFG pulse was detected.
"Err06" - CRLOCK doesn't go HIGH whereas the capstan motor "is in function".
"Err07" - No supply reel pulse fed into U327-62 (FGS) whereas the tape is in motion.
"Err08" - No takeup reel pulse fed into U327-62 (FGT) whereas the tape is in motion.
"Err09" - No RF signal detected in play mode.
"Err10" - PLLLOCK doesn't go HIGH.
"Err11" - Not all of the RH2 to RH4 gone LOW.
"Err17" - See Err10.
"Err1r" - See Err11.

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Switch Test Mode

Make sure there is no tape loaded in the deck for this mode. To enter this mode, press LIGHT. "rd" will appear as the program number.

Pressing each possible button/switch on the unit will display the associated symbol (see table, below) for each button as it is pressed. After you've pressed or swithed every one, press LIGHT again. If everything operated normally, "PASS" will appear in the display. However, if a button was not pressed, you will see "er" followed by the symbol of the button which did not get pressed (or malfunctioned?).

Button/Switch Symbol
COUNTER MODE F5
RESET F2
MARGIN RESET F4
ID SELECT F3
PAUSE F6
REC F7
EJECT S2
STOP t1
PLAY t2
F FWD t6
REW t5
>>| (SKIP) t4
|<< (SKIP) t3
HOLD F8
Fs t8
INPUT t7

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LCD Display Test Mode

Pressing COUNTER RESET will cause all display units to turn off. Then, one at a time, each display section will illuminate in sequence. When the test is complete, each component of the disply will light up simultaneously. Pressing COUNTER RESET during this test will freeze the test at that point. Releasing the button resumes the test.

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System Data Display Test Mode

Press the COUNTER MODE button to enter this mode. The following info is displayed in sequence:


  _
      _
 |_| |
 

        _         _   _
       | |   |   | | |_
       |_|   | m |_|  _|
 
Version number
This example means version 1.05

  _
 |   |_
 |_  |_
 

        _   _
       | | | |
       |_| |_|
 
Input data category code1
can be 00 (analog in), 80 (CD),
C0 (DAT) or C1 (DAT-P)

  _
 |   |_
 |_  |_|
 

        _   _     _   _
       | | | |   | | | |
       |_| |_|   |_| |_|
 
Cbit data. Information coming from the digital input.

  _
 |_  |_|
  _|  _|
 

  _     _   _     _   _
 | |   | | | |   | | | |
 |_|   |_| |_|   |_| |_|
 
System data. Information recorded on tape and the status of the
Digital Copy Mode of the deck.

  _
 |_|  |
 |    |
 

  _
  _|     |  _     _   _
 |_      |                - -
 
Pack Item No. Information stored in the subcode area of the tape.


 |_   |_
 |_|  |_
 

  _         _     _
 |_    |_| |_|
 |_| H   | |_|   |_|
 
Power supply or battery voltage indication.
This example means 6.48 volt.


  _|  |_
 |_|  |_
 

  _     _   _
 |_    | |  _|    | |_|
 |_|   |_| |_     |   |
 
Date indication. Date of last modification
of the software. This example means (199)6-02-14.
(y-mm-dd)

1 - Experimenting, I found an other interesting value: 41, which is "PCM Encoding/decoding"

Cbit data:

These hexadecimal codes contain binary data.

Two most significant numbers:

bit 7 & 6; Sample frequency accuracy
76Function
00Normal accuracy mode - "0"
01Variable pitch shifted mode - "4"
10High accuracy mode - "8"

bit 5, 4, 3 & 2; Sampling frequency
5432Function
000048 kHz - "0"
000132 kHz - "4"
001044.1 kHz - "8"

bit 1 & 0; Fixed to 0

Examples:

hex  bin         description
00 - 0000 0000 - Normal accuracy mode; 48 kHz
04 - 0000 0100 - Normal accuracy mode; 32 kHz
08 - 0000 1000 - Normal accuracy mode; 44.1 kHz
40 - 0100 0000 - Variable pitch shifted mode; 48 kHz
44 - 0100 0100 - Variable pitch shifted mode; 32 kHz
48 - 0100 1000 - Variable pitch shifted mode; 44.1 kHz
80 - 1000 0000 - High accuracy mode; 48 kHz
84 - 1000 0100 - High accuracy mode; 32 kHz
88 - 1000 1000 - High accuracy mode; 44.1 kHz

Third Number:

Copy protection & pre-emphasis (x = don't care)
3210Function
000xPre-emphasis off
001x50/15 uS pre-emphasis1
xxx0Digital copy prohibited
xxx1Digital copy allowed

1 - This is not what the service manual says. It says "100x" is pre-emphasis.

Examples:

hex  bin   description
0 - 0000 - Pre-emphasis off; Digital copy prohibited
1 - 0001 - Pre-emphasis off; Digital copy allowed
2 - 0010 - 50/15 uS pre-emphasis; Digital copy prohibited
3 - 0011 - 50/15 uS pre-emphasis; Digital copy allowed

Least significant number:

Signal type: (x = don't care)
3210Function
0xxxPlul Lock1
1xxxPlul Unlock1
x0xxParity good
x1xxParity not good
xx0xConsumer use
xx1xBroadcasting use
xxx0Normal audio mode
xxx1Non audio mode

1 - PLL lock/unlock. Unlock usually means no incoming digital signal is present.

Examples:
0 - 0000 - Locked; Parity OK; Consumer use; Normal audio.
1 - 0001 - Locked; Parity OK; Consumer use; Non audio use.
2 - 0010 - Locked; Parity OK; Broadcasting use; Normal audio.
3 - 0011 - Locked; Parity OK; Broadcasting use; Non audio use.
4-7 - 01xx - Locked; Parity not OK.
8-15 - 1xxx - Unlocked.
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System data

This is binary data (you should see only 0's and 1's). It shows data recorded on tape and some hardware configuration. "D806" seems to be an option to make the DA-P1 a consumer deck. (x = don't care)
first (left) digitsecond digitthird digitforth digitfifth (right) digitFunction
00xxxCopy Permitted
10xxxCopy Prohibited
11xxxSpecial 1
xx0xxNormal Track
xx1xxWide Track
xxx0xEmphasis Off
xxx1xEmphasis On
xxxx0SCMS Mode (D806 mounted on front PCB)
xxxx1Copy Free Mode (D806 not mounted on front PCB)

Pack Item data

This mode displays the organisation of the "Pack". The Pack is recorded on tape in the subcode region. A Pack consists of 8*8 bytes, and contains seven "Items". Each Item holds one value representing a data type. The date types are:
valueData type
0No information
1Program Time
2Absolute Time (ATIME)
3Running Time
4TOC
5Calendar (Date)
6Catalog Number
7ISRC
8Pro binary (for professional use)
9-Ereserved
-No data
FInvalid data (like no or blank tape)

The organisation of the Pack Items for several decks. The decks marked with * were added by me. Other data comes from the DA-P1 service manual:
Pack Item 1 to 7Decks
2 1 - - -   - -Tascam DA-P1, DA-30
2 2 3 8 -   - -Tascam DA-60
2 - - - -   - -Tascam DA-20
2 2 2 1 1   5 5Sony DTC 690, ZA5ES
3 3 3 3 3   8 8Sony PCM 7050
2 2 1 1 4   4 6Sony Test Tape TY-7551
2 2 5 5 2   2 2Sony TCD-D7 (*
2 2 2 2 1   1 1Sony DTC 790 (*
2 2 2 2 2   2 2JVC XD-Z507 (*

So there are seven Pack Items and seven Item data types (1-6 + 8). Sony and JVC typically uses all Pack Items to store copies of a few Item Data types.
An example: The Sony TCD-D7 stores five copies of the Absolute time on Pack Items 1, 2, 5, 6 and 7. The Date is stored twice in Items 3 and 4.

Binary to hexadecimal conversion table

(x = don't care)
bit 3bit 2bit 1bit 0Hexadecimal
00000
00011
00102
00113
01004
01015
01106
01117
10008
10019
1010a
1011b
1100c
1101d
1110e
1111f
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Brick-walling

Minimum setting for the level knob (combined with levels close to 0dB on the display) is 3 (3.25). Higher input levels (and lower knob settings) results in clipping of input stages.

The maximum input signal level is:

                   -34 dBu (~15 mV rms) at 0 dB (mic)
                   -14 dBu (~157 mV rms) at -20 dB (PAD 20dB)

This means that with sensitive microphones, you run into trouble if the sound pressure level is more than average. Even with the 20 dB pad. Together with a -10 dB switch on the microphones, the attentuation is about right for medium to loud concert sound levels.
The line level setting also switches off the phantom power :-(.

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Level knob settings

Relative attentuation with level knob settings:
10 0 dB
9- 0.6 dB
8- 4.0 dB
7- 8.3 dB
6-12.0 dB
5-14.5 dB
4-17.5 dB
3-23.2 dB
2-31.8 dB
1-47.3 dB

Disclaimer: The measurements are made with an almost pre-war tube dB/(m)V meter, so are not neccesary accurate. On this apparatus (a Lie Belin No. 12 T: EV25) 0dB equals 0.775 mV. So the dB's are actually dBu's.

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Literature

These books are a bit outdated, but still contain lots of data about digital audio in general and also include DAT.

  • The Art of Digital Audio - John Watkinson. Focal Press 1988. ISBN 0-240-51270-7
  • Digital Audio and Compact Disc Technology - Sony Service Centre (Europe). Heinemann Newnes 1988. ISBN 0-434-91868-7

The basis of this all.

  • Tascam DA-P1 Service manual. Tascam order number D0020000-0A.

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Related Links

Last updated: 2003-06-16, fjk