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Sharp PC-1360 General Maintenance

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Sharp PC-1360 (service manual cover)
The PC-1360 as pictured on the cover of Sharp's service manual.

Routine care of the Sharp PC-1360. The PC-1360 runs at 6 V from two CR2032 lithium cells and keeps its user memory on plug-in RAM cards, each with its own lithium cell, so maintenance is mostly about cells, cards and their connectors.[1][2] There is no mains voltage inside.

Cells

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PC-1360 cells (Sharp service manual)[1][2]
Item Detail
Cells Two CR-2032 lithium cells, 6.0 V DC
Life About 120 hours, based on 10 minutes of operation and 50 minutes of display per hour at 20 °C
Replace when below 5.2 V (2.6 V per cell)
RAM card (CE-212M) Replace its cell when the terminal voltage falls below 2.5 V

The PC-1360 manual's note on judging cell life names the PC-1350, apparently carried over from that model's manual; the 5.2 V and 2.5 V thresholds are the ones it gives.[2]

Sharp's PC-1350 manual adds a re-initialisation step with CALL and POKE commands after a cell change. The PC-1360 manual gives no such step, and the PC-1350's addresses should not be assumed to apply to the PC-1360.[3]

RAM cards

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  • The PC-1360 takes the CE-210M (2 KB), CE-211M (4 KB), CE-212M (8 KB), CE-2H16M (16 KB) and CE-2H32M (32 KB) in its two slots. The PC-1350's CE-201M and CE-202M cannot be used.[4][1]
  • A card can be copied from slot 1 to slot 2. Do this before working on a machine or a card whose contents matter.[1]
  • Sharp gives the CE-212M's consumption as about 25 µA at most.[2]
  • The memory board connects to the cards through a PWB card connector (part PGUMS1549CCZZ). Keep the card contacts clean.[5]

Connectors

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The 11-pin connector for the CE-126P printer and cassette interface is on the left side, and the 15-pin serial connector is on the right side.[6][1] The serial port works at CMOS levels (4 to 6 V), not RS-232 levels.[4] Keep the 15-pin connector cover (part GFTAA1287CCSB) fitted when nothing is connected.[5]

Sharp's service checks include a continuity test: the resistance between the slot-2 side static panel and the right upper edge of the panel surface must be below 5 Ω.[7] If the case has been apart, check it after reassembly.

Display and contrast

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The LCD connects to the main board through a rubber connector (part PGUMS1550CCZZ) and is held by LCD fixing tape.[5] The contrast is set by a 20 kΩ variable resistor.[8] If dots or lines are missing, clean and reseat the connector before suspecting the LCD.

Cleaning and handling

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  • Wipe the case with a soft, dry cloth.
  • Use an anti-static strap when the case is open; the logic is CMOS.[4]
  • Take the cells out for long storage, after copying or saving anything on the RAM cards.

Capacitors

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The main board has one 3.3 µF and three 1 µF polarised capacitors, which Sharp says must be fitted within the board outline.[8][5] See Sharp PC-1360 Capacitor Replacement Guide.

Preventive maintenance checklist

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  1. Copy or save the RAM card contents.
  2. Check the cells against 5.2 V and the card cell against 2.5 V.
  3. Clean the RAM card contacts and the 11-pin and 15-pin connectors.
  4. Run the built-in display and key tests; see Sharp PC-1360 Troubleshooting Guide.
  5. Check the contrast with fresh cells.
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References

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  1. ↑ 1.0 1.1 1.2 1.3 1.4 Sharp, Service Manual, Model PC-1360, section 3 (continued), printed page 2 (PDF page 2): 11-pin printer interface; RAM card slots; CR-2032 × 2; about 120 hours; copying from slot 1 to slot 2.
  2. ↑ 2.0 2.1 2.2 2.3 Sharp, Service Manual, Model PC-1360, section 6 "Power consumption", printed page 3 (PDF page 3).
  3. ↑ Sharp Corporation, Service Manual, PC-1350, September 1984, "Supplement & correction" (PDF page 36). Hosted as File:Sharp PC-1350 Service Manual.pdf.
  4. ↑ 4.0 4.1 4.2 Sharp Corporation, Service Manual, Model PC-1360, code 00ZPC1360SM/E, August 1986, sections 2 and 3, printed page 1 (PDF page 1): RAM cards; 8-bit CMOS CPU; serial I/O at CMOS levels. Hosted as File:Sharp PC-1360 Service Manual.pdf.
  5. ↑ 5.0 5.1 5.2 5.3 Sharp, Service Manual, Model PC-1360, section 13 "Parts list & guide" (PDF pages 18 to 19).
  6. ↑ Sharp, Service Manual, Model PC-1360, section 9 "Test program", printed page 9 (PDF page 9): 11-pin connector on the left side, 15-pin connector on the right side.
  7. ↑ Sharp, Service Manual, Model PC-1360, section 10 "Other test items", printed page 9 (PDF page 9).
  8. ↑ 8.0 8.1 Sharp, Service Manual, Model PC-1360, section 12 "Parts and signals position", printed pages 12 to 13 (PDF pages 12 to 13).


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