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- Article: 17202 of rec.radio.shortwave
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- From: schuster@panix.com (Michael Schuster)
- Newsgroups: rec.radio.shortwave
- Subject: ICF-2010 adjustment revisited
- Message-ID: <C0n3JL.6J8@panix.com>
- Date: 10 Jan 93 13:16:33 GMT
- Organization: Panix Public Access Internet & Unix, NYC
- Lines: 104
-
-
- The following is re-posted from the Fidonet shortwave echo:
-
-
-
- 01/05/93 15:08:00
- From: GREG HORODECK
- To: BILL OXNER
- Subj: SONY 2010 FREQUENCY ADJUSTMENT
- I have a Service Manual for the Sony ICF-2010 and the alignment
- procedure forwarded by you from Genie is partially correct and
- I am amazed how the original author stumbled into it just by
- looking at the radio. Following is the instructions taken from
- the manual, which leave something to be desired, since pictures
- of the actual circuit board are part of the procedure and are
- important for identifying the adjustment points.
-
-
-
- Sync Adjustment
-
- Note: Frequency setting may alter when adjusted with shield
- plate (K) removed from sync board.
-
-
- Setup:
-
- Band: AM
- Mode: as directed
- AM RF GAIN Control: as adequate
- Frequency: as directed
- MANUAL TUNE MODE: SLOW
- SYNC switch: as directed
-
- Remove shield plate (K) and connect a test lead to pin 6
- (varicap voltage) for VTVM and frequency counter and
- reinstall shield plate (K).
-
- (There is a picture of a PC board trace with arrows where to
- attach the VTVM, Frequency counter, and Oscilliscope which
- defy any way of being described here. There are three
- adjusting points; CT601 (a variable cap) which is located
- through a small hole in the shielded SYNC unit itself, VT1 (a
- pot) which is located directly next to the shielded SYNC unit
- on the right, and VT2 a pot) which is on the left of the
- shielded SYNC unit near the corner of the printed circuit
- board.)
-
-
- Procedure:
-
- 1. Correctly and just tune in the set to a known, stable and
- strong AM station in NARROW and SYNC MODE off modes.
-
- 2. Set mode to USB.
-
- 3. Adjust VT1 for a 1.5V DC VTVM reading.
-
- 4. Adjust CT601 for a zero-beat note and waveform. (There is
- a picture of the proper and improper oscilliscope waveforms.)
-
- 5. Turn SYNC switch on and, adjust VT2 and set it to the
- point at which SYNC LOWER indicator just turns off to SYNC
- UPPER indication.
- Slowly turn VT2 back to the point at which SYNC UPPER
- indicator just turns off to SYNC LOWER indication, and leave
- VT2 as is.
-
- 6. Turn MANUAL TUNING knob to obtain a frequency indication
- just 100 Hz above the carrier of the station being received.
- (only one advancement in the final digit). Now, the SYNC
- UPPER indicator should light.
-
- 7. Frequency counter should read 3.640 MHz + or - 100 Hz.
-
-
- Refer to the original message from Gary Pupurs on Genie as
- forwarded to this echo by Bill Oxner for a description on how to
- open, precautions to take, and how to identify the SYNC unit.
- Since my display is spot on, I did not open up the radio to
- verify the colors of the pots.
-
- The service manual is quite comprehensive and includes the owners
- manual instructions, disassembly instructions, adjustments and
- alignment procedures, voltage testpoint tables, sample waveform
- patterns, mounting diagram (ghost of PC board and components),
- schematic diagram, and parts list. It can be ordered by calling
- 816/891-7550 and going through the automated voices to
- publications. Cost was around $10 when I got mine three years
- and they do charge $3 for shipping and take plastic.
-
- As Gary Pupurs warned, fooling around without a Service Manual is
- not for the faint hearted and a trip to the Sony Service Repair
- Center will most certainly be more costly than the Manual. I
- order a Service Manual as soon as I acquire any consumer electric
- item and they have certainly paid off.
-
- Greg
- ---
- * Origin: The Emporium BBS HST/V32/V42 708-551-9275 (1:115/551)
- --
- _______________________________Mike Schuster________________________________
- NY Pub. Access UNIX/Internet: schuster@panix.com | 70346.1745@CompuServe.COM
- The Portal (R) System: schuster@shell.portal.com | MCI Mail,GEnie: MSCHUSTER
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- Copied from the QRZ! Windows Ham Radio CDROM
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